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A temperature pre-rectifier with continuous heat storage and release for waste heat recovery from periodic flue gas Heat Transf. Res. (IF 1.7) Pub Date : 2024-03-01 Hengyu Qu, Binfan Jiang, Xiangjun Liu, Dehong Xia
Flue gas from periodic furnaces with large temperature fluctuation is difficult to be recovered by regular heat exchangers. To recover that unstable waste heat, a Temperature Pre-Rectifier (TPR) with honeycombed structure is developed to smooth down the temperature fluctuation by continuous heat-storing and releasing. A three-dimensional model with unsteady flow and heat transfer is constructed to
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Study on the Influence of Multi-Frequency Noise on the Combustion Characteristics of Pool Fires in Ship Engine Rooms Heat Transf. Res. (IF 1.7) Pub Date : 2024-03-01 Zhilin Yuan, Liang Wang, Jiasheng Cao, Yunfeng Yan, Jiaqi Dong, Bingxia Liu, Shuaijun Wang
A large amount of low- and medium-frequency noise can be found in the engine room of a ship. However, during the development of a fire, vibrations of the air in the engine room at different frequencies can be caused by noise disturbances, and the flow field distribution in the flame zone will be changed, which will affect the combustion characteristics of the pool fire. In this paper, a n-heptane pool
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Analysis of Thermal Performance in a Two-phase Thermosyphon loop based on Flow Visualization and an Image Processing Technique Heat Transf. Res. (IF 1.7) Pub Date : 2024-03-01 Avinash Jacob Balihar, Arnab Karmakar, Avinash Kumar, Smriti Minj, P L John Sangso
Thermal performance was analyzed based on flow visualization and an image processing technique in a two-phase thermosyphon loop (TPTL) with boiling water as the working fluid at low pressure. The bubble geometries, bubble frequency, and dynamic void fraction were measured using direct image analysis combined with the power spectrum and statistical analysis. At a heating rate of 400 W and a filling
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Investigation of the Effect of Dead State Temperature on the Performance of Boron Added Fuels and Different Fuels Used in an Internal Combustion Engine. Heat Transf. Res. (IF 1.7) Pub Date : 2024-03-01 Irfan UÇKAN, Ahmet Yakın, Rasim Behçet
This study aimed to investigate the exergy variations of five different fuels developed for internal combustion engines. Two of these fuels were newly developed boron-added fuels. In many previous studies, only one dead state temperature was considered for exergy calculations. However, it is important to note that the dead state temperature can vary. Therefore, the impact of changing the dead state
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PREDICTION OF PARAMETERS OF BOILER SUPERHEATER BASED ON TRANSFER LEARNING METHOD Heat Transf. Res. (IF 1.7) Pub Date : 2024-03-01 Shuiguang Tong, Qi Yang, Zheming Tong, Haidan Wang, Xin Chen
The superheater in the boiler is the key of equipment connecting high-temperature steam to the turbine for power generation. At present, the problems of large variable fluctuations, strong timing coupling and multi-power plant data utilization prevent the temperature, flow and pressure prediction of the boiler superheater. In this paper, a method for predicting the parameters of boiler superheater
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Experimental study on two-phase nonlinear oscillation behavior of miniaturized gravitational heat pipe Heat Transf. Res. (IF 1.7) Pub Date : 2024-02-01 Yu Fawen, Chaoyang Zhang, Tong Li, Yuhang Zhang, Wentao Zheng
An experimental study on oscillation behavior of vapor-liquid two-phase in aluminum ethanol miniaturized gravitational heat pipe with parallel rectangular channel is carried out. The nonlinear oscillation behavior and oscillation characteristics of two-phase in oscillation state are qualitatively analyzed. In addition, the nonlinear oscillation characteristic of the wall temperature is revealed. Furthermore
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THERMAL MANAGEMENT OF LITHIUM-ION BATTERY PACKS BY USING CORRUGATED CHANNELS WITH NANO-ENHANCED COOLING Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Fatih Selimefendigil, Aykut Can, Hakan Fehmi Oztop
In this study, a cooling system using corrugated cooling channels and Al2O3−Cu/water hybrid nanofluid is offered as the battery thermal management system (BTMS) for prismatic Li-ion batteries. A computational model built based on the finite element approach uses hybrid nanofluid at solid volume fractions ranging from 0 to 2% at various Reynolds numbers. The cold plates are corrugated and have a variety
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STUDY ON TWO-PHASE FLOW AND TEMPERATURE UNIFORMITY CHARACTERISTICS OF MICROCHANNEL HEAT PIPE Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Renpan Yin, Yaping Zhang, Haochen Jiang, Ruijia Zhang
In order to offset the local heat flux concentration phenomenon and ensure the steady performance of electronics, a test apparatus for evaluating the thermal performance of a microchannel heat pipe was constructed to investigate the thermal uniformity of the microchannel heat pipe under varying heat source placements. The experimental findings indicate that at a power of 25 W with the heat source positioned
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FLOW BOILING HEAT TRANSFER COEFFICIENT USED FOR THE DESIGN OF THE EVAPORATOR OF A REFRIGERATION MACHINE USING CO2 AS WORKING FLUID Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Nadim Karoune, Rabah Gomri
In this work, a comparative study of the heat transfer coefficient of carbon dioxide (CO2) in evaporation is presented. The main objective of the this work is to analyze and evaluate 1886 experimental points of the CO2 heat transfer coefficient with the help of two evaporation correlations (Fang et al., 2013, 2017); the correlation of Fang et al. (2017) gives the best results with a mean absolute deviation
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ANALYZING THE HEAT AND FLOW CHARACTERISTICS IN SPRAY COOLING BY USING AN OPTIMIZED RECTANGULAR FINNED HEAT SINK Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Altuğ Karabey, Kenan Yakut
Rapid advancements in technology constantly keep the need for thermal systems, which have high performance, on the agenda and direct the attention of researcher-engineers to the studies on improving the heat transfer. Spray cooling process depends on many parameters including nozzle diameter, surface area, surface geometry, critical heat flux, mass flow, gravity, spraying angle, and surface slope.
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CONVECTIVE HEAT TRANSFER INSIDE A ROTATING HELICAL PIPE FILLED WITH SATURATED POROUS MEDIA Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Krishan Sharma, P. Deepu, Subrata Kumar
In this paper, we study the hydrothermal characteristics of flow inside a rotating helical pipe filled with saturated homogeneous porous medium. The analysis is being carried out for the case of small curvature and torsion. Using the perturbation approach, velocity and temperature fields are solved for both uniform wall heat flux and uniform wall temperature boundary conditions. Perturbation expansion
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PREPARATION METHOD AND THERMAL PERFORMANCE OF A NEW ULTRA-THIN FLEXIBLE FLAT PLATE HEAT PIPE Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Xuancong Zhang, Jinwang Li, Qi Chen
Ultra-thin flat plate heat pipes must provide a degree of flexibility to meet foldable electronics heat dissipation requirements. In this paper, a new flexible ultra-thin flat plate heat pipe with a thickness of 0.75 mm has been designed and fabricated. Compared with the traditional flexible ultra-thin flat heat pipes, the innovation lies in the flexible insulation section formed by epoxy resin pouring
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INFLUENCE OF TEMPERATURE GRADIENTS AND FLUID VIBRATIONS ON THE THERMOCAPILLARY DROPLET BEHAVIOR IN A ROTATING CYLINDER Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Yousuf Alhendal
In this paper, a computational fluid dynamics (CFD) approach is used to analyze and numerically present the droplet movement in both stagnant and vibrated liquid in a rotating cylinder. The Ansys Fluent commercial software package is used to solve the governing continuum conservation equations for two-phase flow. The volume of fluid (VOF) method is used to track the liquid/liquid interface. The inherent
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THE EFFECT OF CORRUGATION ON HEAT TRANSFER AND PRESSURE DROP IN A SOLAR AIR HEATER: A NUMERICAL INVESTIGATION Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Aneeq Raheem, Waseem Siddique, Sohaib A. Warraich, Khalid Waheed, Inam ul Haq, Muhammad Tabish Raheem, Muhammad Muneeb Yaseen
Solar is a green source of energy. The foremost objective is the efficient heating of air by enhancing the thermal efficiency of solar air heaters. Even a small enhancement in the efficiency will increase its life, power output and reduce its operating cost. In the current study, a double-pass, trapezoidal cross-sectioned channel with four different arrangements of corrugations at the bottom and trailing
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INVESTIGATION OF THE EFFECT OF USING DIFFERENT NANOFLUIDS ON THE PERFORMANCE OF THE ORGANIC RANKINE CYCLE Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Meltem Arısu, Tayfun Menlik
Energy consumption worldwide continues to increase due to population growth, rural-to-urban migration, technological advancements, and the rising use of specialized products that make life easier. As a result, there is a growing demand for renewable energy sources in energy supply, and technological research is being conducted to address energy losses and improve existing systems for more efficient
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ENTROPY GENERATION AND HEAT TRANSFER PERFORMANCE OF CYLINDRICAL TUBE HEAT EXCHANGER WITH PERFORATED CONICAL RINGS: A NUMERICAL STUDY Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Sakthivel Anitha, Tiju Thomas
Here we report a numerical analysis of a cylindrical tube heat exchanger equipped with perforated conical rings. This study reports entropy generation, energy consumption, and thermal evaluation of heat exchanger by using ternary hybrid nanofluid (as a coolant). The nanomaterials such as Al2O3, Cu, and MWCNT (multi-walled carbon nanotubes) with various volume fractions (φ = 0−0.5%) are used. The mean
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MOLECULAR DYNAMICS STUDY OF THE THERMAL TRANSPORT PROPERTIES IN THE GRAPHENE/C3N MULTILAYER IN-PLANE HETEROSTRUCTURES Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Junjie Zhu, Jifen Wang, Xinyi Liu, Kuan Zhao
We investigated the interfacial thermal conductance of the graphene/C3N multilayer in-plane heterostructures by nonequilibrium molecular dynamics simulation. The results showed that the interfacial thermal conductance is 12.97 GW/(m2·K) and the thermal rectification ratio is 23.80% in the bilayer of the multilayer parallel stacked heterostructure. The interfacial thermal conductance and the thermal
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FLOW BOILING CRITICAL HEAT FLUX IN A SMALL TUBE FOR FC-72 Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Yuki Otsuki, Makoto Shibahara, Qiusheng Liu, Sutopo Purwono Fitri
Flow boiling of FC-72 in a small tube was investigated experimentally. The tube with an inner diameter of 1.8 mm and a length of 129 mm was made from SUS304 stainless steel. The effect of flow velocity and subcooling on critical heat flux (CHF) was measured in this experiment. The flow velocity u was varied from 0.33 to 4.26 m/s, and the inlet subcooling degree was varied from 25 to 36 K. The heat
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EXPERIMENTAL INVESTIGATION ON THERMAL PERFORMANCE OF ULTRA-THIN FLATTENED HEAT PIPE WITH MIDDLE HEATING FOR ELECTRONICS COOLING Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Tengqing Liu, Xuehao He, Yaokang Zhang, Shuangfeng Wang
For cooling the electronics in limited space, this study proposes ultra-thin flattened heat pipes (UTFHP) with two working modes, i.e., a short UTFHP with single-end heating and single-end cooling (SHSC) and a long UTFHP with middle heating and dual-end cooling (MHDC). The length of the short UTFHP is half that of the long UTFHP. The effects of input heat load and cooling temperature on the thermal
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PASSIVE THERMAL MANAGEMENT OF PHOTOVOLTAIC MODULES USING LATENT HEAT STORAGE SYSTEM WITH METALLIC MESH LAYERS AND MULTI-METAL SPINEL OXIDE NANOPARTICLES Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Emine Yağız Gürbüz, Haytem Moussaoui, Barış Kusun, Azim Doğuş Tuncer
Passive thermal management of photovoltaic (PV) panels is an effective and low-cost method for reducing the surface temperature and improving the power output of these systems. In the current study, it is aimed to upgrade the efficiency of a PV system using a latent heat storage system with metallic mesh layers and multi-metal spinel oxide nanoparticles. The experimental part of this work contains
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STUDY OF FORCED ACOUSTIC OSCILLATIONS INFLUENCE ON METHANE OXIDATION PROCESS IN OXYGEN-CONTAINING FLOW OF HYDROGEN COMBUSTION PRODUCTS Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Anastasiya I. Krikunova, K. Y. Arefyev, I. M. Grishin, M. A. Abramov, V. V. Ligostaev, E. V. Slivinskii, V. V. Krivets
The article presents the results of a computational and experimental study of the acoustic intensification of methane oxidation processes in high-enthalpy oxygen-containing flow of hydrogen combustion products. The studies were conducted by using a duct with constant cross section and finite length. Initial specific enthalpy of the oxygen-containing flow is varied from 1600 kJ/kg to 2400 kJ/kg. The
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NATURAL CONVECTION OF NON-NEWTONIAN DILATANT FLUID IN THE GAP BETWEEN AN OUTER CYLINDER AND INNER CYLINDER WITH GROOVES Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Oussama Benhizia, Mohamed Bouzit
This paper reports a numerical study of the laminar free convection of dilatant fluid between two concentric cylinders. The simulations have been performed for the two-dimensional steady state and the ANSYS CFX 16.2 was used as theoretical-computational approach to achieve detailed and realistic results. The finite volume method was used for that objective. The governing problem parameters are taken
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PERFORMANCE AND STRUCTURE OPTIMIZATION OF TORSIONAL FLOW HEAT EXCHANGER WITH ORTHOGONAL DROP-SHAPED TUBE Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Xin Gu, Yiwen Zhu, Hao Sun, Xin Liu, Yongqing Wang
As a novel adaptation of shell-and-tube heat exchanger, the torsional flow heat exchanger holds promising application prospects. Drop-shaped tubes are employed to enhance fluid flow velocity, distribution, and overall heat transfer performance. This study presents a torsional flow heat exchanger featuring orthogonal drop-shaped tubes on the shell side, aiming to combine the advantages of both designs
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IMPROVING THERMAL AND ELECTRICITY GENERATION PERFORMANCE OF PHOTOVOLTAIC/THERMAL (PV/T) SYSTEMS USING HYBRID NANOFLUID Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Ettahır El Hadı O. Swese, Adnan Sözen, Rezvan Rezaeızadeh, Aybaba Hançerlioğulları, İpek Aytaç, Halil İbrahim Variyenli, Mutlu Tarık Çakır
Solar energy is a safe and clean source of energy, available on the Earth throughout the year. A photovoltaic/thermal (PV/T) system is a device designed to take solar energy and convert it into electrical/thermal energy. Photovoltaic/ thermal systems can also be useful to produce hot fluid (usually water) along with the generation of electrical energy. In addition, the electric generating performance
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PARAMETRIC CFD STUDY OF SOLAR AIR HEATER HAVING ALTERNATED UPPER AND BOTTOM ABSORBER PLATES IN TURBULENT FLOW Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Hassene Djemel, A. Ben Mabrouk, M. Hammami, Mounir Baccar
This work presents a computational fluid dynamics (CFD) investigation of a solar air heater (SAH) that features alternating upper and bottom absorber plates to evaluate its thermal behavior and turbulent flow characteristics. Generally, the SAH exhibits low heat transfer characteristics and poor thermal efficiency in turbulent flow. The use of alternating upper and bottom absorber plates facing the
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VALIDATING THE FIRST LAW OF THERMODYNAMICS FOR UNSTEADY FLOW IN A COMPRESSION WAVE USING MATHCAD Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Vladimir Ryndin, Amangeldy Karmanov, Akmaral Kinzhibekova, Rizagul Dyussova, Gulnara Abdullina
Classical thermodynamics traditionally overlooks the role of quantities dependent on spatial coordinates and time, especially in the context of unsteady flows. This research introduces the first law of thermodynamics (FLT) tailored for nonstationary flow, distinguishing itself with the inclusion of terms bearing partial derivatives of pressure, p(x, t), concerning coordinates and time (−ν(∂р/∂х)dx;
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FINITE ELEMENT ANALYSIS OF HEAT TRANSFER AND DEAN VORTICES OF RECTANGULAR CORRUGATED MICROCHANNEL Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Zhanshu He, Saifei Ding, Beibei Cui, Huang Shentu, Jinlong Yu, Xiaohang Wang, Xianghui Liu
In order to develop a rectangular corrugated microchannel (RCM) heat sink with high heat transfer and low pressure drop, a rectangular corrugated microchannel is designed and simulated, and then the effects of amplitude A, wavelength λ, and inlet flow velocity uin on heat transfer performance, Dean vortices, and pressure drop are investigated. Furthermore, A, λ, and uin are optimized according to the
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EXPERIMENTAL STUDY ON AN AUTOMOBILE AIR CONDITIONING SYSTEM WITH INTERNAL HEAT EXCHANGER USING THE REFRIGERANTS HFC134a AND HFO1234yf Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 H. M. Gurudatt, G.S.V.L. Narasimham, B. Sadashive Gowda
Despite being favorable to stratospheric ozone, hydrofluorocarbons (HFCs), a synthetic replacement to chlorofluorocarbons (CFCs), have a high global warming potential (GWP). Despite this, HFCs are still used in many applications, including air conditioning and refrigeration. The HFCs were included in the category of greenhouse gases under the Kyoto Protocol, which was negotiated in 1997 and entered
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A METHODOLOGY FOR THERMAL CHARACTERIZATION OF HIGH-POWER LIQUID-COOLED SERVERS Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Pardeep Shahi, Ali Heydari, Satyam Saini, Pratik Bansode, Uschas Chowdhury, Harold Miyamura, Himanshu Modi, Dereje Agonafer, Mohammad Tradat, Jeremy Rodriguez
Effective cooling is crucial for high-power liquid-cooled servers to ensure optimal performance and reliability of components. Thermal characterization is necessary to ensure that the cooling system functions as intended, is energy efficient, and minimizes downtime. In this study, a proposed methodology for thermal characterization of a high-power liquid-cooled server/TTV [server and TTVs (thermal
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THERMAL ANALYSIS OF BI-DIRECTIONAL FUNCTIONALLY GRADED PLATES SUBJECTED TO HEAT GENERATION Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Durmus Yarımpabuç, Mehmet Eker, Ramazan Yıldırım
The two-dimensional steady-state heat transfer problem is analyzed under the most general boundary conditions in a heterogeneous environment. It is assumed that the internal heat generation varies arbitrarily in two directions, while the thermal conductivity coefficient of the material is bi-directly (thickness−length) graded with the Mori−Tanaka model. The linear inhomogeneous partial differential
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INVESTIGATING THE IMPACT OF USING MAGNETIC-TYPE NANOFLUID ON THE THERMAL PERFORMANCE OF A SOLAR WATER COLLECTOR WITH HELICALLY COILED TUBE ABSORBER Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 İpek Aytaç, Azim Doğuş Tuncer, Halil İbrahim Variyenli, Ataollah Khanlari, Ebru Şatay
In recent years, solar water collectors are commonly preferred for supplying heated water to be utilized in various processes. In the present study, a solar water collector equipped with a helically coiled absorbing surface has been manufactured and experimented under various working conditions to determine its general behavior. The main goal of using a helically coiled absorber is enhancing energy
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OPTIMIZATION OF FINNED HEAT SINKS WITH ELECTROSPRAY COOLING: FULL FACTORIAL METHOD Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Abdüssamed Kabakuş, Kenan Yakut
In this study, the optimum heat sink geometry was determined by the full factorial method with electrospray cooling, which has started to find a place among the methods used for the removal of high heat flux in recent years. The experiments were carried out at 4.4 kV voltage, 0.2 mL/min flow rate, di= 0.61 mm nozzle diameter, and 20 mm nozzle-to-heat sink distance. Ethanol was used as the cooling fluid
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THERMAL ANALYSIS OF A PLATE HEAT EXCHANGER (PHE) FITTED WITH CARDING TOOL PATTERNS USING CFD MODELING Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Hassene Djemel, Sirine Chtourou, Mohamed Kaffel, Mounir Baccar
Inspired by the wool carding tools, a new plate heat exchanger (PHE) design was developed, tested, and analyzed numerically. The present research work used computational fluid dynamics (CFD) simulations to examine the impact of various parameters, such as the rib type (continuous and discrete), the arrangement type (rectangular, square, and triangular), and the geometrical parameters (transversal and
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EXPERIMENTAL INVESTIGATION OF HEAT TRANSFER AND PRESSURE DROP CHARACTERISTICS OF FERROFLUIDS IN THE PRESENCE OF MAGNETIC FIELD AND LAMINAR FLOW CONDITIONS Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Burak Muratçobanoğlu, Emre Mandev, Gökhan Ömeroğlu, Eyüphan Manay
In this study, the heat transfer performance with forced convection of two different water-based nanofluids was investigated by applying an alternating magnetic field in a minichannel. CoFe2O4−water and MnFe2O4−water nanofluids have been prepared at 0.5 vol.% and tested. The tests were carried out in a minichannel under laminar flow conditions in the Reynolds numbers range of 300−1700. Nusselt numbers
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EXPERIMENTAL AND NUMERICAL STUDY ON EFFECTS OF NEW-GENERATION FINNED HEAT EXCHANGER ON THERMAL PERFORMANCE OF THERMOELECTRIC COOLING SYSTEMS Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Burak Muratçobanoğlu, Emre Mandev, Gökhan Ömeroğlu, Fatih Akpınar, Erkan Öz, Faraz Afshari
In this study, an attempt has been made to increase the efficiency of the thermoelectric refrigerator by designinig a new-generation finned heat exchanger. Surface extension, which is one of the most applied passive heat transfer enhancement techniques, was applied for this finned heat exchanger. In this application, the heat absorbed from the cooling room is transferred to the external environment
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CHARACTERIZATION AND MODELING OF DENSITY AS A FUNCTION OF TEMPERATURE FOR PARAFFIN WAX PHASE CHANGE MATERIALS (PCMs) Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Jacob Lamotte-Dawaghreh, Joseph Herring, Rabin Bhandari, Akshay Lakshminarayana, Rohit Suthar, Pratik Bansode, Dereje Agonafer, Nestor Ramos, Nicolas Teufel, Thomas Silvers, Michael Wilson, Dan Eifert, Daniel Martorana
This paper presents a study on the characterization of density as a function of temperature for phase change materials (PCMs). More specifically, in this study we analyze organic alkane PCMs, often called paraffins. PCMs are materials that have the ability to absorb a substantial amount of heat during phase transition from solid to liquid, and therefore prove to be useful in thermal energy storage
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MICROSTRUCTURAL PECULIARITIES OF Al−Ni ALLOYS PREPARED BY HIGH-FREQUENCY INDUCTION FUSION Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 H. Bedboudi, Mohamed Yacine Debili, S. Mathieu, F. Layachi
This study investigated the effects of a high-frequency (HF) magnetic induction process and heat treatment on the composition of rapidly cooled Al−Ni alloys. The results showed that the Al3Ni and AlNi phases were present in all compositions, including Al−40 wt.% Ni, 50 wt.% Ni, and 60 wt.% Ni in both initial and treated states. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used
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STUDY OF FLUID MOTIONS AND THERMAL PERFORMANCE OF WATER AND ACETONE OSCILLATING HEAT PIPES USING NEUTRON IMAGING Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Il Yoon, Robert A. Winholtz, Hongbin Ma
Quantitative analysis of fluid motion in an oscillating heat pipe (OHP) is essential to better understand fluid flow and heat transfer mechanisms in an OHP. Two copper OHPs filled with water and acetone respectively were investigated by a neutron imaging technique to visualize the fluid motions in the OHP. Temperatures on the OHP surface were measured while neutron images were taken simultaneously
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THE EFFECT OF SURFACE TRIANGULAR ROUGHNESS INSPIRED BY NATURE WITH DIFFERENT ANGLES ON THE INTERACTION BETWEEN FREE CONVECTION AND SURFACE RADIATION IN A SQUARE CAVITY Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Issa Omle, Endre Kovács, Betti Bolló
This paper focused on finding ways to reduce the amount of heat that escapes through surfaces by using rough walls inspired by the design of silver ant's hair with triangular geometry and researching the impact of triangular roughness with changing angles on the internal thermal environment of the cavity. The thermal performance of square cavities is studied with isolated horizontal walls (upper and
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EFFICIENCY DETERMINATION OF SOLAR CHIMNEY POWER PLANT RETROFITTED WITH NOVEL FINNED COLLECTOR UNDER REAL-TIME SOLAR IRRADIANCE Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Ibrahim Shikh Hasan, Hayati Kadir Pazarlıoğlu, Kamil Arslan, Recep Ekiciler
This paper discusses the three-dimensional numerical study of a new finned collector integrated into the solar chimney power plant. Manzanares pilot's details, which are tower height 194.6 m, rooftop height 1.85 m, rooftop diameter 244 m, tower diameter 10.16 m, and pilot mean temperature 20°C with air speed 15 m/s, are implemented in this work to check the suitability of the finned collector as a
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PERFORMANCE ASSESSMENT OF PARABOLIC TROUGH COLLECTORS UNDER CLIMATIC CONDITIONS OF IZMIR, TURKEY: A CASE STUDY Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Mahsa Moloodpoor, Ali Mortazavi, Necdet Özbalta
The geographic location of Turkey offers significant potential for renewable energies, especially solar energy. One promising technology for solar energy generation is the parabolic trough collector. To shed light on the advantages of solar energy and the design of solar power plants, this study aims to estimate the heat gain and thermal efficiency of a parabolic trough collector (PTC) under the climatic
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OPTIMIZATION ANALYSIS OF PRINTED CIRCUIT HEAT EXCHANGER USED FOR HUMID AIR TURBINE CYCLE BY ECONOMY AND IRREVERSIBLE LOSS EVALUATION Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Junlin Chen, Chen Yang, Keyong Cheng, Xunfeng Li, Xiulan Huai
The printed circuit heat exchanger (PCHE) is a prospective candidate with great application potential in humid air turbine cycles due to its high efficiency and compactness. In the present study, a one-dimensional heat transfer and flow resistance model of both straight and zigzag channels was established based on segmental thermal design. The impact of moisture content on thermal hydraulic characteristics
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MELTING PROCESS SIMULATION OF PHASE CHANGE MATERIAL LAYER USED IN THE BUILDING ENVELOPE Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Ammar Saliby, Béla Kovács
The melting process of phase change material (PCM) for thermal energy storage purposes has been studied and simulated in this paper. Using the ANSYS (Fluent) 2023 R1 software, the melting of a rectangular PCM zone with left and right sides exposed to convection heat and the other sides adiabatic is simulated. The study also discusses the program specifications, numerical modeling equations, and assumptions
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IMPROVEMENT OF PERFORMANCE OF HEAT RECOVERY UNITS BY USING MAGNETIC NANOFLUID Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Mutlu Tarık Çakır
Waste heat recovery units are systems that are widely used in the preheating of clean air, which is needed in industrial and waste heat facilities, without contact with polluted air, especially during the pandemic period. In this study, it is aimed to increase the operating temperature range by improving the performance of a heat exchanger consisting of a heat pipe bundle and an integrated heat recovery
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OPTIMIZATION WITH TAGUCHI METHOD FOR INCREASING THE HEAT TRANSFER AND DRYING EFFICIENCY IN A NOVEL SOLAR COLLECTOR Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Selda Gözübüyük, Gökhan Ömeroglu, Ahmet Numan Özakın
To enhance the solar radiance absorption capability of a solar collector, a novel approach was employed by coating the absorber surface with a blackbody and utilizing nanofluid as the primary fluid to improve heat transfer performance and ultimately increase system efficiency. This study contains the performance analysis of the solar system that was performed by the Taguchi experimental optimization
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APPLICABILITY OF MACHINE LEARNING TECHNIQUES IN PREDICTING SPECIFIC HEAT CAPACITY OF COMPLEX NANOFLUIDS Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Youngsuk Oh, Zhixiong Guo
The complexity of the interaction between base fluids and nano-sized particles makes the prediction of nanofluid thermophysical properties difficult. However, machine learning techniques can be utilized as an alternative approach due to their ability to identify complex nonlinear patterns in data and make accurate forecasts. This paper presents intuitive predictions of specific heat of various types
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INFLUENCE OF VIBRATION ENVIRONMENT OF SHIP ENGINE ROOM ON COMBUSTION CHARACTERISTICS OF SMALL-SCALE POOL FIRES Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Liang Wang, Yinshu Guo, Jiasheng Cao, Zhilin Yuan, Yunfeng Yan, Jiaqi Dong, Shichuan Su
The vibration environment generated by various operating equipment in ship engine room can significantly affect the heat transfer and combustion characteristics of pool fires. In this paper, with n-heptane as fuel, the combustion characteristics and heat transfer characteristics of pool fire under vibration frequencies of 0 Hz, 3 Hz, 5 Hz, 7 Hz, 8 Hz, and 9 Hz are studied for pool with diameters of
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EXPERIMENTAL ANALYSIS OF A SOLAR DESALINATION SYSTEM WITH GRAPHENE NANOPLATELET-EMBEDDED LATENT HEAT THERMAL ENERGY STORAGE UNIT Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Ceylin Şirin, Fatih Selimefendigil
In the present work, it is aimed to improve the yield of a single-slope solar desalination system (SDS) using graphene nanoplatelet-embedded thermal energy storage unit (TSU). In the initial stage of this work, three SDSs with different slope angles of condensation surface including 40°, 50°, and 60° are considered. According to the result of the initial experiments, the SDS with 40° gave the superior
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ANALYSIS OF THE DYNAMICS AND FREEZING OF WATER DROPLETS ON METAL SURFACES Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Jinjin Tian, Hongyu Wang, Sunil S. Mehendale, Zhe Zhang, Mingpu Wu
This article investigates the effects of substrate temperature, tilt angle, and droplet size on droplet impact dynamics and freezing using a Motionpro high-speed camera and a DSA-30 droplet surface analyzer. The temperature of the substrate was changed from the ambient temperature of 21°C to −13°C, and three droplet sizes (D0 = 2.57, 3.02, and 3.54 mm) were studied. The results show that some air gets
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EXPLORING THE HEAT TRANSFER PERFORMANCE OF CYLINDRICAL HEAT PIPES WITH VARIED MOLAR Ag-DOPED GO HYBRID NANOFLUIDS − AN EMPIRICAL STUDY Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 M. Armstrong, M. Sivasubramanian, N. Selvapalam, Kanhaiya Kumar Jha
In our modern era of technological advancements, the widespread use of high-powered electronic and electrical devices has resulted in the release of excessive heat, posing a threat to the environment. To address this issue, heat pipes have emerged as a promising solution for effective heat removal. As researchers strive to improve their performance, various approaches have been explored. This study
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EXPERIMENTAL STUDIES ON Li-ION BATTERY PACK FOR TEMPERATURE DISTRIBUTION ANALYSIS DURING FAST DISCHARGING AND VARIOUS AMBIENT TEMPERATURE CONDITIONS Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 S. Hemavathi, C. R. Jeevandoss, Srirama Srinivas, A. S. Prakash
Lithium-ion batteries are the primary energy source for electric vehicles (EVs), which were developed to address environmental issues and the lack of energy resources. The temperature is a key factor in Li-ion batteries which affects their degradation and life span. In this study, the thermal performance characteristics of a 4S2P Li-ion battery pack are analyzed according to the change in the environmental
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Examining the Synergistic Use of East-West Reflector and Coal Cinder in Trapezoidal Solar Pond through Energy Analysis Heat Transf. Res. (IF 1.7) Pub Date : 2023-10-01 VINOTH KUMAR J, AMARKARTHIK ARUNACHALAM
This study examines the potential of salt gradient solar pond (SGSP) as a sustainable energy system for thermal energy storage. The research investigates the use of an East-West (EW) reflector and coal cinder additive (CC) to enhance the energy efficiency of a trapezoidal salt gradient solar pond (SGTSP). The study involved designing, fabricating, and analyzing the SGTSP systems with EW and CC, compared
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ENHANCING PERFORMANCE OF BIODIESEL-HYDROGEN BLENDS OPERATED DI DIESEL ENGINE USING VARIABLE INJECTION TIMING Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Ahmed Syed, Syed Mughees Ali
The study aimed to investigate the effect of injection timing (IT) on the combustion, emission, and performance characteristics of a single-cylinder, four-stroke, direct injection (DI) diesel engine. The engine was run on different fuel blends, namely, pure diesel, diesel blended with 20% mahua oil methyl ester (B20) with three hydrogen flow rates of 20, 22.5, and 25 liters per minute (lpm). The experiment
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EXPERIMENTAL INVESTIGATION OF THE RESUSPENDED NANOFLUID DROPLET EVAPORATION AT PERIODICALLY VARYING ELECTRIC FIELD Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Huiyong Lan, Shizhi Ye, Yalei Zhang, Yanjun Chen, Deqiang He, Yong Chen
The addition of nanoparticles can significantly increase the evaporation rate of droplets. However, there is still no consistent conclusion on whether the factor promoting droplet evaporation is the motion of suspended nanoparticles or the deposited nanoparticles changing the structure of the solid surface. Therefore, the fully deposited surfaces were prepared by drying 0.005−0.015 vol.% Al2O3−water
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EXPERIMENTAL INVESTIGATION OF ENERGY PERFORMANCE AND EXERGY DESTRUCTION OF SIMPLE AND ROUGH-SUPERHYDROPHOBIC VAPOR CHAMBERS FOR PCB TEMPERATURE CONTROL Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Vali Kalantar, Masood Nikmehr
In this research, two vapor chambers with the same dimensions were manufactured to control the temperature of the high-power printed circuit board (PCB). In one case, the evaporator and condenser were rough and superhydrophobic, respectively. Another vapor chamber was nonrough and nonsuperhydrophobic (simple). In this study, as new experimental work, the exergy destruction analysis was performed in
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EFFECT OF THE NANOFLUID FLOW AND EXTENDED SURFACES ON AN ABRUPT EXPANSION TUBE REGARDING THERMODYNAMIC IRREVERSIBILITY Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Hayati Kadir Pazarlioğlu, Recep Ekiciler
Numerous scientists have examined circular dimpled surfaces, tubes, and other approaches for enhancing heat transfer. Moreover, the dimples' angle of attack has a substantial effect on the tube's flow and thermal features. This numerical study presents a novel approach to enhancing heat transfer rate in a tube subjected to constant heat flux by incorporating a surface dimpling strategy and evaluates
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INVESTIGATION THE EFFECT OF CONCURRENT IMPLEMENTATION OF HYBRID NANOFLUID AND MODIFIED INSERTS ON THERMOHYDRAULIC PERFORMANCE OF A HEAT EXCHANGER TUBE Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Onur Metin Mertaslan, Orhan Keklikcioglu
This study aimed to enhance the thermal performance of a heat exchanger tube by employing a hybrid nanofluid comprising graphene−iron oxide nanoparticles and modified helical inserts. Three different forms of inserts, namely, barrel-type, hourglass-type, and flat-type, were tested, and the nanofluid was prepared by incorporating the nanoparticles at three different weight ratios, 0.50%, 0.75%, and
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A PARAMETRIC STUDY ON THE THERMAL HOMOGENEITY OF VAPOR CHAMBER IN A BATTERY COOLING SYSTEM Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Weiping Li, Longjian Li, Wenzhi Cui, Chen Zhan, Yuqi Zhang
For the battery cooling system, the large temperature difference of the coolant between the inlet and outlet leads to a decrease in the thermal homogeneity of batteries. To improve the thermal homogeneity, a designed composite liquid cooling system was analyzed combined with a grooved vapor chamber and a cooling plate. The parametric study on the thermal homogeneity was conducted including the height
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NUMERICAL INVESTIGATION OF HEAT TRANSFER AND TURBULENT FLUID FLOW FOR TRANSVERSE VORTEX GENERATORS WITH NANOPARTICLES Heat Transf. Res. (IF 1.7) Pub Date : 2024-01-01 Sara Barati, Amin Etminan, Kevin Pope
This paper proposes a simple design and easy-to-install vortex generator (VG) for heat exchangers to enhance heat transfer rates. The aim is to maintain low pressure drops and high heat transfer rates. The effects of the VG's geometrical parameters on thermal performance and pressure drop are investigated in this paper for divergent and convergent schemes using commercial software Comsol Multiphysics
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Experimental investigation on heat transfer and pressure loss characteristics of the grooved helically coiled tube heat exchanger Heat Transf. Res. (IF 1.7) Pub Date : 2023-08-01 Jiaming Cao, Xuesheng Wang, Yuyang Yuan, Zhao Zhang, Zhengyan Xiao
Helically coiled tube heat exchangers have long been a subject of intensive research due to their compact structure and efficient heat transfer capabilities. To further augment their performance, this study proposes a grooved helically coiled tube heat exchanger and establishes an experimental platform for a comparative analysis against a conventional helically coiled tube heat exchanger. Through the