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Coriolis and buoyancy effects on heat transfer in viewpoint of field synergy principle and secondary flow intensity for maximization of internal cooling Heat Mass Transfer (IF 1.867) Pub Date : 2021-03-01 Seyed Mostafa Hosseinalipour; Hamidreza Shahbazian; Bengt Sunden
The present investigation emphases on rotation effects on internal cooling of gas turbine blades both numerically and experimentally. The primary motivation behind this work is to investigate the possibility of heat transfer enhancement by dean vortices generated by Coriolis force and U-bend with developing turbulent in the view point of the field synergy principle and secondary flow intensity analysis
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Experimental study on laminar air flow through spiral channel packed with steel balls Heat Mass Transfer (IF 1.867) Pub Date : 2021-02-28 Mustafa Yasin Gökaslan, Mustafa Özdemir, Lütfullah Kuddusi
A great number of studies have been conducted pressure drop for packed bed and curved channel. However, pressure drop in the spiral packed beds has not been investigated. In this study, pressure drop in spiral packed beds which are made of two different channel widths (a = 10 mm and a = 15 mm) and three different ball diameters (d = 2.00, 2.38 and 3.17 mm) was investigated experimentally. Experiments
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Parametric effect of diverging perforated cones on the thermo-hydraulic performance of a heat exchanger tube Heat Mass Transfer (IF 1.867) Pub Date : 2021-02-27 Gaurav Prakash Srivastava, Anil Kumar Patil, Manoj Kumar
In the present work, conical frustums (d/D = 0.3) are used as turbulators to form an insert of a heat exchanger tube. Both the perforated and imperforated conical inserts in a diverging arrangement (DR arrangement) are experimentally studied. The effects of the parameters like pitch ratio (p/D), the number of perforated holes (N), and relative location of perforations (x/L) on thermal and fluid characteristics
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CFD investigation of fouling mechanisms in the crude oil preheat network Heat Mass Transfer (IF 1.867) Pub Date : 2021-02-27 Imen Kerraoui, Youcef Mahdi, Abdelkader Mouheb
Fouling phenomena, generally related to heavy crude oils and bituminous petroleum fractions, nevertheless affects significantly the preheat train (PHT) of the light Algerian crude oil. In this study, a two dimensional model was developed using the computational fluid dynamic (CFD) method in order to investigate fouling behavior in the PHT of Algiers refinery. A fouling model was proposed specifically
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Modeling mass transfer in brine salting of chickpea Heat Mass Transfer (IF 1.867) Pub Date : 2021-02-27 Rui Costa, Vânia Gomes, João F. M. Gândara
Salted chickpea (Cicer arietinum L.) is increasingly used in snack production and in home cooking by soaking in brines. Order to achieve better quality and higher nutrient content, it is important to model and understand the mass transfer processes during this operation. In this work, brine salting of chickpea was studied at 1, 5 and 20% salt concentrations, at temperatures of 25, 50, 75 and 100 °C
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Utilizing RSM for experimental modeling of mass transfer coefficients in a perforated rotating disc contactor (PRDC) Heat Mass Transfer (IF 1.867) Pub Date : 2021-02-25 Alireza Hemmati, Ahad Ghaemi
This study aims to examine and optimize the solvent extraction process of two different liquid-liquid systems, including toluene–acetone-water and n-butylacetate–acetone-water, in a perforated rotating disc contactor (PRDC) pilot plant according to response surface methodology (RSM). The interaction effects of four influential parameters of dispersed phase velocity, and continuous phase velocity, rotor
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Experimental and theoretical investigation of transparent sand composing of fused quartz and calcium bromide solution Heat Mass Transfer (IF 1.867) Pub Date : 2021-02-24 Xinrui Zhang, Gangqiang Kong, Hanlong Liu, Sheng Dai
The thermal conductivity of soil is a fundamental physical property related to heat conduction and also one of the widely applied parameters in geotechnical engineering. Thermal needle tests were performed to measure the thermal conductivity of transparent sand. The thermal conductivity of three particle sizes of transparent sand was measured at different porosities and temperatures. The result shows
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Numerical analysis of secondary airflow in a rotating cavity of a gas‐turbine at high operating points with vortex reducer implementation Heat Mass Transfer (IF 1.867) Pub Date : 2021-02-22 Alberto Mucci, Foster Kwame Kholi, Thierry Sibilli, June Kee Min, Man Yeong Ha, Geon Hwan Cho
Temperature and pressure ratios in gas turbines have grown over time to increase the performance and efficiency of the engine. This, in turn, has required improvements to the effectiveness of the secondary air system to enhance the cooling performance of critical components. Analysis of pressure losses in the secondary systems of aero gas turbines has identified a significant contribution in the bled
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Bioactive compounds conservation and energy-mass analysis in the solar greenhouse drying of blackberry pulps Heat Mass Transfer (IF 1.867) Pub Date : 2021-02-20 Anabel López-Ortiz, Azucena Silva Norman, Octavio García Valladares
Recently, the quality of food solar dried has been associated to solar irradiance, irradiation and UV-light. Different materials used as covering materials in direct solar dryers had different optical properties, thus, different quality should be expected in solar food drying. The objective of this study was to compare two direct solar dryers builder with different covering materials: Direct Solar
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Numerical and experimental investigation on heat transfer characteristics of nanofluids in a circular tube with CDTE Heat Mass Transfer (IF 1.867) Pub Date : 2021-02-12 Aoyu Zhang, Zhixiao Wang, Guibin Ding, Huibo Meng, Zongyong Wang
This paper reported numerical simulation investigations on heat transfer performance of ZrO2-water and Cu-water nanofluids in the tube with concentric double twisted element(CDTE)(Re = 6000-12000). Furthermore, experiments verified that the two-phase flow model method was more suitable for the numerical simulation of nanofluids in the tube with CDTE. The Nusselt numbers with CDTE and nanofluids obviously
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Numerical and experimental study for heat transfer enhancement of cubical heat source and dummy elements inside rectangular duct Heat Mass Transfer (IF 1.867) Pub Date : 2021-02-11 H. A. Refaey, Esraa Eslam, R. Y. Sakr, H. E. Abdelrahman
The present work introduces an experimental analysis of an array of 12 elements including two heat sources and the rest are dummy elements. The effect of the second heat source position on the heat transfer coefficient (HTC) of both heat source elements within the Reynolds number range of 4108 ≤ ReL ≤ 17,115 is studied. Moreover, 3D (CFD) numerical model is introduced and its predictions are compared
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Thin layer modelling and thermal performance of active mode modified greenhouse solar dryers Heat Mass Transfer (IF 1.867) Pub Date : 2021-02-10 Purusothaman Mani, Valarmathi Thirumalai Natesan
Open sun Crops drying is common in India even though a considerable time and dust accumulated. This is a serious issue. Workman ship and time reduction is needed to increase the productivity. Introduction of Green house solar dryer should be a right choice as against the conventional drying. The novel research focuses for retaining the nutritional values at higher level, very clean and with very less
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Thermal conductivity of porous sintered metal powder and the Langmuir shape factor Heat Mass Transfer (IF 1.867) Pub Date : 2021-02-10 Osama M. Ibrahim, Ahmed H. Al-Saiafi, Sorour Alotaibi
The objective of this study is to re-examine the classical parallel and classical series models of the effective thermal conductivity of porous media and review the underlying assumptions used to develop these asymptotic models. The Langmuir shape factor concept is introduced to gain insight into these classical models and add extra degrees of freedom to formulate semi-empirical correlations for the
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Thermoelectric generation in a PCM-based energy accumulator Heat Mass Transfer (IF 1.867) Pub Date : 2021-02-03 L. Henríquez-Vargas, A. Reyes, M. Quiroga, F. Angel, N. Pailahueque, P. Donoso-García
An existing laboratory scale solar energy accumulator based on phase change materials was adapted to study experimental and analytically its thermoelectric capabilities. Electric power generation levels were assessed to energize low powered systems. Variables of the study were the circulating air velocity at two levels and the cooling convection mechanism on the cold face of the thermoelectric modules
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Thermal performances and characteristics of thermosyphon heat pipe using alumina nanofluids Heat Mass Transfer (IF 1.867) Pub Date : 2021-02-03 Loula A. Shuoman, Mohamed Abdelaziz, S. Abdel-Samad
The thermal performance of a double tube two-phase closed thermosyphon (DTTPCT) using alumina nanofluid as working fluid in startup, steady state and shut down modes has been experimentally and theoretically evaluated. Gamma-Alumina (γ-Al2O3) nanoparticles with size of 40 nm were well dispersed, prepared and stabilized in distilled water base fluid at different particle concentrations.The axial wall
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Predicting the vaporization rate of a spreading cryogenic liquid pool on concrete using an improved 1-D heat conduction equation Heat Mass Transfer (IF 1.867) Pub Date : 2021-02-01 Jingya Dong, Chengjun Jing, Hao Wen, Min Tu, Jiajun Li
The accidental spilling of cryogenic liquid leads to formation of a spreading pool, which may result in pool fires, BLEVE(boiled liquid evaporate vapor explosion) or vapor cloud fire, such as liquefied natural gas, is flammable. The key aspect of evaluating the consequence of such a disaster is to predict vaporization rate of the spreading cryogenic liquid pool. In this study, an empirical function
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Experimental study on ethylene glycol/choline chloride deep eutectic solvent system based nanofluids Heat Mass Transfer (IF 1.867) Pub Date : 2021-02-01 Changhui Liu, Pan Jiang, Yixuan Huo, Tianjian Zhang, Zhonghao Rao
With the continuing development in the electric industry, highly efficient heat dissipation is of great significance due to the shrinkage of electric elements and increase in energy input. Working fluid, acting as a heat transfer medium, plays a core role in the thermal management. While, traditionally used working fluids suffer from either low thermal conductivity or relatively narrow liquid range
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Development of a modified standard apparatus for heat transfer measurements in highly viscous binary fluids Heat Mass Transfer (IF 1.867) Pub Date : 2021-02-01 Ann-Christin Fleer, Markus Richter, Roland Span
A modified so-called standard apparatus for heat transfer measurements in highly viscous binary fluids has been developed. It covers a viscosity range from 0.2 mPa∙s up to 1000 Pa∙s and is designed for measurements over a temperature range from 273 to 423 K. Concept and setup of the apparatus are described in detail, and uncertainties of the different elements of the measurement chain are discussed
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Investigation on the mitigation of environmental harmful emissions by incorporating nanoparticles to biofuel water nano emulsion in low heat rejection engine Heat Mass Transfer (IF 1.867) Pub Date : 2021-01-29 P.V Elumalai, C Sivakandhan, M Parathasarathy, S Mohamad Iqubal, M Arunkumar
The quantity of energy consumers in the country is extensive in the current quick-moving situation; the whole car industry puts a significant part in energy utilization. Biofuels have lured consideration among other alternative fuels as indicated by their natural element and synthetic creation.In this test, the aluminum nanoparticles are prepared by three various proportions (50, 100 and 150 ppm) being
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An experimental study of heat transfer enhancement with winglets inside a tube Heat Mass Transfer (IF 1.867) Pub Date : 2021-01-29 G. Liang, Md. Islam, Md. Mahbub Alam, Imad Barsoum
The thermal enhancement and pressure drop in a circular tube with radially-arrayed winglet vortex generator (VG) mounted inside at different orientations were experimentally studied. A series of four winglet rings containing VGs were on the inner surface of the tube at different sections. The effects of winglet attack angles β (0–45°), pitch ratios PR (1.6–4.8), porosity ratio γ (0–20%), winglet length
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Scale analysis for water jet impingement over a horizontal flat plate under film boiling configuration Heat Mass Transfer (IF 1.867) Pub Date : 2021-01-27 Dipak Chandra Das, Koushik Ghosh, Dipankar Sanyal
A scale analysis has been performed to investigate the film boiling heat transfer associated with cooling of a horizontal flat plate through water jet impinging. The forced convection film boiling of water is treated by classifying a wide spectrum of subcooling regime by two extreme situations of low and high subcooling dominated by mass evaporation and sensible heating respectively. A simple expression
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Oxygen transfer rate behavior in three phase electroflotation column Heat Mass Transfer (IF 1.867) Pub Date : 2021-01-24 Maroua Mejri, Lassaad Ben Mansour
The effects of bubble size, solids particle (impurities) and the respective physical mechanisms on gas–liquid columns have received little attention. Therefore, the objective of this work is to study the effect of solid concentration and the ratio of the bubble diameter to the solid diameter on the mass transfer characteristics. Experiments were conducted in a three phase electroflotation column for
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Natural convection heat transfer performance of additively manufactured tube bundle heat exchangers with novel fin design Heat Mass Transfer (IF 1.867) Pub Date : 2021-01-24 Sebastian Unger, Matthias Beyer, Heiko Pietruske, Lutz Szalinski, Uwe Hampel
We studied the heat transfer of finned heat exchanger configurations with a novel design. These novel fin designs use integrated pins to enhance the heat conduction from the fin base to the fin tip as well as the air-side heat transfer on the fin surface. Oval tubes with conventional circular plain fins (CPF) as well as novel circular integrated pin fins (CIPF) and serrated integrated pin fins (SIPF)
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Combined effects of filling ratio and wick surface coating on thermal performance of cylindrical heat pipes Heat Mass Transfer (IF 1.867) Pub Date : 2021-01-22 P. R. Jyothi Sankar, S. Venkatachalapathy, Lazarus Godson Asirvatham
Growing technological developments to improve the thermal efficiency of heat pipes resulted in many innovative techniques. The use of nanofluids with superior thermophysical properties compared to conventional fluids is one such technique. However, the service life of nanofluid driven heat pipes is affected by agglomeration and stability issues, demanding an alternate solution. Boiling heat transfer
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Heat transfer enhancement in Minichannel heat sinks using fully and partially filled coiled wire inserts Heat Mass Transfer (IF 1.867) Pub Date : 2021-01-22 Iyyamperumal Seerangan, Ting-Hsuan Huang, Yao-Hsien Liu
Enhanced heat transfer through minichannel heat sink is beneficial for engineering uses such as air conditioning, cooling system, and heat retrieval processes. In the current study, the heat transfer and friction factor were experimentally measured in a rectangular minichannel heat sink with coiled wire inserts. These coiled wires exhibited two wire diameters (0.4, 0.6 mm) and three pitches (1.2, 2
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Heat transfer characteristics of gravelly soils with different compactness during unidirectional freezing process Heat Mass Transfer (IF 1.867) Pub Date : 2021-01-21 Zhenyu Zhang, Qihao Yu, Jinguo Wang, Pan Yue, Enlong Liu, Xinbin Wang
During the construction of clay core rockfill dam in cold regions in winter, the heat transfer characteristics of gravelly soil are important to the anti-freezing control of the core. Laboratory experiment and field test data showed that the frost depth of gravelly soil in unconsolidated state was deeper than that in compacted state at the early period of soil freezing. With the increase of the freezing
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Effect of transverse synthetic jet on heat transfer characteristics of the heat sink situated in a rectangular channel with axial main flow Heat Mass Transfer (IF 1.867) Pub Date : 2021-01-18 Tzer-Ming Jeng, Sheng-Chung Tzeng, Ching-Wen Tseng, Yi-Chun Li
This study experimentally investigated the heat transfer characteristics of the heat sink situated in a rectangular channel with the axial main flow under a transverse synthetic jet. The heat sinks, made of aluminum alloy, were divided into three kinds: the finned heat sinks, the in-line pin-fin heat sinks and the pure aluminum-foam heat sink. Total 7 heat sinks were used as test specimens. There was
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Effect of fluidizing solids on wall-liquid mass transfer in a cylindrical cell with rotating central rod Heat Mass Transfer (IF 1.867) Pub Date : 2021-01-08 G. M. J. Raju, G. V. S. Sarma, K. V. Ramesh, C. Bhaskara Sarma
Limiting current density data were obtained at point electrodes fixed flush with inner surface of the outer cylinder of an electrochemical cell in which a coaxially placed cylindrical rod is rotated at different rotational velocities in the presence of fluidizing solids. The variables covered in the present study are rpm of inner annular rod, diameter of rod, solid fraction and flow rate of the electrolyte
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Contact angle dynamics during the impact of single water droplet onto a hot flat practical stainless steel surface under medium Weber numbers Heat Mass Transfer (IF 1.867) Pub Date : 2021-01-06 Deendarlianto, Muhammad Reza Pradecta, Tirto Prakoso, Indarto, Windy H. Mitrakusuma, Adhika Widyaparaga
An experimental study on the contact angle dynamic during the impact of single water droplet onto a hot flat practical stainless steel surface under medium weber number was performed. The tested solid material was practical stainless steel of SUS 304. The surface roughness of the hot surface, the static contact angle at ambient pressure, and the diameter of the solid materials were respectively Ra = 0
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Predicting the engine trade-off study and performance characteristics using different blends of methyl Ester fish oil and higher alcohol with aid of artificial neural network based multi objective optimization Heat Mass Transfer (IF 1.867) Pub Date : 2021-01-06 S. K. Gugulothu, J. Ramachander, A. Kiran Kumar
The present works focus on the preparation of a novel bio-diesel from Methyl esters fish oil and assessment in a compression ignition engine. The process is optimized with different oil-methanol ratio and catalyst concentration to obtain a maximum yield of 99%. With that purpose, B20, B30, and B40 (by volume) of biodiesel and isobutanol was added to diesel to make different blends, and its properties
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Combined effect of pulsed electric fields and ultrasound on mass energy transfer and diffusion coefficient of plum Heat Mass Transfer (IF 1.867) Pub Date : 2021-01-06 Abdul Rahaman, Xin-An Zeng, Ankita Kumari, Muhammad Adil Farooq, Azhari Siddeeg, Muhammad Faisal Manzoor
The aim of the study was to investigate the impact of combined application of pulsed electric fields (PEF) and ultrasound (US) pre-treatment on drying kinetics, mass transfer and convective water diffusion coefficient on plum fruit. The treatment was performed by using plum fruit in water for uniform distribution of electric conductivity and PEF treatment was applied at 1, 2 and 3 kV/cm, 50 pulses
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Influence of applied pressures and casting section thicknesses on interfacial heat transfer in squeeze casting of magnesium alloy AZ91 Heat Mass Transfer (IF 1.867) Pub Date : 2021-01-06 Luyang Ren, Anita Hu, Yintian Fu, Henry Hu
The estimation for interfacial heat transfer coefficient (IHTC) between casting and mold is paramount to predict solidification phenomena. In this study, three hydraulic pressures of 30, 60, and 90 MPa were applied to indirectly squeeze cast magnesium alloy AZ91 in a P20 steel mold with five casting section thicknesses of 2, 4, 8, 12, and 20 mm, named steps 1, 2, 3, 4 and 5, by using a 75-ton hydraulic
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Hygrothermal behavior of wood fiber insulation, numerical and experimental approach Heat Mass Transfer (IF 1.867) Pub Date : 2021-01-05 M. Asli, E. Sassine, F. Brachelet, E. Antczak
Many new insulation materials are being developed and thermally tested aiming at understanding and improving their insulation characteristics in order to improve the energy performance of new and existing buildings. Bio-sourced materials appear among the new insulation solutions presenting the advantage of being able to save energy on one hand and having a low environmental impact on the other. The
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A novel contactless transient method for measuring local values of heat transfer coefficient Heat Mass Transfer (IF 1.867) Pub Date : 2021-01-04 Stanislav Solnař, Martin Dostál, Tomáš Jirout
This paper presents a new non-contact transient method for measuring the heat transfer coefficient. The proposed method is based on measuring the temperature response of the surface temperature to the heat flux irradiating the same surface, which is affected by the heat transfer coefficient on the back of the surface. The theoretical solution of this problem together with the measured experimental
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Experimental and numerical study of flow and thermal transport in fractured rock Heat Mass Transfer (IF 1.867) Pub Date : 2021-01-04 Yashar Tavakkoli Osgouei, Serhat Akin
An experimental and numerical study was carried out to investigate matrix-fracture thermal transport in fractured rock. Two different synthetically fractured core plugs were used during the flow-through experiments while core plugs’ outer surface was maintained at two different constant temperatures. To investigate the matrix-fracture thermal transport, cold water was injected through the single fracture
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Evaluation of desorption isotherms, drying characteristics and rehydration properties of crab stick by-product Heat Mass Transfer (IF 1.867) Pub Date : 2021-01-04 Traiphop Phahom, Napapon Juntharat, Panyaporn Premsuttarat, Yosita Paosunthia, Gaelle Roudaut
Crab stick by-product is the underspecification product from crab stick production. The by-product contains high moisture content inducing a short shelf life. Therefore, drying is considered as a food preservation technique to extend its shelf life. This study is focused on an investigation of desorption isotherms, drying characteristics and rehydration properties of crab stick by-product. Desorption
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Effect of enclosure on heat transfer characteristics of dual swirling flame impinging on a flat surface Heat Mass Transfer (IF 1.867) Pub Date : 2021-01-02 Girish Sapra, Subhash Chander
Experimental investigations have been carried out for impingement heat transfer characteristics of an enclosed dual swirling flame for various enclosure configurations. Effects of the size of the enclosure (DE = 70 mm, 90 mm, 90 mm, 110 mm and 150 mm) and the level of gap between the top of the enclosure and the target surface (G = 12, 16, 20, 24 and 28 mm) have been examined at fixed other operating
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A critical review on measures to suppress flow boiling instabilities in microchannels Heat Mass Transfer (IF 1.867) Pub Date : 2021-01-02 Ning Mao, Jiaojiao Zhuang, Tianbiao He, Mengjie Song
Due to the development of the electronic components, concentrator photovoltaic, fuel cell, etc., the cooling requirement of the devices increases rapidly. Due to the higher heat transfer and compact design of the microchannel technology, it has been widely considered and investigated to solve the increasing heat flux. Boiling heat transfer is an effective way to dissipate a mass of heat using the latent
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Introducing a holistic approach to model and link fouling resistances Heat Mass Transfer (IF 1.867) Pub Date : 2020-12-21 Florian Schlüter, Wolfgang Augustin, Stephan Scholl
Fouling is the unwanted deposition of soils on heat transfer surfaces and is a major challenge for industry and has been s subject to scientific investigations for decades, still being an unsolved problem for many applications. A fouling situation is commonly quantified with the thermal fouling resistance describing the integral fouling behavior of an apparatus. Modeling of this quantity is a permanent
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Investigation on the droplet evaporation process on local heated substrates with different wettability Heat Mass Transfer (IF 1.867) Pub Date : 2020-12-09 Li Wang, Zeyu Liu, Xin Wang, Yuying Yan
Marangoni effect is one of the critical factors in the droplet evaporation process, which is caused by surface tension gradient in the droplet interface. In this study, local heating is adopted to provide a more complicated temperature distribution on the droplet surface, and a detailed numerical investigation is carried out to address the effect of Marangoni flow on the droplet evaporation behaviour
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Thermal conductivity models of sandstone: applicability evaluation and a newly proposed model Heat Mass Transfer (IF 1.867) Pub Date : 2020-11-27 Yanjun Shen, Xu Wang, Yongzhi Wang, Keping Zhou, Jinyuan Zhang, Huan Zhang, Jielin Li
The thermal conductivity (TC) of rock has a general application in safety assessment and engineering optimization of deep geological engineering practices such as geothermal mining and nuclear waste disposal. Determining the TC of rock by using a TC model is a convenient and effective method for such evaluation, and selecting a suitable TC model is key for ensuring accurate calculation results. In
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Theoretical investigation of performances of zeolite Y and SAPO-34 coatings for adsorption heat pump applications Heat Mass Transfer (IF 1.867) Pub Date : 2020-11-25 Melkon Tatlier
SAPO-34 and Y are two of the most commonly investigated zeolites for adsorption heat pump/cooling applications, due to their favorable adsorption properties. Some observations that mass transfer may be a limiting factor for SAPO-34 and faujasite (X/Y) coatings deserve further inquiry to understand better the performance limits of these materials. In this study, a theoretical investigation was made
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Flow boiling heat transfer capabilities of R134a low GWP substitutes inside a 4 mm id horizontal smooth tube: R600a and R152a Heat Mass Transfer (IF 1.867) Pub Date : 2020-11-23 Giovanni A. Longo, Simone Mancin, Giulia Righetti, Claudio Zilio
R134a was recognized as probably one of the most important refrigerants of the two past decades. Among the proposed alternative fluids, there are certainly isobutane (R600a) and R152a. This article presents about 200 new heat transfer coefficient and pressure drop data obtained during flow boiling of R152a and R600a inside a smooth copper tube having an internal diameter of 4 mm. Three saturation temperatures
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Three dimensional numerical analysis of heat transfer during spray quenching of 22MnB5 steel with a single nozzle Heat Mass Transfer (IF 1.867) Pub Date : 2020-11-20 Emre Bulut, Gökhan Sevilgen, Ferdi Eşiyok, Ferruh Öztürk, Tuğçe Turan Abi
In this paper, a three dimensional Computational Fluid Dynamics Model (CFD) model was generated for spray cooling of straight parts by using a single point nozzle. The numerical simulations of spray quenching were performed to investigate the cooling rate of a 22MnB5 hot steel blank commonly used material in the automotive industry. Experiments are carried out to examine infrared thermograph of hot
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Capillary performance analysis of copper powder-fiber composite wick for ultra-thin heat pipe Heat Mass Transfer (IF 1.867) Pub Date : 2020-11-19 Junyi Niu, Ning Xie, Xuenong Gao, Yutang Fang, Zhengguo Zhang
Excellent ultra-thin heat pipes (UTHP) require a wick with high capillary force (ΔPc) and a good permeability performance (K). In this work, a copper powder-fiber composite wick was fabricated by sintering of the copper powder and fiber mixture. Effects of the copper powder particle size, copper powder volume ratio, as well as the super-hydrophilic treatment were investigated, and the results indicate
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Jet impingement heat transfer within a hemisphere Heat Mass Transfer (IF 1.867) Pub Date : 2020-11-18 Derwalt J. Erasmus, Matti Lubkoll, Theodor W. von Backström
Jet impingement heat transfer finds applications where a large heat flux is required between a fluid and a surface. Impinging jets can be implemented in Concentrating Solar Power (CSP) thermal receivers and bayonet tube heat exchangers. A simultaneous outlook on the heat transfer and total pressure loss (performance) characteristics of several jets impinging on a concave hemispherical surface are investigated
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Effect of various shape and nanoparticle concentration based ternary hybrid nanofluid coolant on the thermal performance for automotive radiator Heat Mass Transfer (IF 1.867) Pub Date : 2020-11-17 Rashmi Rekha Sahoo
The performance evaluation of radiator with the application of a new coolant, water-based of various shape nanoparticles i.e., spherical (CuO), cylindrical (CNT), platelet (Graphene) and vol. concentrations based ternary hybrid nanofluid have been investigated theoretically. Impact of heat transfer rate and pressure drop along with exergetic analysis on vol. fraction of ternary hybrid nanofluid, coolant
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Conjugate heat transfer study comprising the effect of thermal conductivity and irreversibility in a pipe filled with metallic foams Heat Mass Transfer (IF 1.867) Pub Date : 2020-11-17 Prakash H. Jadhav, Gnanasekaran Nagarajan, D. Arumuga Perumal
A parametric study is proposed in this paper to examine heat dissipation rate and entropy generation of a forced convection in a horizontal pipe which is filled with high porous metallic foams. The study quantifies the effect of thermal conductivity and pore density on entropy generation when the pipe is fully filled with copper, aluminium and nickel metallic foams of 0.6 m length in the fluid flow
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Drying kinetics of tomato ( Solanum lycopersicum ) and Brinjal ( Solanum melongena ) using an indirect type solar dryer and performance parameters of dryer Heat Mass Transfer (IF 1.867) Pub Date : 2020-11-13 Abhay Lingayat, Chandramohan V. P., Raju V. R. K., Suresh S.
Tomato (Solanum lycopersicum) and brinjal (Solanum melongena) are food products that are frequently wasted in Indian markets as their shelf lives are only a few days. An indirect type solar dryer (ITSD) has been developed. It’s performance and drying kinetics of brinjal and tomato slices have been analyzed. The moisture content of tomato decreased from 15.667 to 0.803 kg/kg of dry basis (db) and that
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A review on start-up characteristics of the pulsating heat pipe Heat Mass Transfer (IF 1.867) Pub Date : 2020-11-11 Dongwei Zhang, Zhuantao He, Erhui Jiang, Chao Shen, Junjie Zhou
Pulsating heat pipe (PHP) is a two-phase heat transfer device, and the start-up characteristics plays a crucial role in its practical application and stable operating performance. This paper introduced the start-up principle of PHP and reviewed the influences of the cross-sectional shape, the physical property parameters and the external field action (i.e., magnetic field, ultrasonic wave etc.) on
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Experimental investigation on flash evaporation of water at different water depths with functional analysis method Heat Mass Transfer (IF 1.867) Pub Date : 2020-11-11 Siguang Li, Yanjun Li, Lili Liu, Longbin Yang, Xiaojin Zhang, Runzhang Xu
It is important to study the temperature stratification phenomenon in flash evaporation to well design the marine accumulator and some related industrial equipment. Therefore, a series of flash evaporation experiments with initial temperature of 65.0 °C ~ 84.4 °C and superheat degree of 5.0 °C ~ 30.0 °C are carried out to study the temperature variations at different water depths. Meanwhile, the functional
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Nonlocal heat conduction in silicon nanowires and carbon nanotubes Heat Mass Transfer (IF 1.867) Pub Date : 2020-11-11 Mingtian Xu
Experimental results showed that the effective thermal conductivity of silicon nanowire is smaller than the bulk thermal conductivity, while that of carbon nanotube (CNT) is usually much larger than its bulk counterpart. In order to resolve this paradox, a nonlocal heat conduction model for one-dimensional materials is proposed. This nonlocal model indicates that the different heat conduction boundary
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Natural convection heat transfer from vertical 9 × 9 rod bundles in liquid sodium Heat Mass Transfer (IF 1.867) Pub Date : 2020-11-10 Koichi Hata, Qiusheng Liu, Takashi Nakajima
Natural convection heat transfer from vertical 9 × 9 rod bundle in liquid sodium was numerically analyzed to optimize the thermal-hydraulic design for the bundle geometry with equilateral square and triangle arrays (ESA and ETA). Unsteady laminar three-dimensional fundamental equations of natural convection heat transfer caused by step heat flux were solved numerically until the solution reached a
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Analysis degrees superheating refrigerant R141b on evaporator Heat Mass Transfer (IF 1.867) Pub Date : 2020-11-10 Muhamad Yunus Abdullah, Prabowo, Bambang Sudarmanta
Indonesia is country that owns large enough source of geothermal energy. One effort can be done by utilizing geothermal energy as source for electrical energy generation. To produce a source of electrical energy using ORC using water (H2O) as a working fluid. In this research ORC system uses Refrigerant R-141b as a work fluid for water experiment (H2O) used at Rankine cycle at general. There are 4
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Exergy analysis of Shell and helical coil heat exchanger and design optimization Heat Mass Transfer (IF 1.867) Pub Date : 2020-11-08 Audai Hussein Al-Abbas, Akeel Abbas Mohammed, Atheer Saleh Hassoon
In this study, experimental investigations and exergy analysis on shell and helically coiled tube heat exchanger are carried out for free convection heat transfer. The measured data are totally optimised utilizing thermodynamics rules in which exergy study is performed to investigate the thermal performance of the helical system under different operating conditions. The experimental set-up of apparatus
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Experimental and ANN modeling study on microwave dried onion slices Heat Mass Transfer (IF 1.867) Pub Date : 2020-11-07 Mohsen Beigi, Mehdi Torki
The present work deals mainly with dehydration characteristics of onion slices. Microwave power levels of 100, 350, 550 and 750 W was practiced to dry onion slices with thicknesses of 2.5, 5, 7.5 and 10 mm. The results showed that moisture diffusivity and specific energy consumption of the process increased with both increasing microwave power and the samples thickness, and ranged from 0.82 × 10−8
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Water droplet freezing on cold surfaces with distinct wetabilities Heat Mass Transfer (IF 1.867) Pub Date : 2020-11-06 Armin Bodaghkhani, Xili Duan
This paper investigates the total freezing time of droplets on surfaces with various wettabilities with horizontal and inclined orientations. A two-dimensional Volume of Fluid (VOF) method was applied to capture the liquid-air interface, and an automatic localized grid treatment technique was applied to increase the accuracy, especially near the impact and spreading areas. The Kistler and Shikhumurzaev
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Paper title: thermochemical heat storage behavior of ZnSO 4 .7H 2 O under low-temperature Heat Mass Transfer (IF 1.867) Pub Date : 2020-10-31 Ata Ur Rehman, Muhammad Khan, Zheng Maosheng, Ahsen Riaz Khan, Asif Hayat
Thermochemical heat storage materials for space heating applications such as, ZnSO4 offer high energy storage density, low cost and clean mean of long-term solar energy storage. Herein, we studied the ZnSO4 hydrated salt as potential heat storage material at low temperature and furthermore observed the impact of temperature and concentration on the dehydration/hydration process and enthalpy. The thermal
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The combined effects of filling ratio and inclination angle on thermal performance of a closed loop pulsating heat pipe Heat Mass Transfer (IF 1.867) Pub Date : 2020-10-27 Burak Markal, Kubra Aksoy
In the present study, a series of experiments are conducted to investigate the thermal performance of a copper made pulsating heat pipe consisting of uniform flow passages with the cross section of 2 mm × 2 mm. Test conditions cover two orientations (0° and 90°) and six different filling ratios (10%, 25%, 40%, 55%, 70% and 85%). The working fluid used in the experiments is methanol. Heat inputs are
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Dynamic evolution of negative pressure impact of cross-cut on oxygen concentration field in coal mine Goaf Heat Mass Transfer (IF 1.867) Pub Date : 2020-10-24 Liangzhou Chen, Jian Yang, Pengxiang Ding
For further understanding the coal spontaneous combustion in goaf, the dynamic evolution of the oxygen concentration field influenced by the condition of negative pressure of cross-cut were analyzed. Based on the on-site testing results, the range of the oxidation zone on the headentry and tailentry side is determined as 30 ~ 75 m and 15 ~ 65 m respectively. This paper adopts a new method called “fixed
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