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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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Heat transfer of nanofluid through helical minichannels with secondary branches Heat Mass Transfer (IF 1.867) Pub Date : 2020-10-23 Reza Bahoosh, Alireza Falahat
Heat transfer, fluid flow characteristics and entropy generation of water-Al2O3 nanofluid for cylindrical heat sinks with helical minichannels that have secondary branches are investigated experimentally. The minichannels helix angles are 45, 60 and 90 degrees; the volume fraction of nanoparticles variation is 0.05% – 0.1%; the Reynolds number range is between 113 to 478. The effects of the helix angle
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Investigation of melting of nanoparticle-enhanced phase change materials (NePCMs) in a shell-and-tube heat exchanger with longitudinal fins Heat Mass Transfer (IF 1.867) Pub Date : 2020-10-20 Hamid Masoumi, Ramin Haghighi Khoshkhoo
Latent heat storage units are considered as an effective solution for the mismatch problem between energy consumption and energy supply when utilizing solar energy. However, the low thermal conductivity of the current phase change materials (PCMs) is regarded as their main drawback. The present study used dispersing nanoparticles in PCM and installing longitudinal fins on the inner tube simultaneously
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Investigation of flow distribution and effect of aspect ratio on critical heat flux in multiple parallel microchannel flow boiling Heat Mass Transfer (IF 1.867) Pub Date : 2020-10-11 Ayyaz Siddique, Ketan Sakalkale, Sandip K. Saha, Amit Agrawal
In this paper, an experimental study on the effect of the low aspect ratio of microchannel on the critical heat flux (CHF) during saturated flow boiling of water is presented. Multiple parallel silicon microchannels with different aspect ratios, hydraulic diameter, and number of channels in the range of 0.2–0.5, 154.0–184.8 μm, and 3–9 respectively are fabricated, and the experiments are performed
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Performance assessment of PVT-air collector with V-groove absorber: A theoretical and experimental analysis Heat Mass Transfer (IF 1.867) Pub Date : 2020-10-11 Sourav Diwania, Anwar S. Siddiqui, Sanjay Agrawal, Rajeev Kumar
In this paper, the performance of a PVT (photovoltaic thermal) air collector with V-groove absorber in the air channel is theoretically and experimentally examined under different climate conditions of Ghaziabad city, India, in summer, June 2019. A low power brushless DC fan is fixed at the input of the air-channel to ensure the circulation of air through the V-groove. The energy balance equation is
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Heat transfer during pulsating liquid jet impingement onto a vertical wall Heat Mass Transfer (IF 1.867) Pub Date : 2020-10-10 J. Wassenberg, P. Stephan, T. Gambaryan-Roisman
Liquid jet impingement is used for cooling and cleaning in various industrial branches. The advantages of jet impingement include high heat and mass transport rates in the vicinity of the impingement point. Pulsating liquid jets impinging on horizontal substrates with a pulsation frequency around 100 Hz have been shown to increase the cooling efficiency in comparison to jets with continuous mass flow
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Evaluation of LES sub-grid scale models and time discretization schemes for prediction of convection effect in a buoyant pool fire Heat Mass Transfer (IF 1.867) Pub Date : 2020-10-10 Mohammad Safarzadeh, Ghassem Heidarinejad, Hadi Pasdarshahri
The identification of the type of regime has an essential effect on the selection of sub-grid scale and discretization methods, regarding the accuracy and computational time. In order to investigate the role of sub-grid scale and time discretization method in a pool fire modeling by the Large Eddy Simulation (LES), three sub-grid scales Smagorinsky, one-equation and Wall-Adapting Local Eddy-Viscosity
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Heat flux estimation in journal bearings using inverse heat transfer method Heat Mass Transfer (IF 1.867) Pub Date : 2020-10-09 Davoud Alibeyki, Reza Mehryar
Journal bearings are used in industrial equipment at high rotational speed. Normal and also fault operations of bearing increase the temperature of the bearing. Estimation of heat flux on the inner surface of the bearing and prediction of temperature of the bearing can prevent the damage to the bearing. In this research, these quantities are estimated in normal operation by an inverse method. The sequential
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Experimental and simulation of C45 steel bar heat treatment with the GTAW method application Heat Mass Transfer (IF 1.867) Pub Date : 2020-10-07 Adam Kulawik, Joanna Wróbel, Michał Sobiepański
The motivation of the paper is an attempt to indicate the relationship between the selected Gas Tungsten Arc Welding (GTAW) technology and the parameters of the boundary conditions for the simulation of the heat treatment process of elements made of medium-carbon steel. The authors of the paper prepared and described a series of numerical simulations and experimental studies concerning this problem
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Experimental and numerical studies of flow field and mass transfer phenomena on sinusoidal wavy walls Heat Mass Transfer (IF 1.867) Pub Date : 2020-10-03 T. Yamagata, N. Fujisawa
The flow field and mass transfer phenomena on wavy walls are studied both experimentally and numerically for application to the pipe-wall thinning of nuclear power plant. The numerical simulations are carried out using four turbulence models and the results are compared with the velocity field on wavy planar wall measured by particle image velocimetry, and the mass transfer coefficient data on a pipe
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An experimental and numerical study on heat transfer enhancement of a heat sink fin by synthetic jet impingement Heat Mass Transfer (IF 1.867) Pub Date : 2020-10-03 Longzhong Huang, Taiho Yeom, Terrence Simon, Tianhong Cui
Compared to traditional continuous jets, synthetic jets (jets with oscillatory flow such that the time-average velocity is zero) have specific advantages, such as lower power requirement, simpler structure and the ability to produce an unsteady turbulent flow that is known to be effective in augmenting heat transfer. This study presents experimental and computational results that document heat transfer
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Energy and exergy analysis of corrugated plate solar collector by forced convection using two different absorber plate material Heat Mass Transfer (IF 1.867) Pub Date : 2020-10-02 Piyush Kumar Pathak, Prakash Chandra, Gaurav Raj
In this paper, the experimental analysis of two types of corrugated plate solar collector (CPSC) using water as working fluid has been done. Two similar designs and dimensions of CPSC but different materials of absorber plates have been investigated, the collector1 is copper and collector 2 is aluminium. The performance of energy, exergy and total heat loss coefficient of CPSC were analysed and compared
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Experimental studies on the heat transfer characteristics of alumina/water nanofluid inside a helical coil tube Heat Mass Transfer (IF 1.867) Pub Date : 2020-10-02 Mohsen Mansouri, Seyed Amir Hossein Zamzamian
Laminar convective heat transfer and pressure drop characteristics of Al2O3-water nanofluid were experimentally investigated inside a horizontal Helical-Coil Tube (HCT) under constant heat flux boundary conditions for Dean numbers between 400 and 1600. The experiments have been performed using Al2O3-water nanofluid of three mass concentrations and heat fluxes at different flow rates. Thermal conductivity
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Moisture sorption isotherm and thermodynamic analysis of quinoa grains Heat Mass Transfer (IF 1.867) Pub Date : 2020-10-01 Sultan Arslan-Tontul
In literature, most studies have only focused on sorption characteristics of quinoa grains. This study is one of the limited studies that deal with the sorption properties of quinoa with a thermodynamic approach. In the designed study, the equilibrium moisture content of whole quinoa grains determined by the static gravimetric method and ten different sorption models were applied for the description
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Peculiarities in Leidenfrost water droplet evaporation Heat Mass Transfer (IF 1.867) Pub Date : 2020-10-01 Tadeusz Orzechowski
The investigations involved a large water droplet deposited on the heating surface, the temperature of which was higher than the Leidenfrost point. The main element of the experimental setup was the heating cylinder with K-type shielded thermocouple located in its centre just below the surface. The measuring system was located on highly sensitive scales. The analysis of the droplet behaviour in time
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Hydrodynamics analysis of Taylor flow in oil and gas pipelines under constant heat flux Heat Mass Transfer (IF 1.867) Pub Date : 2020-09-30 Sidique Gawusu, Xiaobing Zhang
This is an incompressible numerical study of the hydrodynamics and heat transfer characteristics of Taylor flow in vertical oil and gas pipelines under constant heat flux using the Volume-of-fluid (VOF) method in ANSYS Fluent, covering a wide range of Re(0.22 ≤ Re ≤ 800) and Ca(0.0075 ≤ Ca ≤ 0.35). Nusselt number (Nu) correlations were used to examine the heat transfer characteristics based on a set
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Experimental and numerical findings on VCR engine performance analysis on high FFA RSO biodiesel as fuel using RSM approach Heat Mass Transfer (IF 1.867) Pub Date : 2020-09-30 S. Murugapoopathi, D. Vasudevan
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Evaluation of performance of parallel connected vortex tubes using air, oxygen and carbondioxide with Taguchi method Heat Mass Transfer (IF 1.867) Pub Date : 2020-09-28 Hüseyin Kaya
This study involves an optimization procedure for the factors affecting the performance of the parallel connected vortex tube system using the Taguchi method. The effect of vortex tube inlet pressure, working fluid, nozzle material and nozzle number parameters on vortex tube performance were obtained as a percentage using experimental design and analysis. Experimental studies were carried out at inlet
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Effect of geometrical parameters on the evaporative heat transfer and pressure drop of R-134a flowing in dimpled tubes Heat Mass Transfer (IF 1.867) Pub Date : 2020-09-27 Kanit Aroonrat, Lazarus Godson Asirvatham, Ahmet Selim Dalkılıç, Omid Mahian, Ho Seon Ahn, Somchai Wongwises
An investigation was experimentally performed to explore the influence of geometrical parameters on the evaporative heat transfer coefficient and pressure drop of R-134a in dimpled tubes. The test sections were the counter-flow tube-in-tube heat exchanger, where the refrigerant was evaporated in the inner tube and hot water flows in the annulus. Seven dimpled tubes with various helical pitches (p)
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A prognostic analysis on experimental evaluation of thermosyphon using refrigerant R134a and water based on machine learning and optimization techniques Heat Mass Transfer (IF 1.867) Pub Date : 2020-09-27 Anand R S, Shibin David
Thermosyphon is an effective heat transfer device which is widely used all over the world for its ease of use, feasible with different environmental challenges. In this research article, the experimentation with different boiling point of working fluids water and R134a has been used in modified thermosyphon. The modified thermosyphon comprises of the cone frustum attached between the condenser and
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Experimental study and numerical modeling of heat and mass transfer in rubberwood during kiln drying Heat Mass Transfer (IF 1.867) Pub Date : 2020-09-26 Santi Khamtree, Thanate Ratanawilai, Chayut Nuntadusit, Hormoz Marzbani
Rubberwood (Hevea brasiliensis) is a major raw material used in furniture factories in southern Thailand. Proper kiln drying of the lumber plays a significant role on the efficient utilization of the final product. Overall quality-reducing defects in such a materials are inevitable, unless a correct and proper drying process is used. Therefore, the objective of the present study was to develop a three-dimensional
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Changes in micropore structure and moisture transport properties in fibrous porous media after ultrasound treatment Heat Mass Transfer (IF 1.867) Pub Date : 2020-09-21 Panpan Li, Enhai Liu, Zhenqian Chen
The binding force between water molecules and the solid skeleton of fibrous porous media, determined by the microscopic structure and chemical interactions, has a remarkable influence on the dehydration process. Therefore, the micropore structure is a key factor affecting the dewatering performance of fibrous porous media. In this paper, fibrous porous media is treated by ultrasound; then the micropore
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Influence of yacon syrup concentration and drying air temperature on properties of osmotically pre-dehydrated dried banana Heat Mass Transfer (IF 1.867) Pub Date : 2020-09-21 Leandro Levate Macedo, Cintia da Silva Araújo, Wallaf Costa Vimercati, Sérgio Henriques Saraiva, Luciano José Quintão Teixeira
Osmotic dehydration (OD) is a pre-treatment commonly used to incorporate solids and dehydrate fruits. In this study, the influence of mixed syrup (yacon and sucrose) concentration used in OD and drying air temperature on drying kinetics of banana osmotically dehydrated and characteristics of dried banana were evaluated. Yacon syrup (30°Brix) was produced and then sucrose was added, making mixed syrups
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Thermal and exergy assessment of solar chimney performance in various energy absorptions; using indoor experimental setup Heat Mass Transfer (IF 1.867) Pub Date : 2020-09-18 Ramin Mehdipour, Ehsan Mohammadi, Amir Mohammad Babaie Parsa, Hassan Nahalekah
Environmental pollution caused by burning fossil fuels, global warming, the greenhouse effect, and other factors has changed the approach of science to the use renewable energies. The main objective of this paper is to study the effects of diverse inputs (solar radiation) and collector geometries and also heat transfer of the solar chimney power plants (SCPP) model on the thermal and efficiency of
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Thermo-hydraulic performance of nanofluids in enhanced tubes - a review Heat Mass Transfer (IF 1.867) Pub Date : 2020-09-17 Neeti Arora, Munish Gupta
Technological developments are continuously growing to improve the efficiency of thermal systems on the demand of present era. To get rid of the scientists and engineers from traditional heat transfer intensification methods and to miniaturize thermal transport devices, novel and innovative techniques are obligatory. In this whole drive, the effective tube geometries and efficient working fluids perform
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Osmotic dehydration of cubic pieces of melon: description through a three-dimensional diffusion model considering the resistance to mass flows on the surface Heat Mass Transfer (IF 1.867) Pub Date : 2020-09-17 Rubens Maciel Miranda Pinheiro, Wilton Pereira da Silva, Denise Silva do Amaral Miranda, Cleide M. D. P. S. eSilva, Taciano Pessoa
The objective of this article was to describe the osmotic dehydration of cubic pieces of melon immersed in solutions of water and sucrose, using a three-dimensional solution of the diffusion equation in Cartesian coordinates, considering the resistance to mass flows on the surface. Three experiments were conducted at room temperature, with no continuous stirring, at the concentrations of 25, 45 and
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Investigation on the long-term performance of solar thermal powered adsorption refrigeration system based on hourly accumulated daily cycles Heat Mass Transfer (IF 1.867) Pub Date : 2020-09-15 Ji Wang, Eric Hu, Antoni Blazewicz, Akram W. Ezzat
When simulating a daily performance of a solar thermal powered adsorption refrigeration system, daily weather data (i.e. daily maximum and minimum ambient temperatures and daily total solar radiation) are normally used to simulate a 24-h refrigeration cycle. However, the simulation obtained in this way is not that accurate, due to which could not reflect real hourly processes during the daytime. In
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