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Journal articles on the topic 'Convective heat transfer coefficient (h)'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Jani, Jaronie Mohd, Sunan Huang, Martin Leary, and Aleksandar Subic. "Analysis of Convective Heat Transfer Coefficient on Shape Memory Alloy Actuatorunder Various Ambient Temperatures with Finite Difference Method." Applied Mechanics and Materials 736 (March 2015): 127–33. http://dx.doi.org/10.4028/www.scientific.net/amm.736.127.

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The demand for shape memory alloy (SMA) actuators for technical applications is steadily increasing; however SMA may have poor deactivation time due to relatively slow convective cooling. Convection heat transfer mechanism plays a critical role in the cooling process, where an increase of air circulation around the SMA actuator (i.e. forced convection) provides a significant improvement in deactivation time compared to the natural convection condition. The rate of convective heat transfer, either natural or forced, is measured by the convection heat transfer coefficient, which may be difficult

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2

Zhang, Ruihao, Sixian Wang, Shan Qing, Zhumei Luo, and Zhang Xiaohui. "Research on convective heat transfer characteristics of Fe3O4magnetic nanofluids under vertical magnetic field." Thermal Science, no. 00 (2021): 151. http://dx.doi.org/10.2298/tsci201215151z.

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This paper focuses on the convective heat transfer characteristics of Fe3O4 /Water magnetic nanofluids under laminar and turbulent conditions. After verifying the accuracy of the experimental apparatus, the effects of magnetic field strength, concentration, Reynolds number and temperature on the convective heat transfer coefficient have been studied. The convective heat transfer characteristics of nanofluids under laminar and turbulent flow conditions were studied in depth, and the influence of each factor on the heat transfer coefficient was analyzed by orthogonal experimental design method.

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3

Rozas, Carlos, Oswaldo Erazo, Virna Ortiz-Araya, Rodrigo Linfati, and Claudio Montero. "Experimental and Statistical Determination of Convective Heat and Mass Transfer Coefficients for Eucalyptus nitens Sawn Wood Drying." Forests 15, no. 8 (2024): 1287. http://dx.doi.org/10.3390/f15081287.

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This study aimed to develop a model using experimentally obtained convective heat and mass transfer coefficients to predict the effect of temperature, humidity, and drying rate on wood drying. Tangential wood samples of Eucalyptus nitens (H. Deane & Maiden) were used in the investigation. The experimental design consisted of two temperature levels (40 °C and 55 °C), two relative humidity levels (55% and 75%), and two air velocity settings (2 m·s−1 and 3 m·s−1). The experiments were conducted under a constant evaporation rate, spanning the maximum and critical moisture content in the wood.

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Luo, Chuan, Chuan Li, Xiaorong Wan, and Zhengang Zhao. "Convective Heat Transfer Coefficient of Insulation Paper–Oil Contact Surface of Transformer Vertical Oil Channel." Coatings 13, no. 1 (2023): 81. http://dx.doi.org/10.3390/coatings13010081.

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Insulation paper is the primary inter-turn insulation material for transformer windings. However, insulation paper is a poor conductor of heat and seriously impacts the natural convective heat dissipation in the winding oil channels. In order to study the convective heat transfer performance of the transformer vertical oil channel, the heat transfer characteristics of the two-dimensional boundary layer of the insulation paper–oil contact surface were analysed, and a characteristic number equation with a roughness correction factor was established. Based on the similarity principle and modellin

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5

Anderson, Ann M. "Decoupling Convective and Conductive Heat Transfer Using the Adiabatic Heat Transfer Coefficient." Journal of Electronic Packaging 116, no. 4 (1994): 310–16. http://dx.doi.org/10.1115/1.2905703.

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In many heat transfer situations, such as those found in the electronics cooling field, more than a single mode of heat transfer occurs. For example, modules on a printed circuit board dissipate heat through convection to the air, through conduction to the board and through radiation to the surroundings. The adiabatic heat transfer coefficient, had, works well in such situations because it describes the change in wall temperature due to each incremental change in the convective heat transfer rate (due to conduction, radiation, or generation in the wall). The value of had is independent of the

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6

Chowdhury, Manojit, Ankita Banerjee, Rahul Das, Shrilekha Das, and Kamlesh Prasad. "Influence of Temperature and Mass Flow Rate on Heat Transfer Characteristics in Parallel Flow Corrugated Plate Heat Exchanger." Journal of Agricultural Engineering (India) 62, no. 1 (2025): 120–34. https://doi.org/10.52151/jae2025621.1917.

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Efficient heat exchangers (HEs) are essential components in various industrial processes, enabling transfer of thermal energy between fluids. Current research investigated heat transfer and fluid flow characteristics of a corrugated surface type parallel flow plate heat exchanger (PHE) with water as a heat transfer fluid. The study aims to enhance our understanding of how these operational parameters impact heat transfer performance and provide insights into optimizing the design and operation of such HEs for improved energy efficiency. The performance of HE was evaluated at variable temperatu

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7

Gao, Ling, Wen Guang Geng, Xiao Xu Ma, Xiu Li Ma, Guang Liang Luo, and Xuan You Li. "An Experimental Investigation on the Heat Transfer Coefficient of Oscillating Heat Pipes." Advanced Materials Research 732-733 (August 2013): 78–82. http://dx.doi.org/10.4028/www.scientific.net/amr.732-733.78.

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This paper presents an experimental study on total heat transfer coefficient (ht) in oscillating heat pipe heat exchanger hot air flow tunnels, ht plays an important role in the oscillating heat pipes design process. In this paper, ht and the convective heat transfer coefficient (h) was investigated by experimentally and theoretical calculation respectively. From experimental study, the relationship between the ratio of heat transfer coefficient and the relative humidity is obtained. The results show that the ratio of ht to h increases from 5 to 20 as the relative humidity of the hot gas incre

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8

Xu, Qian, Yunbing Wu, Ye Chen, and Zhengwei Nie. "Unlocking the Thermal Efficiency of Irregular Open-Cell Metal Foams: A Computational Exploration of Flow Dynamics and Heat Transfer Phenomena." Energies 17, no. 6 (2024): 1305. http://dx.doi.org/10.3390/en17061305.

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An open-cell metal foam has excellent characteristics such as low density, high porosity, high specific surface area, high thermal conductivity, and low mass due to its unique internal three-dimensional network structure. It has gradually become a new material for enhanced heat transfer in industrial equipment, new compact heat exchangers, microelectronic device cooling, etc. This research established a comprehensive three-dimensional structural model of open-cell metal foams utilizing Laguerre–Voronoi tessellations and employed computational fluid dynamics to investigate its flow dynamics and

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9

Schutzeichel, Maximilian Otto Heinrich, Thorben Strübing, Ozan Tamer, Thomas Kletschkowski, Hans Peter Monner, and Michael Sinapius. "Experimental and Numerical Investigation of a Multifunctional CFRP towards Heat Convection under Aircraft Icing Conditions." Applied Mechanics 3, no. 3 (2022): 995–1018. http://dx.doi.org/10.3390/applmech3030056.

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A combined experimental and numerical approach for the analysis of convective heat transfer from a multifunctional flat plate specimen under aircraft icing conditions is presented. The experimental setup including a heat control and measurement system that is installed in a de-icing test bed. The ambient temperature (θa=[253,283]K), air velocity (va={0,15,30}ms), and angle of attack (α={10,30}∘) are varied, and their influence on heat transfer during local Joule heating is discussed. The numerical approach utilises the results to compute the convective heat transfer coefficients (HTC) based on

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10

Farhadi, M., K. Sedighi, and M. M. Madani. "Convective cooling of tandem heated squares in a channel." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 223, no. 4 (2008): 965–78. http://dx.doi.org/10.1243/09544062jmes1078.

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This article elaborates on the numerical simulation of forced convective incompressi-ble flow in a horizontal plane channel and heat transfer over two isothermal tandem square cylinders. Finite-volume method was applied to discretize the momentum and energy equations. This study details the effects of S/ H (gap between two squares), Reynolds number, and blockage ratio on the characteristics of flow field and heat transfer. The blockage ratios and Reynolds numbers were chosen between 12.5 to 50 per cent and 100≤ Re≤300, respectively. Results are presented in the form of time-averaged streamline

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Darweesh, Alaa, and Zina K. Kadhim. "Effect of aspect ratio of a corrugated cavity filled with porous media on the coefficient of heat transfer." Wasit Journal of Engineering Sciences 10, no. 3 (2022): 218–33. http://dx.doi.org/10.31185/ejuow.vol10.iss3.355.

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Solar power, thermal storage facilities, reactor cooling and microelectronic devices are all examples of renewable energy use natural convection heat transfer from a heated supplier to a chilly environment or enclosure. The purpose of this research is to investigate the influence of porous media on the convective heat transfer coefficient and the modified Rayleigh number as a function of the cavity's aspect ratio. This study investigated the free convective 3D flow then heat transmission in a cavity that has a width of 20 cm in width, a depth of 2.7 cm in depth, and varying heights of 20, 25 a

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Ndlovu, Partner L., and Raseelo J. Moitsheki. "Analysis of a Convective-Radiative Continuously Moving Fin with Temperature-Dependent Thermal Conductivity." International Journal of Nonlinear Sciences and Numerical Simulation 21, no. 3-4 (2020): 379–88. http://dx.doi.org/10.1515/ijnsns-2018-0206.

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AbstractIn this article, the differential transform method (DTM) is used to solve the nonlinear boundary value problems describing heat transfer in continuously moving fins undergoing convective-radiative heat dissipation. The thermal conductivity is variable and temperature dependent. The surface of the moving fin is assumed to be gray with a constant emissivity ɛ. The flow in the surrounding medium provides a constant heat transfer coefficient h over the entire surface of the moving fins. The effects of some physical parameters such as the Peclet number, Pe, thermal conductivity parameter, β

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13

Küheylan, Cüneyt Deniz, and Derya Burcu Özkan. "Experimental and Theoretical Study of Heat Transfer in a Chilled Ceiling System." Applied Sciences 14, no. 13 (2024): 5908. http://dx.doi.org/10.3390/app14135908.

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Radiant cooling has been growing in recent years due to energy savings and improved comfort and health. The aim of this study was to reduce energy consumption and provide comfort using a chilled ceiling panel in the zone. In the experimental part of this study, a test room was created to investigate the change in the heat transfer performance of a chilled ceiling panel according to different water temperatures, different water flow rates and different heat source values. As a result of the experimental study, it was found that optimum conditions were achieved with a heat rate of 280 Watts and

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14

Tan, He-Ping, Jian-Feng Luo, and Xin-Lin Xia. "Transient Coupled Radiation and Conduction in a Three-Layer Composite With Semitransparent Specular Interfaces and Surfaces." Journal of Heat Transfer 124, no. 3 (2002): 470–81. http://dx.doi.org/10.1115/1.1418699.

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Transient coupled radiative and conductive heat transfer in a three-layer absorbing and isotropically scattering composite with semitransparent specular interfaces and surfaces is investigated. The transient energy equation is solved by the full implicit control-volume method in combination with spectral band model. The radiative heat source term is calculated by the radiative transfer coefficients (RTCs), which are deduced by the ray tracing method in combination with Hottel and Sarofim’s zonal method (Hottel H. C., and Sarofim A. F., 1967, Radiative Transfer, McGraw-Hill Book Company, New Yo

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15

Neely, A. J., P. T. Ireland, and L. R. Harper. "Extended surface convective cooling studies of engine components using the transient liquid crystal technique." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 211, no. 3 (1997): 273–87. http://dx.doi.org/10.1243/0957650971537187.

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A heat transfer tunnel used for local convective heat transfer coefficient measurements on liquid crystal instrumented models is described. The tunnel uses the new mesh heater device to produce a good approximation to a step change in the test section flow temperature. A simple analytical model of the cooling performance of cylindrical extended surfaces is derived from empirical relations obtained from the literature. Experiments conducted on a smooth cylinder and selected cylindrical finned geometries are discussed. In the configurations investigated, the relative sizes of the fin diameter to

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16

Chen, Yuanyuan, Yiwei Chen, and Xuecheng Xu. "Thermal analysis on natural convection coupled with radiative heat transfer in a saturated porous cavity." Thermal Science, no. 00 (2021): 256. http://dx.doi.org/10.2298/tsci210309256c.

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Porous foam is an ideal material for enhancing radiative heat transfer in numerous thermal equipment. The solid skeletons of porous foams can absorb/ release radiative energy and transfer convective energy with the surrounding fluid in the pores. In this paper, the conduction-convection-radiation coupling heat transfer in a porous cavity is investigated. A local thermal nonequilibrium model is used to represent the energy transport during the solid and fluid phases. The heat flux caused by thermal radiation is obtained by solving the radiation transfer equation. The thermal and fluid fields ar

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17

Zhang, Chuanwei, Jing Huang, Weixin Sun, Xusheng Xu, and Yikun Li. "Research on the Influence of Liquid on Heat Dissipation and Heating Characteristics of Lithium-Ion Battery Thermal Management System." World Electric Vehicle Journal 13, no. 4 (2022): 68. http://dx.doi.org/10.3390/wevj13040068.

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A battery thermal management system (BTMS) with functions of heat dissipation and heating by using only one liquid and one structure was studied, and a design for a new type of thermal management device structure was proposed. To find the influence factors of the BTMS on heat dissipation and heating characteristics, we selected and simulated three parameters: inlet size, liquid flow rate, and temperature. The convective heat transfer coefficient h and the Nusselt number Nu were used to analyze the influence of inlet size and liquid velocity on heat transfer intensity. The results show that: (1

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18

Pribytkov, I. A., and S. I. Kondrashenko. "ON THE CALCULATION OF CONVECTIVE HEAT TRANSFER UNDER MUTUAL-ACTION OF A JET WITH LIMITING SURFACE." Izvestiya. Ferrous Metallurgy 62, no. 3 (2019): 208–14. http://dx.doi.org/10.17073/0368-0797-2019-3-208-214.

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The paper proposes a method for calculating convective heat transfer in the interaction of a single circular jet with a flat surface. The differences of the proposed method from the existing ones are given. The concepts “energodynamic potential of the flow” and “energodynamic power of the flow” are introduced, allowing to determine the intensity of convective heat transfer at “gas-solid” boundary. Differences of the proposed definitions from the existing ones are given: heat flux and heat flux density. The principal difference between the heat flux density q and the energy dynamic potential qэ

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19

Zhu, Aishi, and Kai Xia. "Dynamics of convective hot air drying of filiform Lagenaria siceraria." Chemical Industry and Chemical Engineering Quarterly 19, no. 4 (2013): 485–92. http://dx.doi.org/10.2298/ciceq120313082z.

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In this study, a laboratory convective hot air dryer was used for the thin-layer drying of filiform Lagenaria siceraria and the influences of the drying temperature and air velocity on the drying process were investigated. The drying temperature and the air velocity were varied in the range of 60-80?C and 0.6-1.04 m?s-1, respectively. The experimental data of moisture ratio of filiform Lagenaria siceraria were used to fit the mathematical models, and the dynamics parameters such as convective heat transfer coefficient ? and mass transfer coefficient kH were calculated. The results showed that

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20

Xing, Xianghai, Zhigen Wu, Yanping Du, Wei Lu, Yupeng Wu, and Zhibo Xiong. "Analytical Solution of Thermal Performance in Metal Foam Partially Filled Channel with Asymmetric Wall Heat Flux." Energies 18, no. 3 (2025): 505. https://doi.org/10.3390/en18030505.

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An analytical solution is conducted on forced convection in a metal foam partially filled plate channel under asymmetric heat flux conditions, with the aim of optimizing heat transfer performance. The Darcy–Brinkman model and the local thermal non-equilibrium (LTNE) model are employed to predict heat transfer characteristics under varying heat flux ratios (q1/q2). Key parameters such as the free zone height, pore density, and thermal conductivity ratio significantly influence heat transfer efficiency. The results indicate that the height of the free region has a greater impact on the flow dist

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21

Bailey, Stuart M. "Validation of convection-limited cooling for Electron Microscopy." Proceedings, annual meeting, Electron Microscopy Society of America 47 (August 6, 1989): 998–99. http://dx.doi.org/10.1017/s0424820100156973.

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Rapid freezing is a universal method of sample fixation for electron microscopy. Freeze-fracture replication, low temperature embedment and cryo-sectioning, and cryo-microscopy all depend on freezing specimens rapidly enough so that structure can be preserved unaltered. The most common method of rapid freezing is plunging specimens directly into liquid cryogens. In an earlier study, convection from the cryogen to the specimen was predicted to be the limiting step in rapid freezing of small samples for electron microscopy when the Biot modulus, (h V /kA) which determines the ratio of convective

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22

Sudhanshu, Pathak, and S. Sahu H. "CFD Analysis of Heat Transfer Enhancement in Shell and Tube Type Heat Exchanger creating Triangular Fin on the Tubes." International Journal of Trend in Scientific Research and Development 2, no. 4 (2019): 1161–70. https://doi.org/10.31142/ijtsrd14259.

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Shell and Tube heat exchangers are having special importance in boilers, oil coolers, condensers, pre heaters. Shell and Tube heat exchanger is one such heat exchanger, provides more area for heat transfer between two fluids in comparison with other type of heat exchanger. To intensify heat transfer with minimum pumping power innovative heat transfer fluids called Nano fluids have become the major area of research now a days. The primary aim is to evaluate the effect of different weight concentration and temperatures on convective heat transfer. Increasing the weight concentration and temperat

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23

Iasiello, M., G. M. Mauro, N. Bianco, A. Andreozzi, W. K. S. Chiu, and V. Naso. "An exhaustive search optimization of heat transfer and pressure drop in Kelvin’s open cell foams." Journal of Physics: Conference Series 2509, no. 1 (2023): 012014. http://dx.doi.org/10.1088/1742-6596/2509/1/012014.

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Abstract Thanks to their high effective thermal conductivity, specific surface area, and tortuosity, open-cell foams are well-known for their capability to enhance heat transfer in applications such as heat exchangers and volumetric solar air receivers. In the very recent years, innovative manufacturing techniques, including 3D designing and printing, have been looked very helpful to find foam morphologies that allow to maximize heat transfer and minimize pressure drop. Optimal foam structures can be obtained by means of pore-scale simulations, employing an exhaustive search with a bearable co

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Lemanov, V. V., M. A. Pakhomov, V. I. Terekhov, and Z. Travnicek. "Non-stationary convective heat transfer in an air synthetic impinging jet. Experiment and numerical simulation." Journal of Physics: Conference Series 2119, no. 1 (2021): 012024. http://dx.doi.org/10.1088/1742-6596/2119/1/012024.

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Abstract An unsteady local heat transfer in an air synthetic non-steady-state jet impingement onto a flat plate with a variation of the Reynolds number, nozzle-to-plate distance and pulses frequency is experimentally and numerically studied. Measurements of the averaged and pulsating heat transfer at the stagnation point are conducted using a heat flux sensor. The axisymmetric URANS method and the Reynolds stress model are used for numerical simulations. For local values of heat transfer, zones with the maximum instantaneous value of heat flux and heat transfer coefficient are identified. The

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Singh, Parampreet, Neel Kanth Grover, Vivek Agarwal, et al. "Computational Fluid Dynamics Analysis of Impingement Heat Transfer in an Inline Array of Multiple Jets." Mathematical Problems in Engineering 2021 (April 12, 2021): 1–10. http://dx.doi.org/10.1155/2021/6668942.

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Amid all convective heat transfer augmentation methods employing single phase, jet impingement heat transfer delivers significantly higher coefficient of local heat transfer. The arrangement leading to nine jets in square array has been used to cool a plate maintained at constant heat flux. Numerical study has been carried out using RANS-based turbulence modeling in commercial CFD Fluent software. The turbulent models used for the study are three different “k-ε” models (STD, RNG, and realizable) and SST “k-ω” model. The numerical simulation output is equated with the experimental results to fi

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Hayakawa, Yoshitaka, Daisuke Sato, and Noboru Yamada. "Measurement of the Convective Heat Transfer Coefficient and Temperature of Vehicle-Integrated Photovoltaic Modules." Energies 15, no. 13 (2022): 4818. http://dx.doi.org/10.3390/en15134818.

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To improve the thermal design of vehicle-integrated photovoltaic (VIPV) modules, this study clarifies the characteristics of the convective heat transfer coefficient h between the vehicle roof surface and the surrounding air with respect to vehicle speed. Experiments on two types of vehicles with different body shapes indicate that h is strongly affected by vehicle speed, and it is also affected by body shape depending on the position on the roof. Empirical equations for approximating h as a function of vehicle speed and position on the vehicle roof are derived from the experimental datasets,

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Al Dabagh, A. M., G. E. Andrews, R. A. A. Abdul Husain, C. I. Husain, A. Nazari, and J. Wu. "Impingement/Effusion Cooling: The Influence of the Number of Impingement Holes and Pressure Loss on the Heat Transfer Coefficient." Journal of Turbomachinery 112, no. 3 (1990): 467–76. http://dx.doi.org/10.1115/1.2927682.

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Measurements of the overall heat transfer coefficient within an impingement/effusion cooled wall are presented. The FLUENT CFD computer code has been applied to the internal aerodynamics to demonstrate the importance of internal recirculation in the impingement gap. This generates a convective heat transfer to the impingement jet. Measurements of this heat transfer plate coefficient are presented that show it to be approximately half of the impingement/effusion heat transfer coefficient. The influence of the relative pressure loss or X/D between the impingement and effusion walls was investiga

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Rakasiwi, Galih, Khoirudin Khoirudin, and Agus Supriyanto. "Experimental Study of Natural Convection Heat Transfer on A Vertical Cylinder with Varying Heat Flux." ROTASI 26, no. 3 (2024): 23–29. https://doi.org/10.14710/rotasi.26.3.23-29.

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The most commonly used heat transfer in cooling and heating systems is convective heat transfer. Natural convection heat transfer is typically employed in cooling systems with immersion cooling such as in data centers and transformers. In addition to cooling systems, natural convection is also utilized in heating systems as seen in nuclear reactors. More specifically, natural convection around heated cylinders has widespread applications. The flow of natural convection around vertical heated cylinders is a critical concern in various applications, including vertical tubes within HVAC systems,

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Singh, Prashant. "Errors Incurred in Local Convective Heat Transfer Coefficients Obtained through Transient One-Dimensional Semi-Infinite Conduction Modeling: A Computational Heat Transfer Study." Energies 15, no. 19 (2022): 7001. http://dx.doi.org/10.3390/en15197001.

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In typical turbulent flow problems, detailed heat transfer coefficient (h) maps obtained through short-duration experiments are based on inverse heat transfer methods that take the wall temperatures measured via liquid crystals or infrared thermography as input, and an error minimization routine is adopted to determine the best value of h that satisfies the wall temperature temporal evolution under a certain change in fluid temperature. A common practice involves modeling the solid as a one-dimensional semi-infinite medium by selecting the solid material that has low thermal conductivity and l

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Mafeed, M. P., Ali M. Salman, C. Prabin, M. K. Ramis, M. A. Ali Baig, and S. A. Khan. "Optimum Length for Pin Fins Used in Electronic Cooling." Applied Mechanics and Materials 110-116 (October 2011): 1667–73. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.1667.

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The present work deals with the heat transfer analysis of pin fins of various geometries namely ─ circular, triangular and rectangular and thus arrive at the optimum design. To this end, the fin with convective boundary tip is considered and the equation governing the one-dimensional heat conduction in the fin is solved analytically to obtain the temperature distribution and heat transfer rate. A computer code has been developed to generate results for wide range of parameters─ heat transfer coefficient h, thermal conductivity k, and length of the fin l. Results are plotted in the form of temp

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Yin, Tao, Deliang Ren, Xiao Ma, Yuanzhen Wei, Qiang Gao, and Xingchang Han. "Optimal Design and Multi-Parameter Sensitivity Analysis of a Segmented Thermoelectric Generator." Processes 11, no. 12 (2023): 3352. http://dx.doi.org/10.3390/pr11123352.

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Thermoelectric generators are high-profile energy conversion devices that can convert heat energy into electricity. In this study, a novel 1D resistance model was established to evaluate the performance of a segmented thermoelectric generator (STEG) with variable properties, and the genetic algorithm was adopted to optimize the performance. Then, influence factor analysis, multi-parameter optimization, and sensitivity analysis for an STEG couple were conducted. The results showed the great influence of geometric sizes on performance. Moreover, the optimal length ratio between the length of the

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Hassanian, Reza, Morris Riedel, Asdis Helgadottir, Nashmin Yeganeh, and Runar Unnthorsson. "Implicit Equation for Photovoltaic Module Temperature and Efficiency via Heat Transfer Computational Model." Thermo 2, no. 1 (2022): 39–55. http://dx.doi.org/10.3390/thermo2010004.

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This paper evaluates the photovoltaic (PV) module operating temperature’s relation to efficiency via a numerical heat transfer model. The literature reports that higher PV module operating temperatures impact PV module efficiency. There are dozens of explicit and implicit equations used to determine the PV module operating temperature. However, they are not universal, and for each application, it is necessary to insert a correction coefficient based on the environment and boundary conditions. Using a numerical method covering a more comprehensive range of PV module operation conditions to esti

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Röger, M. "A Periodic-Transient Method for High-Resolution Heat Transfer Measurement on Two-Dimensional Curved Surfaces." Journal of Heat Transfer 129, no. 12 (2007): 1638–54. http://dx.doi.org/10.1115/1.2767677.

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Abstract Measurement of heat transfer distribution is frequently required in engineering. However, some heat transfer techniques are not able to measure accurately on two-dimensional curved surfaces. In this field, periodic-transient measurement methods are advantageous. This paper describes the development of a periodic-transient technique for high-resolution heat transfer measurement and its application to multiple air-jet cooling of a concave solar receiver window. In contrast to other measurement techniques, the periodic-transient technique requires neither homogenous heating nor quantitat

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Ekkad, Srinath V., and Prashant Singh. "Liquid Crystal Thermography in Gas Turbine Heat Transfer: A Review on Measurement Techniques and Recent Investigations." Crystals 11, no. 11 (2021): 1332. http://dx.doi.org/10.3390/cryst11111332.

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Liquid Crystal Thermography is a widely used experimental technique in the gas turbine heat transfer community. In turbine heat transfer, determination of the convective heat transfer coefficient (h) and adiabatic film cooling effectiveness (η) is imperative in order to design hot gas path components that can meet the modern-day engine performance and emission goals. LCT provides valuable information on the local surface temperature, which is used in different experimental methods to arrive at the local h and η. The detailed nature of h and η through LCT sets it apart from conventional thermoc

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AUGUSTO, PEDRO E. D., TALITA FERRAMOLA PINHEIRO, and MARCELO CRISTIANINI. "DETERMINING CONVECTIVE HEAT TRANSFER COEFFICIENT (h) FOR HEATING AND COOLING OF BOTTLES IN WATER IMMERSION." Journal of Food Process Engineering 35, no. 1 (2010): 54–75. http://dx.doi.org/10.1111/j.1745-4530.2009.00571.x.

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Eneren, Pinar, Yunus Tansu Aksoy, and Maria Rosaria Vetrano. "Practical Challenges in Nanofluid Convective Heat Transfer Inside Silicon Microchannels." Energies 16, no. 23 (2023): 7885. http://dx.doi.org/10.3390/en16237885.

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Despite numerous studies on nanofluids in microchannel heat sinks (MCHSs), they are not yet commercialized due to long-term stability issues and high maintenance costs. Therefore, this study explores the impact of nanofluids and nanoparticle clustering on single-phase convective heat transfer inside microchannels under laminar conditions. Water and commercially available water-based nanosuspensions, including Al2O3-water (30–60 nm), TiO2-water (5–30 nm), and polystyrene-water (50 nm), are circulated through silicon MCHS having rectangular channels integrated into a closed flow loop. To assess

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Núñez González, J., A. Beltrán Morales, M. Rivero Corona, and J. Vega Munguía. "Numerical simulation of a polymer melting process using solar energy." Suplemento de la Revista Mexicana de Física 1, no. 2 (2020): 18–24. http://dx.doi.org/10.31349/suplrevmexfis.1.2.18.

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In this work, the melting process of a polymeric material is numerically investigated. In general, the heat required for melting plastics is obtained throughout electrical resistances or by burning fossil fuels. The heat transfer mechanisms of these common practices correspond to conduction and convection, respectively. This work explores the feasibility of using radiation as the primary mechanism of energy supply, which has not been widely studied. The energy to achieve the phase change from solid to liquid can be obtained by concentrated solar energy radiation. The total energy required is c

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Jeng, Tzer-Ming, Sheng-Chung Tzeng, and Zhi-Ting Yeh. "EXPERIMENTAL STUDY OF FREE CONVECTION HEAT TRANSFER IN THE POROUS METAL-FOAM HEAT SINK." Transactions of the Canadian Society for Mechanical Engineering 37, no. 3 (2013): 841–50. http://dx.doi.org/10.1139/tcsme-2013-0071.

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This study experimentally investigated the free convection heat transfer characteristics of the annular metal-foam heat sinks. The results showed that the heat transfer coefficient (h) decreased as the pore density of metal foams increased when the thickness (tc) of the annular metal foams equaled 5 mm, but the (h) increased as the pore density increased when tc = 11 and 14.5 mm. Besides, the (h) increased firstly and then decreased as (tc) increased. There was better heat transfer effect when tc = 11 mm in the present study.

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Yilbas, B. S., and M. Kalyon. "Parametric variation of the maximum surface temperature during laser heating with convective boundary conditions." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 216, no. 6 (2002): 691–700. http://dx.doi.org/10.1243/095440602320192337.

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Modelling of laser pulse heating of metallic substrates reduces the experimental cost and optimizes the laser heating parameters. In the present study, exponentially time-varying laser pulse heating with convective boundary conditions at the surface is considered. The closed-form solution for temperature distribution at the surface is presented. The effects of the heat transfer coefficient ( h∗) and pulse parameter (β∗) on the time corresponding to the maximum surface temperature ( t∗Tmax is significant for h∗≥0.02. Moreover, reducing the pulse parameter lowers t∗Tmax.

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MR., BANSODE RAHUL G., RAHUL K. MR.BHONG, BANSUDE AJAY R. MR., MISAL ROHIT V. MR., and DESHMUKH SONALI. A. PROF. "HEAT TRANSFER IN SPRAY QUENCHING." JournalNX - A Multidisciplinary Peer Reviewed Journal 3, no. 4 (2017): 196–98. https://doi.org/10.5281/zenodo.1454076.

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The focus of this experiment is to investigate the spray quenching characteristics and heat transfer rate of H-40 steel plate under a atmospheric conditions. Cooling of tool steel surfaces with flat nozzles was studied experimentally. The importance of coolant temperature on coefficient of heat transfer was investigated. Experiment test were performed with H-40 steel plate using two different method direct water deeping and air-water spray cooling(water and ethylene glycol). Experiments were conducted on an heated flat rotary steel plate of dimension 200 mm x 6 mm. The cooling rates were calcu

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Blaszczuk, Artur, and Szymon Jagodzik. "Heat transfer characteristics of an external tube heat exchanger in a 1296t/h circulating fluidized bed boiler." E3S Web of Conferences 137 (2019): 01014. http://dx.doi.org/10.1051/e3sconf/201913701014.

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In this research article, experimental study was carried out to obtain the heat transfer characteristics between a submerged horizontal tube bundle and a fluidized bed in a large-scale circulating fluidized bed (CFB) boiler with an external heat exchanger (EHE). The operational parameters in the tube EHE were measured during performance tests at variable load conditions. The average heat transfer coefficient (HTC) was calculated using a mechanistic heat transfer model based on packed renewal theory. The heat transfer characteristics are considered in terms of heat transfer mechanisms such as e

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Ario Geraldi and RR. Sri Poernomo Sari. "EFFECTS PARTICLES CONCENTRATION OF Al2O3 AND TiO2 TO CONVECTION COEFFICIENT ON DOUBLE PIPE HEAT EXCHANGER." Jurnal Ilmiah Teknik 1, no. 1 (2022): 01–08. http://dx.doi.org/10.56127/juit.v1i1.66.

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Heat exchanger is a device used to transfer heat energy from a fluid to in another fluid. Each fluid has different characteristics. Value of convection heat transfer is determined by the value of the convection heat transfer coefficient (h) which depends on the dimensions and flow conditions. The fluid with the additional of Al2O3 nanoparticles (aluminum oxide) and TiO2 (Titanium dioxide) has great potential for cooling applications. The purpose of this study was to analyze the effect of Al2O3 and TiO2 particle concentration on the value of the convection heat transfer coefficient in the doubl

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Radchenko, Yurii, Volodymyr Shevchenko, Serhii Oparin, Olena Gupalo, and Serhii Davydov. "The influence of initial parameters on the process of synthesis gases cooling during plasma-chemical processing of carbon-hydrogen containing raw materials." IOP Conference Series: Earth and Environmental Science 1491, no. 1 (2025): 012067. https://doi.org/10.1088/1755-1315/1491/1/012067.

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Abstract The paper investigates the influence of the productivity of plasma-chemical processing of carbon-hydrogen containing raw material and initial parameters of syngas on the performance of syngas cooler. The syngas cooler consists of a sequentially located radiation section, a preliminary convective section, a steam superheater, a main convective section, an economizer, and an autonomous water cooler. To determine the operating parameters of the syngas cooler, a well-known methodology based on the solution of heat transfer and heat balance equations was used. The main performance indicato

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Rikitu, Ebba Hindebu, and Oluwole Daniel Makinde. "Mixed Convection of Cu–H₂O Nanofluid in a Darcy–Forchheimer Porous Medium Microchannel with Thermal Radiation and Convective Heating." Journal of Nanofluids 12, no. 7 (2023): 1921–35. http://dx.doi.org/10.1166/jon.2023.2097.

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Heat transfer and convective flow of Cu–H2O nanofluid in a microchannel with thermal radiation has many attributes in engineering, industries, and biomedical sciences including cooling of electronics, drug delivery, cancer therapy, optics, missiles, satellites, and lubricants. Therefore, this paper aims to investigate the hydrodynamical behaviors and heat transfer characteristics of Cu–H2O nanofluid through a porous medium microchannel with thermal radiation and convective heating. The highly non-linear partial differential equations that govern the momentum and energy equations are formulated

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Tzeng, Sheng Chung, Tzer Ming Jeng, and Zhi Ting Yeh. "Natural Convection Heat Transfer of Annular Metal Porous Medium Heat Sink of LED." Applied Mechanics and Materials 284-287 (January 2013): 844–48. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.844.

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This study used metal porous medium heat sink to replace traditional cooling fins to form a high performance LED cooling system. The metal foamed material has high permeability and cooling area as large as several times of that of traditional fins. With a proper configuration design, it can improve the heat transfer capability of natural convection effectively. This study experimentally investigated the natural convection heat transfer characteristics of the annular metal foamed material, and determined the optimal configuration. The experimental results showed that 1) the heat transfer coeffi

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Jeng, Tzer Ming, and Sheng Chung Tzeng. "Detailed Measurements of End-Wall Heat Transfer Coefficients of Square Pin-Fin Heat Sink for LED Lamp at Forced Convective State." Applied Mechanics and Materials 284-287 (January 2013): 697–701. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.697.

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The device made of fan and pin-fin heat sink should be a powerful heat sink for LED lamp. This study used transient liquid crystal experimentation to measure the end-wall heat transfer coefficient of linearly arrayed square pin array in the rectangular channel, and discussed the influence of axial spacing on heat transfer. The air was used as operating fluid, and the square pin size was 8 mm (d) × 8 mm (d) × 64 mm (Hf), arrayed in a 240 mm (L) × 120 mm (W) × 64 mm (H) rectangular channel. The relative lateral spacing (XT=ST/d) was set as 3, and the relative axial spacing (XL=SL/d=1.88~5) and t

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Shareef, Amer Jameel, and Abdulmajeed A. Ramadhan. "Heat Transfer and Fluid Flow Characteristic in banks Flat Tubes." Tikrit Journal of Engineering Sciences 18, no. 4 (2011): 88–103. http://dx.doi.org/10.25130/tjes.18.4.10.

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In this research a study effect of the length ratio (L/Da) and the height ratio (H/Da) for banks flat tube heat exchanger In-Line and staggered arrangement on force convection heat transfer and friction coefficient by (Fluent-CFD) numerical program.The governing equations (mass, momentum and energy) are solving by using Finite Volume (Fluent-CFD) software for considering steady state, two dimensional, at constant heat flux with Reynold’s number (100≤Re≤8000).The results show that increasing (H/Da), (L/Da) lead to decreasing friction coefficient and enhancement of (Nu) is at (H/Da=2) for all (L

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Tikuisis, P., D. G. Bell, and I. Jacobs. "Shivering onset, metabolic response, and convective heat transfer during cold air exposure." Journal of Applied Physiology 70, no. 5 (1991): 1996–2002. http://dx.doi.org/10.1152/jappl.1991.70.5.1996.

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The onset and intensity of shivering of various muscles during cold air exposure are quantified and related to increases in metabolic rate and convective heat loss. Thirteen male subjects resting in a supine position and wearing only shorts were exposed to 10 degrees C air (42% relative humidity and less than 0.4 m/s airflow) for 2 h. Measurements included surface electromyogram recordings at six muscle sites representing the trunk and limb regions of one side of the body, temperatures and heat fluxes at the same contralateral sites, and metabolic rate. The subjects were grouped according to l

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Suvanjan Bhattacharyya. "3D CFD Simulation of Heat Transfer and Friction Characteristics of Laminar Flow of Water through a Circular Duct with Centre-Cleared Twin Twisted Tape." International Journal of Advanced Thermofluid Research 1, no. 2 (2015): 57–63. http://dx.doi.org/10.51141/ijatr.v1i2.12.

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Heat transfer behavior of laminar flow inside circular duct with centre-cleared twin twisted tape (CTTT) swirl generator was investigated numerically. The governing equations were solved with a finite-volume-based numerical method. A three-dimensional non uniform grid was generated, in order to critically examine the flow and heat transfer. The centre-cleared twin twisted tapes were tested in the current work; investigations were performed in the Reynolds number range of 100- 1,000 with four different CTTTs at twist ratio (TR) of H/W = 1.0, 2.0, 3.0 and 4.0. Water is used asworking fluid (Pr =

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Chen, Hao, Fangfang Lou, Xueyi Zhang, Chengjun Shen, Weicheng Pan, and Shuang Wang. "Hydrothermal Conversion of Microalgae Slurry in a Continuous Solar Collector with Static Mixer for Heat Transfer Enhancement." Energies 16, no. 24 (2023): 7986. http://dx.doi.org/10.3390/en16247986.

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The continuous solar collector is a promising heater and reactor for the hydrothermal liquefaction (HTL) of microalgae biomass. To enhance the heat transfer and hydrothermal conversion of microalgae slurry in solar-driven reactors, a static mixer is inserted in the flow channel of the solar collector. A numerical model combining CFD and HTL reactions of microalgae biomass is proposed. Six composition equations of protein, carbohydrates, lipids, biocrude, aqueous phase and biogas were proposed, while corresponding HTL kinetics were utilized to simulate the conversion rate of the reactants and p

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