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Journal articles on the topic 'Heat transfer mechanisms'

Author: Grafiati

Published: 4 June 2021

Last updated: 30 November 2024

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1

Roh, Heui-Seol. "Heat transfer mechanisms in solidification." International Journal of Heat and Mass Transfer 68 (January 2014): 391–400. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2013.09.034.

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2

Roh, Heui-Seol. "Heat transfer mechanisms in pool boiling." International Journal of Heat and Mass Transfer 68 (January 2014): 332–42. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2013.09.037.

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3

Gonzalez, Miguel, Brian Kelly, Yoshikazu Hayashi, and Yoon Jo Kim. "Heat transfer mechanisms in pulsating heat-pipes with nanofluid." Applied Physics Letters 106, no. 1 (January 5, 2015): 013906. http://dx.doi.org/10.1063/1.4905554.

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4

Wang, Songqing, Yuxuan Ji, Shijing He, Jing Gao, Yao Wang, and Xuelong Cai. "Study on heat transfer performance of a ground heat exchanger under different heat transfer mechanisms." Case Studies in Thermal Engineering 51 (November 2023): 103571. http://dx.doi.org/10.1016/j.csite.2023.103571.

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5

Bu, Chang-sheng, Dao-yin Liu, Xiao-ping Chen, Cai Liang, Yu-feng Duan, and Lun-bo Duan. "Modeling and Coupling Particle Scale Heat Transfer with DEM through Heat Transfer Mechanisms." Numerical Heat Transfer, Part A: Applications 64, no. 1 (July 2013): 56–71. http://dx.doi.org/10.1080/10407782.2013.772864.

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6

Melerus, Otto, and Wolfgang Mattmann. "Heat transfer mechanisms in gas fluidized beds. Part 1: Maximum heat transfer coefficients." Chemical Engineering & Technology 15, no. 3 (June 1992): 139–50. http://dx.doi.org/10.1002/ceat.270150302.

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7

SAKAI, Hideaki, Shigemitsu MARUNO, Shinji NATSUKAWA, Manabu OGURA, and Takayuki INOUE. "Science Education Support Class “Heat Transfer Mechanisms”." Journal of JSEE 59, no. 2 (2011): 11–15. http://dx.doi.org/10.4307/jsee.59.2_11.

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8

Rogachev, M. S., M. Yu Shtern, and Yu I. Shtern. "Mechanisms of Heat Transfer in Thermoelectric Materials." Nanobiotechnology Reports 16, no. 3 (May 2021): 308–15. http://dx.doi.org/10.1134/s2635167621030162.

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9

O'neill, Graham. "The caloric stimulus: mechanisms of heat transfer." British Journal of Audiology 29, no. 2 (January 1995): 87–94. http://dx.doi.org/10.3109/03005369509086585.

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10

Zelenko, V. L., and L. I. Kheifets. "Thermodynamic Way of Ranking Heat-Transfer Mechanisms." Russian Journal of Physical Chemistry A 93, no. 7 (July 2019): 1217–20. http://dx.doi.org/10.1134/s0036024419070343.

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11

Biedermann, Anja, Caroline Kudoke, Anne Merten, Edel Minogue, Udo Rotermund, Holger Seifert, Hans-Peter Ebert, Ulrich Heinemann, and Jochen Fricke. "Heat-transfer mechanisms in polyurethane rigid foam." High Temperatures-High Pressures 33, no. 6 (2001): 699–706. http://dx.doi.org/10.1068/htwu71.

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12

OHTA, HARUHIKO. "Heat Transfer Mechanisms in Microgravity Flow Boiling." Annals of the New York Academy of Sciences 974, no. 1 (October 2002): 463–80. http://dx.doi.org/10.1111/j.1749-6632.2002.tb05925.x.

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13

Mondal, Somenath, Sanyam Dangayach, and D. N. Singh. "Establishing Heat-Transfer Mechanisms in Dry Sands." International Journal of Geomechanics 18, no. 3 (March 2018): 06017024. http://dx.doi.org/10.1061/(asce)gm.1943-5622.0001083.

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14

Wong, Kaufui V., and Michael J. Castillo. "Heat Transfer Mechanisms and Clustering in Nanofluids." Advances in Mechanical Engineering 2 (January 2010): 795478. http://dx.doi.org/10.1155/2010/795478.

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15

Nakakuki, Atsushi. "Heat transfer mechanisms in liquid pool fires." Fire Safety Journal 23, no. 4 (January 1994): 339–63. http://dx.doi.org/10.1016/0379-7112(94)90003-5.

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16

Horacek, Bohumil, Kenneth T. Kiger, and Jungho Kim. "Single nozzle spray cooling heat transfer mechanisms." International Journal of Heat and Mass Transfer 48, no. 8 (April 2005): 1425–38. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2004.10.026.

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17

Thakur, Saee, Santosh Kadapure, Prasad Hegde, and Umesh Deshannavar. "A Review of Parameters and Mechanisms in Spray Cooling." Metallurgical and Materials Engineering 29, no. 3 (October 27, 2023): 36–64. http://dx.doi.org/10.56801/mme1016.

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Miniaturisation in avionics, electronics, and medical appliances has led to demands for rapid heat dissipation techniques. The spray cooling technique has gained importance recently due to its advantage over other cooling methods. Parameters affecting heat transfer mechanisms during spray cooling are contemplated. This review presents different heat transfer parameters and their effect on spray cooling by analysis from past studies. Heat transfer surface modifications and different coolant variations to enhance heat transfer effectiveness are also reviewed. Apart from high heat flux having more applications, low heat flux studies have also grabbed the researchers to find solutions with a temperature range lower than 250˚C. Therefore, the upcoming spray cooling technology will have broad applications that will contribute to the maximum efficiency of the heat removal rate.

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18

Gupta, Naveen Kumar, Arun Kumar Tiwari, and Subrata Kumar Ghosh. "Heat transfer mechanisms in heat pipes using nanofluids – A review." Experimental Thermal and Fluid Science 90 (January 2018): 84–100. http://dx.doi.org/10.1016/j.expthermflusci.2017.08.013.

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19

Torii, Shuichi, and Wen-Jei Yang. "Heat transfer mechanisms in thin film with laser heat source." International Journal of Heat and Mass Transfer 48, no. 3-4 (January 2005): 537–44. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2004.09.011.

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20

Vanierschot, Maarten, and Ashmore Mawire. "Heat-Transfer Mechanisms in a Solar Cooking Pot with Thermal Energy Storage." Energies 16, no. 7 (March 25, 2023): 3005. http://dx.doi.org/10.3390/en16073005.

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This paper presents a detailed analysis of the heat-transfer mechanisms in a solar cooking pot with thermal energy storage using computational fluid dynamics (CFD). The vast majority of studies on solar cookers have been experimentally performed using local temperature measurements with thermocouples. Therefore, the heat-transfer mechanisms can only be studied using lumped capacitance models as the detailed profiles of temperature and heat fluxes inside the cooker are missing. CFD is an alternative modelling technique to obtain this detailed information. In this study, sunflower oil is used as both cooking fluid and energy storage medium. Comparison of the model with the available experimental data shows that the deviation is within the measurement accuracy of the latter. Hence, despite some assumptions, such as axisymmetry and an estimation of the heat transfer parameters to the ambient, the model is able to describe the involved physical processes accurately. It is shown that, initially, the main heat-transfer mechanism is conduction from the cooker’s bottom towards the thermal energy storage (TES). This heats up the oil near the bottom of the TES, creating convective plumes, which significantly enhance the heat transfer. In equilibrium, about 79% of the incoming solar flux goes towards heating up the TES. The heat is further transferred to the pot, where convective plumes also appear much later in time. However, the heat transfer to the pot is much smaller, with an average heat-transfer coefficient of 1.6 Wm−2K−1 compared to 7.5 Wm−2K−1 for the TES. After two hours of charging, the oil reaches a temperature of 397 K in the TES and 396 K in the cooking pot. Moreover, the temperature distribution in the cooker is quasi-uniform. During the charging period, the storage efficiency of the TES is about 29%. With the results in this study, solar cooking pots with TES can be further optimized towards efficiently transmitting the heat form the solar radiation to the food to be cooked.

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21

Murray, D. B. "Local enhancement of heat transfer in a particulate cross flow—I Heat transfer mechanisms." International Journal of Multiphase Flow 20, no. 3 (June 1994): 493–504. http://dx.doi.org/10.1016/0301-9322(94)90023-x.

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22

Gobinath, Natarajan, and C. P. Karthikeyan. "Heating and Cooling Mechanisms of Nano Fluids: Experimental Investigation." Nano Hybrids and Composites 17 (August 2017): 44–54. http://dx.doi.org/10.4028/www.scientific.net/nhc.17.44.

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Heat transfer mechanisms and migration characteristics of volatile nanoparticles in a boiling fluid are complex phenomenon to understand. Boiling heat transfer mechanisms of the nanofluid (Al2O3/n-pentane) and migration characteristics of volatile Al2O3 nanoparticle are studied in this paper. Experiments were carried out using a sealed glass beaker partially filled with the nanofluid. Heat flux conditions and mass fractions of nanoparticles were varied to study the heat transfer mechanisms and migration characteristics of particles. Accuracy of experiments was checked using heat transfer correlations and repeated iterations. Also, in the present research, the solidification rate of pure water and water suspended with alumina nanoparticles is investigated to understand the freezing characteristics of nanofluids.

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23

Corumlu, Vahit, Ahmet Ozsoy, and Murat Ozturk. "Evaluation of Heat Transfer Mechanisms in Heat Pipe Charged with Nanofluid." Arabian Journal for Science and Engineering 44, no. 6 (February 12, 2019): 5195–213. http://dx.doi.org/10.1007/s13369-019-03742-9.

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24

Jo, Jaeyeong, Jungho Kim, and Sung Jin Kim. "Experimental investigations of heat transfer mechanisms of a pulsating heat pipe." Energy Conversion and Management 181 (February 2019): 331–41. http://dx.doi.org/10.1016/j.enconman.2018.12.027.

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25

Mirafiori, Matteo, Marco Tancon, Stefano Bortolin, Alessandro Martucci, and Davide Del Col. "Mechanisms of dropwise condensation on aluminum coated surfaces." Journal of Physics: Conference Series 2177, no. 1 (April 1, 2022): 012046. http://dx.doi.org/10.1088/1742-6596/2177/1/012046.

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Abstract Dropwise condensation (DWC) is a complex phase-change phenomenon involving the formation of randomly distributed droplets on the condensing surface. The promotion of DWC instead of the traditional filmwise condensation (FWC) is a promising solution to enhance the efficiency of heat exchangers by increasing the condensation heat transfer coefficient. The interaction between the condensing fluid and the surface (wettability) is important in defining the condensation mode. On metallic surfaces widely employed in heat transfer applications, the condensing process occurs in filmwise mode. Ideally, an engineered surface designed to achieve high DWC heat transfer coefficients should present low contact angle hysteresis and low thermal resistance. Among the different available techniques to modify the surface wettability, hybrid organic-inorganic sol-gel silica coatings functionalized with hydrophobic moieties (phenyl or methyl groups) have been identified as a feasible solution to promote DWC on metallic surfaces. In the present paper, different aluminum sol-gel coated surfaces have been tested during DWC of steam in saturated conditions. The realized coatings have been characterized by means of dynamic contact angles and coating thickness measurements. Condensation tests have been performed using a two-phase thermosyphon loop operating in steady-state conditions that allows visualization of the condensation process and simultaneous heat transfer measurements. Heat transfer coefficients have been measured by varying the heat flux, at 106 °C saturation temperature and with vapor velocity equal to 2.7 m s−1. A high-speed camera is used for the visualization of the DWC process.

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26

Molerus, Otto, and Wolfgang Mattmann. "Heat transfer mechanisms in gas fluidized beds. Part 3: Heat transfer in circulating fluidized beds." Chemical Engineering & Technology 15, no. 5 (October 1992): 291–94. http://dx.doi.org/10.1002/ceat.270150502.

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27

Xu, Xiaoxiao, Longda Teng, Wei Ran, Yue Wang, and Chao Liu. "A review of heat transfer deterioration mechanisms and mitigation strategies of supercritical CO2 heat transfer." International Journal of Heat and Fluid Flow 109 (October 2024): 109534. http://dx.doi.org/10.1016/j.ijheatfluidflow.2024.109534.

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28

Kandlikar, Satish G. "Heat Transfer Mechanisms During Flow Boiling in Microchannels." Journal of Heat Transfer 126, no. 1 (February 1, 2004): 8–16. http://dx.doi.org/10.1115/1.1643090.

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The forces due to surface tension and momentum change during evaporation, in conjunction with the forces due to viscous shear and inertia, govern the two-phase flow patterns and the heat transfer characteristics during flow boiling in microchannels. These forces are analyzed in this paper, and two new nondimensional groups, K1 and K2, relevant to flow boiling phenomenon are derived. These groups are able to represent some of the key flow boiling characteristics, including the CHF. In addition, a mechanistic description of the flow boiling phenomenon is presented. The small hydraulic dimensions of microchannel flow passages present a large frictional pressure drop in single-phase and two-phase flows. The small hydraulic diameter also leads to low Reynolds numbers, in the range 100–1000, or even lower for smaller diameter channels. Such low Reynolds numbers are rarely employed during flow boiling in conventional channels. In these low Reynolds number flows, nucleate boiling systematically emerges as the dominant mode of heat transfer. The high degree of wall superheat required to initiate nucleation in microchannels leads to rapid evaporation and flow instabilities, often resulting in flow reversal in multiple parallel channel configuration. Aided by strong evaporation rates, the bubbles nucleating on the wall grow rapidly and fill the entire channel. The contact line between the bubble base and the channel wall surface now becomes the entire perimeter at both ends of the vapor slug. Evaporation occurs at the moving contact line of the expanding vapor slug as well as over the channel wall covered with a thin evaporating film surrounding the vapor core. The usual nucleate boiling heat transfer mechanisms, including liquid film evaporation and transient heat conduction in the liquid adjacent to the contact line region, play an important role. The liquid film under the large vapor slug evaporates completely at downstream locations thus presenting a dryout condition periodically with the passage of each large vapor slug. The experimental data and high speed visual observations confirm some of the key features presented in this paper.

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29

Sule, Idris O., Shohel Mahmud, Animesh Dutta, and Syeda Humaira Tasnim. "Heat transfer mechanisms in poplar wood undergoing torrefaction." Heat and Mass Transfer 52, no. 3 (April 17, 2015): 421–28. http://dx.doi.org/10.1007/s00231-015-1558-7.

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30

Afanasiev, V. N., Yadot P. Chudnovsky, and A. I. Leontiev. "Experimental study of vortex heat-transfer enhancement mechanisms." Experimental Thermal and Fluid Science 7, no. 2 (August 1993): 137. http://dx.doi.org/10.1016/0894-1777(93)90150-h.

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31

Donoghue, D. B., A. Albadawi, Y. M. C. Delauré, A. J. Robinson, and D. B. Murray. "Bubble impingement and the mechanisms of heat transfer." International Journal of Heat and Mass Transfer 71 (April 2014): 439–50. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2013.12.014.

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32

Meng, Boyan, Wenxing Luo, Guifan Chen, and Xiaoxiao Zhang. "Numerical modeling of borehole thermal energy storage in unsaturated soils." Journal of Physics: Conference Series 2835, no. 1 (August 1, 2024): 012065. http://dx.doi.org/10.1088/1742-6596/2835/1/012065.

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Abstract Borehole Thermal Energy Storage (BTES) in unsaturated soils offers advantages such as enhanced heat storage efficiency and widespread accessibility. However, the complex heat and mass transfer mechanisms and their impact on BTES performance necessitate further investigation. In this study, a componential two-phase heat transfer and fluid flow model was employed to examine the key mechanisms impacting the heat storage performance of a soil BTES system. Simulated results reveal that changes in soil thermal and hydraulic properties due to heat injection may significantly affect the heat transfer mechanisms and heat storage performance of the system. In particular, strong convective heat transfer may cause a reduction in heat storage efficiency. Comparison with results from the heat conduction model demonstrates the effectiveness of the modeling approach, especially when drying out occurs. The findings of this study can inform the design of soil BTES systems.

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33

Tzeng, S. C., Wei Ping Ma, C. H. Liu, Wen Yuh Jywe, and Yung Cheng Wang. "Mechanisms of Heat Transfer in Rotary Shaft of Rotating Machine with Nano-Sized Particles Lubricant." Materials Science Forum 505-507 (January 2006): 31–36. http://dx.doi.org/10.4028/www.scientific.net/msf.505-507.31.

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This study presents an analysis of surfactant added by CuO and Al2O3 nano-sized particles of different percentages. After adding suspending nanocrystalline particles into lubricant of machines, the nano-sized particles will augment the heat transfer characteristics of fluids. Some former studies showed that such liquids pose a great potential for heat transfer enhancement. By applying nanofluids to heat transfer of machine lubricant, this paper attempts to explore dominating factors of heat transfer performance from various weight concentrations of nano-sized particles, the correlation among wall temperature, heat flux, rotational Reynolds number, Nusselt number, Grashof number and rotational Grashof number of four different concentrations. The results show that nano-sized particle lubricant offer a better heat transfer performance than typical lubricants. Since random movement and diffusing effect of nano-sized particles are one crucial factor for an increased heat transfer coefficient, adding 3.5% weight concentration nano-sized particle lubricant will produce an optimum heat transfer performance among Case I~IV.

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34

Zhang, Junqiang, Zhengping Zou, and Chao Fu. "A Review of the Complex Flow and Heat Transfer Characteristics in Microchannels." Micromachines 14, no. 7 (July 19, 2023): 1451. http://dx.doi.org/10.3390/mi14071451.

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Continuously improving heat transfer efficiency is one of the important goals in the field of energy. Compact heat exchangers characterized by microscale flow and heat transfer have successfully provided solutions for this purpose. However, as the characteristic scale of the channels decreases, the flow and heat transfer characteristics may differ from those at the conventional scale. When considering the influence of scale effects and changes in special fluid properties, the flow and heat transfer process becomes more complex. The conclusions of the relevant studies have not been unified, and there are even disagreements on some aspects. Therefore, further research is needed to obtain a sufficient understanding of flow structure and heat transfer mechanisms in microchannels. This article systematically reviews the research about microscale flow and heat transfer, focusing on the flow and heat transfer mechanisms in microchannels, which is elaborated in the following two perspectives: one is the microscale single-phase flow and heat transfer that only considers the influence of scale effects, the other is the special heat transfer phenomena brought about by the coupling of microscale flow with special fluids (fluid with phase change (pseudophase change)). The microscale flow and heat transfer mechanisms under the influence of multiple factors, including scale effects (such as rarefaction, surface roughness, axial heat conduction, and compressibility) and special fluids, are investigated, which can meet the specific needs for the design of various microscale heat exchangers.

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35

SABATINO, D. R., and C. R. SMITH. "Turbulent spot flow topology and mechanisms for surface heat transfer." Journal of Fluid Mechanics 612 (October 10, 2008): 81–105. http://dx.doi.org/10.1017/s0022112008002838.

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The properties of artificially initiated turbulent spots over a heated plate were investigated in a water channel. The instantaneous velocity field and surface Stanton number were simultaneously established using a technique that combines particle image velocimetry and thermochromic liquid crystal thermography. Several characteristics of a spot are found to be similar to those of a turbulent boundary layer. The spacing of the surface heat transfer streak patterns within the middle or ‘body’ of a turbulent spot are comparable to the low-speed streak spacing within a turbulent boundary layer. Additionally, the surface shear stress in the same region of a spot is also found to be comparable to a turbulent boundary layer. However, despite these similarities, the heat transfer within the spot body is found to be markedly less than the heat transfer for a turbulent boundary layer. In fact, the highest surface heat transfer occurs at the trailing or calmed region of a turbulent spot, regardless of maturity. Using a modified set of similarity coordinates, instantaneous two-dimensional streamlines suggest that turbulent spots entrain and subsequently recirculate warm surface fluid, thereby reducing the effective heat transfer within the majority of the spot. It is proposed that energetic vortices next to the wall, near the trailing edge of the spot body, are able to generate the highest surface heat transfer because they have the nearest access to cooler free-stream fluid.

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36

Eneren, Pinar, Yunus Tansu Aksoy, and Maria Rosaria Vetrano. "Experiments on Single-Phase Nanofluid Heat Transfer Mechanisms in Microchannel Heat Sinks: A Review." Energies 15, no. 7 (March 30, 2022): 2525. http://dx.doi.org/10.3390/en15072525.

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For more than 20 years, the use of nanofluids to enhance heat transfer in microchannel heat sinks (MCHSs) has been the subject of a large number of scientific articles. Despite the great potentialities reported in several works, the presence of controversial results and the lack of understanding of heat transfer enhancement mechanisms prevent further advancement in the use of nanofluids as coolants. This article reviews the scientific literature focused on several aspects of nanofluids that have a role in the heat transfer enhancement within the MCHSs: nanofluid stability, thermal conductivity, and particle clustering, as well as the particle–surface interactions, i.e., abrasion, erosion, and corrosion. We also include the most relevant works on the convective heat transfer and MCHSs operated with nanofluids in our review.

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37

Kim, T., H. P. Hodson, and T. J. Lu. "Pressure loss and heat transfer mechanisms in a lattice-frame structured heat exchanger." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 218, no. 11 (November 1, 2004): 1321–36. http://dx.doi.org/10.1177/095440620421801104.

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A novel heat exchanger medium, a high-porosity (0.938) lattice-frame material (LFM), has been introduced for possible use in mechanically and thermally loaded heat exchanger applications. The LFM is made up of circular cylinders, forming tetrahedral unit cells. This paper describes the results of experiments and numerical simulation leading to a detailed understanding of the flow structure, pressure loss and heat transfer mechanisms. It is shown that the circular LFM struts are responsible for approximately 85 per cent of the overall pressure losses in the unit cell by means of form drag at high Reynolds number. The LFM causes heat removal from the substrate by promoting flow mixing and also contributes to the overall heat transfer by convection from the strut surfaces. If a high thermal conductivity material is used, the strut and substrate contribute 57 and 43 per cent respectively of the total heat transfer. Steady numerical simulations show that a porosity of approximately 0.8 provides the best heat transfer performance for a fixed mass flowrate. However, the pressure loss monotonically increases as the porosity decreases within a range of porosity, 0.7 ≤ ε ≤ 0.938.

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38

Aguilar, G., K. Gasljevic, and E. F. Matthys. "Coupling Between Heat and Momentum Transfer Mechanisms for Drag-Reducing Polymer and Surfactant Solutions." Journal of Heat Transfer 121, no. 4 (November 1, 1999): 796–802. http://dx.doi.org/10.1115/1.2826068.

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Drag-reducing solutions exhibit simultaneous friction and heat transfer reductions, yet it has been widely believed that there is no direct coupling between the two. In this work, we have conducted a study to re-examine this issue, using measurements of friction and heat transfer over a wide range of flow conditions from onset to asymptotic, various pipe diameters, and several polymer and surfactant solutions. Contrary to some earlier suggestions, our tests show that no decoupling of the momentum and heat transfer mechanisms was seen at the onset of drag reduction, nor upon departure from the asymptotes, but rather that the friction and heat transfer reductions change simultaneously in those regions. For asymptotic surfactant and polymer solutions, the ratio of heat transfer and drag reductions was seen to be constant over a large range of Reynolds numbers, if modified definitions of the reduction parameters are used. In the nonasymptotic region, however, the ratio of heat transfer to drag reductions is higher and is a function of the reduction level, but is approximately the same for polymer and surfactant solutions. This variation is consistent with the concept of a direct coupling through a nonunity constant Prt, as also suggested by our local measurements of temperature and velocity profiles. We also saw that our diameter scaling technique for friction applies equally well to heat transfer. These findings allow us to predict directly the heat transfer from friction measurements or vice versa for these drag-reducing fluids, and also suggest that a strong coupling exists between the heat and momentum transfer mechanisms.

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39

Ammerman, C. N., and S. M. You. "Determination of the Boiling Enhancement Mechanism Caused by Surfactant Addition to Water." Journal of Heat Transfer 118, no. 2 (May 1, 1996): 429–35. http://dx.doi.org/10.1115/1.2825862.

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In the present investigation, boiling heat transfer coefficients are measured for an electrically heated 390-μm-dia, platinum wire immersed in saturated water, and in water mixed with three different concentrations of sodium dodecyl sulfate (an anionic surfactant). The addition of a surfactant to water is known to enhance boiling heat transfer. A recently developed photographic/laser-Doppler anemometry measurement technique is used to quantify the vapor volumetric flow rate departing from the wire during the boiling process. The volumetric flow rate data are used to calculate the latent heat and, indirectly, the convection heat transfer mechanisms that constitute the nucleate boiling heat flux. Comparisons are made to determine how the heat transfer mechanisms are affected by the surfactant addition, and thus, which mechanism promotes boiling enhancement. The present data are also compared with similar data taken for a 75-μm-dia wire immersed in saturated FC-72 (a highly wetting liquid) to provide increased insight into the nature of the boiling heat transfer mechanisms.

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40

Singh, Jodh, Munish Gupta, Rajesh Kumar, and Harmesh Kumar. "Heat Transfer using Nanofluid." International Journal of Engineering and Advanced Technology 9, no. 2 (December 30, 2019): 3205–11. http://dx.doi.org/10.35940/ijeat.b9230.129219.

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Latest trend of miniaturization of thermal systems, calls for the improvement in their efficiency. Nanofluid contains the nanoparticles having large surface area and improves the thermal efficiency. This enhancement is the function of different mechanisms and parameter. This paper explores the heat transfer nature of nanofluids by addressing the experimental studies available in literature and conducting an experimental study using water based Copper oxide nanofluids. Nanoparticles were characterized by X-ray diffraction analysis and Field Emission Scanning Electron Microscopy to confirm the material, size and morphology of the nanoparticles. Thermal conductivity analysis has been performed at 30˚C, 40˚Cand 50˚C with 0.1%,0.5% and 1% concentration by weight. Mechanism of agglomeration, concentration and size of particles are found to be more significant in affecting the heat transfer. The maximum enhancement of 22.9 % in thermal conductivity is found in case of 1% weight concentration nanofluids consisting of small size (20nm) nanoparticles at temperature of 50˚C.

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41

Wang, Li Jun, Xiao Ping Miao, Rui Hai Wang, Wei Hua Li, Jun Yang, Yong Li, Feng Jiang, and Xiao Feng Zhou. "The Systems Emulation Study of the Dynamic Heat Load for Underground Structure Envelope." Applied Mechanics and Materials 291-294 (February 2013): 1847–50. http://dx.doi.org/10.4028/www.scientific.net/amm.291-294.1847.

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Whether the results of the dynamic heat flux from the underground engineering envelope are accurate, may influence the accuracy of calculating the transient heat load and could affect the initial cost and actual operation of the air-conditioning system in the underground engineering. The paper is to find out the mechanisms of the heat transfer in the underground engineering envelope. The mechanisms of heat transfer in normal underground engineering envelope, simplified calculation for heat transfer in the underground engineering envelope and the dynamic emulation of the heat load of the underground engineering envelope.

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42

He, Ni, Chaoyang Liu, Yu Pan, and Jian Liu. "Progress of Coupled Heat Transfer Mechanisms of Regenerative Cooling System in a Scramjet." Energies 16, no. 3 (January 17, 2023): 1025. http://dx.doi.org/10.3390/en16031025.

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The feasibility of regenerative cooling technology in scramjet engines has been verified, while the heat transfer behavior involved in the process needs further study. This paper expounds on the necessity of coupled heat-transfer analysis and summarizes its research progress. The results show that the effect of pyrolysis on heat transfer in the cooling channel depends on the heat flux and coking rate, and the coupling relationship between combustion and heat transfer is closely related to the fuel flow rate. Therefore, we confirm that regulating the cooling channel layout according to the real heat-flux distribution, suppressing coking, and accurately controlling the fuel flow rate can contribute to accomplishing the optimal collaborative design of cooling performance and combustion performance. Finally, a conjugate thermal analysis model can be used to evaluate the performance of various thermal protection systems.

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Oreshina, A. V., and B. V. Somov. "Heat-transfer mechanisms in solar flares. 1: Classical and anomalous heat conduction." Moscow University Physics Bulletin 66, no. 3 (June 2011): 286–91. http://dx.doi.org/10.3103/s0027134911030167.

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Oreshina, A. V., and B. V. Somov. "Heat-transfer mechanisms in solar flares. 2: Consideration of heat-flux relaxation." Moscow University Physics Bulletin 66, no. 3 (June 2011): 292–97. http://dx.doi.org/10.3103/s0027134911030179.

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Jung, Chuljae, and Sung Jin Kim. "Effects of oscillation amplitudes on heat transfer mechanisms of pulsating heat pipes." International Journal of Heat and Mass Transfer 165 (February 2021): 120642. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2020.120642.

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Kupiec, Krzysztof, and Monika Gwadera. "Heat Balance of Horizontal Ground Heat Exchangers." Ecological Chemistry and Engineering S 25, no. 4 (December 1, 2018): 537–48. http://dx.doi.org/10.1515/eces-2018-0035.

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Abstract This work refers to the modelling of heat transfer in horizontal ground heat exchangers. For different conditions of collecting heat from the ground and different boundary condition profiles of temperature in the ground were found, and temporal variations of heat flux transferred between the ground surface and its interior were determined. It was taken into account that this flux results from several different mechanisms of heat transfer: convective, radiative, and that connected with moisture evaporation. It was calculated that ground temperature at great depths is greater than the average annual ambient temperature.

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Fernandes, N. J., T. L. Bergman, and G. Y. Masada. "Thermal Effects During Infrared Solder Reflow—Part I: Heat Transfer Mechanisms." Journal of Electronic Packaging 114, no. 1 (March 1, 1992): 41–47. http://dx.doi.org/10.1115/1.2905440.

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An experimental study has been conducted to reveal the relevant heat transfer mechanisms which exist within an infrared reflow oven. Simulated card assemblies are used and their transient thermal responses, induced by combined radiative and convective heating, are measured. A simple numerical model is developed with which relevant heat transfer mechanisms are identified and quantified. The study shows that radiative and mixed convective heat transfer processes induce a variety of system thermal responses. Model predictions, which incorporate measured forced convection heat transfer coefficients and accurate descriptions of surface-to-surface radiative exchange, are in excellent agreement with experimental data for cases where the thermally induced buoyancy forces within the oven air are relatively small. The results of the experimental and analytical study provide guidelines for the development of more sophisticated models of the infrared reflow process.

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Shi, Li, and Arunava Majumdar. "Thermal Transport Mechanisms at Nanoscale Point Contacts." Journal of Heat Transfer 124, no. 2 (July 27, 2001): 329–37. http://dx.doi.org/10.1115/1.1447939.

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We have experimentally investigated the heat transfer mechanisms at a 90±10 nm diameter point contact between a sample and a probe tip of a scanning thermal microscope (SThM). For large heated regions on the sample, air conduction is the dominant tip-sample heat transfer mechanism. For micro/nano devices with a submicron localized heated region, the air conduction contribution decreases, whereas conduction through the solid-solid contact and a liquid meniscus bridging the tip-sample junction become important, resulting in the sub-100 nm spatial resolution found in the SThM images. Using a one dimensional heat transfer model, we extracted from experimental data a liquid film thermal conductance of 6.7±1.5 nW/K. Solid-solid conduction increased linearly as contact force increased, with a contact conductance of 0.76±0.38W/m2-K-Pa, and saturated for contact forces larger than 38±11 nN. This is most likely due to the elastic-plastic contact between the sample and an asperity at the tip end.

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Brewster, M. Quinn, Todd A. Sheridan, and Atsushi Ishiharat. "Ammonium nitrate-magnesium propellant combustion and heat transfer mechanisms." Journal of Propulsion and Power 8, no. 4 (July 1992): 760–69. http://dx.doi.org/10.2514/3.23547.

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Biedermann, A., C. Kudoke, A. Merten, E. Minogue, U. Rotermund, H. P. Ebert, U. Heinemann, J. Fricke, and H. Seifert. "Analysis of Heat Transfer Mechanisms in Polyurethane Rigid Foam." Journal of Cellular Plastics 37, no. 6 (November 2001): 467–83. http://dx.doi.org/10.1106/kemu-lh63-v9h2-kfa3.

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