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Journal articles on the topic 'Parallel heat flux'

Author: Grafiati

Published: 8 June 2024

Last updated: 31 July 2025

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1

Jing, Tingting, Guoqiang He, Fei Qin, Wenqiang Li, Duo Zhang, and Minghao Wang. "Flow Distribution Characteristics of Supercritical Hydrocarbon Fuel in Parallel Channels with Pyrolysis." Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 37, no. 1 (2019): 1–6. http://dx.doi.org/10.1051/jnwpu/20193710001.

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Due to the asymmetric geometry of flowpath and combustion organization, the heat flux distribution on RBCC's walls are extremely non-uniform. With a validated numerical model considering the changes of thermophysical properties and chemical components, the present study analyzed the effects of heat flux intensity, non-uniformity of heat flux distribution and inlet manifold on the mass flow distribution of parallel regenerative cooling channels. Results show that the intensity of heat flux enlarges the non-uniformity of parallel channels, however, the non-uniformity is reduced when the outlet t

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2

Zhang, Donghui, Haiyang Xu, Yi Chen, et al. "Boiling Heat Transfer Performance of Parallel Porous Microchannels." Energies 13, no. 11 (2020): 2970. http://dx.doi.org/10.3390/en13112970.

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Flow boiling in microporous layers has attracted a great deal of attention in the enhanced heat transfer field due to its high heat dissipation potential. In this study, flow boiling experiments were performed on both porous microchannels and a copper-based microchannel, using water as the coolant. As the heat flux was less than 80 W/cm2, the porous microchannels presented significantly higher boiling heat transfer coefficients than the copper-based microchannel. This was closely associated with the promotion of the nucleation site density of the porous coating. With the further increase in he

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3

Shakier, Raed, Hussam Muhammed, Hussain Khathem, and Haider Abdul-Khathem. "Two-Phase Flow In Mini-Scale Complex Geometry." Al-Kitab Journal for Pure Sciences 1, no. 1 (2018): 20–26. http://dx.doi.org/10.32441/kjps.v1i1.88.

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Heat-transfer coefficients are reported for one surface, a plain surface, with 50 mm square base area. Parallel channel test piece has one mm by one mm, 25 channelsThe data were produced while boiling R113 at atmospheric pressure. For this surface, the mass flux range was 200 – 600 kg/m2s and the heat flux range was 5 - 80 kW/m2. The results obtained have been compared with standard correlations for tube bundles. The measured heat-transfer coefficients for the parallel micro-channel surface are slightly bigger for any plate channel surface. It is dependent on heat flux and reasonably independe

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4

Kuznetsov, Vladimir, Alisher Shamirzaev, and Alexander Mordovskoy. "High heat flux flow boiling of refrigerant R236fa in parallel microchannels." EPJ Web of Conferences 196 (2019): 00062. http://dx.doi.org/10.1051/epjconf/201919600062.

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This paper presents the results of an experimental study of the heat transfer during flow boiling of refrigerant R236fa in a horizontal microchannel heat sink. The experiments were performed using closed loop that re-circulates coolant. Microchannel heat exchanger that contains two microchannels with 2x0.4 mm cross-section was used as the test section. The dependence of average heat flux on wall superheat and critical heat flux were measured in the range of mass fluxes from 600 to 1600 kg/m2s and in the range of heat fluxes from 5 to 120 W/cm2. For heat flux greater than 60 W/cm2, nucleate boi

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Salman, Yasin K., and Hazim S. Hamad. "LAMINAR NATURAL CONVECTION HEAT TRANSFER BETWEEN DUCTED PARALLEL PLATES." Journal of Engineering 14, no. 03 (2008): 2786–803. http://dx.doi.org/10.31026/j.eng.2008.03.18.

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Laminar natural convection heat transfer to air flow in a ducted two parallel plates subjected to same constant heat flux has been studied experimentally. In this study a test rig has been designed and constructed to allow studying the effect of plate spacing and plates angle of inclination on the heat transfer process. The study covers three plate spacing 15 mm, 35mm and 60 mm that makes plate aspect ratio (AR) 24, 10.285 and 6, The heat flux implemented in all test runs varies between 55 W/m2– 340 W/m2 that makes the modified Rayleigh number (Ra) varies from 105-108. Experimental results pre

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Barghouthi, I. A., H. Nilsson, and S. H. Ghithan. "O<sup>+</sup> and H<sup>+</sup> ion heat fluxes at high altitudes and high latitudes." Annales Geophysicae 32, no. 8 (2014): 1043–57. http://dx.doi.org/10.5194/angeo-32-1043-2014.

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Abstract. Higher order moments, e.g., perpendicular and parallel heat fluxes, are related to non-Maxwellian plasma distributions. Such distributions are common when the plasma environment is not collision dominated. In the polar wind and auroral regions, the ion outflow is collisionless at altitudes above about 1.2 RE geocentric. In these regions wave–particle interaction is the primary acceleration mechanism of outflowing ionospheric origin ions. We present the altitude profiles of actual and "thermalized" heat fluxes for major ion species in the collisionless region by using the Barghouthi m

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7

Guo, Zeng-Yuan, and Xiao-Bo Wu. "Thermal Drag and Critical Heat Flux for Natural Convection of Air in Vertical Parallel Plates." Journal of Heat Transfer 115, no. 1 (1993): 124–29. http://dx.doi.org/10.1115/1.2910637.

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Variable property effects on vertical channel natural convection in air are studied systematically. Numerical solutions of the governing equations show that both the mass flow rate and heat transfer in the channel are not only lower than the constant property results, but also show a nonmonotonic variation with increasing wall temperature or wall heat flux. This phenomenon, which seemingly conflicts with the conventional knowledge, has also been identified by experiments. For a vertical channel with a uniform heat flux boundary condition, the wall may experience a sharp rise in temperature up

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8

Zhang, Xiao Jing, Bing Qi Liu, Xiao Jie Xu, Xi Wu, and Rui Ming Yuan. "A Study of the Enhancement in Near-Field Radiative Heat Transfer by Surface Polaritons." Applied Mechanics and Materials 448-453 (October 2013): 3211–16. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.3211.

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The influence of surface polaritons on spectral energy flux at different temperatures or distances to the surface of a plate was analyzed. The relations of the net heat flux between two parallel plates with the material type were also discussed. The results demonstrate that the effect of surface polaritons is dominated in the spectral energy flux at 300 K when the distance is decreased to 100 nm. In addition, the intensity of surface polaritons increases with the temperature. The net heat flux between two parallel plates has a nearly linear relation with the temperature and is closely related

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9

Bergles, A. E., and S. G. Kandlikar. "On the Nature of Critical Heat Flux in Microchannels." Journal of Heat Transfer 127, no. 1 (2005): 101–7. http://dx.doi.org/10.1115/1.1839587.

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The critical heat flux (CHF) limit is an important consideration in the design of most flow boiling systems. Before the use of microchannels under saturated flow boiling conditions becomes widely accepted in cooling of high-heat-flux devices, such as electronics and laser diodes, it is essential to have a clear understanding of the CHF mechanism. This must be coupled with an extensive database covering a wide range of fluids, channel configurations, and operating conditions. The experiments required to obtain this information pose unique challenges. Among other issues, flow distribution among

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Li, Fuqin, William P. Kustas, John H. Prueger, Christopher M. U. Neale, and Thomas J. Jackson. "Utility of Remote Sensing–Based Two-Source Energy Balance Model under Low- and High-Vegetation Cover Conditions." Journal of Hydrometeorology 6, no. 6 (2005): 878–91. http://dx.doi.org/10.1175/jhm464.1.

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Abstract Two resistance network formulations that are used in a two-source model for parameterizing soil and canopy energy exchanges are evaluated for a wide range of soybean and corn crop cover and soil moisture conditions during the Soil Moisture–Atmosphere Coupling Experiment (SMACEX). The parallel resistance formulation does not consider interaction between the soil and canopy fluxes, whereas the series resistance algorithms provide interaction via the computation of a within-air canopy temperature. Land surface temperatures were derived from high-resolution Landsat Thematic Mapper (TM)/En

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Zenteno-Quinteros, Bea, Adolfo F. Viñas, and Pablo S. Moya. "Skew-kappa Distribution Functions and Whistler Heat Flux Instability in the Solar Wind: The Core-strahlo Model." Astrophysical Journal 923, no. 2 (2021): 180. http://dx.doi.org/10.3847/1538-4357/ac2f9c.

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Abstract Electron velocity distributions in the solar wind are known to have field-aligned skewness, which has been characterized by the presence of secondary populations such as the halo and strahl. Skewness may provide energy for the excitation of electromagnetic instabilities, such as the whistler heat flux instability (WHFI), which may play an important role in regulating the electron heat flux in the solar wind. Here we use kinetic theory to analyze the stability of the WHFI in a solar-wind-like plasma where solar wind core, halo, and strahl electrons are described as a superposition of t

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12

Fundamenski, W. "Parallel heat flux limits in the tokamak scrape-off layer." Plasma Physics and Controlled Fusion 47, no. 11 (2005): R163—R208. http://dx.doi.org/10.1088/0741-3335/47/11/r01.

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13

Wu, H. Y., and Ping Cheng. "Boiling instability in parallel silicon microchannels at different heat flux." International Journal of Heat and Mass Transfer 47, no. 17-18 (2004): 3631–41. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2004.04.012.

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14

Torii, Shuichi, and Wen-Jei Yang. "Thermal-Fluid Transport Phenomena of a Strongly-Heated Gas Flow in Parallel Tube Rotation." International Journal of Rotating Machinery 4, no. 4 (1998): 271–82. http://dx.doi.org/10.1155/s1023621x98000232.

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A numerical analysis is performed to study thermal transport phenomena in gas flow through a strongly heated tube whose axis is in parallel with the rotational axis. The velocity and temperature fields prevail when fluid flows in a rotating tube with uniform heat flux on the tube wall. The two-equationk-ωturbulence andt2¯-εtheat transfer models are employed to determine turbulent viscosity and eddy diffusivity for heat, respectively. The governing boundary-layer equations are discritized by means of a control volume finitedifference techniques. It is found that the Coriolis and centrifugal (or

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15

Zeng, Lunwu, Zhongliang Tang, Hua Li, Yanyan Zhao, Cunli Dai, and Runxia Song. "Experimental observation of heat wave cloak." Modern Physics Letters B 28, no. 12 (2014): 1450098. http://dx.doi.org/10.1142/s0217984914500985.

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According to the heat conduction theory and effective medium theory, we fabricated a six-layer cylinder heat diffusion cloak by mixing heat conduction materials. We measured the time-dependant heat wave at the iso-temperature lines and the heat flux lines with a self-made heat wave device. The experiment results show that the iso-temperature lines are parallel outside the outer circle, the heat fluxes are parallel and equal outside the outer circle, and the heat fluxes in the inner circle are much smaller than those outside the outer circle, namely, the heat fluxes are guided outside the cloak

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16

Niazmand, Hamid, and Behnam Rahimi. "MIXED CONVECTIVE SLIP FLOWS IN A VERTICAL PARALLEL PLATE MICROCHANNEL WITH SYMMETRIC AND ASYMMETRIC WALL HEAT FLUXES." Transactions of the Canadian Society for Mechanical Engineering 36, no. 3 (2012): 207–18. http://dx.doi.org/10.1139/tcsme-2012-0015.

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Mixed convective gaseous slip flows in an open-ended vertical parallel-plate channel with symmetric and asymmetric wall heat fluxes are numerically investigated. Buoyancy effects on developing and fully developed solutions are studied using the SIMPLE algorithm. The velocity and temperature fields are examined for different values of Knudsen number, mixed convection parameter and heat flux ratio. It is found that increasing Gr/Re leads to an increase in the heat transfer rate and friction coefficient. Also, rarefaction effects decrease the heat transfer rate and friction coefficient. The frict

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17

Weng, Xia, and Dong Yao Liu. "Experimental Study on Heat Transfer Characteristics of Water and Ethanol Flow Boiling in Micro-Channel." Applied Mechanics and Materials 330 (June 2013): 788–91. http://dx.doi.org/10.4028/www.scientific.net/amm.330.788.

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The Heat transfer characteristics of water and ethanol flow boiling in micro-channel are studied. Flow boiling of different mass and heat flux is carried out in 61 parallel microchannel with hydro diameter of 0.293mm, and the local heat transfer coefficient (HTC) of is calculated. The results indicate that the HTC decreases with the increasing of vapor quality, and depends on heat flux. Two latest correlations are used to predict the experiment, and the results indicate that the Bond number plays an important role in the correlation.

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18

Kostanovskiy, А. V., M. E. Kostanovskaya, M. G. Zeodinov, and A. A. Pronkin. "Heat conductivity of pyrolytic graphite of mark UPV-1 at temperatures 1900–2950 K." Izmeritel`naya Tekhnika, no. 9 (2020): 50–53. http://dx.doi.org/10.32446/0368-1025it.2020-9-50-53.

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The urgency of the work is caused by that at research of heat conductivity in anisotropic materials is necessary to consider infringement of parallelism between vectors of heat flux and a gradient of temperature. In the previous works at studying heat conductivity of pyrolytic graphites techniques which were applied to isotropic graphites were used. Results of measurement of heat conductivity of pyrolytic graphite of mark UPV-1 in a direction in parallel to a plane of sedimentation are presented. The experimental samples which are heated up by an electric current, represented hollow cylinders

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19

Han, J. C., Y. M. Zhang, and C. P. Lee. "Influence of Surface Heat Flux Ratio on Heat Transfer Augmentation in Square Channels With Parallel, Crossed, and V-Shaped Angled Ribs." Journal of Turbomachinery 114, no. 4 (1992): 872–80. http://dx.doi.org/10.1115/1.2928042.

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The effect of wall heat flux ratio on the local heat transfer augmentation in a square channel with two opposite in-line ribbed walls was investigated for Reynolds numbers from 15,000 to 80,000. The square channel composed of ten isolated copper sections has a length-to-hydraulic diameter ratio (L/D) of 20. The rib height-to-hydraulic diameter ratio (e/D) is 0.0625 and the rib pitch-to-height ratio (P/e) equals 10. Six ribbed side to smooth side wall heat flux ratios (Case 1—q″r1/q″s = q″r2/q″s = 1; Case 2—q″r1/q″s = q″r2/q″s = 3; Case 3—q″r1/q″s = q″r2/q″s = 6; Case 4—q″r1/q″s = 6 and q″r2/q″

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20

Taler, Jan, Dawid Taler, and Andrzej Kowal. "Measurements of absorbed heat flux and water-side heat transfer coefficient in water wall tubes." Archives of Thermodynamics 32, no. 1 (2011): 77–88. http://dx.doi.org/10.2478/v10173-011-0004-6.

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Measurements of absorbed heat flux and water-side heat transfer coefficient in water wall tubes The tubular type instrument (flux tube) was developed to identify boundary conditions in water wall tubes of steam boilers. The meter is constructed from a short length of eccentric tube containing four thermocouples on the fire side below the inner and outer surfaces of the tube. The fifth thermocouple is located at the rear of the tube on the casing side of the water-wall tube. The boundary conditions on the outer and inner surfaces of the water flux-tube are determined based on temperature measur

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21

Fujino, T., Y. Yokoyama, and Y. H. Mori. "Augmentation of Laminar Forced-Convective Heat Transfer by the Application of a Transverse Electric Field." Journal of Heat Transfer 111, no. 2 (1989): 345–51. http://dx.doi.org/10.1115/1.3250683.

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The effect of a uniform d-c electric field on laminar forced-convective heat transfer has been studied experimentally with a weakly conducting fluorocarbon refrigerant in the liquid state that is flowing in a channel confined by parallel-plate electrodes, one of which serves as a heat transfer surface of uniform heat flux. The dependencies of the heat transfer coefficient and the pressure drop on the sign and the magnitude of an applied voltage, the heat flux at the heat transfer surface, the electrical conductivity of the test fluid, etc. are presented, and the structure and the mechanism of

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22

Hattori, Masanari, Soichi Tanaka, and Shigeru Takata. "Heat transfer in a dense gas between two parallel plates." AIP Advances 12, no. 5 (2022): 055220. http://dx.doi.org/10.1063/5.0091390.

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Time-dependent heat transfer in a dense gas between two parallel plates, which is initiated by an abrupt change in temperature of one plate, is numerically investigated on the basis of the Enskog equation under the diffuse reflection boundary condition. Numerical computation is carried out by a finite-difference scheme combined with the Fourier spectral method for the efficient computation of the collision term of the Enskog equation. As a result, macroscopic quantities of the gas, such as heat flux and temperature, are obtained for various Knudsen numbers and ratios of the molecular diameter

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23

Jiang, Zhengyong, Mengjie Song, Jun Shen, Long Zhang, Xuan Zhang, and Shenglun Lin. "Experimental Investigation on the Flow Boiling of Two Microchannel Heat Sinks Connected in Parallel and Series for Cooling of Multiple Heat Sources." Micromachines 14, no. 8 (2023): 1580. http://dx.doi.org/10.3390/mi14081580.

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Cooling methods for multiple heat sources with high heat flux have rarely been reported, but such situations threaten the stable operation of electronic devices. Therefore, in this paper, the use of two microchannel heat sinks is proposed, with and without grooves, labeled Type A and Type B, respectively. Experimental investigations on the flow boiling of two microchannel heat sinks connected in parallel and in series are carried out under different mass fluxes. In addition, a high-speed camera is used to observe flow patterns in the microchannels. The cold plate wall temperature (Tw), heat tr

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Kumar Parwani, Ajit, Prabal Talukdar, and P. M. V. Subbarao. "Estimation of transient boundary flux for a developing flow in a parallel plate channel." International Journal of Numerical Methods for Heat & Fluid Flow 24, no. 3 (2014): 522–44. http://dx.doi.org/10.1108/hff-01-2012-0020.

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Purpose – The purpose of this paper is to develop a numerical model for estimating the unknown boundary heat flux in a parallel plate channel for the case of a hydrodynamically and thermally developing laminar flow. Design/methodology/approach – The conjugate gradient method (CGM) is used to solve the inverse problem. The momentum equations are solved using an in-house computational fluid dynamics (CFD) source code. The energy equations along with the adjoint and sensitivity equations are solved using the finite volume method. Findings – The effects of number of measurements, distribution of m

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Fu, Ben-Ran, Shan-Yu Chung, Wei-Jen Lin, Lei Wang, and Chin Pan. "Critical heat flux enhancement of HFE-7100 flow boiling in a minichannel heat sink with saw-tooth structures." Advances in Mechanical Engineering 9, no. 2 (2017): 168781401668902. http://dx.doi.org/10.1177/1687814016689022.

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A heat sink with convective boiling in micro- or mini-channels is with great potential to meet the requirement of the high heat dissipation of the electronic devices. This study investigates the flow boiling of HFE-7100, having a suitable boiling temperature at atmospheric pressure and dielectric property, in the minichannel heat sink with the modified surface (namely, the saw-tooth structure). The effect of the system pressure on the boiling characteristics was also studied. The results reveal that the critical heat flux can be significantly improved by introducing the saw-tooth structures on

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Krishnan, A. S., C. Balaji, and S. P. Venkateshan. "An Experimental Correlation for Combined Convection and Radiation Between Parallel Vertical Plates." Journal of Heat Transfer 126, no. 5 (2004): 849–51. http://dx.doi.org/10.1115/1.1795245.

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Results of an experimental study of natural convection and surface radiation between three parallel vertical plates, symmetrically spaced, with air as the intervening medium are presented. The analysis consists of heating the central plate at different levels and recording the temperatures of both the central and the side plates at steady state conditions. Based on the measurements, a correlation for the maximum temperature excess of the “hot” plate in terms of the emissivity of the central and the side plates, the aspect ratio, and the dimensionless total heat flux is given, valid for a range

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Siddiqui, Perwez. "Density Modelling in Mixed Convection Flow in a Vertical Parallel Plate Channel." International Journal of Heat and Technology 39, no. 4 (2021): 1294–304. http://dx.doi.org/10.18280/ijht.390428.

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In this paper, a novel way of modelling the density in buoyancy term of mixed convection flow problem is presented using equation of state and Boussinesq approximation without first-order approximation of density with respect to temperature. The presented density model is used to investigate the laminar mixed convection flow in a vertical parallel plate channel under symmetric constant wall heat flux. The results obtained are compared with the results obtained using first-order approximation of density with Boussinesq approximation, and also compared with the results obtained using variable th

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Budaev, Bair V., and David B. Bogy. "The role of EM wave polarization on radiative heat transfer across a nanoscale gap." Journal of Applied Physics 132, no. 5 (2022): 054903. http://dx.doi.org/10.1063/5.0094382.

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This work presents a novel study of radiative heat transfer between closely separated plates based on an extension of Planck’s spectrum of thermal radiations to systems with a steady heat flux. This extension together with electromagnetic wave theory is chosen specifically to avoid the commonly used so-called fluctuation dissipation theory, which is also limited to equilibrium systems. The spectrum of thermal radiation with a heat flux is described by the introduction of an analog of a chemical potential, which creates a bias toward the direction of heat transfer. This is the first comprehensi

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Hao, Yun, Kaituo Chen, Yueshe Wang, and Tian Hu. "Effect of One-Target Focus Type on Hydrodynamic Characteristics of Tower Solar Cavity Receiver." Advances in Mechanical Engineering 6 (January 1, 2014): 615942. http://dx.doi.org/10.1155/2014/615942.

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On account of one-target focus type of the heliostats in the tower solar power technology, the heat transfer was analyzed for the vapor-liquid two-phase or single-phase superheated steam in the parallel heated panel bundles of the solar cavity receiver. A nonlinear mathematical model of the hydrodynamic characteristics in the evaporation panels was developed to obtain the flow rate distribution, thermal deviation, and two-phase flow circulation reliability of the working fluid under the severe nonuniform heat flux from the one-target focus of the heliostats. The simulation results show that fo

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R, Nyabuto, Sigey J.K, Okelo J.A, and Okwoyo J.M. "Magneto-Hydrodynamics Analysis of Free Convection Flow between Two Horizontal Parallel Infinite Plates Subjected to Constant Heat Flux." SIJ Transactions on Computer Networks & Communication Engineering 01, no. 04 (2013): 08–12. http://dx.doi.org/10.9756/sijcnce/v1i4/0104520101.

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Spearpoint, Michael, Charlie Hopkin, and Danny Hopkin. "Modelling the thermal radiation from kitchen hob fires." Journal of Fire Sciences 38, no. 4 (2020): 377–94. http://dx.doi.org/10.1177/0734904120923566.

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Kitchen hob fires present a potential threat to occupants escaping from dwellings and calculations may be needed to assess the hazard. Determination of the thermal heat flux from flames to a target can be achieved through the use of hand calculation methods or computational tools. This article compares point source, parallel plane and cylindrical view factor hand calculations and computational simulations using B-RISK and Fire Dynamics Simulator of thermal heat flux with kitchen hob fire experiments presented in the literature. Knowing the level of accuracy of each method provides useful infor

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Fallahzadeh, Rasoul, Fabio Bozzoli, Luca Cattani, and Muhammad Waheed Azam. "Effect of Cross Nanowall Surface on the Onset Time of Explosive Boiling: A Molecular Dynamics Study." Energies 17, no. 5 (2024): 1107. http://dx.doi.org/10.3390/en17051107.

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Explosive boiling is a fast-phase transition from an ultra-thin liquid film to vapor under an extremely high heat flux, which typically has been studied using the molecular dynamics simulation (MDS) method. The present MDS study investigated the explosive boiling of a liquid argon nanofilm over different solid copper surfaces with different nanowall patterns, including parallel and cross nanowalls. For each surface, atomic motion trajectories, the number of liquid and vapor argon atoms, heat flux, and, mainly, the onset time of explosive boiling were investigated. The simulation results indica

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Yang, Zhuqiang, Ruipu Miao, Zhen Jin, Feng Liu, Qiao Kang, and Bo Zhang. "HYDROCARBON FUEL IN HORIZONTAL PARALLEL CHANNELS WITH NONUNIFORM HEAT FLUX BOUNDARY." Heat Transfer Research 53, no. 8 (2022): 55–74. http://dx.doi.org/10.1615/heattransres.2022041445.

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Ng, Jonathan, Ammar Hakim, A. Bhattacharjee, Adam Stanier, and W. Daughton. "Simulations of anti-parallel reconnection using a nonlocal heat flux closure." Physics of Plasmas 24, no. 8 (2017): 082112. http://dx.doi.org/10.1063/1.4993195.

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Guedes, R. O. C., M. N. Ozisik, and R. M. Cotta. "Conjugated Periodic Turbulent Forced Convection in a Parallel Plate Channel." Journal of Heat Transfer 116, no. 1 (1994): 40–46. http://dx.doi.org/10.1115/1.2910881.

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The transient conjugated turbulent heat transfer with axial conduction in the wall and convection boundary conditions is solved with the generalized integral transform technique for the flow of a Newtonian fluid in a parallel-plate duct subjected to periodically varying inlet temperature. A lumped model that neglects transverse temperature gradients in the solid, but takes into account the axial heat conduction along the wall, is adopted. Accurate numerical results are presented for the fluid bulk temperature, wall temperature, and wall heat flux. The effects of the conjugation parameter, flui

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Maughan, J. R., and F. P. Incropera. "Mixed Convection Heat Transfer With Longitudinal Fins in a Horizontal Parallel Plate Channel: Part I—Numerical Results." Journal of Heat Transfer 112, no. 3 (1990): 612–18. http://dx.doi.org/10.1115/1.2910431.

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Numerical calculations for laminar, fully developed mixed convection in a longitudinally finned horizontal channel have been performed for two sets of boundary conditions: (i) an isothermal, heated bottom plate with an isothermal, cooled top plate, and (ii) a uniform heat flux at the bottom surface with an adiabatic upper surface. Heat transfer and the strength of the buoyancy-driven secondary flow increase with increasing Rayleigh number and fin height. Fin spacing affects heat transfer through changes in the axial velocity distribution, the strength of the secondary flow, and the heated surf

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Hidalgo-Salaverri, J., J. Gonzalez-Martin, J. Ayllon-Guerola, et al. "Thermo-mechanical limits of a magnetically driven fast-ion loss detector in the ASDEX Upgrade tokamak." Journal of Instrumentation 17, no. 02 (2022): C02020. http://dx.doi.org/10.1088/1748-0221/17/02/c02020.

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Abstract A real-time control system is being developed for a magnetically driven Fast-Ion Loss Detector (FILD) at the ASDEX Upgrade tokamak. The insertion of the diagnostic head will be adjusted in real-time to react to changes in the graphite head temperature, plasma position and appearance of MHD instabilities. The graphite probe head of the detector is exposed to an intense heat flux (located ∼3–5 cm from separatrix). The control algorithm performance is constrained by: the graphite head sublimation temperature, the ultimate stress limit, the reaction time of the controller and the retracti

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Duhau, S., and A. De La Torre. "Hydromagnetic waves for a collisionless plasma in strong magnetic fields." Journal of Plasma Physics 34, no. 1 (1985): 67–76. http://dx.doi.org/10.1017/s0022377800002683.

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A hydrodynamic system of equations, valid in the limit in which the Larmor radius and the electron to ion mass ratio are both zero, and including the thermo-dynamic variables and the energy equation of the electrons, is used to investigate the propagation of small-amplitude waves in a collisionless heat-conducting plasma. The result is compared with that derived from the Chew, Goldberger & Low equations. It is found that for zero heat flux, the inclusion of the electron pressure does not change the number and characteristic of the modes but modifies the mirror stability criterion. In the g

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Gao, Huaibin, Xiaojiang Liu, Chuanwei Zhang, Yu Ma, Hongjun Li, and Guanghong Huang. "Design and Experimental Investigation of a Self-Powered Fan Based on a Thermoelectric System." Energies 16, no. 2 (2023): 975. http://dx.doi.org/10.3390/en16020975.

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Providing electricity for isolated areas or emergencies (snowstorms, earthquakes, hurricanes, etc.) is an important challenge. In this study, a prototype of a self-powered fan based on a thermoelectric system was built to enhance the heat dissipation of the thermoelectric generator (TEG) systems using household stoves as heat sources. To improve output performance of the system, a heat collector consisting of a heat-conducting flat plate and a heat sink with fan cooling was designed to integrate several thermoelectric modules (TEM). The effects of the fan operating conditions (airflow velocity

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Kaniowski, Robert. "Pool Boiling of Novec-649 on Inclined Microchannel." Energies 16, no. 5 (2023): 2476. http://dx.doi.org/10.3390/en16052476.

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Significant amounts of heat flow can be removed with small temperature differences by boiling. This process is used in a variety of industries, e.g., cooling electronics, digital circuits, power sources, etc. Heat dissipation from equipment that generates significant heat flows involves the movement of thermal energy through a wall into a cooling fluid. In the present study, this mechanism was analysed during the boiling of Novec-649 fluid at atmospheric pressure. The heat transfer surfaces were samples made of copper with milled, parallel grooves with a depth of 0.3 mm and a width ranging fro

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Singh, Munendra Pal, Abdallah Sofiane Berrouk, and Suneet Singh. "A Comparative Assessment on Different Aspects of the Non-Linear Instability Dynamics of Supercritical Fluid in Parallel Channel Systems." Energies 15, no. 10 (2022): 3652. http://dx.doi.org/10.3390/en15103652.

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The thermal-hydraulic behavior of supercritical water reactors with a parallel channel configuration was examined through a non-linear instability analysis. This analysis was performed under wide-ranging conditions and aspects, including different working supercritical fluids, varied heat-flux and flow-rate conditions, and channel inclinations. The supercritical fluid (SCFs) dynamics were captured using the density, enthalpy, and velocity analytical approximation functions. The major findings show that both SCFs (water and carbon dioxide) experienced density wave oscillations at a low pseudo-s

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Kaniowski, Robert, and Robert Pastuszko. "Pool Boiling of Water on Surfaces with Open Microchannels." Energies 14, no. 11 (2021): 3062. http://dx.doi.org/10.3390/en14113062.

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Boiling, as the most efficient type of convective heat transfer, is an area of interest in many fields of industry and science. Many works have focused on improving the heat transfer efficiency of boiling by altering the physical and chemical properties of surfaces by using different technological processes in their fabrication. This paper presents experimental investigations into pool boiling on enhanced surfaces with open microchannels. The material of the fabricated surface was copper. Parallel microchannels made by machining were about 0.2, 0.3, and 0.4 mm wide, 0.2 to 0.5 mm deep, and spa

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Pastuszko, Robert. "Pool Boiling Heat Transfer of Ethanol on Surfaces with Minichannels." Energies 18, no. 15 (2025): 3938. https://doi.org/10.3390/en18153938.

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In this paper, the pool boiling of ethanol was analyzed. The experiments were carried out at atmospheric pressure. Heat transfer surfaces in the form of deep minichannels were made of copper. The channels with a depth of 0.2 to 0.5 mm were milled in parallel. The width of the minichannels was 0.6–1.2 mm, and the depth was 5.5, 6, and 10 mm. The highest heat transfer coefficient, 52 kW/m2K, was achieved for the minichannels with a depth of 6 mm and a width of 0.8 mm. The maximum heat flux of 953 kW/m2 was produced using minichannels 5.5 mm deep and 0.5 mm wide. An over threefold increase in the

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Meng, Jianping, Yonghao Zhang, and Jason M. Reese. "Numerical Simulation of Rarefied Gas Flows with Specified Heat Flux Boundary Conditions." Communications in Computational Physics 17, no. 5 (2015): 1185–200. http://dx.doi.org/10.4208/cicp.2014.m343.

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AbstractWe investigate unidirectional rarefied flows confined between two infinite parallel plates with specified heat flux boundary conditions. Both Couette and force-driven Poiseuille flows are considered. The flow behaviors are analyzed numerically by solving the Shakhov model of the Boltzmann equation. We find that a zero-heat-flux wall can significantly influence the flow behavior, including the velocity slip and temperature jump at the wall, especially for high-speed flows. The predicted bimodal-like temperature profile for force-driven flows cannot even be qualitatively captured by the

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Franc¸a, Francis H. R., Ofodike A. Ezekoye, and John R. Howell. "Inverse Boundary Design Combining Radiation and Convection Heat Transfer." Journal of Heat Transfer 123, no. 5 (2001): 884–91. http://dx.doi.org/10.1115/1.1388298.

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This work investigates inverse boundary design for radiation, convection and conduction combined-mode heat transfer. The problem consists of finding the heat flux distribution on a heater that satisfies both the temperature and the heat flux prescribed on a design surface of an enclosure formed by two finite parallel plates. A gray participating medium flows in laminar regime between the walls, which are gray, diffuse emitters and absorbers. All the thermal properties are uniform. This problem is described by an ill-conditioned system of non-linear equations. The solution is obtained by regula

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Guo, Zehua, and Xian-Zhu Tang. "Parallel transport of long mean-free-path plasma along open magnetic field lines: Parallel heat flux." Physics of Plasmas 19, no. 6 (2012): 062501. http://dx.doi.org/10.1063/1.4725494.

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Atmaca, Ş. Ulaş, İlker Göktepeli, and Ali Ateş. "The Effects of Nanofluids on Forced Convection Heat Transfer Inside Parallel Plate Heated with Flush Mounted Discrete Heater Sources." International Journal of Civil, Mechanical and Energy Science 9, no. 1 (2023): 01–09. http://dx.doi.org/10.22161/ijcmes.9.1.1.

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A numerical solution on forced convection of Al2O3-water nanofluid for different volume fractions is investigated for laminar flow through a parallel plate with flush mounted discrete heat sources. The model used for nanofluid mixture is a single-phase approach and fluid properties are considered constant with temperature. The finite difference method is used for solutions and four different volume fractions are considered varying from 0% to 4%. A fully developed laminar velocity profile is considered and the parallel plate is assumed as heated with three discrete heat sources flush mounted to

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Irani, Mazda, and Ian Gates. "Understanding the Convection Heat-Transfer Mechanism in the Steam-Assisted-Gravity-Drainage Process." SPE Journal 18, no. 06 (2013): 1202–16. http://dx.doi.org/10.2118/167258-pa.

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Summary Steam-assisted gravity drainage (SAGD) is the preferred method to extract bitumen from Athabasca oil-sand reservoirs in western Canada. In SAGD, steam, injected outward from a horizontal injection well, loses its latent heat when it contacts the cold bitumen at the edge of a steam chamber. Consequently, the viscosity of the bitumen falls several orders of magnitude, enabling it to flow under gravity toward a horizontal production well directly below to the injection well. It is commonly believed that conduction is the dominant heat-transfer mechanism at the edge of the chamber. Heat tr

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Kaniowski, Robert, and Robert Pastuszko. "Boiling of FC-72 on Surfaces with Open Copper Microchannel." Energies 14, no. 21 (2021): 7283. http://dx.doi.org/10.3390/en14217283.

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The paper presents the results of experimental research on pool boiling heat transfer of dielectric liquid FC-72. Measurements were made at atmospheric pressure on open surfaces with microchannels. Heat transfer surfaces, in the form of parallel milled microchannels, were made of copper. The rectangular cross-sectional microchannels were 0.2 to 0.5 mm deep and 0.2 to 0.4 mm wide. The surfaces, compared to a smooth flat surface, provided a five-fold increase in the heat transfer coefficient and a two-fold increase in the critical heat flux. The article analyses the influence of the width and he

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Gupta, U., and C. R. Sovinec. "Pressure-driven tearing and thermal transport in finite-beta reversed field pinch computations." Physics of Plasmas 30, no. 1 (2023): 013901. http://dx.doi.org/10.1063/5.0124281.

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Nonlinear resistive-magnetohydrodynamics (MHD) computation with heating and anisotropic transport is applied to examine the interaction between thermal energy and magnetic fluctuations in inductively driven reversed-field pinches (RFPs). The magnetic fluctuations underlie magnetic field reversal through dynamo-like correlations, and they enhance thermal energy transport through fluctuations of parallel heat flux density. With the unfavorable magnetic curvature that exists across the RFP profile, thermal energy also affects the magnetic fluctuations. Computations with the NIMROD code [Sovinec e

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