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Journal articles on the topic 'Boiling on porous surfaces'

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Published: 30 May 2022

Last updated: 31 May 2022

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1

Li, Chen, and G. P. Peterson. "Parametric Study of Pool Boiling on Horizontal Highly Conductive Microporous Coated Surfaces." Journal of Heat Transfer 129, no. 11 (April 10, 2007): 1465–75. http://dx.doi.org/10.1115/1.2759969.

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To better understand the mechanisms that govern the behavior of pool boiling on horizontal highly conductive microporous coated surfaces, a series of experimental investigations were designed to systematically examine the effects of the geometric dimensions (i.e., coating thickness, volumetric porosity, and pore size, as well as the surface conditions of the porous coatings) on the pool-boiling performance and characteristics. The study was conducted using saturated distilled water at atmospheric pressure (101kPa) and porous surfaces fabricated from sintered isotropic copper wire screens. For nucleate boiling on the microporous coated surfaces, two vapor ventilation modes were observed to exist: (i) upward and (ii) mainly from sideways leakage to the unsealed sides and partially from the center of porous surfaces. The ratio of the heater size to the coating thickness, the friction factor of the two-phase flow to single-phase flow inside the porous coatings, as well as the input heat flux all govern the vapor ventilation mode that occurs. In this investigation, the ratio of heater size to coating thickness varies from 3.5 to 38 in order to identify the effect of heater size on the boiling characteristics. The experimental results indicate that the boiling performance and characteristics are also strongly dependent on the volumetric porosity and mesh size, as well as the surface conditions when the heater size is given. Descriptions and discussion of the typical boiling characteristics; the progressive boiling process, from pool nucleate boiling to film boiling; and the boiling performance curves on conductive microporous coated surfaces are all systematically presented.

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2

Parker, Jack L., and Mohamed S. El-Genk. "Effect of Surface Orientation on Nucleate Boiling of FC-72 on Porous Graphite." Journal of Heat Transfer 128, no. 11 (March 13, 2006): 1159–75. http://dx.doi.org/10.1115/1.2352783.

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Effects of orientations of porous graphite and smooth copper surfaces, measuring 10mm×10mm, on saturation nucleate boiling and critical heat flux (CHF) of FC-72 dielectric liquid and of liquid subcooling (0, 10, 20, and 30K) on nucleate boiling in the upward facing orientation are investigated. Inclination angles (θ) considered are 0deg (upward-facing), 60, 90, 120, 150, and 180deg (downward facing). The values of nucleate boiling heat flux, nucleate boiling heat transfer coefficient (NBHTC), and CHF are compared with those measured on the smooth copper surface of the same dimensions and CHF values on both copper and porous graphite are compared with those reported by other investigators on the smooth surfaces and microporous coatings. Results demonstrated higher NBHTC and CHF on porous graphite, particularly in the downward-facing orientation (θ=180deg). In the upward-facing orientation, NBHTCs on both surfaces decrease with increased subcooling, but increase with increased surface superheat reaching maxima then decrease with further increase in surface superheat. In saturation boiling on copper and both saturation and subcooled boiling on porous graphite these maxima occur at or near the end of the discrete bubble region, and near CHF in subcooled boiling on copper. Maximum saturation NBHTC on porous graphite increases with decreased surface superheat and inclination angle, while that on copper increases with increased surface superheat and decreased surface inclination. At low surface superheats, saturation nucleate boiling heat flux increases with increased inclination, but decreases with increased inclination at high surface superheats, consistent with previously reported data for dielectric and nondielectric liquids. The fractional decreases in saturation CHF with increased θ on smooth copper and microporous coatings are almost identical, but markedly larger than on porous graphite, particularly in the downward-facing orientation. In this orientation, saturation CHF on porous graphite of 16W∕cm2 is much higher than on copper (4.9W∕cm2) and as much as 53% of that in the upward-facing orientation, compared to only ∼18% on copper.

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3

Polyaev, V. M., and B. V. Kichatov. "Boiling of solutions on porous surfaces." Theoretical Foundations of Chemical Engineering 34, no. 1 (January 2000): 22–26. http://dx.doi.org/10.1007/bf02757460.

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4

Sajjad, Uzair, Imtiyaz Hussain, Muhammad Sultan, Sadaf Mehdi, Chi-Chuan Wang, Kashif Rasool, Sayed M. Saleh, Ashraf Y. Elnaggar, and Enas E. Hussein. "Determining the Factors Affecting the Boiling Heat Transfer Coefficient of Sintered Coated Porous Surfaces." Sustainability 13, no. 22 (November 16, 2021): 12631. http://dx.doi.org/10.3390/su132212631.

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The boiling heat transfer performance of porous surfaces greatly depends on the morphological parameters, liquid thermophysical properties, and pool boiling conditions. Hence, to develop a predictive model valid for diverse working fluids, it is necessary to incorporate the effects of the most influential parameters into the architecture of the model. In this regard, two Bayesian optimization algorithms including Gaussian process regression (GPR) and gradient boosting regression trees (GBRT) are used for tuning the hyper-parameters (number of input and dense nodes, number of dense layers, activation function, batch size, Adam decay, and learning rate) of the deep neural network. The optimized model is then employed to perform sensitivity analysis for finding the most influential parameters in the boiling heat transfer assessment of sintered coated porous surfaces on copper substrate subjected to a variety of high- and low-wetting working fluids, including water, dielectric fluids, and refrigerants, under saturated pool boiling conditions and different surface inclination angles of the heater surface. The model with all the surface morphological features, liquid thermophysical properties, and pool boiling testing parameters demonstrates the highest correlation coefficient, R2 = 0.985, for HTC prediction. The superheated wall is noted to have the maximum effect on the predictive accuracy of the boiling heat transfer coefficient. For example, if the wall superheat is dropped from the modeling parameters, the lowest prediction of R2 (0.893) is achieved. The surface morphological features show relatively less influence compared to the liquid thermophysical properties. The proposed methodology is effective in determining the highly influencing surface and liquid parameters for the boiling heat transfer assessment of porous surfaces.

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5

Webb, Ralph L. "Donald Q. Kern Lecture Award Paper: Odyssey of the Enhanced Boiling Surface." Journal of Heat Transfer 126, no. 6 (December 1, 2004): 1051–59. http://dx.doi.org/10.1115/1.1834615.

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This paper traces the evolution of enhanced boiling surfaces. Early work was highly empirical and done in industrial research. The 1968 Milton patent [“Heat Exchange System,” U.S. Patent 3,696,861] described the first porous coated surface, and the 1972 Webb patent [“Heat Transfer Surface Having a High Boiling Heat Transfer Coefficient,” U.S. Patent 3,521,708] described a “structured” tube surface geometry. The first fundamental understanding of the “pore-and-tunnel” geometry was published by Nakayama in 1980 [Nakayama, W., Daikoku, T., Kuwahara, H., and Nakajima, T. 1980, “Dynamic Model of Enhanced Boiling Heat Transfer on Porous Surfaces Part I: Experimental Investigation,” J. Heat Transfer, 102, pp. 445–450]. Webb and Chien’s flow visualization allowed observation of the evaporation in the subsurface tunnels [Chien, L.-H., and Webb, R. L., 1998, “Visualization of Pool Boiling on Enhanced Surfaces,” Exp. Fluid Thermal Sci., 16b, pp. 332–341]. They also performed an experimental parametric study that defines the effect of pore diameter and pitch on the boiling performance. The progression of work on analytical boiling models is also reviewed.

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6

Chang, J. Y., and S. M. You. "Heater Orientation Effects on Pool Boiling of Micro-Porous-Enhanced Surfaces in Saturated FC-72." Journal of Heat Transfer 118, no. 4 (November 1, 1996): 937–43. http://dx.doi.org/10.1115/1.2822592.

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Experiments are performed to understand the effects of surface orientation on the pool boiling characteristics of a highly wetting fluid from a flush-mounted, micro-porous-enhanced square heater. Micro-porous enhancement was achieved by applying copper and aluminum particle coatings to the heater surfaces. Effects of heater orientation on CHF and nucleate boiling heat transfer for uncoated and coated surfaces are compared. A correlation is developed to predict the heater orientation effect on CHF for those surfaces.

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7

Chang, J. Y., and S. M. You. "Enhanced Boiling Heat Transfer From Micro-Porous Cylindrical Surfaces in Saturated FC-87 and R-123." Journal of Heat Transfer 119, no. 2 (May 1, 1997): 319–25. http://dx.doi.org/10.1115/1.2824226.

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The present research is an experimental study of pool boiling heat transfer from cylindrical heater surfaces immersed in saturated FC-87 and R-123. The baseline heater surfaces tested are plain, integral-fin with 709 fins/m, and commercial enhanced (High-Flux and Turbo-B). In addition, a highly effective micro-scale enhancement coating is applied to the plain and integral-fin surfaces to augment nucleate boiling heat transfer. Experiments are performed to understand the effects of surface micro- and macro-geometries on boiling heat transfer. The boiling performance of the micro-porous enhanced plain and integral-fin surfaces are compared with the High-Flux and the Turbo-B surfaces. At high heat flux conditions, the break down of the bulk liquid feed mechanism reduces boiling enhancement from the cylindrical surfaces.

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8

Wang, Xue Sheng, Zheng Bian Wang, and Qin Zhu Chen. "Research on Manufacturing Technology and Heat Transfer Characteristics of Sintered Porous Surface Tubes." Advanced Materials Research 97-101 (March 2010): 1161–65. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.1161.

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A new process for manufacturing sintered porous surface tube has been developed. By using this technology, three kinds of sintered porous surface tubes were fabricated, which base material was carbon steel and the sintered layer was bronze powder. And their boiling heat transfer characteristics were investigated experimentally. The experimental results indicated that the boiling heat transfers coefficient and the heat flux of these porous surfaces tubes were increased by 8~14 times and 5~8 times respectively compared with the smooth one. Finally, a new high flux heat exchanger was designed and applied instead of conventional one in a refinery.

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9

WITHY, B., M. HYLAND, and B. JAMES. "PRETREATMENT EFFECTS ON THE SURFACE CHEMISTRY AND MORPHOLOGY OF ALUMINIUM." International Journal of Modern Physics B 20, no. 25n27 (October 30, 2006): 3611–16. http://dx.doi.org/10.1142/s0217979206040076.

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Chemical pretreatments are often used to improve the adhesion of coatings to aluminium. XPS and AFM were used to study the effect of these pretreatments on the surface chemistry and morphology of Al 5005. Four pretreatments were investigated, an acetone degrease, boiling water immersion, and two sulphuric acid etches, FPL and P2. Degreasing had no affect on surface morphology and simply added to the adventitious carbon on the surface. Boiling water immersion produced a chemically stable pseudo-boehmitic surface that was quite porous. The acid etches produced porous pitted surfaces similar to each other but significantly different to the other surfaces. The surface chemistry of the acid etched surfaces was variable and dependant on atmospheric conditions on removal from etch due to the very active surface that the etch produced.

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10

Polyaev, V. M., and B. V. Kichatov. "Boiling of Liquid on Surfaces with Porous Coatings;." Heat Transfer Research 35, no. 5-6 (2004): 406–20. http://dx.doi.org/10.1615/heattransres.v35.i56.90.

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11

Smirnov, Henry F. "Boiling on Coated Surfaces and in Porous Structures." Journal of Porous Media 4, no. 1 (2001): 20. http://dx.doi.org/10.1615/jpormedia.v4.i1.40.

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12

El-Genk, Mohamed S., and Amir F. Ali. "Enhanced nucleate boiling on copper micro-porous surfaces." International Journal of Multiphase Flow 36, no. 10 (October 2010): 780–92. http://dx.doi.org/10.1016/j.ijmultiphaseflow.2010.06.003.

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13

Afgan, Naim H., Larisa A. Jovic, Sergey A. Kovalev, and Victor A. Lenykov. "Boiling heat transfer from surfaces with porous layers." International Journal of Heat and Mass Transfer 28, no. 2 (February 1985): 415–22. http://dx.doi.org/10.1016/0017-9310(85)90074-2.

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14

Zhao, Zenghui, Yoav Peles, and Michael K. Jensen. "Water jet impingement boiling from structured-porous surfaces." International Journal of Heat and Mass Transfer 63 (August 2013): 445–53. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2013.03.085.

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15

Genbach, A. A., D. Yu Bondartsev, and A. Y. Shelginsky. "Summary of heat transfer processes and their comparative evaluation for capillary porous coatings in power plants." Safety and Reliability of Power Industry 12, no. 1 (April 10, 2019): 29–35. http://dx.doi.org/10.24223/1999-5555-2019-12-1-29-35.

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The crisis of heat exchange at boiling of water in porous structures used for cooling of heat-stressed surfaces of various aggregates is investigated. The study refers to thermal power installations of power plants. The experiments were carried out on a stand with heat supply from an electric heater. Cooling of heat-exchange surfaces was performed by water supply to porous structures with diff erent cell sizes. It is shown that in porous cooling systems of elements of heat and power plants processes of fl uid boiling take place, and at high heat fl ows it is possible to approach a crisis situation with overheating of the heat-exchange surface. The heat exchange processes are described, the infl uence of thermophysical properties of heat exchange surface is shown, and optimal sizes of porous structure cells are determined. A calculated equation is obtained for determining the critical heat fl ux at high pressures. The calculation of the critical load with respect to the examined porous structures was carried out with taking into account the underheating and fl ow rate, from which it follows that the underheating of the liquid enables to expand slightly the heat transfer capabilities in a porous cooling system. The experimental data of the investigated capillary porous cooling system operating under the joint action of capillary and mass forces are generalized, and its characteristics q=f(ΔT) are compared with boiling in large volume, heat pipes and thin-fi lm evaporators. The limits of diff erent capillary-porous coatings are given. High heat transfer boosting is provided by combined action of capillary and mass forces and has advantages in comparison with boiling in large volume, thin-fi lm evaporators and heat pipes. It is shown that the results of theoretical calculations conform well with experimental data.

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16

Galicia, Edgar Santiago, Yusuke Otomo, Toshihiko Saiwai, Kenji Takita, Kenji Orito, and Koji Enoki. "Subcooled Flow Boiling Heat Flux Enhancement Using High Porosity Sintered Fiber." Applied Sciences 11, no. 13 (June 24, 2021): 5883. http://dx.doi.org/10.3390/app11135883.

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Passive methods to increase the heat flux on the subcooled flow boiling are extremely needed on modern cooling systems. Many methods, including treated surfaces and extended surfaces, have been investigated. Experimental research to enhance the subcooled flow boiling using high sintered fiber attached to the surface was conducted. One bare surface (0 mm) and four porous thickness (0.2, 0.5, 1.0, 2.0 mm) were compared under three different mass fluxes (200, 400, and 600 kg·m−2·s−1) and three different inlet subcooling temperature (70, 50, 30). Deionized water under atmospheric pressure was used as the working fluid. The results confirmed that the porous body can enhance the heat flux and reduce the wall superheat temperature. However, higher porous thickness presented a reduction in the heat flux in comparison with the bare surface. Bubble formation and pattern flow were recorded using a high-speed camera. The bubble size and formation are generally smaller at higher inlet subcooling temperatures. The enhancement in the heat flux and the reduction on the wall superheat is attributed to the increment on the nucleation sites, the increment on the heating surface area, water supply ability through the porous body, and the vapor trap ability.

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17

Li, Yong, Ke Long Zhang, Hai Kun Tao, and Wei Jian Lv. "Experimental Study on Pool Boiling Heat Transfer Characteristics of Porous Surface Tube." Applied Mechanics and Materials 192 (July 2012): 24–28. http://dx.doi.org/10.4028/www.scientific.net/amm.192.24.

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The pooling boiling plays an important role in the operation of the passive residual heat removal heat exchanger (PRHR HX). At present, smooth tubes are still widely used as boiling element in the PRHR HX; there is great extension to improve the security and miniaturize the size of PRHR HX if the smooth tubes were replaced by porous surface tubes. In this paper, the pool boiling heat transfer characteristics of porous surface tube was researched experimentally. The result shows that the porous surface tube can enhance the pooling boiling significantly: Compared with the smooth tube, the porous surface tube can greatly reduced the time before the water reached saturation; the wall superheat decreases about 1.5°C and the boiling heat transfer coefficient increases 68% to 75%. Besides, the enhanced mechanism of the porous surface tubes is also discussed in this paper.

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18

Rao, S. Madhusudana, and A. R. Balakrishnan. "Analysis of pool boiling heat transfer over porous surfaces." Heat and Mass Transfer 32, no. 6 (August 19, 1997): 463–69. http://dx.doi.org/10.1007/s002310050146.

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19

Lin, Zhiping, Tongze Ma, and Zhengfang Zhang. "Investigation of enhanced boiling heat transfer from porous surfaces." Journal of Thermal Science 3, no. 4 (December 1994): 250–56. http://dx.doi.org/10.1007/bf02653135.

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20

Polyaev, V. M., and B. V. Kichatov. "Boiling of a liquid on surfaces with porous coatings." Journal of Engineering Physics and Thermophysics 73, no. 2 (March 2000): 253–58. http://dx.doi.org/10.1007/bf02681726.

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21

Stubos, A. K., and J. M. Buchlin. "Enhanced Cooling via Boiling in Porous Layers: The Effect of Vapor Channels." Journal of Heat Transfer 121, no. 1 (February 1, 1999): 205–10. http://dx.doi.org/10.1115/1.2825946.

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Enhanced heat transfer via boiling in a porous layer covering the heated surface is considered analytically. The effect of vapor channels traversing the porous layer on the power for which a vapor film on the heated surface occurs, is examined by comparing the heat removal capability of the system with and without channels. A significant increase of the attained coolability level is obtained theoretically leading to the possibility of new design configurations for the cooling of intensely heated surfaces.

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22

Ovsyannik, A. V., and E. N. Makeeva. "DETERMINING OF PARAMETERS OF HEAT EXCHANGE FOR VAPORIZATION OF THE MIXED REFRIGERANT ON THE HIGH THERMAL CONDUCTIVITY SINTERED POWDER CAPILLARY-POROUS COATINGS." ENERGETIKA. Proceedings of CIS higher education institutions and power engineering associations 61, no. 1 (January 23, 2018): 70–79. http://dx.doi.org/10.21122/1029-7448-2018-61-1-70-79.

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The results of experimental research of heat exchange under the nucleate boiling of refrigerants R404a, R407c and R410a on the tubes with capillary-porous coating are presented. Experimental studies were carried out with the aid of an experimental installation in conditions of a large volume at pressures of saturation pн = 0.9–1.4 MPa and densities of the heat flux q = 5–35 kW/m2. For the first time the criterion equation for the calculation of the intensity of heat transfer during evaporation of ozone safe refrigerants on surfaces with high thermal conductivity sintered capillary-porous coating was obtained. Experimental data are summarized satisfactorily in a wide range of parameters of the porous layer, i.e. the pressure (pн = 0.9–1.4 MPa) and heat loads (q = 5–35 kW/m2). The ratio makes us possible to calculate the heat transfer coefficients within ±20 %. The dependence can be used in engineering calculations of the characteristics of the heat exchangers of the evaporative type. The coefficient of heat transfer during boiling of refrigerants on the investigated surfaces with the sintered capillary-porous coating, 4 times higher than on a smooth one and 1.5 times higher than on the finned surface, that allows us to come to a conclusion about the advantage of porous coatings. Boiling in capillary-porous coating leads to a decrease in weight and size of the installations due to the heat exchange intensification and the size of the tubes smaller as compared to the size of the finned ones.

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23

Otomo, Yusuke, Edgar Santiago Galicia, and Koji Enoki. "Enhancement of Subcooled Flow Boiling Heat Transfer with High Porosity Sintered Fiber Metal." Applied Sciences 11, no. 3 (January 29, 2021): 1237. http://dx.doi.org/10.3390/app11031237.

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We conducted experimental research using high-porosity sintered fiber attached on the surface, as a passive method to increase the heat flux for subcooled flow boiling. Two different porous thicknesses (1 and 0.5 mm) and one bare surface (0 mm) were compared under three different inlet subcooling temperatures (30, 50 and 70 K) and low mass flux (150–600 kg·m−2·s−1) using deionized water as the working fluid under atmospheric pressure. The test section was a rectangular channel, and the hydraulic diameter was 10 mm. The results showed that the heat flux on porous surfaces with a thickness of 1 and 0.5 mm increased by 60% and 40%, respectively, compared to bare surfaces at ΔTsat = 40 K at a subcooled temperature of 50 K and mass flux of 300 kg·m−2·s−1. An abrupt increase in the wall superheat was avoided, and critical heat flux (CHF) was not reached on the porous surfaces. The flow pattern and bubble were recorded with a high-speed camera, and the bubble dynamics are discussed.

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24

Zhukov, V. M., and I. L. Yarmak. "Nitrogen Pool Boiling on Porous Surfaces under Pulse Heat Input." Heat Transfer Research 28, no. 4-6 (1997): 246–54. http://dx.doi.org/10.1615/heattransres.v28.i4-6.40.

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25

Jiang, Y. Y., W. C. Wang, D. Wang, and B. X. Wang. "Boiling heat transfer on machined porous surfaces with structural optimization." International Journal of Heat and Mass Transfer 44, no. 2 (August 2001): 443–56. http://dx.doi.org/10.1016/s0017-9310(00)00057-0.

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26

Lin, Tao, Fangjun Hong, Fulong Cui, and Wentao Li. "Distributed jet array impingement boiling on particle sintered porous surfaces." Chinese Science Bulletin 65, no. 17 (November 26, 2019): 1760–69. http://dx.doi.org/10.1360/tb-2019-0393.

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27

Danilova, G. N., and A. V. Tikhonov. "R113 Boiling heat transfer modeling on porous metallic matrix surfaces." International Journal of Heat and Fluid Flow 17, no. 1 (February 1996): 45–51. http://dx.doi.org/10.1016/0142-727x(95)00071-w.

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28

Avedisian, C. T., and J. Koplik. "Leidenfrost boiling of methanol droplets on hot porous/ceramic surfaces." International Journal of Heat and Mass Transfer 30, no. 2 (February 1987): 379–93. http://dx.doi.org/10.1016/0017-9310(87)90126-8.

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29

Li, Qifan, Zhong Lan, Jiang Chun, Rongfu Wen, and Xuehu Ma. "Composite porous surfaces of microcavities for enhancing boiling heat transfer." International Journal of Heat and Mass Transfer 177 (October 2021): 121513. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2021.121513.

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30

Hsieh, Shou-Shing, and Tsung-Ying Yang. "Nucleate Pool Boiling From Coated and Spirally Wrapped Tubes in Saturated R-134a and R-600a at Low and Moderate Heat Flux." Journal of Heat Transfer 123, no. 2 (December 4, 2000): 257–70. http://dx.doi.org/10.1115/1.1351818.

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Pool nucleate boiling heat transfer experiments from coated surfaces with porous copper (Cu) and molybdenum (Mo) and spirally wrapped with helical wire on copper surfaces with micro-roughness immersed in saturated R-134a and R-600a were conducted. The influence of coating thickness, porosity, wrapped helical angle, and wire pitch on heat transfer and boiling characteristics including bubble parameters were studied. The enhanced surface heat transfer coefficients with R-600a as refrigerant found are 2.4 times higher than those of the smooth surfaces. Photographs indicate that the average number of bubbles and bubble departure diameters has been found to increase linearly with heat flux, while the bubble diameters exhibit opposite trend in both refrigerants. Furthermore, the heat transfer of the boiling process for the present enhanced geometry (coated and wrapped) was modeled and analyzed. The experimental data for plasma coating and spirally wrapped surfaces were correlated in terms of relevant parameters, respectively to provide a thermal design basis for engineering applications.

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31

Wang, Ya-Qiao, Jia-Li Luo, Yi Heng, Dong-Chuan Mo, and Shu-Shen Lyu. "PTFE-modified porous surface: Eliminating boiling hysteresis." International Communications in Heat and Mass Transfer 111 (February 2020): 104441. http://dx.doi.org/10.1016/j.icheatmasstransfer.2019.104441.

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32

Tartarini, P., G. Lorenzini, and M. R. Randi. "Experimental study of water droplet boiling on hot, non-porous surfaces." Heat and Mass Transfer 34, no. 6 (April 22, 1999): 437–47. http://dx.doi.org/10.1007/s002310050280.

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33

Ahmadi, Vahid Ebrahimpour, Mohammad Hadi Khaksaran, Ahmet Muhtar Apak, Alper Apak, Murat Parlak, Umur Tastan, Ismet Inonu Kaya, Abdolali Khalili Sadaghiani, and Ali Koşar. "Graphene-coated sintered porous copper surfaces for boiling heat transfer enhancement." Carbon Trends 8 (July 2022): 100171. http://dx.doi.org/10.1016/j.cartre.2022.100171.

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34

Fukusako, S., T. Komoriya, and N. Seki. "An Experimental Study of Transition and Film Boiling Heat Transfer in Liquid-Saturated Porous Bed." Journal of Heat Transfer 108, no. 1 (February 1, 1986): 117–24. http://dx.doi.org/10.1115/1.3246875.

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Experimental investigations of transition and film boiling in a liquid-saturated porous bed are reported. The porous bed contained in a vertical circular cylinder is made up of packed spherical beads whose diameters range from 1.0 to 16.5 mm, while the depth of the bed overlying the heating surface varies from 10 to 300 mm. Water and fluorocarbon refrigerants R-11 and R-113 are adopted as testing liquids. Special attention is focused on the effect of the diameter of spherical beads on boiling heat transfer in the transition boiling region. It is found that for the small bead diameters the steady boiling heat transfer rises monotonically with temperature from nucleate boiling through the film boiling region, without going through a local maximum.

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35

Shvetsov, D. A., A. N. Pavlenko, A. E. Brester, and V. I. Zhukov. "Experimental study of heat transfer during boiling in a thin layer of liquid on surfaces with structured porous coatings." Journal of Physics: Conference Series 2119, no. 1 (December 1, 2021): 012082. http://dx.doi.org/10.1088/1742-6596/2119/1/012082.

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Abstract The paper presents the results of the study of evaporation and boiling in a thin horizontal layer of liquid on microstructured surfaces in a wide range of changes in pressure. It is found that the thermal conductivity of materials of microstructured surfaces significantly affects the mechanism of steam removal from the pores and circulation of liquid along the heat transfer surface. It is determined that the pressure change leads to three regimes of heat transfer: evaporation, transition regime, and bubble boiling. The lowest values of the heat transfer coefficients and CHF were obtained in the transition regime; the highest ones were obtained in the bubble regime on both surfaces. Due to the higher thermal conductivity, the higher heat transfer coefficients and CHF were obtained on the bronze coating than on stainless steel over the entire pressure range.

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36

Avramenko, A. A., M. M. Kovetskaya, E. A. Kondratieva, and T. V. Sorokina. "HEAT TRANSFER FOR FILN BOILING OF A LIQUID ON A VERTICAL HEATED WALL IN A POROUS MEDIUM." Thermophysics and Thermal Power Engineering 43, no. 1 (March 4, 2021): 20–29. http://dx.doi.org/10.31472/ttpe.1.2021.3.

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The paper presents results of the modelling of heat transfer at film boiling of a liquid in a porous medium on a vertical heated wall. Such processes are observed at cooling of high-temperature surfaces of heat pipes, microstructural radiators etc. Heating conditions at the wall were the constant wall temperature or heat flux. An analytical solution was obtained for the problem of fluid flow and heat transfer using the porous medium model in the Darcy-Brinkman. It was shown that heat transfer at film boiling in a porous medium was less intensive than in the absence of a porous medium (free fluid flow) and further decreased with the decreasing permeability of the porous medium. A sharp decrease in heat transfer was observed for the Darcy numbers lower than five. The analytical predictions of heat transfer coefficients qualitatively agreed with the data [14] though demonstrated lower values of heat transfer coefficients for the conditions of the constant wall temperature and constant wall heat flux.

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37

Kuznetsov, D. V., and A. N. Pavlenko. "Intensification of heat transfer during pool boiling of nitrogen on surfaces with capillary-porous coatings produced by 3D-printing." Journal of Physics: Conference Series 2039, no. 1 (October 1, 2021): 012013. http://dx.doi.org/10.1088/1742-6596/2039/1/012013.

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Abstract The study of heat transfer, critical heat fluxes (CHF) and evaporation dynamics at pool boiling of nitrogen at atmospheric and low pressures in a stationary heat generation regimes was performed. The two flat cooper heaters with porous coatings of various structural parameters obtained by additive 3D-printing as well as smooth one were used as working surfaces. According to obtained results such coatings significantly effect on pool boiling increasing up to six times the heat transfer coefficients (HTC) in comparison with uncoated sample. For all investigated heaters and pressures, visualization of boiling was performed using a video camera from which data on the bubble departure diameters and estimates of the active nucleation site density were obtained.

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38

Cieśliński, Janusz T., and Tomasz Z. Kaczmarczyk. "Pool boiling of nanofluids on rough and porous coated tubes: experimental and correlation." Archives of Thermodynamics 35, no. 2 (June 1, 2014): 3–20. http://dx.doi.org/10.2478/aoter-2014-0010.

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Abstract The paper deals with pool boiling of water-Al2O3 and water- Cu nanofluids on rough and porous coated horizontal tubes. Commercially available stainless steel tubes having 10 mm outside diameter and 0.6 mm wall thickness were used to fabricate the test heater. The tube surface was roughed with emery paper 360 or polished with abrasive compound. Aluminium porous coatings of 0.15 mm thick with porosity of about 40% were produced by plasma spraying. The experiments were conducted under different absolute operating pressures, i.e., 200, 100, and 10 kPa. Nanoparticles were tested at the concentration of 0.01, 0.1, and 1% by weight. Ultrasonic vibration was used in order to stabilize the dispersion of the nanoparticles. It was observed that independent of operating pressure and roughness of the stainless steel tubes addition of even small amount of nanoparticles augments heat transfer in comparison to boiling of distilled water. Contrary to rough tubes boiling heat transfer coefficient of tested nanofluids on porous coated tubes was lower compared to that for distilled water while boiling on porous coated tubes. A correlation equation for prediction of the average heat transfer coefficient during boiling of nanofluids on smooth, rough and porous coated tubes is proposed. The correlation includes all tested variables in dimensionless form and is valid for low heat flux, i.e., below 100 kW/m2.

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Liu, Jing Lei, Yu Lin Dai, Xiang Ming Xia, Hong Xu, and Xue Sheng Wang. "Manufacture and Application of High Efficiency Boiling Tube for Heat Exchanger." Advanced Materials Research 236-238 (May 2011): 1640–44. http://dx.doi.org/10.4028/www.scientific.net/amr.236-238.1640.

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Surface with micro-porous layer can enhance the boiling heat transfer efficiency of tube. The novel nucleate boiling tubes were manufactured by sinter-bonding metal particles on the outside surface. Two conventional bare tube reboilers were revamped with the novel tubes. Industrial application revealed that the revamps effectively increased the heat duty of reboilers with small heat transfer area and reduced heat transfer temperature difference across the heat exchanger. Porous surface tube was beneficial to heat transfer and operating cost.

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Li, Calvin H. "Nucleate Boiling Heat Transfer on Sintered Copper Porous Structure Module Cone Surfaces." Journal of Thermophysics and Heat Transfer 25, no. 1 (January 2011): 186–92. http://dx.doi.org/10.2514/1.49106.

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Алексеик, Ольга Сергеевна, and Владимир Юрьевич Кравец. "Boiling heat transfer on smooth and porous surfaces in the limitted space." Eastern-European Journal of Enterprise Technologies 1, no. 8(67) (February 10, 2014): 3. http://dx.doi.org/10.15587/1729-4061.2014.20316.

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Wojcik, Tadeusz M., and Mieczyslaw E. Poniewski. "Experimental Investigation and Modeling of Boiling Heat Transfer Hysteresis on Porous Surfaces." Journal of Enhanced Heat Transfer 15, no. 4 (2008): 289–301. http://dx.doi.org/10.1615/jenhheattransf.v15.i4.20.

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Vasiliev, L. L., A. S. Zhuravlyov, A. V. Ovsyannik, M. N. Novikov, and L. L. Vasiliev, Jr. "Heat Transfer in Propane Boiling on Surfaces with a Capillary-Porous Structure;." Heat Transfer Research 35, no. 5-6 (2004): 436–43. http://dx.doi.org/10.1615/heattransres.v35.i56.130.

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Zarnescu, Vlad, Ralph Webb, and Liang-Han Chien. "Effect of Oil On the Boiling Performance of Structured and Porous Surfaces." HVAC&R Research 6, no. 1 (January 1, 2000): 41–53. http://dx.doi.org/10.1080/10789669.2000.10391249.

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Wei, Wu, Du Jian-Hua, and Wang Bu-Xuan. "BOILING HEAT TRANSFER ON SURFACES COATED BY POROUS WICK WITH VAPOR CHANNELS." Microscale Thermophysical Engineering 5, no. 4 (October 2001): 277–84. http://dx.doi.org/10.1080/10893950152646731.

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Ji, Xianbing, Jinliang Xu, Ziwei Zhao, and Wolong Yang. "Pool boiling heat transfer on uniform and non-uniform porous coating surfaces." Experimental Thermal and Fluid Science 48 (July 2013): 198–212. http://dx.doi.org/10.1016/j.expthermflusci.2013.03.002.

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47

Shen, Biao, Takeshi Hamazaki, Kohei Kamiya, Sumitomo Hidaka, Koji Takahashi, Yasuyuki Takata, Junji Nunomura, Akihiro Fukatsu, and Yoichiro Betsuki. "Persistent reduction of boiling incipience of ethanol on biphilic porous textured surfaces." International Journal of Multiphase Flow 142 (September 2021): 103739. http://dx.doi.org/10.1016/j.ijmultiphaseflow.2021.103739.

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Young Lee, Chi, Md Mainul Hossain Bhuiya, and Kwang J. Kim. "Pool boiling heat transfer with nano-porous surface." International Journal of Heat and Mass Transfer 53, no. 19-20 (September 2010): 4274–79. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2010.05.054.

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Xu, Pengfei, Qiang Li, and Yimin Xuan. "Enhanced boiling heat transfer on composite porous surface." International Journal of Heat and Mass Transfer 80 (January 2015): 107–14. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2014.08.048.

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Thangavelu, Nithyanandam, Kumar Duraisamy, Sridharan Mohan, and Dinesh Sundaresan. "Influence of surface roughness and Wettability of novel surface on nucleate boiling performance in deionised water at atmospheric pressure." Thermal Science, no. 00 (2022): 62. http://dx.doi.org/10.2298/tsci211202062t.

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Pool boiling is one of the very suitable techniques for an efficient thermal management system dealing with two phases. The present work deals with the experimental exploration of critical heat flux for safety concern and heat transfer coefficient related to the performance point of view in nucleate boiling regime of pool boiling system. The copper substrate was coated with porous copper nano particles by sputtering technique to the thicknesses of 250 nm, 500 nm and 750 nm. The surface characteristics of the copper nano coated surfaces have been analysed as a result of wettability, surface roughness and microstructure. The contact angle goniometer, stylus profilometer, X-ray diffractometer and scanning electron microscope have been employed to analyze the surface structure. The maximum augmentation of critical heat flux was 59% for the thickness of 750 nm as compared to plain copper substrate. A 99% increase in the heat transfer coefficient was achieved for 750 nm thickness surface in comparison with the plain copper surface. The tremendous augmentation in critical heat flux and heat transfer coefficient was achieved due to wetting and rewetting properties of the deionized water on the copper nano coated surfaces. The capillary action on the copper nano structure improves the fluid supply to the test surface and removes the heat at low wall superheat than the plain copper surface. The average roughness of the copper nano coated surface augments the heat transfer area which tends to enhance the performance factor significantly.

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