Single-phase heat transfer characteristics of R32 flowing through metallic foam filled channel

doi:10.11949/j.issn.0438-1157.20161218

Abstract

Abstract:

By electric heating method of metal foam, temperature distribution of R32 and porous fibre were measured and the heat transfer coefficients between them were obtained in metallic foam filled channels. The experiments were conducted for R32 in a metallic foam filled tube with an internal diameter of 5 mm, the 0.95 porosity and 15, 45 PPI pore densities, under the conditions of fluid temperature of 280—325 K, heat flux ranging of 1—18 kW·m^-2, and mass flux ranging of 20—200 kg·m^-2·s^-1. Following conclusions could be summarized from the results of the experiments. The heat transfer coefficients of R32 flowing through porous fibres increased with the increase of Re and pore densities. The deviation between predicted values of heat transfer coefficient based on conventional correlation and experimental data reached to-35%—-67%, that is, the conventional correlation is not suitable to predict the convective heat transfer between the porous fibre and the fluid.

Key words: metal foam, R32, heat transfer coefficient

摘要：

在泡沫金属纤维两端布置电极，采用电加热方法，实验测量了填充泡沫金属的管内R32流体和泡沫金属纤维的温度分布，得到了泡沫纤维与流体之间的对流传热系数。实验条件为：实验段管径5 mm，泡沫铜孔隙率0.95，孔隙密度15、45 PPI，流体温度280~325 K，热通量1~18 kW·m^-2，质量流速20~200 kg·m^-2·s^-1。实验及模拟结果表明：泡沫纤维与单相R32的对流传热系数随Re、泡沫铜的孔隙密度的增大而增大。基于流体外掠光滑圆管换热实验数据的Zukauskas经验关联式的预测值与泡沫金属纤维和R32流体之间的对流传热系数的实测值偏差为-35%~-67%，即该关联式不适用于泡沫金属纤维与流体之间的对流传热系数的预测。

关键词: 泡沫金属, R32, 传热系数

CLC Number:

PAK Yongil, WU Xiaomin, MA Qiang, LI Tong. Single-phase heat transfer characteristics of R32 flowing through metallic foam filled channel[J]. CIESC Journal, 2017, 68(6): 2275-2279.

朴勇日, 吴晓敏, 马强, 李通. 填充泡沫铜圆管内R32单相流动换热[J]. 化工学报, 2017, 68(6): 2275-2279.

References 26

[1]	LU W, ZHANG T, YANG M. Analytical solution of forced convective heat transfer in parallel-plate channel partially filled with metallic foams[J]. International Journal of Heat and Mass Transfer, 2016, 100: 718-727.
[2]	CALMIDI V V, MAHAJANR L. Forced convection in high porosity metal foams[J]. Journal of Heat Transfer, 2000, 122(3): 557-565.
[3]	ZHAO C Y. Review on thermal transport in high porosity cellular metal foams with open cells[J]. International Journal of Heat and Mass Transfer, 2012, 55(13/14): 3618-3632.
[4]	HU H T, ZHU Y, DING G L, et al. Effect of oil on two-phase pressure drop of refrigerant flow boiling inside circular tubes filled with metal foam[J]. International Journal of Refrigeration, 2013, 36(2): 516-526.
[5]	JI X B, XU J L. Experimental study on the two-phase pressure drop in copper foams[J]. Heat Mass Transfer, 2012, 48(1): 153-164.
[6]	MAO S L, LOVE N, LEANOS A, et al. Correlation studies of hydrodynamics and heat transfer in metal foam heat exchangers[J]. Applied Thermal Engineering, 2014, 71(1): 104-118.
[7]	ZHU Y, HU H T, SUN S, et al. Heat transfer measurements and correlation of refrigerant flow boiling in tube filled with copper foam[J]. International Journal of Refrigeration, 2014, 38: 215-226.
[8]	MADANI B, TADRIST L, TOPIN F. Experimental analysis of upward flow boiling heat transfer in a channel provided with copper metallic foam[J]. Applied Thermal Engineering, 2013, 52(2): 336-344.
[9]	?SMAIL S. Numerical investigation of heat transfer and fluid flow behaviors of a block type graphite foam heat sink inserted in a rectangular channel[J]. Applied Thermal Engineering, 2015, 78(5): 605-615.
[10]	WU Z Y, CALIT C, FLAMANT G, et al. Coupled radiation and flow modeling in ceramic foam volumetric solar air receivers[J]. Solar Energy, 2011, 85(9): 2374-2385.
[11]	ZHAO C Y, LU W, TASSOU S A. Thermal analysis on metal-foam filled heat exchangers (Ⅱ): Tube heat exchangers[J]. International Journal of Heat and Mass Transfer, 2006, 49(15/16): 2762-2770.
[12]	GHOLAMREZA B A, MOON C, KIM K C. Experimental study on single-phase heat transfer and pressure drop of refrigerants in a plate heat exchanger with metal-foam-filled channels[J]. Applied Thermal Engineering, 2016, 102(5): 423-431.
[13]	LEONG K C, LI H Y, JIN LW, et al. Numerical and experimental study of forced convection in graphite foams of different configurations[J]. Applied Thermal Engineering, 2010, 30(5): 520-532.
[14]	ZHAO C Y, LU W, TASSOU S A. Flow boiling heat transfer in horizontal metal-foam tubes[J]. Journal of Heat Transfer, 2009, 131(12): 1210021-1210027.
[15]	HSIEH W H, LU S F. Heat-transfer analysis and thermal dispersion in thermally-developing region of a sintered porous metal channel[J]. International Journal of Heat and Mass Transfer, 2000, 43(16): 3001-3011.
[16]	MAHDI R A, MOHAMMED H A, MUNISAMY K M, et al. Review of convection heat transfer and fluid flow in porous media with nanofluid[J]. Renewable and Sustainable Energy Reviews, 2015, 41(C): 715-734.
[17]	DIETRICH B. Heat transfer coefficients for solid ceramic sponges-experimental results and correlation[J]. International Journal of Heat and Mass Transfer, 2013, 61(6): 627-637.
[18]	KOUICHI K, SAN S Y. Heat transfer correlations for open-cellular porous materials[J]. International Communications in Heat and Mass Transfer, 2005, 32(7): 947-953.
[19]	ZHU Y, WU X M, WEI Z F. Heat transfer characteristics and correlation for CO2/propane mixtures flow evaporation in a smooth mini tube[J]. Applied Thermal Engineering, 2015, 81: 253-261.
[20]	WU X M, ZHU Y, HUANG X J. Influence of 0° helix angle micro fins on flow and heat transfer of R32 evaporating in a horizontal mini multichannel flat tube[J]. Experimental Thermal and Fluid Science, 2015, 68: 669-680.
[21]	WU X M, ZHU Y, TANG Y J. New experimental data of CO2 flow boiling in mini tube with micro fins of zero helix angle[J]. International Journal of Refrigeration, 2015, 59: 281-294.
[22]	CALMIDI V V. Transport phenomena in high porosity fibrous metal foams[D]. Colorado: University of Colorado, 1998.
[23]	ZUKAUSKAS A A. Convective heat transfer in cross-flow[M]//Handbook of Single-Phase Heat Transfer. New York: John Wiley & Sons Inc., 1987: 23-205.
[24]	LI H Y, LEONG K C. Experimental and numerical study of single and two-phase flow and heat transfer in aluminum foams[J]. International Journal of Heat and Mass Transfer, 2011, 54(23/24): 4904-4912.
[25]	LIU Z Y, YAO Y P, WU H Y. Numerical modeling for solid-liquid phase change phenomena in porous media: shell-and-tube type latent heat thermal energy storage[J]. Applied Energy, 2013, 112: 1222-1232.
[26]	LU W, ZHAO C Y, TASSOU S A. Thermal analysis on metal-foam filled heat exchangers (Ⅰ): Metal-foam filled pipes[J]. International Journal of Heat and Mass Transfer, 2006, 49(15/16): 2751-2761.