Heat transfer characteristics of micro-encapsulated phase change material suspension in mini-tubes

doi:10.11949/j.issn.0438-1157.20160567

Abstract

Abstract:

The heat transfer characteristics of 10% micro-encapsulated phase change material suspension(MEPCMS) and distilled water in the mini-tube of radius 1 mm and 2 mm were investigated. It appears that:for Reynolds number ranging from 400 to 1000, the local Nusselt number of MEPCMS and water in 1 mm tube is smaller than it in 2 mm tube. From the analysis of reason it is mainly because the thickness of 1 mm tube is larger than 2 mm tube resulting in stronger axial thermal conductivity. The distilled water joined in MEPCM in 1 mm tube can enhance the heat transfer between the fluid and tube wall and the local Nusselt number increase with Reynolds number increasing. While the 10% micro-encapsulated phase change material suspension in 2 mm shows weaker heat transfer characteristics than distilled water and the local Nusselt number decrease with Reynolds number increasing.

Key words: distilled water, phase change material, micro-capsule, suspension, circular tube, heat transfer

摘要：

通过实验研究了去离子水和10%浓度相变微胶囊悬浮液在1 mm、2 mm管道内换热特性，结果表明：在Reynolds数Re=400～1000，1 mm管道内去离子水和10%浓度相变微胶囊悬浮液局部Nusselt数Nu_x均比2 mm 管道的小，分析其原因，这主要是由于1 mm管道壁厚管径比大导致的轴向导热比2 mm管道强引起的；1 mm管道内去离子水中加入相变微胶囊颗粒能够增强与管壁之间对流换热，且随着Re的增加，Nu_x增大，而2 mm管道内去离子水中加入相变微胶囊颗粒，构成10%浓度相变微胶囊悬浮液，表现出比水更差的换热特性，并且随着Re的增加Nu_x降低。

关键词: 去离子水, 相变材料, 微胶囊, 悬浮液, 圆管, 换热

CLC Number:

TK124

ZHONG Xiaolong, LIU Dong, XU Hailun. Heat transfer characteristics of micro-encapsulated phase change material suspension in mini-tubes[J]. CIESC Journal, 2016, 67(S1): 203-209.

钟小龙, 刘东, 胥海伦. 微小管道内相变微胶囊悬浮液换热特性[J]. 化工学报, 2016, 67(S1): 203-209.

References 20

[1]	YUA X F, ZHANG C P, TENG J T, et al. A study on the hydraulic and thermal characteristics in fractal tree-like micro channels by numerical and experimental methods[J]. International Journal of Heat and Mass Transfer, 2012, 55(25/26):7499-7507.
[2]	CHEN Y P, CHENG P. An experimental investigation on the thermal efficiency of fractal tree-like micro channel nets[J]. International Communications in Heat and Mass Transfer, 2005, 32(7):931-938.
[3]	XU J L, SONG Y X, ZHANG W. Numerical simulations of interrupted and conventional micro channel heat sinks[J]. International Journal of Heat and Mass Transfer, 2008, 51(25/26):5906-5917.
[4]	SUI Y, TEO C J, LEE P S, et al. Fluid flow and heat transfer in wavy micro channels[J]. International Journal of Heat and Mass Transfer, 2010, 53(13/14):2760-2772.
[5]	GOEL M, ROY S K, SENGUPTA S. Laminar forced convection heat transfer in micro encapsulated phase change material suspensions[J]. International Journal of Heat and Mass Transfer, 1994, 37(4):593-604.
[6]	CHOI E, CHO Y I, LORSCH H G. Forced convection heat transfer with phase change material slurries:turbulent flow in a circular tube[J]. International Journal Heat Mass Transfer, 1994, 37:207-215.
[7]	MULLIGAN J C, COLVIN D P, BRYANT Y G. Micro encapsulated phase change material suspensions for heat transfer in spacecraft thermal systems[J]. Journal of Spacecraft and Rockets, 1996,33(2):278-284.
[8]	HIDEO INABA, KIM M J, HORIBE A. Melting heat transfer characteristics of micro encapsulated phase change material slurries with plural micro capsules having different diameters[J]. Journal of Heat Transfer, 2004, 126(8):558-565.
[9]	郝英立, KHAN A, TAO Y X.圆管内潜热型功能流体对流换热的实验研究[J].工程热物理学报, 2005, 26(2):283-285. HAO Y L, KHAN A, TAO Y X. Experimental study on the convection heat transfer of latent functionally thermal fluid in a circular tube[J]. Journal of Engineering Thermophysics, 2005, 26(2):283-285.
[10]	王利, 赵兵全, 赵镇南.微胶囊相变悬浮液传热特性的实验研究[J].煤气与热力, 2006, 26(12):66-70 WANG L, ZHAO B Q, ZHAO Z N. Experimental study of the heat transfer characteristics of micro encapsulated phase change material suspension[J]. Gas & Heat, 2006, 26(12):66-70.
[11]	WANG X C, NIU J L, LI Y, et al. Flow and heat transfer behaviors of phase change material slurries in a horizontal circular tube[J]. International Journal Heat Mass Transfer, 2007, 50(13/14):2480-2491.
[12]	RAO Y, DAMMEL F, STEPHAN P, et al. Convective heat transfer characteristics of micro encapsulated phase change material suspensions in mini-channels[J]. Heat and Mass Transfer, 2007, 44(2):175-186.
[13]	陈斌娇, 王馨, 曾若浪,等. 相变微胶囊悬浮液层流强迫对流换热实验研究[J]. 太阳能学报, 2009, 30(8):1018-1022. CHEN B J, WANG X, ZENG R L, et al. Experimental research on laminar forced convection heat transfer characteristics of micro encapsulated phase change material suspension[J]. Acta Energiae Solaris Sinica, 2009, 30(8):1018-1022.
[14]	鲁进利, 郝英立.细小尺度下潜热型功能热流体压降与传热特性[J].化工学报, 2010, 61(6):1385-1392 LU J L, HAO Y L. Pressure drop and heat transfer characteristics of latent functional thermal fluid in mini-scale[J]. Journal of Chemical Engineering, 2010, 61(6):1385-1392.
[15]	王亮, 林贵平, 王涛, 等. 潜热型功能热流体在扁管内的对流换热实验[J]. 航空学报, 2011, 32(11):2124-2130. WANG L, LIN G P, WANG T, et al. Convective heat transfer characteristic of latent functionally thermal fluid in a flat tube[J]. Acta Aeronautica et Astronautica Sinica, 2011, 32(11):2124-2130.
[16]	MONICA D, ANA L, JAVIER M, et al. Experimental analysis of a micro encapsulated PCM slurry as thermal storage system and as heat transfer fluid in laminar flow[J]. Applied Thermal Engineering, 2012, 36:370.
[17]	ROY S K, AVANIC B L. Turbulent heat transfer with phase change material suspensions[J]. International Journal of Heat and Mass Transfer, 2001, 41(12):2277-2285.
[18]	HU X X, ZHANG Y P. Novel insight and numerical analysis of convective heat transfer enhancement with micro encapsulated phase change material slurries:laminar flow in a circular tube with constant heat flux[J]. International Journal of Heat and Mass Transfer, 2002, 45(15):3163-3172.
[19]	LEE P S, GARIMELLA S V, LIU D. Investigation of heat transfer in rectangular micro channels[J]. International Journal of Heat and Mass Transfer, 2005, 48(9):1688-1704.
[20]	ZHUO LI, HE Y L, TANG G H, et al. Experimental and numerical studies of liquid flow and heat transfer in micro tubes[J]. International Journal of Heat and Mass Transfer, 2007, 50(17/18):3477-3460.