Experimental study on heat transfer characteristics of nanofluids impacted jet

doi:10.16085/j.issn.1000-6613.2016.08.05

Abstract

Abstract: In this paper,comprehensive performance of impinging jet cooling system heat exchanger was experimentally studied using nanofluids. The heat transfer efficiencies were compared for nanofluids of different flow rates,jet height and types. The results revealed that heat transfer efficiency significantly increased with the introduction of nanofluids in jet,but,when the mass percentage of nanofluids exceeded of 0.5%,the heat transfer coefficient did not change significantly. For different types of nanofluids:Cu- water,Al₂O₃-water,Al-water nanofluids,the highest heat transfer efficiency was observed for Cu- water. In addition,there was a particular jet height,where the maximum heat transfer coefficient could be reached. The results would be practically valuable in designing and manufacturing light and efficient heat exchanger.

Key words: nanoparticles, multiphase flow, heat transfer, impinging jet

摘要： 以纳米流体为工质对冲击射流冷却系统的综合性能进行实验，主要研究了添加纳米颗粒的纳米流体与水在不同流速、不同射流高度等条件下冲击射流的传热效率，同时也对不同种类的纳米流体的换热效率进行了对比。结果表明：对于添加了纳米颗粒的冲击射流冷却系统，传热效率得到显著提高，但当质量分数达到0.5%时，传热系数变化不明显。对于不同种类的纳米流体：Cu-水、Al₂O₃-水和Al-水纳米流体，其中Cu-水的换热效率最高，存在一个特定的射流高度，使传热系数达到最大值。研究结果对设计制造轻型紧凑的高效换热器有实用的工程价值。

关键词: 纳米粒子, 多相流, 传热, 冲击射流

CLC Number:

TK121

SUN Bin, QU Yi, YANG Di. Experimental study on heat transfer characteristics of nanofluids impacted jet[J]. Chemical Industry and Engineering Progree, 2016, 35(08): 2334-2341.

孙斌, 曲艺, 杨迪. 纳米流体冲击射流换热特性实验[J]. 化工进展, 2016, 35(08): 2334-2341.

References

[1] WANG J C. L- and U- shaped heat pipes thermal modules with twin fans for cooling of electronic system under variable heat source areas[J]. Heat & Mass Transfer,2014,50(11):1487-1498.
[2] SUFIAN S F,ABDULLAH M Z,MOHAMED J J. Effect of synchronized piezoelectric fans on microelectronic cooling performance [J]. International Communications in Heat & Mass Transfer,2013,43(4):81-89.
[3] BRADBURY L J S. The structure of a self-preserving turbulent plane jet[J]. Journal of Fluid Mechanics,1965,23(1):31-64.
[4] BAONGA J B,LOUAHLIA-GUALOUS H,IMBERT M. Experimental study of the hydrodynamic and heat transfer of free liquid jet impinging a flat circular heated disk[J]. Applied Thermal Engineering,2006,26(11/12):1125-1138.
[5] KATTI V,PRABHU S V. Experimental study and theoretical analysis of local heat transfer distribution between smooth flat surface and impinging air jet from a circular straight pipe nozzle[J]. International Journal of Heat & Mass Transfer,2008,51:4480-4495.
[6] NAPHON P,WONGWISES S. Investigation on the jet liquid impingement heat transfer for the central processing unit of personal computers[J]. International Communications in Heat & Mass Transfer,2010,37(7):822-826.
[7] GUO D,WEI J J,ZHANG Y H. Enhanced flow boiling heat transfer with jet impingement on micro-pin-finned surfaces[J]. Applied Thermal Engineering,2011,31(11):2042-2051.
[8] CHOI S U S. Enhancing thermal conductivity of fluids with nanoparticles[J]. ASME,1995,231:99-106.
[9] WANG X,XU X,CHOI S U S. Thermal conductivity of nanoparticle -fluid mixture[J]. Journal of Thermophysics & Heat Transfer,1999,13(13):474-80.
[10] 凌智勇,邹涛,丁建宁,等. 纳米流体黏度特性[J]. 化工学报,2012,63(5):1409-1414.
[11] 李强,宣益民. 纳米流体热导率的测量[J]. 化工学报,2003,54(1):42-46.
[12] WUSIMAN K,JEONG H,TULUGAN K,et al. Thermal performance of multi-walled carbon nanotubes (MWCNTs) in aqueous suspensions with surfactants SDBS and SDS[J]. International Communications in Heat & Mass Transfer,2013,41(1):28-33.
[13] HADDAD Z,ABID C,OZTOP H F,et al. A review on how the researchers prepare their nanofluids[J]. International Journal of Thermal Sciences,2014,76(76):168-189.
[14] 徐小娇,刘妮,王玉强,等. 纳米流体悬浮液稳定性的最新研究进展[J]. 流体机械,2012,40(10):46-49.
[15] 毋伟,陈建峰,卢寿慈. 超细粉体表面修饰[M]. 北京:化学工业出版,2004:301-301.
[16] SUNDAR L S,NAIK M T,SHARMA K V,et al. Experimental investigation of forced convection heat transfer and friction factor in a tube with Fe₃O₄ magnetic nanofluid[J]. Experimental Thermal & Fluid Science,2012,37(2):65-71.
[17] VENKATESHAN S P. Mechanical Measurements[M]. 2nd Edition. New York:John Wiley & Sons,Ltd.,2015:3-45.
[18] TRCALA M,ČERMÁK J. Nonlinear finite element analysis of thermal inertia in heat-balance sap flow measurement[J]. International Journal of Thermal Sciences,2014,76(2):200-207.
[19] WUSIMAN K,JEONG H,TULUGAN K,et al. Thermal performance of multi-walled carbon nanotubes (MWCNTs) in aqueous suspensions with surfactants SDBS and SDS [J]. International Communications in Heat & Mass Transfer,2013,41(1):28-33.
[20] LI Q,XUAN Y,YU F. Experimental investigation of submerged single jet impingement using Cu-water nanofluid[J]. Applied Thermal Engineering,2012,36(2):426-433.
[21] KELLY K L,CORONADO E,LIN L Z,et al. The optical properties of metal nanoparticles:the influence of size,shape,and dielectric environment[J]. Cheminform,2003,34(16):668-677.