壁温周期振荡条件下方腔内纳米流体自然对流换热研究
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摘要
对充满Cu-水纳米流体方腔内的非稳态自然对流换热进行了数值研究。综合研究了不同振荡波形下,纳米颗粒的体积份额和振荡波幅A对自然对流换热的影响。结果表明:在水中添加Cu纳米颗粒可以强化水的自然对流换热;体积份额和振荡波幅A的增大都加强纳米流体自然对流换热,但是不同振荡波形,加强程度不同并提出振荡面积S的概念,即振荡波形与其平均值围成的面积,曲线拟合显示时均努塞尔特数Nu随S增大呈指数曲线上升。
The full of Cu-water nanofluids the unsteady natural convection heat transfer in a square cavity numerical study. Comprehensive research under different oscillation waveform, the volume of nanoparticles share and oscillation amplitude Aimpact on natural convection heat transfer. The results showed that adding Cu nanoparticles in water can strengthen the natural convection heat transfer in a water; volume share and the increase of oscillation amplitude A strengthening nanofluids natural convection heat transfer, but different oscillation waveform, strengthening degree and puts forward the concept of oscillation in S, namely the oscillation waveform into the area, with its average curve fitting showed the nusselt number increases with S exponential curve.
The full of Cu-water nanofluids the unsteady natural convection heat transfer in a square cavity numerical study. Comprehensive research under different oscillation waveform, the volume of nanoparticles share and oscillation amplitude Aimpact on natural convection heat transfer. The results showed that adding Cu nanoparticles in water can strengthen the natural convection heat transfer in a water; volume share and the increase of oscillation amplitude A strengthening nanofluids natural convection heat transfer, but different oscillation waveform, strengthening degree and puts forward the concept of oscillation in S, namely the oscillation waveform into the area, with its average curve fitting showed the nusselt number increases with S exponential curve.
引文
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[15]J A Eastman,S U S Choi,S Li,et al.Anomalously increased effective thermal conductivity of ethylene glycol-based nanofluids containing copper nanoparticles[J].Applied Physics Letters,2001,78(6):718-720.
[2]A Bejan,A D Kraus.Heat Transfer book[M].New York:Wiley,2003.
[3]S U S Chio.Enhancing thermal conductivity of fluids with nanoparticles//Signer DA,Wang HP[J].Developments and Applications of Non-Newtonian Flows,New York:ASME,1995:99-105.
[4]H A Mohammed,G Bhaskaran,N H Shuaib,et al.Heat transfer and fluid flow characteristics in microchannels heat exchanger using nanofluids:A review[J].Renewable and Sustainable Energy Reviews,2011,15:1502-1512.
[5]S M S Murshed,C A N D Castro,M J V Lourenco,et al.A review of boiling and convective heat transfer with nanofluids[J].Renewable and Sustainable Energy Reviews,2011,15:2342-2354.
[6]韩喜莲,马兵善,孟曦.周期性边界变化条件下封闭腔内纳米流体的流动模拟[J].制冷与空调,2012,26(6):605-609.
[7]K Khanafer,K Vafai,M Lightstone.Buoyancy-driven heat transfer enhancement in a two-dimensional enclosure utilizing nanofluids[J].International Journal of Heat and Mass Transfer,2003,46(19):3639-2653.
[8]E B??üt.Natural convection of water-based nanofluids in an inclined enclosure with a heat source[J].International Journal of Thermal Sciences,2009,48(11):2063-2073.
[9]H F Oztop,E Abu-Nada.Numerical study of natural convection in partially heated rectangular enclosures filled nanofluids[J].International Journal of Heat and Fluid Flow,2008,29:1326-1336.
[10]N Putra,W Roetzel,S K Das.Natural convection of nanofluids[J].Heat and Mass Transfer,2003,39(8-9):775-784.
[11]M Kazmierczak,Z Chinoda.Buoyancy-driven flow in an enclosure with time periodic boundary conditions[J].International Journal of Heat and Mass Transfer,1992,35(6):1507-1518.
[12]B Ghasemi,S M Aminossadati.Periodic natural convection in a nanofluids-filled enclosure with oscillating heat flux[J].International Journal of Thermal Sciences,2010,49(1):1-9.
[13]W Yu,S U S Choi.The role of interfacial layers in the enhanced thermal conductivity of nanofluids:a renovated Maxwell model[J].Journal of Nanoparticles Research,2003,5(1-2):167-171.
[14]H C Brinkman.The viscosity of concentrated suspensions and solutions[J].Journal of Chemical Physics,1952,20(4):571-581.
[15]J A Eastman,S U S Choi,S Li,et al.Anomalously increased effective thermal conductivity of ethylene glycol-based nanofluids containing copper nanoparticles[J].Applied Physics Letters,2001,78(6):718-720.