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Convective heat transfer and resistance characteristics of nanofluids with cylindrical particles
Yuan Fangyang 1,Lin Jianzhong 2 * #,Ku Xiaoke 3
1.School of Aeronautics and Astronautics, State Key Laboratory of Fluid Power and Mechatronic System, Zhejiang University, Hangzhou 310027, China
2.School of Aeronautics and Astronautics, State Key Laboratory of Fluid Power and Mechatronic System, Zhejiang University, Hanzghou 310027, China
3.School of Aeronautics and Astronautics, State Key Laboratory of Fluid Power Mechatronic System, Zhejiang University, Hangzhou 310027, China
*Correspondence author
#Submitted by
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Funding: This work has been financially supported by the Doctoral Program of Higher Education in China （No.20120101110121) and the National Natural Science Foundation of China）
Opened online:24 May 2016
Accepted by: none
Citation: Yuan Fangyang,Lin Jianzhong,Ku Xiaoke.Convective heat transfer and resistance characteristics of nanofluids with cylindrical particles[OL]. [24 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4689608
 
 
Numerical research on convective heat transfer and resistance characteristics of TiO2/water nanofluids with cylindrical particles in laminar channel flow are performed by solving the governing equations of fluid flow with the additional term of cylindrical nanoparticles, the equation of probability density functions for cylindrical nanoparticle orientation, and general dynamics equation for nanoparticle volume concentration. The non-uniformity of nanoparticle distribution is considered and the effects of both particle volume concentration and Reynolds number on friction factor and local Nusselt number are mainly analyzed. The results show that the friction factor of nanofluid flow increases with an increase in particle volume concentration. And the friction factor decreases with increasing Reynolds number and is not dependent on the volume concentration at high Reynolds numbers. The Nusselt number declines when the Reynolds number decreases, and finally approaches an asymptotic value after the Reynolds number falls to a certain value. The Nusselt number is higher in the entrance region than at the downstream locations, and will become steady at somewhere downstream when the flow is thermally and hydraulically developed.
Keywords:Fluid mechanics; cylindrical particles; nanofluids; resistance; heat transfer
 
 
 

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