Experimental Investigation of Convective Heat Transfer in Circulating Water System
The laminar convective heat transfer behavior of CuO nanoparticle dispersions in water with three different particle sizes (23 nm, 51 nm, and 76 nm) is investigated experimentally in a flow loop with constant heat flux. The main purpose of this study is to evaluate the effect of particle size on convective heat transfer in laminar region. The experimental results show that the suspended nanoparticles remarkably increase the convective heat transfer coefficient of the base fluid, and the nanofluid with 23nm particles shows higher heat transfer coefficient than nanofluids containing the other two particle sizes about 10％ under the same Re. Based on the effective medium approximation and the fractal theory, the effective thermal conductivity of suspension is obtained. It is shown that if the new effective thermal conductivity correlation of the nanofluids is used in calculating the Prandtl and Nusselt numbers, the new correlation accurately reproduces the convective heat transfer behavior in tubes.
convective heat transfer coefficient nanofluid laminar flow viscosity
Shaobo Zhang
Guangdong Electric Power Design Institute, Guangzhou, China
国际会议
沈阳
英文
439-444
2011-11-22（万方平台首次上网日期，不代表论文的发表时间）