纳米流体对流换热的实验研究

建立了测量纳米流体对流换热系数的实验系统,测量了不同粒子体积份额的水-Cu纳米流体在层流与湍流状态下的管内对流换热系数,实验结果表明,在液体中添加纳米粒子增大了液体的管内对流换热系数,粒子的体积份额是影响纳米流体对流换热系数的因素之一。综合考虑影响纳米流体对流换热的多种因素,提出了计算纳米流体对流换热系数的关联式。

EXPERIMENTAL INVESTIGATION ON CONVECTIVE HEAT TRANSFER OF NANOFLUIDS

An experimental system was built to study convective heat transfer feature of the nanofluid flowing in a tube. The convective heat transfer coefficient of the sample Cu-water nanofluid for the fully developed laminar and turbulent flow inside a tube was measured. The experimental results showed that the suspended nanoparticles remarkably increase heat transfer per-formance of the base fluid and the nanofluid has larger heat transfer coefficient than pure water under the same Reynolds number. The heat transfer feature of the nanofluid increases with the volume fraction of nanoparticles. Considering the factors affecting the convective heat transfer coefficient of the nanofluid, a new convective heat transfer correlation for nanofluid under single-phase flows in tubes was established.