마이크로채널 벽면에서의 나노입자 거동에 의한 나노유체의 대류열전달 향상에 대한 수치해석

초록

The heat transfer performance of nanofluids was numerically investigated in a laminar flow regime of aqueous TiO2-water nanofluids inside a PDMS (Poly Di-Methyl Siloxane) microchannel with a rectangular cross-section under constant wall temperature boundary conditions. In this study, to explore the effect of nanoparticles migration on enhanced heat transfer by nanofluids, the numerical scheme for particle tracking (i.e., DPM: Discrete Phase Model) in two-phase flow modeling was additionally considered based on conventional CFD (Computational Fluid Dynamics) and HT (Heat Transfer) analysis. The simulation results were compared with experimental measurements to assess the accuracy of the numerical model. It was observed that the thermal performance of the nanofluids is better than that of DIW for all flow rate conditions because of particles-wall interactions on the heated surface of the microchannel. The effects of experimental parameters such as the flow rates, wall temperatures and particle concentrations on the thermal performance of nanofluids were also discussed.