圧力駆動される片面加熱矩形流路での対流挙動に関するマイクロPIV計測に基づく考察

抄録

Convective heat transfer is an important process for many industries and products including electronics, automobiles, and production equipment. Especially the demand for improved cooling capacity is increasing due to the miniaturization of electronic device and the increase in heat generation density caused by the higher density of semiconductors. This requires an improvement in heat transport efficiency. The heat transport efficiency is expected to be improved by micro-particles dispersed in cooling liquid. Although the effects of particle concentration and material are frequently reported, further investigation of fluid and particle behavior with established wall temperature conditions is necessary. In this research, a single-sided heated channel with transparent glass wall with electrically conductive film was created, and the velocity distribution in the channel was measured by micro-PIV using a fluorescence microscope at each temperature conditions. When the bottom surface was heated, convection with complex S-shaped velocity distribution was observed in the channel span direction, which increased with temperature rise. Possible causes are discussed including thermophoresis, Rayleigh-Bénard convection, Marangoni convection, and viscosity coefficient change due to temperature.