狭隘流路における単相流動摩擦損失に関する研究

抄録

In this study, pressure drop experiments for single-phase flow were carried out using rectangular microchannels with high aspect ratio. The results showed although the friction factor of the test section with De>0.3 mm could be estimated well by the correlations developed for the microchannels with a larger equivalent diameter that De>0.5 mm, the experimental friction factor of the test sections with De<0.3mm was much higher than that of the test section with a larger equivalent diameter that De>0.3 mm, and the conventional correlations for the friction factor was not applicable to the channel whose De<0.3mm. To interpret the experimental results, we focused on the effect of channel roughness. In the laminar flow region, by incorporating the roughness viscosity in addition to the conventional viscosity of the liquid, we found the pressure drop could be evaluated from the theoretical equation for infinite plate laminar flow. While in the turbulent region, the traditional correlation that considering the roughness effect (Colebrook–White equation), after being coupled with the factor that considering the aspect ratio in the rectangular channel, was found still insufficient to predict the data accurately.