Abstract
Heat transfer and pressure drop in mini-channels were examined by using water. The cross-section tested was rectangular. The width, height and length of the flow channel were 3 mm, 0.203 mm 〜 0.791 mm and 260 mm including the heating length of 50 mm, respectively. When the flow channel height became shorter than 0.401 mm, the heat transfer coefficient and the pressure drop coefficient of water single phase flow became smaller than those predicted with correlations for the usual size flow channel. The heat transfer coefficient showed dependency on the Reynolds number in the low Reynolds number region. The pressure loss coefficient did not show transition from the laminar flow to the turbulent flow in the high Reynolds number region.
