Abstract
Flow and temperature fields of forced convective heat transfer over a roughened surface (pin-fin array) heated from below were visualized by using thermo-sensitive liquid crystal. Three different pin pitches in flow direction were examined. In the case of the smallest pitch, the fluid .was stagnant between pins, while in the largest one, the fluid was highly disturbed between pins. The results indicate that the heat transfer between pins was greatly affected by pin pitches.
