In this paper, experiments were carried out to investigate convective heat transfer characteristics in rectangular microchennels. Rectangular microchannels were made of copper that contained 20 rectangular microchannels in parallel and have hydraulic ...
In this paper, experiments were carried out to investigate convective heat transfer characteristics in rectangular microchennels. Rectangular microchannels were made of copper that contained 20 rectangular microchannels in parallel and have hydraulic diameter of 700 ㎛. Distilled water was used as a working fluid. The experiments were conducted with the Reynolds number ranging from 400 to 800, heat flux range 35 ~ 85 ㎾/㎡ and the inlet fluid temperature of 20℃. The heat transfer coefficient has values in the range of 4.51 ~ 6.45 ㎾/㎡℃. Convective heat transfer coefficient obtained in fully developed region and increased with increasing Reynolds number. Also, thermal entry length increased with increasing Reynolds number in the laminar flow. As a result, the experimental correlation for Nusselt number as a function of Reynolds number and Prantl number was proposed, and it was found that this correlation has ±5% of error range.