E141 ガス-ガスマイクロチャンネル熱交換器に対する対数平均温度差法の適用性(熱伝達I)

抄録

Heat transfer characteristics of a gas-to-gas parallel-flow microchannel heat exchanger has been experimentally investigated. The microchannel has a rectangular cross section with 200 μm high and 300 μm wide. Working fluid used was air. Reynolds number ranged from 63.5 to 191. The inlets and outlets temperatures of the heat exchanger were measured to obtain heat transfer rate. Experimental heat transfer rates were compared with those predicted by a conventional log-mean temperature difference method. The log-mean temperature difference method can be employed to a parallel-flow configuration whereas that cannot be employed to a counter-flow configuration investigated in our earlier work.