Development of Advanced Microchannel Heat Exchanger

(4)Heat transfer and pressure drop correlations for microchannel recuperators with conventional zigzag channels and new S-shape fins

抄録

A microchannel heat exchanger (MCHE) is considered as a promising candidate for recuperators of gas turbine reactors. A conventional MCHE with zigzag fluid channels possesses high heat transfer performance. However eddies and swirling flows around bend corners result in high pressure drop. A new MCHE with S-shape fins, based on a sine curve, was proposed in the previous study. The pressure drop is estimated by 3-D CFD simulations to be several times less reference　to the conventional MCHE with zigzag fluid channels maintaining almost the same heat transfer performance. This study has been done to confirm the simulation results through mockup experiments for the recuperators of the gas turbine reactors and to propose empirical correlations of Nusselt number, Nu, and the pressure drop factor, f, for both the MCHEs with zigzag fluid channels and S-shape fins.