Numerical study for heat transfer and pressure drop of supercritical carbon dioxide fluid with a channel bending angle in printed circuit heat exchanger

Three dimensional numerical analysis is performed to study heat transfer and pressure drop of supercritical carbon dioxide flow in printed circuit heat exchanger. Numerical analysis for zigzag channel type Printed Circuit Heat Exchanger is performed and compared with previous experimental data. Maximum deviation of in-outlet temperature difference and pressure drop from experimental data is about 10% and three dimensional numerical analysis model is validated. From the results of numerical analysis, channel bending angle is selected as key parameter for heat transfer and pressure drop characteristics. Three dimensional numerical analysis is performed with channel bending angles of 80 .deg., 100 .deg., 120 .deg., 180 .deg.. The results show that decreasing channel bending angle, total heat transfer rate of heat exchanger increases and the pressure drop of channel in-outlet increases. The channel bending angle influenced on heat transfer area and flow configuration like local flow velocity, flow separation near the channel bending point. As these results, the channel bending angle had an effect on heat transfer and pressure drop of heat exchanger