Investigation on Thermal-hydraulic Performance in a PCHE With Airfoil Fins for Supercritical LNG Near Pseudo-critical Temperature Under Rolling Condition
Investigation on Thermal-hydraulic Performance in a PCHE With Airfoil Fins for Supercritical LNG Near Pseudo-critical Temperature Under Rolling Condition
Thermal and hydraulic performance of supercritical liquefied natural gas(LNG)was numerically studied in a printed circuit heat exchanger(PCHE)with airfoil fins under a rolling condition.Effects of operating pressures and rolling parameters were investigated.The results indicated that the PCHE had better thermal performance but worse hydraulic performance at lower pressure condition.The instantaneous Nusselt numbers and the instantaneous Darcy friction factors presented quasi-sine patterns against time,with a period same as the rolling period.The rolling condition gave larger time-averaged Nusselt numbers and Darcy friction factors,compared with the static condition,and the thermal and hydraulic performance increased with increasing of rolling amplitude and rolling frequency.However,the rolling amplitude had prevailing effect on the performance,in comparison to the rolling frequency.
关键词
印刷电路板式换热器/翼型/流动换热性能/准临界温度/横摇工况/数值模拟
Key words
Printed circuit heat exchanger/Airfoil/Thermal and hydraulic performance/Pseudo-critical temperature/Rolling condition/Numerical simulation
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