采用扩展温度振荡法测量超临界CO_2管内对流换热特性

The Measurement of Convection Heat Transfer Characteristics in a Supercritical Carbon-Dioxide Gas Tube by the Use of an Extended Temperature Oscillation Method

提出了考虑小通道内流体温度变化时测量管内对流换热系数的扩展温度振荡法模型 ,该法可用于测量各种光滑表面通道内流动的局部对流换热系数。实测了典型压力温度条件下 2mm内径不锈钢圆管内超临界CO2 对流换热系数。

Presented is an extended temperature oscillation model for the measurement of in-tube convection heat-transfer factor during the variation of fluid temperature in a small duct. The recommended method can be employed to measure the local convection heat-transfer factor of flows in various kinds of smooth-surface duct. An actual measurement was conducted of the supercritical CO2 convection heat-transfer factor in a round stainless steel tube of 2 mm inner diameter under typical pressure and temperature conditions.