测量了25个直径为0.81mm、长度为0.5m的挤出微通道管中CO2流动汽化的传热系数和压降。通过水套对试验段进行加热，并使用回归方法根据测量的总传热系数推导出内部传热系数。使用0.98 mm的加热玻璃管和高速数码相机，在单独的试验台上观察两相流模式。高质量流量下以卷吸为主的波浪形环形流。流型观测不符合广义地图。在0°C至25°C的温度、190至570 kgm的质量流量下，在不同的平均蒸汽分数下进行传热测量- 2s-1，热通量为10和20 kWm-2。传热结果表明，干燥对传热有显著影响，尤其是在高质量流量和高温下。在干燥之前，核沸腾占主导地位。使用针对垂直流开发的现有模型，摩擦压降数据与16%的平均偏差相关。传热数据与核沸腾、对流蒸发、干燥初期和干燥后传热的组合模型相关联。单位:SICitation:Symposium，ASHRAE交易，第109卷，pt。1.

The heat-transfer coefficient and pressure drop were measured for flow vaporization of CO2 in an extruded microchannel tube with 25 channels that were 0.81 mm in diameter and 0.5 m in length. The test section was heated by a water jacket, and a regression method was used to derive the internal heat-transfer coefficient based on the measured overall heat-transfer coefficient. Two-phase flow patterns were visualized in a separate test rig, using a 0.98 mm heated glass tube and a high-speed digital camera. Wavy annular flow with entrainment dominated at high mass flux. Flow pattern observations did not fit generalized maps. Heat-transfer measurements were conducted at varying mean vapor fractions at temperatures of 0°C to 25°C, mass flux of 190 to 570 kgm-2s-1, and heat flux of 10 and 20 kWm-2. Heat-transfer results show significant influence of dryout, particularly at high mass flux and high temperature. Nucleate boiling dominates prior to dryout. Frictional pressure drop data were correlated with a mean deviation of 16% using an existing model developed for vertical flow. Heat transfer data were correlated with a combination of models for nucleate boiling, convective evaporation, dryout incipience, and post-dryout heat transfer.Units: SI