The heat transfer performance of steam and air flow in a rough rectangular channel with different inverted V-shaped ribs was investigated by infrared thermal imaging technology. Under the conditions that the Reynolds number is in the range of 4000–15,000, the effects of the rib angle on the heat transfer enhancement of the two coolants were obtained. The rib pitch ratio of the flow channel is 10, the ratio of the rib height to the channel hydraulic diameter is 0.078, and the inverted V-shaped rib angle varies from 45° to 90°. The results show that in the inverted V-shaped ribbed channel, the Nu number on both sides of the channel is greatly increased, while the Nu number in the middle of the channel is lower. The local Nu distribution on the surface of the ribbed channel is highly related to the shape of the rib. For different medium cooling, the value and unevenness of the heat transfer coefficient are different, but the shape of the high and low heat transfer coefficient distribution is hardly affected. The heat transfer of both coolants increases as the rib angle decreases from 90° to 45°. Compared with air flow, steam flow cooling shows higher convective heat transfer enhancement. For rib angles of 45°, 60°, 75°, and 90°, under the operating condition of the Reynolds number = 12,000, the area-averaged Nusselt numbers of the steam flow is 23.6%, 27.4% and 13.9% higher than that of the air flow, respectively. Based on the experimental heat transfer data, the correlation in terms of the Reynolds number and the rib angle was developed, which is used to estimate the Nu number for steam and air cooling in the inverted V-shaped rib-roughness channels.

利用红外热成像技术研究了蒸汽和空气在具有不同倒V形肋的矩形矩形通道中的传热性能。在雷诺数为4000-15,000的条件下，获得了肋角对两种冷却剂传热增强的影响。流道的肋节距比为10，肋高与流道水力直径的比为0.078，倒V形肋角在45°至90°之间变化。结果表明，在倒V字形肋状槽中，槽两侧的Nu值大大增加，而槽中部的Nu值则较低。当地的怒族带肋通道表面上的分布与肋的形状高度相关。对于不同的介质冷却，传热系数的值和不均匀性都不同，但是高低传热系数分布的形状几乎不受影响。当肋角从90°减小到45°时，两种冷却剂的热传递都增加。与气流相比，蒸汽流冷却显示出更高的对流传热增强。对于45°，60°，75°和90°的肋角，在雷诺数= 12,000的工作条件下，蒸汽流的面积平均努塞尔数比该数值高23.6％，27.4％和13.9％分别的空气流量。根据实验传热数据，建立了雷诺数与肋角之间的相关性，NU数为蒸汽和空气在倒V形肋粗糙度通道冷却。