隔板对流系统的温度漂移现象及其分布特性

Phenomenon of temperature drift and distribution characteristics of partitioned convection system

该文通过计算研究隔板对流系统中传热通道的温度分布特性。由于隔板对流系统流动对称破缺使得狭缝流动相向而行,带动温度边界层中包含温度的流动流入,形成了传热通道中的温度漂移现象。传热通道中平均温度沿纵向分布分四个区域,其中出现温度逆分布异常区。通过研究发现温度分布异常区是由该区域存在羽流喷流造成的。羽流喷流具有较强的浮力,在热通道中带动喷流加速向上输运热量,使得平均温度随高度变化不降反而增加。冷通道反之亦然。几何参数狭缝高度d影响传热通道中的温度漂移特性和整个系统的传热效率,传热通道宽度b不影响通道中的温度漂移量和单个通道的传热效率,但其变化会改变通道个数进而影响整体传热效率。

The temperature distribution characteristics of the heat transfer channels in the partitioned convection system are studied by Numerical simulation.Because of the symmetry breaking of the flow in the convection system,the flows in the gaps move in opposite direction,which drives the flow of temperature in the temperature boundary layer and forms the phenomenon of temperature drift in the heat transfer channel.The distribution of mean temperature in the heat transfer channel are divided into four regions,the anomalous distribution of temperature is found.It is found that the phenomenon is caused by injection of plume in this area.The injection of plume is caused by a strong buoyancy,which drives the jet to accelerate the upward heat transfer in the hot channel,so that the average temperature does not decrease but increases with the height.Cold channels are the same conversely.The height of gaps d affects the characteristics of temperature drift in the heat transfer channels and the heat transfer efficiency of the whole system.The width b of the heat transfer channels does not affect the temperature drift in the channel and the heat transfer efficiency of the single channel,but its change will chan ge the number of channels and affect the overall heat transfer efficiency.