空气-水段塞流冷却传热与相界面分布实验研究

Experimental study on heat transfer and interfacial distribution of air-water slug flow in cooling process

针对海底油气管道的散热问题搭建水平气液两相段塞流换热实验装置。研究冷却液温度4℃条件下无相变冷却过程段塞流的换热特性。实验中采用双平行电导探针、热电偶、热电堆等多种测量手段对冷却条件下段塞流的流动和传热参数进行测量。给出对流换热系数与流动界面分布参数变化规律,表明管道上下壁面由于传热不均存在显著的温差。结果还表明,段塞流对流换热系数受气相表观流速影响较小,流体与下壁面之间的对流换热明显强于与上壁面之间的对流换热。

An experimental rig was constructed for study of non-boiling cooling heat transfer of gasliquid flow in subsea pipeline in oil and gas industry. The hydrodynamic and heat transfer characteristics of slug flow with 4 ℃ coolant in the annular pipe were measured by using sensors such as thermocouples, thermopiles, parallel conducting probes, etc. The convective heat transfer coefficients and flow parameters were obtained and a clear temperature difference was measured between the top and the bottom of the pipe. The effects of interracial distribution of liquid slug and elongated bubble on the heat transfer coefficient were analyzed. The experimental results showed that the convective heat transfer coefficient was slightly affected by superficial gas velocity. The convective heat transfer between the fluid and the lower wall was significantly stronger than that between the fluid and the upper wall.