Abstract: An experimental rig was constructed for study of non-boiling cooling heat transfer of gas-liquid 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 interfacial 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.

Key words: slug flow, two-phase flow, convective heat transfer, non-boiling