Abstract: The recent development of flow and heat transfer research of CO2 hydrate slurry was reviewed as a secondary refrigerant. In the aspect of flow research, five flow patterns(Newtonian flow, Pseudo-plastic flow, Dilatant flow, Bingham plastic flow and Herschel-Bulkley flow) were introduced. It shows that CO2 hydrate slurry is a kind of non-Newtonian liquid with small apparent viscosity indicating excellent flow properties. With regard to heat transfer aspect, the calculation method of hydrate slurry overall heat transfer coefficient in the plate heat exchanger was presented, and CO2 hydrate slurry has excellent heat transfer properties with a convective heat transfer coefficient of 3658W/(m2?K). Moreover, heat transfer properties can be affected by crystal diameter and distribution, flow velocity, solid content and tube dimensions. In conclusion, CO2 hydrate slurry has good prospects in air conditioning application with good flow and heat transfer properties. Finally, the future research priorities on CO2 hydrate slurry were discussed and summarized.

Key words: carbon dioxide, hydrate slurry, multiphase flow, secondary refrigerant, flow, heat transfer

摘要： 综述了国内外在CO2水合物浆的流动和传热特性方面的最新研究进展。在流动特性部分，介绍了流体的五大类型（牛顿流体、假塑性流体、膨胀性流体、宾翰流体和赫-巴流体）以及CO2水合物浆的表观黏度计算公式，研究表明CO2水合物浆是非牛顿流体，表观黏度较小，因而具有优秀的流动性能；在传热特性部分，介绍了水合物浆在板式换热器中的总体换热系数计算方法，研究表明CO2水合物浆的对流换热系数高达3658 W/(m2?K)，因此有优秀的传热性能，而且传热性能会受到晶体直径和分布规律、流速、固体含量和管道尺寸等因素的影响。综上所述，CO2水合物浆具有良好的流动和传热特性，在空调领域有着广阔的应用前景。最后简要展望了今后的研究重点。

关键词: 二氧化碳, 水合物浆, 多相流, 空调载冷剂, 流动, 传热