超临界工况下水在换热表面传热特性研究进展

Research Progress on the Heat Transfer Characteristics of Water on Heat Exchange Surface Under Supercritical Conditions

对于超临界水传热特性的研究,自21世纪初以来呈快速增长的态势发展.该文总结了近年来国内外学者对于超临界水换热性能的研究,系统分析了浮升力、壁面热流密度、质量流速、压力等因素对其流动换热特性的影响.众多结果表明:浮升效应引起的剪切应力和径向流速的变化会导致传热恶化;通过减小热流密度,提高质量流速能有效改善传热.目前研究中给出了超临界水一般传热关系式,但其适用精度还需进一步提升.

The research on the heat transfer characteristics of supercritical water has been developing rapidly since the beginning of the 21st century.This article summarizes the research on the heat transfer performance of supercritical water by domestic and foreign scholars in recent years,and systematically analyzes the effects of factors such as buoyancy,wall heat flux density,mass flow rate,and pressure on its flow and heat transfer characteristics.Numerous results indicate that changes in shear stress and radial flow velocity caused by buoyancy effects can lead to deterioration of heat transfer.Reducing heat flux density and increasing mass flow velocity can effectively improve heat transfer.At present,a general heat transfer equation for supercritical water has been proposed in research,but its applicability accuracy still needs to be further improved.