摘要
流体物性随温度变化呈现高变化特性时,密闭空间流体自然对流规律的模拟计算需要采用变物性计算方法。以液态水为研究对象,采用变物性方法研究其在密闭空间内的自然对流现象,分析温度变化时流体流动与传热过程,并采用分子间距变化规律对变温差下的密闭空间满液体理论进行解释。模拟计算结果表明:液体密度、粘度随温度改变较大时,对密闭空间内流体传热过程有较大影响,采用变物性方法可以更准确地模拟密闭空间内自然对流现象,并为热管技术的发展奠定一定的理论基础。
In the case of fluid properties changing with temperature dramatically, it is necessary to utilize the variable property calculation method to simulate natural convection of fluid inside an enclosed space. In this paper , liquid water was used as study object, and its natural convection inside the enclosed space was investigated by means of variable property method. Characteristics of fluid flow and heat transfer under variable temperature were analyzed, and variation of molecular spacing was used to explain the full-liquid theory inside the enclosed space under variable temperature difference. The simulation results indicate that, when density and viscosity of liquid change with temperature dramatically, they have significant effects on the heat transfer of fluid inside the enclosed space. It can be seen that the variable property method can accurately simulate the natural convection inside an enclosed space, and the obtained results will lay a theoretical foundation for develooment of heat pioe.
出处
《辽宁化工》
CAS
2010年第12期1297-1301,共5页
Liaoning Chemical Industry
关键词
自然对流
数值模拟
变物性
Natural convection
Numerical simulation
Variable property
