场协同及混沌

Field Synergy Theory and Choas

从对流换热的三维能量方程出发,把对流换热方程与三维导热方程进行类比,导出努塞尔数与流场和温度场的局域无因次参数关系式,提出了场协同理论,指出强化换热不仅取决于流体的速度和流体的物性,而且还取决于流场和温度场的协同,从而加深了对对流换热现象的理解。并从唯象理论、数值模拟和实验验证3个方面对场协同理论给予了验证,提出了实际应用的途径。根据湍流的复杂性,把混沌理论引入对传热的研究当中。

Proceeding from the three-dimensional energy equation of heat convection, analogy is processed between the equation of heat convection and the equation of the three-dimensional thermal conduction,relation between Nu and the dimensionless parameter of flow field and tempera- ture field are derived, the principle of field coordination is presented. Indicating heat exchange enhancement not only depends on current velocity and physical property of liquor, but the synergy of flow field and temperature field, having more comprehension to heat convection phenomenon. Also from phenomenological relation,numerical simulation and experimental verification three aspects, the principle of field synergy have been proved,the approaches how to apply it have been put forward. According to complexity of turbulent flow, chaos theory will be introduced to the study to the heat transfer.