旋转圆盘周向表面对流换热萘升华比拟研究

Analogy Study on Convection Heat Transfer on the Circumferential Surface of Rotating Disc with Naphthalene Sublimation

运用热-质比拟原理和萘升华技术,研究旋转圆盘周向表面对流换热特性,得到了转速在200～1 200r.min-1之间,圆盘自转过程与耦合过程(耦合过程是指即有圆盘的转动又有风吹的影响)光滑表面、纵向表面和块状表面局部对流换热系数,给出了3种表面结构下对流换热系数与圆盘转速的关系。通过对比发现,旋转圆盘光滑表面结构具有较好的散热性能,纵向表面结构次之,块状表面结构的散热性能较差。

Convection heat transfer on the circumferential surface of rotating disc was experimentally investigated by using heat-mass transfer analogy principle and naphthalene sublimation technology. At the condition of the disc rotating or the coupling influence of the disc rotating speed and air velocity, the local heat transfer coefficients of the smooth, vertical, and block surfaces were measured when the rotational speed ranges from 200 r · min^-1 to 1 200 r· min^-1 The relationships between the speed and the heat transfer coefficient of the three different surface structures were obtained. Meanwhile, the influences of these three structures on the heat dissipation performance of rotating disc circumferential surface were also compared. The results show that the rotating disc with smooth surface structure has good dissipation performance, followed by the vertical surface structure, the block surface structure is poor.