层板结构内部换热特性的研究

 在已研究流阻特性的基础上,通过改变扰流柱柱高、柱形,对两种类型结构的层板进行内表面换热系数的测量、分析。层板内表面上的换热系数随冲击距离的减小而增大,随冲击孔间距的增大而减小。方形扰流柱的换热情况要稍好于菱形扰流柱、圆形扰流柱,并且柱子高低对流场影响很大,尤其是C 型绕流方案。基于换热体积和换热面积之比特性尺寸的努谢特数与冲击雷诺数之间成对数线性关系,并整理出准则关系。

Investigation of the Internal Heat Transfer Characteristics of Lamilloy

Two typical internal flow patterns are chosen to carry out the internal heat transfer experiments based onthe fronter fluid flow characteristics. By changing the height and type of the pin-fins, the internal heat transfer onthe boards can be learned. The heat transfer coefficients decrease when increasing jet spacing and the distance fromthe jet to the target . The square shaped pin fins produce the highest internal heat transfer, followed by diamond andcircular pins. The variation of the height of the channel has effects on the fluid flow, and shows different heat transfer coefficient distributions. The Nusselt number based on the length scale of the ratio internal volume to heat transfer surface increases with the impingement Reynolds number. Nusselt number is shown to be linear on a log-log scalewith Reynolds number.