带侧向出流孔的梯形通道内部换热特性实验

为深入了解带侧向出流通道内部换热特性,采用热色液晶瞬态测量技术对带侧向出流孔的梯形通道内表面换热进行了测量,重点分析侧流孔孔间距、通道进口雷诺数及侧流比对梯形通道内表面换热特性的影响.实验结果表明:侧流孔孔间距的增大使努塞尔数沿整个面的分布趋于均匀;进口雷诺数的增加会明显加强通道内的换热;随着侧流比的增大,通道沿主流方向同一位置处的换热明显减弱,整个通道内表面的平均努塞尔数亦有所下降.

Heat Transfer Investigation of Internal Passage in Trapezoidal Ducts with Ejection Through the Suction Holes

In order to deeply understand the heat transfer mechanism of the channel with side-outflow,a transient measurement technique of using narrow-band thermochromic liquid crystal is employed to determine heat transfer characteristics on the inner surfaces of trapezium channel with ejection through the suction holes.Experimental studies are carried out to investigate inner surface Nusselt numbers under various spaces between holes,Reynolds numbers and suction-holes-flow ratios.The result indicates that the incre...