Mixed Convection in Three Dimensional Separated Flow

作者提出了一种基于后向台阶三维几何结构的分离流区和再附着流区的流动和传热的实验与数值协调研究方法。用激光多普勒测速仪测量局部速度分量，同时用液晶热像仪测量传热系数。重点将是确定传热和浮力对平均和波动速度分量的影响。雷诺兹剪应力，正应力和传热系数将被确定。后面向阶跃将用于流动配置，因为它包含了在三维分离流动区域中遇到的大多数复杂性：自由剪切层；逆压梯度强；剪力层与墙体的相互作用；和回贴。

The principal investigator proposes a coordinated experimental and numerical study of the flow and heat transfer in the separated and reattached flow regions in the three dimensional geometry of a backward facing step. A laser-Doppler velocimeter will be used to measure the local velocity components simultaneously with the measurement of the heat transfer coefficient using liquid crystal thermography. The focus will be on determining the effect of the heat transfer and the buoyancy on the mean and fluctuating velocity components. Reynolds shear stresses, normal stresses, and heat transfer coefficients will be determined.The backward facing step will be used for the flow configuration since it contains most of the complexities that are encountered in three dimensional separated flow regions: a free shear layer; strong adverse pressure gradient; interaction of the shear layer and the wall; and reattachment.