Mixed Convection in Three Dimensional Separated Flow

主要研究者提出了一个协调的实验和数值研究的流动和传热的分离和再附着的流动区域中的三维几何形状的后向步骤。 将使用激光多普勒测速仪测量局部速度分量，同时使用液晶热成像法测量传热系数。 重点将是确定的平均和波动的速度分量上的热传递和浮力的效果。 将确定雷诺剪应力、法向应力和传热系数。后向台阶将用于流动构型，因为它包含了在三维分离流区遇到的大多数复杂情况：自由剪切层;强逆压梯度;剪切层和壁面的相互作用;以及再附着。

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.