Presidential Young Investigator Award: (1) Combined Con- vection from a Rotating Cylinder 2) Double Diffusion in a Fluid Layer Superposing a Porous Layer

本研究主要集中在两个方面，第一， 旋转水平圆柱体的自由强迫对流。 研究 是实验性的，并且通过使用空气作为工作流体来进行 和现有的风洞来模拟强制对流。 圆筒是电加热的， 条件保持在圆柱体边界上。 成果文件 彻底的雷诺数，瑞利数的影响， 圆柱的角速度对温度和流量的影响 领域的 研究的第二个领域涉及对流不稳定， 叠加的多孔层和流体层由以下因素的联合作用触发： 垂直方向的温度和浓度梯度。 在 理论研究，系统的临界参数 产生对流运动的确定，以及性质， 这些动议。 理论研究结果进行了测试， 实验测量。

The research focuses on two areas, the first dealing with combined free-forced convection from a rotating horizontal cylinder. The study is experimental and is carried out by using air as the working fluid and an existing wind tunnel to simulate the forced convection flow. The cylinder is heated electrically and the constant heat flux condition is maintained on the cylinder boundary. The results document thoroughly the effect of the Reynolds number, the Rayleigh number, and the angular velocity of the cylinder on the temperature and flow fields. The second area of research concerns convective instability in superposed porous and fluid layers triggered by the combined action of temperature and concentration gradients in the vertical directions. In the theoretical investigation, the critical parameters of the system which yield convective motions are determined, as well as the nature of these motions. The theoretical findings are tested against experimental measurements.