CAREER: Binary-Fluid Absorption Heat and Mass Transfer In Wavy Films and Droplets

主要研究者建议研究波浪形降膜和液滴中的二元流体吸收。 分析和实验技术将被用来占逆流蒸汽剪切，毛细管压力差，由于膜曲率变化和表面张力梯度，和不稳定驱动液滴模式吸收管之间的影响。 膜厚视频和膜厚探头数据的图像处理将用于开发光滑和波浪膜的时间依赖性轨迹，包括波的振幅、频率和速度。 液滴形成的位置，尺寸分布和速度，以及蒸汽剪切对厚度，波结构和液滴夹带的影响将通过直接测量验证的动量平衡来确定。这项工作将提供一个一致的分析，数值和实验处理的流体力学和吸收中的热量和质量传递。 从研究中获得的理解将用于开发热质交换器的小型化技术，并将导致紧凑的模块化设计，以帮助减轻臭氧消耗。

The principal investigator proposes to study the binary fluid absorption in wavy falling films and droplets. Analytical and experimental techniques will be used to account for the effects of countercurrent vapor shear, capillary pressure differences due to film curvature variations and surface tension gradients, and instability driven droplet-mode absorption between tubes. Image processing of film thickness video and film thickness probe data will be used to develop time-dependent traces of smooth and wavy films, including wave amplitude, frequency, and celerity. Droplet formation sites, size distributions and velocities, and the effect of vapor shear on thickness, wave structure, and droplet entrainment will be determined from momentum balances validated by direct measurements.The work will provide a consistent analytical, numerical and experiment treatment of the hydrodynamics and heat and mass transfer in absorption. The understanding gained from the research will be used to develop a miniaturization technology for heat and mass exchangers and will result in compact, modular designs to help mitigate ozone-depletion.