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

首席研究人员建议研究波状降膜和液滴中的二元流体吸收。分析和实验技术将被用来解释逆流蒸汽剪切、油膜曲率变化和表面张力梯度引起的毛细压力差以及管间不稳定驱动的液滴模式吸收的影响。薄膜厚度视频和薄膜厚度探头数据的图像处理将用于开发平滑和波状薄膜的随时间变化的轨迹，包括波幅、频率和速度。通过直接测量验证的动量平衡将确定液滴的形成位置、尺寸分布和速度，以及蒸汽剪切对液滴厚度、波型结构和液滴夹带的影响。这项工作将为吸收过程中的流体力学和热质传递提供一致的分析、数值和实验处理。从研究中获得的理解将被用于开发热交换器和质量交换器的小型化技术，并将导致紧凑、模块化的设计，以帮助减少臭氧消耗。

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.