Mass Transfer and Transport Processes in Two-Phase Flow

该计划概述继续成功早期NSF 支持两相流输运过程的研究。 总的目标是了解如何动荡 分子物质的输运与拉格朗日函数有关 统计学，以了解湍流运输的 密度不同的颗粒、液滴和气泡 从它们悬浮的液体中， 在固体/液体或 气液边界与流体力学因素有关 接近界面，了解非线性波 由空气流过液体表面引起的。 提出了五个项目：（1）计算机研究， 湍流的拉格朗日和欧拉描述 运输，并提供关于 减少湍流输运中的分子扩散系数;（2） 液滴、颗粒湍流输运的光学研究 （3）波浪对气体吸收的影响 分层流;（4）气液两相流中的有限振幅波 分层流动;（5）固体颗粒的湍流传质; 液体边界 这项工作的重要方面是， 将进行超级计算机实验， 发展的光学技术将用于研究拉格朗日 颗粒、液滴和气泡的湍流特性， 最后，最直接的后果之一是， 从这项研究将是应用导致发展 气液两相流管道设计方程的改进。 所选用的气体吸收体系具有一定的实用性 在许多过程问题中的重要性。 然而，它也是 由于跨区域的转移， 环境沃茨的表面是 地球物理和自然的生物化学循环 物质. 这就解释了人们对它的广泛兴趣， 化学家、化学家、土木工程师、机械工程师 工程师和环保主义者

The program outlined continues successful earlier NSF supported research in transport process in two phase flow. The general objectives are to understand how turbulent transport of molecular species is related to Lagrangian statistics, to understand the turbulent transport of particles, droplets and bubbles that have a density different from the fluid in which they are suspended, to understand how the turbulent transport of mass at a solid/liquid or a gas/liquid boundary is related to fluid mechanical factors close to the interface, and to understand non-linear waves caused by air flow over a liquid surface. Five projects are proposed: (1) Computer studies that relate the Lagrangian and Eulerian descriptions of turbulent transport, and that provide information on the role of molecular diffusivity in diminishing turbulent transport; (2) Optical studies on the turbulent transport of drops, particles and bubbles; (3) Influence of waves on gas absorption in stratified flows; (4) Finite amplitude waves in gas-liquid stratified flows; (5) Turbulent mass transfer at a solid- liquid boundary. Important aspects of this work are that combined laboratory and supercomputer experiments will be conducted and that newly developed optical techniques will be used to study Lagrangian turbulence characteristics of particles, drops and bubbles and finally, one of the most immediate consequences to be derived from this study will be the application leading to development of improved design equations for gas/liquid flow in pipelines. The system chosen to study gas absorption is of practical importance in many process problems. However, it is also of interest to geophysicists, since the transfer across the surface of environmental waters is an important phase of the geophysical and natural biochemical cycles of numerous substances. This explains the widespread interest in it by chemists, geophysicists, civil engineers, mechanical engineers, and environmentalists.