A model of stratified entrainment using vortex persistence |
| |
Authors: | Aline J Cotel and Robert E Breidenthal |
| |
Institution: | (1) Department of Aeronautics and Astronautics, University of Washington, Box 352400, 98195-2400 Seattle, WA, U.S.A. |
| |
Abstract: | A new model is proposed for the entrainment rate by vortices across stratified interfaces. In the model, different entrainment
regimes are distinguished by the conventional parameters Richardson, Reynolds, and Schmidt number as well as a new parameter,
the “vortex persistence”. Vortex persistence is defined as the number of rotations a vortex makes during the time it moves
its own diameter with respect to the interface. It is further proposed that the concept of vortex persistence is important
whenever a vortex is near any kind of surface, either stratified or solid. The model is in accord with most field and laboratory
observations in a variety of stratified and bounded flows, including measurements of wall heat transfer and vortex formation
in starting jets. |
| |
Keywords: | vortex dynamics stratified entrainment heat transfer turbulence boundary layer |
本文献已被 SpringerLink 等数据库收录! |
|