The role of geometry in rough wall turbulent mass transfer |
| |
Authors: | Kaveh Sookhak Lari Maarten van Reeuwijk Čedo Maksimović |
| |
Institution: | 1. Department of Civil and Environmental Engineering, Imperial College London, London, SW7 2AZ, UK 2. Centre for Environmental Risk Assessment and Remediation, University of South Australia, SA, 5095, Australia 3. Land and Water Research Division, CSIRO, WA, 6014, Australia
|
| |
Abstract: | We report on RANS simulations of high Schmidt number turbulent mass transfer due to a first-order reaction on the surface of a d-type rough wall. We find that for low reaction coefficients, the additional surface area of the rough wall causes an increased mass transfer in comparison with a smooth wall. However, when the reaction coefficient is high, the mass transfer becomes lower than for a smooth wall. A detailed analysis shows that the mass transport in the cavity is dominated by diffusion which becomes the limiting factor at high reaction coefficients. A conceptual model, which is in good agreement with the simulations, highlights that the influence of geometry roughness is not confined to the roughness Reynolds number for molecular-diffusion-dominated cavities. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|