Endwall effect on the mass transfer in a square open cavity
Journal
International Communications in Heat and Mass Transfer
Journal Volume
26
Journal Issue
2
Pages
165-176
Date Issued
1999
Author(s)
Abstract
In a lid-driven flow over a square open cavity with confined endwalls, a naphthalene sublimation technique was employed to measure the local mass transfer rates over the bottom surface of the cavity for the Reynolds numbers ranging from 2,000 to 4,000. The tested cavity has a span-to-width ratio (SAR) of 8 and a width-to-depth ratio (AR) of 1. The measured results are compared with predictions based on a deterministic vortex method with the assumption of two-dimensional cavity flow. The numerical results indicate an increase in mass transfer rate on the bottom surface of the cavity with an increase in the Reynolds number. The experimental results show the similar trend in the mass transfer rate with the presence of endwalls. In addition, a large variation in the spanwise direction of the measured local mass transfer rates implies the existence of Taylor - Gortler - like (TGL) vortices in the cavity. Furthermore, a correlation is derived between the measured overall averaged Sherwood number and the Reynolds number. In a lid-driven flow over a square open cavity with confined endwalls, a naphthalene sublimation technique was employed to measure the local mass transfer rates over the bottom surface of the cavity for the Reynolds numbers ranging from 2,000 to 4,000. The tested cavity has a span-to-width ratio (SAR) of 8 and a width-to-depth ratio (AR) of 1. The measured results are compared with predictions based on a deterministic vortex method with the assumption of two-dimensional cavity flow. The numerical results indicate an increase in mass transfer rate on the bottom surface of the cavity with an increase in the Reynolds number. The experimental results show the similar trend in the mass transfer rate with the presence of endwalls. In addition, a large variation in the spanwise direction of the measured local mass transfer rates implies the existence of Taylor-Gortler-like (TGL) vortices in the cavity. Furthermore, a correlation is derived between the measured overall averaged Sherwood number and the Reynolds number.
Type
journal article