Natural convection between vertical parallel plates with asymmetric heating at high aspect ratios

• Main Authors: Peng, Tzu-En, 彭梓恩
• Other Authors: Fu, Wu-Shung
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/41190288628204544018

碩士 === 國立交通大學 === 機械工程系所 === 103 === An unsteady flow reversal of natural convection in vertical parallel plates with an asymmetrically heated wall is investigated numerically. For clarifying the occurrence of flow reversal, the width of the plates is regarded as a variable, and the non-reflecting boundary condition is adopted at apertures. The methods of the Roe scheme, preconditioning and dual time stepping matching LUSGS are simultaneously used to solve governing equations which are available for a low speed compressible flow problem. The flow reversal is observed under broad width situations and absent under narrow width situations. Distributions of the pressure differences at the apertures are revealed to indicate the occurrence of flow reversal. As the width of the parallel increases, the flow reversal will form the flow downward-penetration through the inlet. The present Nusselt numbers, which mean time and area-averaged ones, display relatively good agreement with those of the existing works.