A Study of a Thin Plate Reciprocated Moving on a Heat Surface in a Duct

• Main Authors: Yu-Shu Chen, 陳又旭
• Other Authors: Wu-Shung Fu
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/19814454337289575699

碩士 === 國立交通大學 === 機械工程系所 === 96 === The study investigated the heat transfer enhancement by a reciprocated moving plate on the heat surface inside a duct. The characteristics of the flow and thermal fields are analyzed numerically. In the numerical analysis, taking density based method in to consideration, also adding preconditioning method in equations. All finite difference methods are explicit method. Observing the mechanisms of the heat transfer rate then discussing how the different plate moving speed effect the heat transfer rate. The numerical result shows that the motion of the plate destroys the boundary layer on the heat surface before the moving plate, and the boundary layer reforms behind the moving plate immediately. The boundary layer reformation and cold fluid induced by the moving plate flowing toward the heat surface are the major heat transfer enhancement mechanisms. Besides when the plate moves faster, the boundary layer reforms frequently. As a result, the heat transfer enhancement becomes huge.