Mixed Solutal Convection in the Duct Flow Passing Through a Channel with Two Inclined Finite Flat Plate Sources

• Main Authors: Shang-Hua Huang, 黃上華
• Other Authors: 王立文
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/82302832360373590731

碩士 === 元智大學 === 機械工程學系 === 96 === An experimental investigation of mixed solutal convection in the duct flow passing through a channel with two finite flat plate sources. With the mass transport factor on the channel flow, the flow patterns have become more complex. The fluids from the anode or the cathode are denser or less dense so that they do not match the flow patterns in the pure fluid dynamics. Seldom research can be found on this subject. The flow of a CuSO4+H2SO4+H2O solution will be carried in an inclined rectangular channel with an electrochemical system. The shadowgraph technique is used to visualize the flow and to determine the nature and effect of solutal driven secondary flows in the inclined channel with the two finite flat plate sources inside. The ranges of the parameters in the present work are : Ar=1, Sc=1700~2400, Re=50~300, Grm=2.38×105, θ= -15°~15°, ψ= -20°~20°, b/ H =0.2, w/ b = 8. Some results about the mass transfer rate are also clearly found. With increasing the Reynolds number, the corresponding Sherwood number is increasing, for the Sherwood number is directly proportional to the Reynolds number. When the inclined angle θ is maintain steady, both of two copper finite flat plates are inclined, the Sh number which is been found meanwhile would be greater than in horizontal. Moreover, the largest Sh number would be found as ψ1=-20° and ψ2=20°. While the force convection efficiency is fixed, the mass transfer rate is greater as the fluid flows downward.