Experimental Study on the Convection Heat Transfer from a Transversely Oscillating Circular Cylinder

• Main Authors: Horng-Nan Chen, 陳鴻南
• Other Authors: Chin-Hsiang Cheng
• Format: Others
• Language: en_US
• Published: 1993
• Online Access: http://ndltd.ncl.edu.tw/handle/55197257184235515181

碩士 === 大同工學院 === 機械工程研究所 === 81 === The present study is concerned with heat transfer enhancement in forced convection air flow over a transversely oscillating circular cylinder.The effect of oscillation of the cylinder on heat transfer coefficient and flow pattern is evaluated by experimental measurement. A modified transient test method is employed to determine the heat transfer coefficient for various combinations of dimensionless oscillation frequency Sc, dimensionless oscillation amplitude (A/D), and Reynolds number. The ranges of these parameters considered in this study are : 0.ltorsim.Sc.ltorsim.0.3 ,0.ltorsim.A/D.ltorsim.0.628 , and 0.ltorsim.Re.ltorsim.4000. Results show that the heat transfer coefficient can be significantly influenced by the oscillation of cylinder. Basically, two mechanisms that enhance the heat transfer are found, namely the lock-on effect and the turbulence effect.