Effects of velocity fluctuations on heat transfer enhancement
學年 91
學期 2
出版（發表）日期 2003-05-01
作品名稱 Effects of velocity fluctuations on heat transfer enhancement
作品名稱（其他語言）
著者 Chen, Tseng-Yuan; Du, R. K.
單位 淡江大學航空太空工程學系
出版者 Heidelberg: Springer
著錄名稱、卷期、頁數 Experiments in Fluids 34(5), pp.548-555
摘要 The three-dimensional velocity fluctuation effects on heat transfer enhancement were experimentally investigated using a wind tunnel system and cylinders placed upstream of the test section in the wind tunnel. The cylinders with different diameters were used as turbulators to generate vortical flow motions with three-dimensional velocity fluctuations. A heated plate, part of the tunnel wall, was placed far downstream of the cylinders such that it was subjected mainly to flows with velocity fluctuations but with negligible steady vortical motions. These studies included three-component velocity measurements to characterize the near-wall and cross-section velocity fields and to obtain the turbulent kinetic energy. The temperatures were measured by thermocouples on the heated plate to obtain the convection heat transfer coefficients and the Nusselt numbers. Results indicate that the heat transfer was enhanced by the velocity fluctuations, which is attributed to the modification of boundary layer velocity profiles without the modification of boundary layer thickness. The resulting normalized Nusselt number was approximately a parabolic function of a dimensionless parameter, the product of Reynolds number and normalized turbulent kinetic energy.
關鍵字 Approximation theory; Boundary layers; Heat convection; Heat transfer coefficients; Kinetic energy; Nusselt number; Temperature measurement; Thermocouples; Three dimensional; Velocity measurement; Vortex flow; Wind tunnels; Heat transfer enhancement; Turbulators; Velocity fluctuations; Heat transfer; heat transfer; mathematical analysis; Nusselt number; velocity; wind tunnel
語言 en
ISSN 0723-4864
期刊性質 國外
收錄於
產學合作
通訊作者 Chen, T.Y.
審稿制度
國別 DEU
公開徵稿
出版型式 紙本
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