Development of a surface shape for the heat transfer enhancement and

6th International Symposium on Turbulence and Shear Flow Phenomena

reduction of pressure loss in an internal cooling passage ; Hyun Sik Yoon ; Man Yeong Ha

PID  :  127713

来源: CEUR

【 摘 要 】

A new surface shape of an internal cooling passagewhich largely reduces the pressure drop and enhances thesurface heat transfer is proposed in the present study. TheRibletmounted Dimple as the new surface shape isconsisted of the concave dimple and the riblet which isprotruded along the streamwise direction. Direct numericalsimulations were conducted in order to simulate the fullydeveloped turbulent flow and thermal fields through thecooling passage at the Reynolds number of 2,800 based onthe mean bulk velocity and channel height and Prandtlnumber of 0.71 (air). The mean pressure gradient iscalculated in order to keep the mass flow rate constant in thestreamwise direction. The thermoaerodynamic performancefor five different cases considered in the present study wasassessed in terms of the Nusselt number, Stanton number,Fanning friction factor, volume goodness factor and areagoodness factor. At the riblet angle of 60among the ribletangles considered in this study, the drag reduced about and Nusselt number augmented about .