Effect of jet-mainstream velocity ratio on flow characteristics and heat transfer enhancement of jet on flat plate flow

2nd International Conference on Computational Fluid Dynamics in Research and Industry

力学;计算机科学;工业技术

Puzu, N.^1 ; Prasertsan, S.^1 ; Nuntadusit, C.^1

Department of Mechanical Engineering, Faculty of Engineering, Prince of Songkla University, Songkhla, Thailand^1

关键词: Commercial software;    Enhancement of heat transfer;    Flow charac-teristics;    Heat Transfer enhancement;    Heat transfer measurements;    Heat transfer surfaces;    Thin foil technique;    Uniform velocities;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/243/1/012006/pdf
DOI  :  10.1088/1757-899X/243/1/012006

来源: IOP

【 摘 要 】

The aim of this research was to study the effect of jet-mainstream velocity ratio on flow and heat transfer characteristics of jet on flat plate flow. The jet from pipe nozzle with inner diameter of D=14 mm was injected perpendicularly to mainstream on flat plate. The flat plate was blown by mainstream with uniform velocity profile at 10 m/s. The velocity ratio (jet to mainstream velociy) was varied at VR=0.25 and 3.5 by adjusting velocity of jet flow. For heat transfer measurement, a thin foil technique was used to evaluate the heat transfer coefficient by measuring temperature distributions on heat transfer surface with constant heat flux by using infrared camera. Flow characteristics were simulated by using a computational fluid dynamics (CFD) with commercial software ANSYS Fluent (Ver.15.0). The results showed that the enhancement of heat transfer along downstream direction for the case of VR=0.25 was from the effect of jet stream whereas for the case of VR=3.5 was from the effect of mainstream.