Influence of Ejection on Average Heat Transfer Characteristics with Delta Wing Vortex Generators in a Square Duct
M. K. Nalawade1 and R. P. Vedula2
1Department of Mechanical Engineering, Vishwakarma Institute of Technology, Pune 411 037, India.
mukundnalawade@gmail.com
2Department of Mechanical Engineering, Indian Institute of Technology Bombay, Powai 400 076, India.
rpv@me.iitb.ac.in
ABSTRACT
The influence of ejection on heat transfer performance in presence of delta wing vortex generators on two opposite walls in a square duct has been experimentally investigated in this study. The effect of ejecting 10-20% of mainstream flows on rough wall heat transfer performance by delta wings was experimentally investigated in this study. The present work focuses on uniform bleed rates and placement of bleed hole at the center between two adjacent vortex generators in a square duct of hydraulic diameter 30 mm. Three Reynolds numbers (16000, 24000 and 32000) based on duct hydraulic diameter and two flow rates of ejection (10% and 20%) were used to investigate the effect of ejection on the heat transfer enhancement by delta wing vortex generators. The results are presented in the form of the ratio of Nusselt number with and without vortex generators at equal Reynolds number (Nu/Nus) conditions. No appreciable change in the rough wall heat transfer coefficients was noticed.
Keywords: Bleed, Heat transfer enhancement, Delta wing
and Vortex generators.
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