Heat Transfer Enhancement in Solar Air Heater Duct Fitted With Punched Hole Delta Winglets

International Conference on Advances in Materials and Manufacturing Applications 2016

Warrier, Hithesh U.^1 ; Kotebavi, Vinod.M.^1

Department of Mechanical Engineering, Amrita Vishwa Vidyapeetham, Bengaluru, India^1

关键词: Delta-winglet pairs;    Experimental and numerical analysis;    Friction factors;    Heat Transfer enhancement;    Numerical results;    Solar air heater;    Thermal Performance;    Vortex generators;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/149/1/012225/pdf
DOI  :  10.1088/1757-899X/149/1/012225

来源: IOP

【 摘 要 】

This paper investigates the thermal performance of solar air heater fitted with delta winglet type vortex generators with holes punched on it by experimental and numerical analysis. Delta winglet type vortex generators having holes punched onto it are fitted in a duct of size 400∗300∗30mm.it is placed in duct in 3 different configurations, as an array having 5 pair in one row. Delta winglet pair has an attack angle of 30degree, with height of winglet equal to half of duct height. The study is done for Reynolds's no in the range of 9000 to 25000. Thermal performance is evaluated by analyzing both friction factor and Nussult's number using Webb's correlation for surface roughness. Numerical simulation is done using Ansys fluent. Experimental and numerical results are then compared. Results shows that heat transfer enhancement of about 20-150% can be achieved by using punched hole delta winglet.