Analyses and Comparison of Solar Air Heater with Various Rib Roughness using Computational Fluid Dynamics (CFD)

International Conference on Recent Advances in Materials, Mechanical and Civil Engineering

材料科学;机械制造;土木建筑工程

Ravi Kumar, K.^1 ; Cheepu, Muralimohan^2 ; Srinivas, B.^1 ; Venkateswarlu, D.^3 ; Pramod Kumar, G.^1 ; Shiva, Apireddi^4

Department of Mechanical Engineering, MVGR College of Engineering, Andhra Pradesh

535005, India^1

Department of Mechatronics Engineering, Kyungsung University, Busan

48434, Korea, Republic of^2

Department of Mechanical Engineering, Marri Laxman Reddy Institute of Technology and Management, Telangana

500043, India^3

Department of Mechanical Engineering, Satya Institute of Technology and Management, Andhra Pradesh

535002, India^4

关键词: Artificial roughness;    Computational fluid dynamics modeling;    Computational Fluid Dynamics software;    Effective parameters;    Equilateral triangles;    Friction characteristics;    Heat transfer rate;    Turbulence kinetic energy;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/330/1/012061/pdf
DOI  :  10.1088/1757-899X/330/1/012061

来源: IOP

【 摘 要 】

In solar air heater, artificial roughness on absorber plate become prominent technique to improving heat transfer rate of air flowing passage as a result of laminar sublayer. The selection of rib geometries plays important role on friction characteristics and heat transfer rate. Many researchers studying the roughness shapes over the years to investigate the effect of geometries on the performance of friction factor and heat transfer of the solar air heater. The present study made an attempt to develop the different rib shapes utilised for creating artificial rib roughness and its comparison to investigate higher performance of the geometries. The use of computational fluid dynamics software resulted in correlation of friction factor and heat transfer rate. The simulations studies were performed on 2D computational fluid dynamics model and analysed to identify the most effective parameters of relative roughness of the height, width and pitch on major considerations of friction factor and heat transfer. The Reynolds number is varied in a range from 3000 to 20000, in the current study and modelling has conducted on heat transfer and turbulence phenomena by using Reynolds number. The modelling results showed the formation of strong vortex in the main stream flow due to the right angle triangle roughness over the square, rectangle, improved rectangle and equilateral triangle geometries enhanced the heat transfer extension in the solar air heater. The simulation of the turbulence kinetic energy of the geometry suggests the local turbulence kinetic energy has been influenced strongly by the alignments of the right angle triangle.