Investigation of heat transfer in a rectangular duct fitted with V-shaped baffles
Article Sidebar
Main Article Content
Abstract
The present research investigated heat transfer in a rectangular duct with V-shaped baffles by using air as the heat transfer fluid. The V-shaped baffles were fabricated from twisted tapes having twist ratios (y/w) of 2, 3, 4, and 5. The baffles were installed with pitch ratios (p/w) = 4, 6, 8,10, and 12. Experiments were carried out in the Reynolds number range of 4,000 to 20,000. The presence of the baffles facilitated turbulence within the duct, resulting in boosting both heat transfer and friction factor. The V-shaped baffles with the narrowest pitch ratio (p/w = 4) and a moderate twist ratio (y/w = 3), offered the best thermal performance factor which was as high as 2.02 meanwhile the baffles with p/w = 6, 8, 10, and 12 gave the maximum thermal performance factors of 1.99, 1.93, 1.85 and 1.82, respectively.
Article Details
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Copyright @2021 Engineering Transactions
Faculty of Engineering and Technology
Mahanakorn University of Technology
References
W. Peng, P.X. Jiang, Y.P. Wang, B.Y.Wei, Experimental and numerical investigation of convection heat transfer in channels with different types of ribs, Applied Thermal Engineering 31 (2011) 2702-2708.
A. Lanjewar, J.L. Bhagoria, R.M. Sarviya, Heat transfer and friction in solar air heater duct with W-shaped rib roughness on absorber plate, Energy 36 (2011) 4531–4541.
W. Jedsadaratanachai, A. Boonloi, Effects of block a geratioand pitch ratio on thermal performance in a square channel with 30° double V-baffles, Case Studiesin Thermal Engineering 4 (2014) 118–128.
T. Alam, R.P. Saini, J.S. Saini, Effect of circularity of perforation holes in V-shaped blockages on heat transfer and friction characteristics of rectangular solar air heater duct, Energy Conversion and Management 86 (2014) 952-963.
W. Jedsadaratanachai, N. Jayranaiwachira, P. Promvonge, 3D numerical study on flow structure and heat transfer in a circular tube with V-baffles, Chinese Journal of Chemical Engineering 23 (2015) 342–349.
Houari Ameur, Effect of corrugated baffles on the flow and thermal fields in a channel heat exchanger, Journal of Applied and Computational Mechanics 6 (2020) 209–218.
Hayder Al-Lami, Murtadha Saeed Mohammed, Radhwan Ali, Ahmed Alshara, and Hussein Kareem Abdul Zahra, Characteristics of heat transfer and turbulent flow in a baffled pipe with different arrangements, European Journal of Engineering and Technology Research 7 (2022) 113–119.