Title: Computational investigation of heat transfer enhancement by alternating inclined ribs in tubular heat exchanger
Authors: Suvanjan Bhattacharyya; Himadri Chattopadhyay; Ali Cemal Benim
Addresses: Mechanical Engineering Department, MCKV Institute of Engineering, Howrah, 711204, West Bengal, India ' Mechanical Engineering Department, Jadavpur University, Kolkata, 700 032, West Bengal, India ' Center of Flow Simulation (CFS), Department of Mechanical and Process Engineering, Duesseldorf University of Applied Sciences, Muensterstr, 156, D-40476, Duesseldorf, Germany; Institute of Thermal Power Engineering, Department of Mechanical Engineering, Cracow University of Technology, Al. Jana Paw?a II 37, 31-864 Cracow, Poland
Abstract: This paper encapsulates results of a numerical investigation on flow and heat transfer of an incompressible medium with constant properties through an isothermal circular tube with alternating inclined ribs. Simulations are conducted for laminar, transitional, and turbulent flow regimes. As turbulence model, the transitional shear stress transport model is employed. The problem is investigated for four rib angle of attack values, as well as for a plain tube without any ribs. All configurations are observed to lead to a thermal performance factor close to or greater than unity. Within the investigated range, the larger thermal performance factors are observed to occur for the intermediate Reynolds numbers. Maximum values in the range 2.0-2.5 are predicted for the Reynolds number of 2,000, where a subsequent drop to values within the range 1.0-1.5 are found to occur for Reynolds numbers around 3,000-4,000, which may be attributed to the transitional effects.
Keywords: forced convection; heat transfer enhancement; inclined ribs; transitional turbulence; CFD.
Progress in Computational Fluid Dynamics, An International Journal, 2017 Vol.17 No.6, pp.390 - 396
Received: 02 Nov 2016
Accepted: 07 Aug 2017
Published online: 19 Dec 2017 *