Computational investigation on heat transfer augmentation of a circular tube with novel hybrid ribs

¹ Department of Mechanical Engineering, Birla Institute of Technology and Science, Pilani, Pilani Campus, Vidya Vihar, Rajasthan 333031, India
² Department of Mechanical Engineering, National Institute of Technology Agartala, Tripura, India
³ Center of Flow Simulation (CFS), Duesseldorf University of Applied Sciences, Germany
⁴ Université Paris Saclay, 61 avenue du Président Wilson, 94230 Cachan, France
⁵ Department of Applied Mechanics, Motilal Nehru National Institute of Technology Allahabad, Prayagraj, UP, India
⁶ Department of Mechanical Engineering, Mechatronics and Industrial Design, Tshwane University of Technology, Private Bag X860, Pretoria 0001, South Africa

^* Corresponding author: suvanjan.bhattacharyya@pilani.bits-pilani.ac.in

Abstract

Present study reports a computational investigation on heat transfer and pressure drop characteristics for flow through a heat exchanger tube fitted with novel hybrid ribs by using magnetic nanofluid (Fe₃O₄). Effects of different rib geometry on heat transfer and pressure drop characteristics have been investigated for Reynolds number ranging from 3 000 to 22 000. Until now, there is little information available in the literature on the method of quantifying the effect of forced convection on the heat transfer and pressure drop of hybrid rib (HR) inserts by using magnetic nanofluid (MNF). The transition SST models along with governing equations (continuity, momentum, and energy equations) are numerically solved with ANSYS Fluent 19.2. The simulation results are validated with established correlations and excellent agreement was found. Heat transfer coefficient is more in combined arrangement (HR and MNF) compared to acting alone arrangement (only MNF).