Iranian Journal of Mechanical Engineering Transactions of ISME

Iranian Journal of Mechanical Engineering Transactions of ISME

Numerical Simulation on Passive Heat Transfer Enhancement of Consecutive Rectangular Ribs into Channel

Authors
Amin Alami nia 1
Amir Alamgholilou 2
1 Assistant Professor, Department of Mechanical Engineering, Azarbaijan Shahid Madani University, Tabriz, 53751-71379, Iran
2 Department of Mechanical Engineering, Azarbaijan Shahid Madani University, Tabriz, 53751-71379, Iran
10.30506/ijmep.2025.2028606.1977
Abstract
In the present study, the forced convection heat transfer enhancement of ribs established on the floor of rectangular duct with passive method was investigated. Heat transfer enhancement methods are investigated by performance evaluation criteria method. Passive method is also used to investigate this enhancement. The consecutive ribs were used as local heat sources. The flow was 3 dimensional, turbulent, steady, viscous and incompressible with Reynolds numbers has been carried out by numerical simulation of PHOENICS software. The hydrodynamics and heat transfer behavior of this flow was studied by passive method of enhancement and application of holes.
The innovation of the present research is the use of a passive method by creating holes with different arrangements in suction and blow modes (without external energy consumption) in the form of 9 consecutive ribs with a highly turbulent flow with very high Reynolds numbers. In this innovation, special attention has been paid to the production of vortices (single and multiple vortices) in the area between the consecutive ribs.
The numerical results show that the arrangement of staggered near to wall for holes is the best between the 5 arrangements. The comparison and validation of the results with experimental data for various boundary conditions was fairly agreement. The maximum average heat transfer increase rate for the suction mode for the zigzag arrangement close to the wall is 192.4% and 376.7% at velocities of 3 and 15 m/s, respectively.
Keywords
Heat transfer enhancement
Convection
Duct flow
Passive method
Rib

Subjects

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  • Receive Date 02 November 2024
  • Revise Date 05 June 2025
  • Accept Date 22 July 2025