Periodic Heat Transfer Characteristics in a Square Channel with Various RVG Positions

Authors

  • Amnart Boonloi King Mongkut’s University of Technology North Bangkok

Keywords:

Forced convection, Heat transfer characteristics, Periodic Heat transfer, Rib, Vortex generators

Abstract

This article, 3D numerical investigations on heat transfer behaviors and thermalperformance in a square channel with rib vortex generators (RVG) are presented. The effects of the RVGs with different gap ratio (g/H = 0 – 0.35) for the heat transfer profiles with constant blockage ratio (b/H, BR = 0.15), the pitch ratio (P/H, PR = 1) and flow attack angle (α = 30o) in an isothermal wall square channel are investigated for Reynolds number based on the hydraulic diameter of the square channel, Re = 100 – 1200. The SIMPLE algorithm and finite volume method (FVM) have applied for the computational domain. The mathematical results show that the RVGs with various positions produce the periodic profiles and the fully developed periodic profiles around the 2nd module and 6th – 9th module, respectively. The use of the RVGs performs a higher heat transfer rate than the smooth channel with no RVG in all cases. The enhancement of the heat transfer rate is around 1 – 9 times over the smooth channel depended on the g/H values and Reynolds numbers. Additionally, the thermal enhancement factor, TEF, is found to be maximum around 4.05 at g/H = 0.10 and Re = 1200.

References

W. Jedsadaratanachai, S. Suwannapan andP. Promvonge, “Numerical study of laminar heat transfer in baffled square channel with various pitchesâ€, Energy Procedia, Elsevier, vol. 9, pp. 630 – 642, 2011.

S. Kwankaomeng and P. Promvonge, “Numerical prediction on laminar heat transfer in square duct with 30° angled baffle on one wallâ€, International Communication in Heat and Mass Transfer, Elsevier,vol. 37, Issue 7, pp. 857–866, 2010.

P. Promvonge, W. Jedsadaratanachai and S. Kwankaomeng,“Numerical study of laminar flow and heat transfer in square channel with 30o inline angled baffle turbulatorsâ€, Applied Thermal Engineering,Elsevier,vol. 30, Issue 11-12, pp. 1292–1303, 2010.

P. Promvonge andS. Kwankaomeng,“Periodic laminar flow and heat transfer in a channel with 45° staggered V–bafflesâ€, International Communication in Heat and Mass Transfer, Elsevier, vol. 37, Issue 7, pp. 841–849, 2010.

P. Promvonge, S. Sripattanapipat and S. Kwankaomeng,“Laminar periodic flow and heat transfer in square channel with 45o inline baffles on two opposite wallsâ€, International Journal of Thermal Sciences, Elsevier,vol. 49, Issue 6, pp. 963–975, 2010.

P. Promvonge, W. Jedsadaratanachai, S. Kwankaomeng and C. Thianpong,“3D simulation of laminar flow and heat transfer in V–baffled square channelâ€,International Communication in Heat and Mass Transfer, Elsevier, vol. 39, Issue 1, pp. 85–93, 2012.

A. Boonloi, “Effect of Flow Attack Angle of V-Ribs Vortex Generators in a Square Duct on Flow Structure, Heat Transfer, and Performance Improvementâ€,Modeling and Simulation in Engineering, Hindawi,Article ID 985612, 11 pages, 2014.

A. Boonloi and W. Jedsadaratanachai,“3D Numerical study on laminar forced convection in V–baffled square channelâ€, American Journal of Applied Sciences, Science Publications, vol. 1, Issue 10, pp. 1287 – 1297, 2013.

W. Jedsadaratanachai, N. Jayranaiwachira and P. Promvonge,“Computational Investigation on Fully Developed Periodic Laminar Flow Structure in Baffled Circular Tube with Various BRâ€, Mathematical Problems in Engineering, Hindawi, Article ID 471720, 13 pages, 2014.

P. Promvonge, W. Changcharoen, S. Kwankaomeng and C. Thianpong,“Numerical heat transfer study of turbulent square-duct flow through inline V-shaped discrete ribsâ€,International Communication in Heat and Mass Transfer, Elsevier, vol. 28, Issue 10, pp.1392–1399, 2011.

W. Jedsadaratanachai, “Influences of RVG positions on the periodic flow profilesâ€,Mathematical Problems in Engineering, Hindawi, Article ID 752721, 17 pages, 2014.

F. Incropera andP.D. Dewitt PD,“Introduction to heat transferâ€, 5rd edition, John Wiley & Sons Inc, 2006.

Downloads

Published

2015-08-17

How to Cite

Boonloi, A. (2015). Periodic Heat Transfer Characteristics in a Square Channel with Various RVG Positions. Asian Journal of Applied Sciences, 3(4). Retrieved from https://www.ajouronline.com/index.php/AJAS/article/view/2765

Issue

Section

Articles

Most read articles by the same author(s)