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ARTICLE
3D NUMERICAL INVESTIGATION ON LAMINAR FORCED CONVECTION AND HEAT TRANSFER IN A CIRCULAR TUBE INSERTED WITH RIGHT TRIANGULAR WAVY SURFACES
Withada Jedsadaratanachaia, Amnart Boonloib,*
a Department of Mechanical Engineering, Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand
b Department of Mechanical Engineering Technology, College of Industrial Technology, King Mongkut’s University of Technology North Bangkok,
Bangkok 10800, Thailand
Frontiers in Heat and Mass Transfer 2017, 8, 1-8. https://doi.org/10.5098/hmt.8.35
Abstract
Numerical investigations on flow and heat transfer characteristics in a circular tube heat exchanger inserted with right triangular wavy surfaces are
reported. The configurations of the wavy surfaces; incline and V-shape, are studied with flow attack angles of 30o, 45o and 60o for the Reynolds
numbers,
Re = 100 – 2000. The numerical results are compared with the smooth circular tube. The mechanisms on flow and heat transfer in the tube
heat exchanger with the wavy surface are presented. As the results, the wavy surface can generate the vortex flow and impinging flow through the
test section that helps to improve the heat transfer rate and thermal performance. The impingement of the flow on the tube wall disturbs the thermal
boundary layer that is an important factor to enhance the heat transfer rate. The V-Downstream wavy surface can create the highest strength of the
impinging flow that leads to the highest heat transfer rate. In the range investigate, the augmentations are around 1.2 – 7.6 and 4 – 43.6 times above
the smooth tube for the heat transfer and friction loss, respectively. In addition, the optimum thermal enhancement factor,
TEF, is around 2.42 for the
V-Downstream wavy surface at α = 30o and
Re = 2000.
Keywords
Cite This Article
Jedsadaratanachai, W., Boonloi, A. (2017). 3D NUMERICAL INVESTIGATION ON LAMINAR FORCED CONVECTION AND HEAT TRANSFER IN A CIRCULAR TUBE INSERTED WITH RIGHT TRIANGULAR WAVY SURFACES.
Frontiers in Heat and Mass Transfer, 8(1), 1–8.