@Article{hmt.8.35,
AUTHOR = {Withada Jedsadaratanachai, Amnart Boonloi},
TITLE = {3D NUMERICAL INVESTIGATION ON LAMINAR FORCED  CONVECTION AND HEAT TRANSFER IN A CIRCULAR TUBE  INSERTED WITH RIGHT TRIANGULAR WAVY SURFACES},
JOURNAL = {Frontiers in Heat and Mass Transfer},
VOLUME = {8},
YEAR = {2017},
NUMBER = {1},
PAGES = {1--8},
URL = {http://www.techscience.com/fhmt/v8n1/53554},
ISSN = {2151-8629},
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, <i>Re</i> = 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, <i>TEF</i>, is around 2.42 for the 
V-Downstream wavy surface at α = 30o and <i>Re</i> = 2000.},
DOI = {10.5098/hmt.8.35}
}