@Article{hmt.6.13,
AUTHOR = {Withada Jedsadaratanachai, Amnart Boonloi},
TITLE = {INFLUENCES OF THE PUNCHED DELTA WINGLET VORTEX  GENERATORS IN A CIRCULAR TUBE HEAT EXCHANGER ON  THERMO-HYDRAULIC PERFORMANCE},
JOURNAL = {Frontiers in Heat and Mass Transfer},
VOLUME = {6},
YEAR = {2015},
NUMBER = {1},
PAGES = {1--19},
URL = {http://www.techscience.com/fhmt/v6n1/54731},
ISSN = {2151-8629},
ABSTRACT = {Numerical investigations on flow topology, heat transfer behavior and thermal performance evaluation in a circular tube heat exchanger with the 
punched delta winglet vortex generators (PDWVG) inserted in the middle of the test section are presented. The effects of the flow attack angles that 
converging to the center of the tube; <i>α</i> = 0°, 5°, 10°, 15°, 20°, 25°, and flow directions; winglet tips pointing downstream and upstream, are 
investigated for the Reynolds numbers; <i>Re</i> = 100 – 2000. The finite volume method and SIMPLE algorithm are used for the current study. The results 
are presented in terms of flow configuration, heat transfer behavior and thermal performance assessments and also compared with the smooth tube 
with no <i>PDWVG</i>. As numerical results, the use of <i>PDWVG</i> inserted in the tube can help to improve heat transfer rate and thermal performance in the 
heat exchanger by creating the vortex flows through the test section. The rise of the flow attack angle and Reynolds number leads to increase in heat 
transfer, friction loss and thermal performance. The optimum <i>TEF</i> is around 2.33 at <i>Re</i> = 2000, <i>α</i> = 25° for winglet tip pointing downstream.},
DOI = {10.5098/hmt.6.13}
}