Title :
Numerical simulation on turbulent flow and heat transfer of the square cross-section helical duct
Author :
Hongxia Chen ; Wei Wang ; Jinliang Xu
Author_Institution :
Sch. of Renewable Energy, North China Electr. Power Univ., Beijing, China
Abstract :
A three-dimensional model was established to investigate the flow and heat transfer of square helical duct in which constant heat flux were specified in the inside wall and the turbulent flow at Re=28628 was considered. As a result, it was found that the area of turbulent region was larger at import region. Then, the centre of turbulent region closed to the inner wall. Meanwhile, the largest axial velocity was near the external wall. The turbulent intensity and the Nu number changed to stabilize after the spiral angle of 450°. In the cross-section, the emergence of multiple secondary flows enhanced the asymmetry of flow and heat transfer.
Keywords :
ducts; heat transfer; numerical analysis; pipes; turbulence; constant heat flux; external wall; flow transfer; heat transfer; inner wall; numerical simulation; secondary flows; square cross-section helical duct; square helical duct; square spiral pipe; three-dimensional model; turbulent flow; turbulent intensity; Ducts; Electron tubes; Fluids; Friction; Heat transfer; Mathematical model; Spirals; Flow; Fluent; Heat transfer; Helical duct; Square cross-section;
Conference_Titel :
Materials for Renewable Energy and Environment (ICMREE), 2013 International Conference on
Conference_Location :
Chengdu
Print_ISBN :
978-1-4799-3335-8
DOI :
10.1109/ICMREE.2013.6893710
