Numerical study of heat transfer enhancement of finned flat tube bank fin with vortex generators mounted on both surfaces of the fin

2007 ◽  
Vol 44 (8) ◽  
pp. 959-967 ◽  
Author(s):  
Ke-Wei Song ◽  
Liang-Bi Wang ◽  
Ju-Fang Fan ◽  
Yong-Heng Zhang ◽  
Song Liu
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Enhancement ◽  
Numerical Study ◽  
Vortex Generators ◽  
Transfer Enhancement ◽  
Tube Bank ◽  
Flat Tube ◽  
Finned Flat Tube Bank

Tube Transverse Pitch Effect on Heat/Mass Transfer Characteristics of Flat Tube Bank Fin Mounted With Vortex Generators

2008 ◽  
Vol 130 (6) ◽  
Author(s):  
Song Liu ◽  
Liangbi Wang ◽  
Jufang Fan ◽  
Yongheng Zhang ◽  
Yuanxin Dong ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Heat Transfer Enhancement ◽  
Heat Mass Transfer ◽  
Isothermal Condition ◽  
Vortex Generators ◽  
Transfer Enhancement ◽  
Tube Bank ◽  
Flat Tube ◽  
Tube Pitch

For one heat exchanger model of three-row flat tube bank fin mounted with vortex generators (VGs), the effect of transversal tube pitch on heat/mass transfer performance was investigated by the experimental method of naphthalene sublimation. For the same arrangement of VGs around the tube, it is found that the larger the transversal tube pitch, the larger the heat transfer enhancement because of less interactions of vortices generated from different VGs. Interaction of vortices decreases the heat transfer enhancement on the fin surfaces with and without VGs for the case with small transversal tube pitch. For isothermal condition, two correlated equations of average Nusselt number and friction factor considering the fin spacing, the attack angle of VG, the height of VG, the ratio of transversal tube pitch, and Reynolds number are reported.

A Numerical Study of Flow and Heat Transfer Enhancement Using an Array of Delta-Winglet Vortex Generators in a Fin-and-Tube Heat Exchanger

2006 ◽  
Vol 129 (9) ◽  
pp. 1156-1167 ◽  
Author(s):  
A. Joardar ◽  
A. M. Jacobi
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Heat Transfer Enhancement ◽  
Numerical Study ◽  
Flow Behavior ◽  
Vortex Generators ◽  
Computational Domain ◽  
Transfer Enhancement ◽  
Local Flow ◽  
Tube Heat Exchanger

This work is aimed at assessing the potential of winglet-type vortex generator (VG) “arrays” for multirow inline-tube heat exchangers with an emphasis on providing fundamental understanding of the relation between local flow behavior and heat transfer enhancement mechanisms. Three different winglet configurations in common-flow-up arrangement are analyzed in the seven-row compact fin-and-tube heat exchanger: (a) single–VG pair; (b) a 3VG-inline array (alternating tube row); and (c) a 3VG-staggered array. The numerical study involves three-dimensional time-dependent modeling of unsteady laminar flow (330⩽Re⩽850) and conjugate heat transfer in the computational domain, which is set up to model the entire fin length in the air flow direction. It was found that the impingement of winglet redirected flow on the downstream tube is an important heat transfer augmentation mechanism for the common-flow-up arrangement of vortex generators in the inline-tube geometry. At Re=850 with a constant tube-wall temperature, the 3VG-inline-array configuration achieves enhancements up to 32% in total heat flux and 74% in j factor over the baseline case, with an associated pressure-drop increase of about 41%. The numerical results for the integral heat transfer quantities agree well with the available experimental measurements.

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