Numerical Investigation of Fluid Flow and Heat Transfer in a Rectangular Channel with Longitudinal Vortex Generators

2017 ◽  
Vol 6 (8) ◽  
pp. 410
Author(s):  
M. Vinoop Reddy ◽  
N. Viswa Sairam
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Numerical Investigation ◽  
Rectangular Channel ◽  
Vortex Generators ◽  
Longitudinal Vortex ◽  
Flow And Heat Transfer

Numerical Study of Flow and Heat Transfer in Rectangular Channel With Periodic Longitudinal Vortex Generators Under Pulsating Flow

2012 ◽  
Author(s):  
Lin Tian ◽  
Wei Bai ◽  
Shanhu Xue ◽  
Zipeng Huang ◽  
Qiuwang Wang
Keyword(s):  
Heat Transfer ◽  
Nusselt Number ◽  
Friction Factor ◽  
Numerical Study ◽  
Rectangular Channel ◽  
Vortex Generators ◽  
Longitudinal Vortex ◽  
Small Scale ◽  
Inlet Velocity ◽  
Flow And Heat Transfer

The unsteady turbulent flow and heat transfer in rectangular channel with periodic longitudinal vortex generators on up and bottom walls are investigated by standardized k-ε two equation turbulent model combined with standardized wall function which has been validated by steady experimental data. Influence of varying frequency and amplitude of inlet velocity varying by sine function on heat transfer and friction factor are discussed. It is found that parameters such as Tout, Tf, Tw, Nusselt number and the friction factor f vary with time periodically, phase difference occurred compared with inlet velocity. Pulsating frequency has little impact on time averaged Nusselt number. However, when amplitude increases from 0.2us to 0.8us, the heat transfer rate is augmented by about 4%. Furthermore, a critical frequency has been captured when amplitude equals to 0.8us for the channel studied. The current study will deepen understanding of unsteady flow in plate fuel assembly, which can be used in small-scale reactors.

The Effects of Arrangement of Longitudinal Vortex Generators on the Flow and Heat Transfer in the Rectangular Channel

2014 ◽  
Vol 694 ◽  
pp. 205-210
Author(s):  
Nan Cai ◽  
Li Ting Tian ◽  
Chun Hua Min ◽  
Cheng Yin Qi
Keyword(s):  
Heat Transfer ◽  
Flow Resistance ◽  
Heat Transfer Performance ◽  
Rectangular Channel ◽  
Vortex Generator ◽  
Vortex Generators ◽  
Longitudinal Vortex ◽  
Flow And Heat Transfer ◽  
Rectangular Channels ◽  
Flow Drag

In this paper, the heat transfer performance and flow resistance characteristics of the asymmetric arrangement of the rectangular winglet longitudinal vortex generators in the rectangular channels are numerically studied. Results show that at Re=500~2000, comparing with the symmetric arrangement of the longitudinal vortex generator, the Nusselt number of the asymmetric arrangement of the longitudinal vortex generator only decreased by 4% ~ 6%,while,the friction factor f decreases by 11% ~ 22%,the effect of flow drag reduction is very obvious. The asymmetric arrangements of the longitudinal vortex generators show the better overall thermal performance with the increase of j/f by 5% ~ 20%.

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