CFD analysis of the impact of a novel spacer grid with longitudinal vortex generators on the sub-channel flow and heat transfer of a rod bundle

2017 ◽  
Vol 324 ◽  
pp. 78-92 ◽  
Author(s):  
J.M. Wu ◽  
H.Y. Liang ◽  
F.J. Zhu ◽  
J. Lei
Keyword(s):  
Heat Transfer ◽  
Channel Flow ◽  
Vortex Generators ◽  
Longitudinal Vortex ◽  
Cfd Analysis ◽  
Spacer Grid ◽  
Rod Bundle ◽  
Flow And Heat Transfer ◽  
The Impact

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.

Nanofluid flow and heat transfer in a microchannel with longitudinal vortex generators: Two-phase numerical simulation

2016 ◽  
Vol 100 ◽  
pp. 179-189 ◽  
Author(s):  
Amin Sabaghan ◽  
Mojtaba Edalatpour ◽  
Mohammad Charjouei Moghadam ◽  
Ehsan Roohi ◽  
Hamid Niazmand
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Vortex Generators ◽  
Longitudinal Vortex ◽  
Nanofluid Flow ◽  
Two Phase ◽  
Flow And Heat Transfer
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