scholarly journals Flow and heat transfer in the separation region behind a backward-facing step with convergently mounted plates of longitudinal vortex generator

2021 ◽  
Vol 2119 (1) ◽  
pp. 012012
Author(s):  
V I Terekhov ◽  
A Yu Dyachenko ◽  
V L Zhdanov ◽  
Ya J Smulsky ◽  
K A Sharov
Keyword(s):  
Heat Transfer ◽  
Thermal Characteristics ◽  
Vortex Generator ◽  
Separated Flow ◽  
Vortex Generators ◽  
Longitudinal Vortex ◽  
Separation Region ◽  
Backward Facing Step ◽  
Flow And Heat Transfer ◽  
Thermohydraulic Efficiency

Abstract The paper presents the results of an experimental study of the dynamics of separated flow and heat transfer behind a backward-facing step when using longitudinal vortex generators (LVGs) at an angle of -30º at Re = 4000. Longitudinal vortex generators represent a pair of plates with a height of 6 mm, located symmetrically relative to the flow. Along with the average values, the pulsation characteristics of the flow are considered. The thermohydraulic efficiency was estimated by the found dynamic and thermal characteristics.

scholarly journals Features of air flow and heat transfer control behind a backward-facing step using a vortex generator pair

2021 ◽  
Vol 2057 (1) ◽  
pp. 012011
Author(s):  
V I Terekhov ◽  
A Yu Dyachenko ◽  
V L Zhdanov ◽  
Ya J Smulsky ◽  
K A Sharov
Keyword(s):  
Heat Transfer ◽  
Thermal Characteristics ◽  
Vortex Generator ◽  
Longitudinal Vortex ◽  
Recirculation Region ◽  
Separation Region ◽  
Backward Facing Step ◽  
Longitudinal Vortices ◽  
Flow And Heat Transfer ◽  
Thermohydraulic Efficiency

Abstract The paper presents experimental results on the study of flow dynamics and heat transfer in the separation region behind the backward-facing step with longitudinal vortex generators (VG) installed at an angle to the flow of 30° at Re = 4000. The VG installation reduces the recirculation region and the induced longitudinal vortices and rearranges the flow structure in the separation region. The influence of a VG on the local and average thermal characteristics behind the backward-facing step is investigated and their thermohydraulic efficiency is estimated.

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%.

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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