Numerical Simulation of Performance Augmentation in a Plate Fin Heat Exchanger Using Winglet Type Vortex Generators

Ebrahimi, Amin; Kheradmand, Saeid

doi:10.11159/ijmem.2012.014

Cited by 10 publications

(11 citation statements)

References 27 publications

(26 reference statements)

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“…The ability of the solver to reliably predict Newtonian fluid flow and heat transfer in rectangular channels with VGs was assessed in previous studies conducted by the authors [14,16,21]. The solver has been extended to model non-Newtonian fluid flow and heat transfer.…”

Section: Solver Verificationmentioning

confidence: 99%

Laminar convective heat transfer of shear-thinning liquids in rectangular channels with longitudinal vortex generators

Ebrahimi

Naranjani

Milani

et al. 2017

Chemical Engineering Science

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Heat and fluid flow in a rectangular channel heat sink equipped with longitudinal vortex generators have been numerically investigated in the range of Reynolds numbers between 25 and 200. Aqueous solutions of carboxymethyl cellulose (CMC) with different concentrations (200-2000 ppm), which are shear-thinning non-Newtonian liquids, have been utilised as working fluid. Three-dimensional simulations have been performed on a plain channel and a channel with five pairs of vortex generators. The channels have a hydraulic diameter of 8 mm and are heated by constant wall temperature. The vortex generators have been mounted at different angles of attack and locations inside the channel. The shear-thinning liquid flow in rectangular channels with longitudinal vortex generators are described and the mechanisms of heat transfer enhancement are discussed. The results demonstrate a heat transfer enhancement of 39-188% using CMC aqueous solutions in rectangular channels with LVGs with respect to a Newtonian liquid flow (i.e. water). Additionally, it is shown that equipping rectangular Page 2 of 40 channels with LVGs results in an enhancement of 24-135% in heat transfer performance visà-vis plain channel. However, this heat transfer enhancement is associated with larger pressure losses. For the range of parameters studied in this paper, increasing the CMC concentration, the angle of attack of vortex generators and their lateral distances leads to an increase in heat transfer performance. Additionally, heat transfer performance of rectangular channels with longitudinal vortex generators enhances with increasing the Reynolds number in the laminar flow regime.

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Section: Solver Verificationmentioning

confidence: 99%

Laminar convective heat transfer of shear-thinning liquids in rectangular channels with longitudinal vortex generators

Ebrahimi

Naranjani

Milani

et al. 2017

Chemical Engineering Science

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“…In 1969, Johnson and Joubert [34] used Vortex Generators (VGs), a case in point in passive approach, to improve the heat transfer for the first time. The flow separation from the side edges of VGs generates longitudinal, transverse and horseshoe vortices which form secondary flow, intensify fluid mixing and distort the thermal boundary layer causing higher heat transfer rate [35][36][37]. At small attack angles of VGs the mainly longitudinal vortices are dominant which potentially could lead to greater heat transfer augmentation with less required pumping power compared to transverse vortices generated at high attack angles of VGs [38].…”

Section: Introductionmentioning

confidence: 99%

Heat transfer and entropy generation in a microchannel with longitudinal vortex generators using nanofluids

Ebrahimi

Rikhtegar

Sabaghan

et al. 2016

Energy

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199

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Conjugated heat transfer and hydraulic performance for nanofluid flow in a rectangular microchannel heat sink with longitudinal vortex generators (LVGs) are numerically investigated using a finite-volume approach at different ranges of Reynolds numbers. Steadystate three-dimensional simulations are performed on a microchannel heated by a constant heat flux with a hydraulic diameter of 160 μm and six pairs of LVGs using a single-phase model. Coolants are selected to be nanofluids containing low volume-fractions (0.5%-3.0%) of Al2O3 or CuO nanoparticles with different particle sizes dispersed in pure water. The proposed model is validated and compared by already-published experimental, and single-phase and two-phase numerical data for various geometries and nanoparticle sizes. The comparison of results obtained from proposed single-phase model and two-phase model favours the former. The results demonstrate that heat transfer is enhanced by 2.29-30.63% and 9.44%-53.06% for water-Al2O3 and water-CuO nanofluids, respectively, in expense of increasing the pressure drop with respect to pure-water by 3.49%-16.85% and 6.5%-17.70%, respectively. We have also observed that the overall efficiency is improved by 2.55%-29.05% and 9.78%-50.64% for water-Al2O3 and water-CuO nanofluids, respectively. The results are also analyzed in terms of entropy generation, leading to the important conclusion that using nanofluids as the working fluid could reduce the irreversibility level in the rectangular microchannel heat sinks with LVGs. No exterma (minimum) is found for total entropy generation for the ranges of parameters studied.

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“…In order to assess the effect of the proposed VGs on the overall heat transfer performance of the plain channel, the following parameter is used as in [30]:…”

Section: Model Validationmentioning

confidence: 99%

2D Numerical Study of Heat Transfer Enhancement Using Fish-Tail Locomotion Vortex Generators

Yousif¹,

Kadhim²,

Al-Chlaihawi³

2021

MMEP

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In this paper, a numerical simulation is performed to study the effect of two types of concave vortex generators (VGs), arranged as fish-tail locomotion in a rectangular channel. The heat transfer and fluid flow characteristics with and without VGs are examined over the Reynolds number range 200≤Re≤2200.The two proposed types of the VGs are selected based on the speed of the fish movement which is arranged in different distances between them (d/H=0.6, 1, 1.3). The results show that the use of VGs can significantly enhance the heat transfer rate, but also increases the friction factor. The heat transfer performance is enhanced by (4-21.1%) reaching the maximum value by using the first type of the VGs at (d/H=1.3) due to better mixing of secondary flow and the new arrangement of the VGs which lead to decreasing the friction factor with an easy flow of fluid.

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Numerical Simulation of Performance Augmentation in a Plate Fin Heat Exchanger Using Winglet Type Vortex Generators

Cited by 10 publications

References 27 publications

Laminar convective heat transfer of shear-thinning liquids in rectangular channels with longitudinal vortex generators

Laminar convective heat transfer of shear-thinning liquids in rectangular channels with longitudinal vortex generators

Heat transfer and entropy generation in a microchannel with longitudinal vortex generators using nanofluids

2D Numerical Study of Heat Transfer Enhancement Using Fish-Tail Locomotion Vortex Generators

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