Numerical Prediction of Heat Transfer in a Channel With a Built-in Oval Tube and Various Arrangements of the Vortex Generators

Prabhakar, V.; Biswas, Gautam; Eswaran, V.

doi:10.1080/716100508

Cited by 25 publications

(10 citation statements)

References 12 publications

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“…Different configurations, i.e., placements of DWPs in a channel with oval tube, were investigated by Prabhakat et al [62]. considered, as many as nine possible configurations have been envisaged.…”

Section: Summary Of Resultsmentioning

confidence: 99%

Augmentation of Heat Transfer by Creation of Streamwise Longitudinal Vortices Using Vortex Generators

Biswas

Chattopadhyay

Sinha

2012

Heat Transfer Engineering

107

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This paper summarizes the current state of the art related to improvement of the heat exchanger surfaces using streamwise longitudinal vortices. Primarily, the improvements related to fin-tube cross-flow heat exchangers and the plate-fin heat exchangers have been addressed. Protrusions in certain forms, such as delta wings or winglet pairs, act as vortex generators, which can enhance the rate of heat transfer from the heat-exchanger surfaces that may be flat or louvered. The strategically placed vortex generators create longitudinal vortices, which disrupt the growth of the thermal boundary layer, promote mixing between fluid layers, and hence lead to augmentation in heat transfer. The flow fields are dominated by swirling motion associated with modest pressure penalty. Heat transfer is augmented substantially for all the proposed configurations of the longitudinal vortex generators, such as delta wings, rectangular winglet pairs, and delta winglet pairs, with varying degree of pressure penalty. Both computational and experimental investigations on flow and heat transfer in the heat exchanger passages with built-in vortex generators are revisited and summarized.

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Section: Summary Of Resultsmentioning

confidence: 99%

Augmentation of Heat Transfer by Creation of Streamwise Longitudinal Vortices Using Vortex Generators

Biswas

Chattopadhyay

Sinha

2012

Heat Transfer Engineering

107

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“…Moreover, the experimental measurement of the conjugate local heat transfer of a tube bank fin element is scarcely reported. Recently, along with the improvement of numerical methods and the development of computer technology, the numerical simulation has become a powerful research tool to alleviate the effort of doing experiments in order to select a new fin pattern [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21], and the trend is possibly toward a method to design a heat exchanger numerically. But by substituting numerical simulation for real experiment, a certainty that the numerical model correctly describes the real system, has to exist.…”

Section: Multi-domain Coupled Numerical Methods For Heat Exchanger 1205mentioning

confidence: 99%

A Multi-Domain Coupled Numerical Method for a Flat Tube Bank Fin Heat Exchanger with Delta-Winglet Vortex Generators

Lin

Wang

2014

Numerical Heat Transfer, Part A: Applications

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Along with the improvement of numerical methods and the development of computer power, using a numerical method to design a tube bank fin heat exchanger becomes increasingly possible. In real working conditions, the conjugate heat transfer process arises in this type of exchanger. To provide a feasible numerical model and its relevant method to properly assess the thermal performance of exchanger, in this article, a multi-domain coupled numerical method is presented, in which the conduction in solid regions and the convection in flow regions are calculated together with a fully coupled manner. The reliability of a numerical method was tested through comparing average numerical results with experimental results of a real heat exchanger. The results reveal that the multi-domain coupled numerical method can achieve more accurate positions of the interfaces, arrange the orthogonal grids close to the interfaces, and use more reasonable criteria of convergence. Thus, we have achieved reasonable results that agree with the experimental data of the real heat exchanger under the working condition within 10% deviation in the Reynolds number region studied, and got overall heat transfer coefficient of a flat tube bank fin heat exchanger.

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“…The array of three rows of vortex generators showed promising results in terms of improved heat transfer characteristics, however, at the expense of a large drop in pressure. Prabhakar et al [12] worked on an oval tube-fin heat exchanger with nine different arrangements of delta winglet vortex generators. Some other related works [13,14] are also available in the literature.…”

Section: Heat Transfer-asian Research 39 (3) 2010mentioning

confidence: 99%

Heat transfer enhancement by using a rectangular wing vortex generator on the triangular shaped fins of a plate‐fin heat exchanger

Sachdeva

Kasana

Vasudevan

2010

Heat Trans. Asian Res.

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The present numerical analysis pertains to the heat transfer enhancement in a plate-fin heat exchanger employing triangular shaped fins with a rectangular wing vortex generator on its slant surfaces. The study has been carried out for three different angles of attack of the wing, i.e., 15°, 20° and 26°. The aspect ratio of the wing is not varied with its angle of attack. The flow considered herein is laminar, incompressible, and viscous with the Reynolds number not exceeding 200. The pressure and the velocity components are obtained by solving the continuity and the Navier-Stokes equations by the Marker and Cell method. The present analysis reveals that the use of a rectangular wing vortex generator at an attack angle of 26° results in about a 35% increase in the combined spanwise average Nusselt number as compared to the plate-triangular fin heat exchanger without any vortex generator.

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Numerical Prediction of Heat Transfer in a Channel With a Built-in Oval Tube and Various Arrangements of the Vortex Generators

Cited by 25 publications

References 12 publications

Augmentation of Heat Transfer by Creation of Streamwise Longitudinal Vortices Using Vortex Generators

Augmentation of Heat Transfer by Creation of Streamwise Longitudinal Vortices Using Vortex Generators

A Multi-Domain Coupled Numerical Method for a Flat Tube Bank Fin Heat Exchanger with Delta-Winglet Vortex Generators

Heat transfer enhancement by using a rectangular wing vortex generator on the triangular shaped fins of a plate‐fin heat exchanger

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