Flow Structure and Heat Transfer Analysis in a Laminar Channel Flow with Built-in Side-by-Side Dual Triangular Prism

Gupta, Munish Kumar; Dudi, Rajesh; Kumar, Satish

doi:10.4103/0976-8580.86634

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…Installation of a vortex generator on a heat transfer surface is one of the best-known methods for enhancing heat transfer in heat exchangers. Many studies on vortex generators have been performed by adopting various shapes, such as cylinders, rectangular parallelepipeds, hexagonal prisms (Icoz and Jaluria 2006), triangular prisms (Prasath et al 2014) and delta wings ; by changing their size, position, angle (Meis et al 2010) and number (Gupta et al 2011); or by vibrating them (Fu et al 2001). In heat transfer enhancement, we should pay attention to a (local) pressure drop due to the installation of objects in the flow field and an increase in friction drag as a consequence of momentum transfer enhancement.…”

Section: Introductionmentioning

confidence: 99%

Dissimilar heat transfer enhancement by introduction of a vortex tube in plane Couette flow

Kubo¹,

Kawahara²,

Shimizu³

2021

Fluid Dyn. Res.

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Recent studies have suggested that a cyclonic vortex, which has the same signed vorticity as that of background shear, can lead to dissimilar heat transfer enhancement, i.e. more heat transfer than momentum transfer. However, it has not yet been known how the cyclonic vortex achieves dissimilarity, or if other types of vortices would also lead to dissimilarity. In order to tackle these problems, we introduce a straight vortex tube into laminar plane Couette flow under various conditions and numerically investigate heat and momentum transfer therein. The essential process for dissimilarity is isolated from complex ingredients of realistic flow to consider the interaction of a vortex with background shear. It is found that introduction of a strong spanwise anti-cyclonic vortex, which has the opposite signed vorticity to that of background shear, can realize more dissimilar heat transfer than the known cyclonic vortex as a consequence of the long-term interaction with the background flow, whereas the spanwise cyclonic vortex achieves larger dissimilarity in the early stage of its time evolution. The physical mechanisms of dissimilarity due to these vortices are elucidated by interpreting the distribution of the streamwise pressure gradient and the resulting difference between temperature and streamwise velocity around the vortex.

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Section: Introductionmentioning

confidence: 99%

Dissimilar heat transfer enhancement by introduction of a vortex tube in plane Couette flow

Kubo¹,

Kawahara²,

Shimizu³

2021

Fluid Dyn. Res.

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“…Flow around bluff bodies in ducts and channels has been investigated intensively by many researchers, both experimentally [1][2][3] and numerically [4][5][6], since this flow is of importance for different applications including electronic cooling and heat exchange systems. Within this context, a triangular prism as a bluff body is a basic configuration.…”

Section: Introductionmentioning

confidence: 99%

“…Chattopadhyay [8] investigated a similar configuration numerically for incompressible turbulent flows, by applying a steady-state Reynolds averaged Navier-Stokes equations (RANS) analysis based on a two-equation turbulence model. The pre-vious computational work [4][5][6][7][8] was principally based on the discretization of the Navier-Stokes equations. Also, Ellahi [9] is explained basics, concepts and methods of steady and unsteady flow for Newtonian and non-Newtonian fluids.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of incompressible fluid flow and heat transfer across a bluff body in a channel flow

Taymaz¹,

Aslan²,

Benim³

2015

THERM SCI

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The lattice Boltzmann method is applied to computationally investigate the laminar flow and heat transfer of an incompressible fluid with constant material properties in a 2-D channel with a built-in bluff body. In this study, a triangular prism is taken as the bluff body. Not only the momentum transport, but also the energy transport is modeled by the lattice Boltzmann method. A uniform lattice structure with a single time relaxation rule is used. For obtaining a higher flexibility on the computational grid, interpolation methods are applied, where the information is transferred from the lattice structure to the computational grid by Lagrange interpolation. The flow is investigated for different Reynolds numbers, while keeping the Prandtl number at the constant value of 0.7. The results show how the presence of a triangular prism effects the flow and heat transfer patterns for the steady-state and unsteady-periodic flow regimes. As an assessment of the accuracy of the developed lattice Boltzmann code, the results are compared with those obtained by a commercial computational fluid dynamics code. It is observed that the present lattice Boltzmann code delivers results that are of similar accuracy to the well-established computational fluid dynamics code, with much smaller computational time for the prediction of the unsteady phenomena.

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Flow and Heat Transfer Phenomena Across Two Confined Tandem Heated Triangular Bluff Bodies

Agarwal

Dhiman

2014

Numerical Heat Transfer, Part A: Applications

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Flow Structure and Heat Transfer Analysis in a Laminar Channel Flow with Built-in Side-by-Side Dual Triangular Prism

Cited by 4 publications

References 7 publications

Dissimilar heat transfer enhancement by introduction of a vortex tube in plane Couette flow

Dissimilar heat transfer enhancement by introduction of a vortex tube in plane Couette flow

Numerical investigation of incompressible fluid flow and heat transfer across a bluff body in a channel flow

Flow and Heat Transfer Phenomena Across Two Confined Tandem Heated Triangular Bluff Bodies

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