Simulating tornado-like enhancement of heat transfer for low-velocity motion of air in a rectangular channel with cavities. Part 1: Selection and justification of calculation methods

Исаев, С. А.; Leont'ev, A. I.; Baranov, P. A.

doi:10.1134/s0040601507030044

Cited by 11 publications

(4 citation statements)

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“…8a and b), and the maxima of the relative heat transfer at the front and side edges of the dimple decrease and those at the back edge of the dimple increase somewhat with increase in Re. As in the earlier works [2,3], we detected the effect of decreasing the heat loads inside the deep dimple, and this effect enhanced with increase in Re (Fig. 8b).…”

Section: Discussion Of the Resultssupporting

confidence: 66%

“…Evolution of the velocity and temperature profi les v(y) and T(y) of the fl ow at the middle cross section of the channel z = 0 at Re = 10 3 (1) and 2.5·10 3(2) and different values of x: a, e) x = -0.75; b, f) 0; c, g) 0.55; d, h) 1.75. The dashed lines correspond to the plane-parallel channel with no dimple.…”

mentioning

confidence: 99%

“…Distributions of the relative heat transfer averaged over the band perpendicular to the selected direction along the longitudinal (a) and transverse (b) coordinates at Re = 10 3 (1) and 2.5·10 3(2).…”

mentioning

confidence: 99%

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Visualization of a Flow in a Spherical Dimple Built in the Lower Wall of the Rectangular-Section Channel of a Water Tunnel and Numerical Identification of the Vortex-Jet Structures in It

Исаев

Guzeev

Сапожников

et al. 2015

J Eng Phys Thermophy

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Numerical and physical simulations of a laminar separation fl ow over a single spherical dimple built in the lower wall of the rectangular-section plane-parallel channel of a water tunnel were performed on the basis of the multiblock computational technologies realized in the VP2/3 package. The vortex mechanism of intensifi cation of the heattransfer processes in this dimple was analyzed with special emphasis on the identifi cation of the vortex-jet structures self-generated in it.Keywords: separation fl ow, spherical dimple, plane-parallel channel, hydraulic losses, heat exchange, water tunnel, procedure of pressure correction, Rhie-Chow approach, multiblock computational technologies, VP2/3 package, visualization.Introduction. Identifi cation of the tornado-like vortex-jet structures self-generated in the separation fl ow over a single spherical dimple built in the wall of a channel continues to attract the attention of researchers to the present day [1-6]. The main reason for this interest is the need for a comprehensive knowledge of the vortex mechanism of intensifi cation of the heat exchange on surfaces with dimples. A pressing problem is also the verifi cation of the results of a corresponding computer imitation analysis. In this connection, a complex numerical and physical investigation on the visualization of a fl ow over a single spherical shallow dimple built in the lower wall of the rectangular-section plane-parallel channel of the water tunnel of the A. N. Krylov Central Scientifi c-Research Institute, performed by us with the use of the VP2/3 package developed at the St. Petersburg State University of Civil Aviation seems to be urgent.Genesis of the Problem. During more than 50 years the problem of the vortex intensifi cation of the heat exchange on surfaces with dimples has attracted the attention of scientists engaged in investigations related to thermal physics. The most important methodological aspect of this interesting problem is consideration of the mechanism of the indicated process by the example of the heat exchange in the neighborhood of a single spherical shallow dimple built in a plane wall. It is precisely this aspect that is the focus of attention for us in the present work. Therefore, we will briefl y review physical and numerical investigations on the convective heat exchange in the neighborhood of a single dimple. It makes sense to restrict our consideration to a spherical dimple because such dimples are most easy to manufacture. It should be noted that it is precisely these dimples for which the most complete results have been obtained.One of the fi rst signifi cant investigations on the fl ow over a single dimple in the form of a hemispherical cavity has been performed by R. Snideker and K. Donaldson in the 1960s and presented in the format of a two-page article [7], in which the transformation of the vortex structures formed within such a cavity as a result of the cyclic transfer of the tornadolike jets self-generated in it from one half of the cavity to its other half and backw...

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Section: Discussion Of the Resultssupporting

confidence: 66%

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confidence: 99%

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Visualization of a Flow in a Spherical Dimple Built in the Lower Wall of the Rectangular-Section Channel of a Water Tunnel and Numerical Identification of the Vortex-Jet Structures in It

Исаев

Guzeev

Сапожников

et al. 2015

J Eng Phys Thermophy

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“…In [51], the comparison of the results for convective heat transfer in the vicinity of a large-depth spherical dimple, which were numerically modeled using MCT and obtained on FLUENT adapted grids, shows that with the same accuracy FLUENT predictions require much more computational resources.…”

Section: Validationmentioning

confidence: 99%

Numerical simulation of the turbulent air flow in the narrow channel with a heated wall and a spherical dimple placed on it for vortex heat transfer enhancement depending on the dimple depth

Исаев

Щелчков

Leontiev

et al. 2016

International Journal of Heat and Mass Transfer

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Multi-objective optimization of a dimpled channel for heat transfer augmentation

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Simulating tornado-like enhancement of heat transfer for low-velocity motion of air in a rectangular channel with cavities. Part 1: Selection and justification of calculation methods

Cited by 11 publications

References 4 publications

Visualization of a Flow in a Spherical Dimple Built in the Lower Wall of the Rectangular-Section Channel of a Water Tunnel and Numerical Identification of the Vortex-Jet Structures in It

Visualization of a Flow in a Spherical Dimple Built in the Lower Wall of the Rectangular-Section Channel of a Water Tunnel and Numerical Identification of the Vortex-Jet Structures in It

Numerical simulation of the turbulent air flow in the narrow channel with a heated wall and a spherical dimple placed on it for vortex heat transfer enhancement depending on the dimple depth

Multi-objective optimization of a dimpled channel for heat transfer augmentation

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