Influence of the Reynolds number and the spherical dimple depth on turbulent heat transfer and hydraulic loss in a narrow channel

Исаев, С. А.; Kornev, Nikolaĭ; Leontiev, A. I.; Hassel, Egon

doi:10.1016/j.ijheatmasstransfer.2009.09.042

Cited by 105 publications

(72 citation statements)

References 17 publications

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“…3). That matched the observations [8] and also simulations [1,2]. This change of the flow character is obvious, when streamlines in simulations that use tetra-prismatic mesh, as shown in Fig.…”

Section: Results Of Testing and Analysissupporting

confidence: 82%

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CFD simulation of dimpled sphere and its wind tunnel verification

Spalensky

Rozehnal

2017

MATEC Web Conf.

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Abstract.Paper deals with problems of CFD simulating airflow over a dimpled spherical surface and its verification by the wind tunnel measurement. The low-cost simulation approach was applied to be run on a common PC using the commercial software ANSYS CFX. The wind tunnel testing has been performed in the laboratory of aerodynamics at the Department of Air Force and Aircraft Technology of the University of Defence. Measured results of the drag coefficient versus the Reynolds number for smooth and dimpled spheres were compared and discussed. Presented simulation corresponds adequately to the experimental results. It can be stated that the CFD simulation is suitable for simulating the flow over the dimpled surfaces similar to sphere.

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Section: Results Of Testing and Analysissupporting

confidence: 82%

“…There is a large potential in using of dimpled surfaces for the aerodynamic drag reduction of various objects, where the laminar-turbulent transition is inducted [1,2]. Nowadays, the research of dimple's aerodynamics is also focused on the study of increasing the heat transfer rate [3,4].…”

Section: Introductionmentioning

confidence: 99%

CFD simulation of dimpled sphere and its wind tunnel verification

Spalensky

Rozehnal

2017

MATEC Web Conf.

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“…For an understanding of the overall flowing structure in the channel, they used the Fluent software. Isaev et al (2010) dealt with a detailed numerical study of heat transfer enhancement by a spherical dimple placed on a wall in a narrow channel. The research was aimed at influence of the depth to diameter ratio and the Reynolds number on the flow and heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Intensification of heat transfer between heat exchange surfaces at low RE values

Černecký¹,

Brodnianská²,

Koniar³

2015

Chemical and Process Engineering

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This contribution deals with the heat transfer parameters and pressure losses in heat exchange sets with six geometrical arrangements at low Re values (Re from 476 to 2926). Geometrical arrangements were characterised by the h/H ratio ranging from 0.2 to 1.0. The experiments used the holographic interferometry method in real time. This method enables visible and quantitative evaluations of images of temperature fields in the examined heat exchange. These images are used to determine the local and mean heat transfer parameters. The obtained data were used to determine the Colburn j-factor and the friction coefficient f. The measured values show that by using the profiled heat exchange surfaces and inserting regulating tubes, an intensification of heat transfer (increase of Nu m , and/or j) was achieved. However, pressure losses recorded a significant increase (increase of f).

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“…However, flow mixing was higher for the double wall than that of the single wall, which resulted in enhanced heat transfer. Isaev et al [12] numerically studied heat transfer enhancement by a spherical dimple placed on a wall in a narrow channel. The effect of rectangle dimples on the friction of parallel surface at different sliding conditions was 2 Advances in Mechanical Engineering introduced by Meng et al [13].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on the Effect of Tube Rows on the Heat Transfer Characteristic of Dimpled Fin

Feng

Liu

et al. 2014

Advances in Mechanical Engineering

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The dimpled fin has excellent heat transfer performance and has attracted a lot of attention to apply on the fin and tube heat exchanger. A study presents to investigate the effects of number of tube rows on the air-side heat transfer characteristics of dimpled fin for velocity ranging from 1 to 3 m/s. The /Δ and /((Δ × )) are used to evaluate the heat transfer performance of the heat exchanger. The results show that the dimpled arrangement can change the mainstream direction, increase the disturbance, and enhance the heat transfer. With the increase of the number of tube rows, the average Nusselt number decreases and /Δ and /((Δ × )) increase gradually. Compared with the multipipe tube rows, the performance of two-row tube is better.

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Influence of the Reynolds number and the spherical dimple depth on turbulent heat transfer and hydraulic loss in a narrow channel

Cited by 105 publications

References 17 publications

CFD simulation of dimpled sphere and its wind tunnel verification

CFD simulation of dimpled sphere and its wind tunnel verification

Intensification of heat transfer between heat exchange surfaces at low RE values

Numerical Study on the Effect of Tube Rows on the Heat Transfer Characteristic of Dimpled Fin

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