Heat Transfer in Triangular Channels With Angled Roughness Ribs on Two Walls

Metzger, D. E.; Vedula, Rajendra P.

doi:10.1080/08916158708946329

Cited by 51 publications

(17 citation statements)

References 4 publications

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“…All the abovementioned studies are for turbine blade cooling channels with two opposite ribbed walls. Heat transfer enhancement in triangular ducts with rib turbulators has also been investigated (Metzger and Vedula, 1987;Zhang et al, 1994). Experiments with one ribbed-wall channel have also been reported (Liou and Hwang, 1992;Acharya et al, 1993).…”

Section: Introductionmentioning

confidence: 96%

Turbulent Flow Heat Transfer and Friction in a Rectangular Channel With Varying Numbers of Ribbed Walls

Chandra

Niland

Han

1997

Journal of Turbomachinery

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An experimental study of wall heat transfer and friction characteristics of a fully developed turbulent air flow in a rectangular channel with transverse ribs on one, two, and four walls is reported. Tests were performed for Reynolds numbers ranging from 10,000 to 80,000. The pitch-to-rib height ratio, P/e, was kept at 8 and rib height-to-channel hydraulic diameter ratio, e/D h , was kept at 0.0625. The channel length-to-hydraulic diameter ratio, L/D h , was 15. The heat transfer coefficient and friction factor values were enhanced with the increase in the number of ribbed walls. The friction roughness function, R(e + ), was almost constant over the entire range of tests performed and was within comparable limits of the previously published data. The heat transfer roughness function, G(e + ), decreased with additional ribbed walls and compared well with previous work in this area. Friction data obtained experimentally for the case with four ribbed walls compared well with the values predicted by the assumed theoretical relationship used in the present study and past publications. Results of this investigation could be used in various applications of internal channel turbulent flows involving different numbers of roughened walls.

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Section: Introductionmentioning

confidence: 96%

Turbulent Flow Heat Transfer and Friction in a Rectangular Channel With Varying Numbers of Ribbed Walls

Chandra

Niland

Han

1997

Journal of Turbomachinery

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“…Metzger et al [7], Metzger and Vedula [8] and also Zhang et al [9] investigated the heat transfer enhancement in a ribbed triangular duct. Haasenritter and Weigand [10] numerically predicted the heat transfer enhancement in a ribbed triangular duct by using a k-ε turbulence model.…”

Section: Introductionmentioning

confidence: 99%

An experimental investigation of the heat transfer in a ribbed triangular cooling channel

Amro

Weigand

Poser

et al. 2007

International Journal of Thermal Sciences

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“…The results indicate that the existence of solid ribs would enhance the convective heat transfer greatly, especially for a fluid with high Prandtl number. Besides a rectangular channel, ribbed channels with circular cross-section [5], triangular cross-section [6], and fan-shaped cross-section [7] were also studied. Because of the high pressure drop caused by impermeable solid ribs, the applications of ribs with perforations that allow the flow through the ribs are attracting increasing attention.…”

Section: Introductionmentioning

confidence: 99%

Investigations of Heat Transfer Enhancement in a Channel with Staggered Porous Ribs by the Preconditioned Density-Based Algorithm

Zhang

Zou

Shao

et al. 2015

Numerical Heat Transfer, Part A: Applications

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The preconditioned density-based algorithm and two-domain approach were used to investigate the fluid flow and heat transfer characteristics in a channel with staggered porous/solid ribs. In the porous zone, the momentum equations were formulated by the Darcy-BrinkmanForchheimer model; and the local thermal equilibrium (LTE) model was adopted for energy equation. At the porous/fluid interface, the stress-continuity interfacial condition was utilized. The governing equations are solved by the preconditioned density-based control-volume method, with preconditioning matrix for equations of porous domain adopted, aiming to eliminate the equation stiffness of the porous seepage flow. The effects of Reynolds number, geometry parameters of ribs (rib length and thickness), and physical property of porous media (permeability and porosity) on the flow pattern and heat transfer performance were analyzed. Results indicate that, compared with that of solid ribs, the recirculating bubble behind the porous ribs is completely detached from it because of the permeability of porous media, and the size of the recirculating bubble is suppressed. The parameters that would affect the mass flow of fluid penetrating the porous ribs, including permeability, Reynolds number, baffle length and thickness, have remarkable influence on the flow pattern. All the aforementioned parameters would affect the local heat transfer performance.

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Heat Transfer in Triangular Channels With Angled Roughness Ribs on Two Walls

Cited by 51 publications

References 4 publications

Turbulent Flow Heat Transfer and Friction in a Rectangular Channel With Varying Numbers of Ribbed Walls

Turbulent Flow Heat Transfer and Friction in a Rectangular Channel With Varying Numbers of Ribbed Walls

An experimental investigation of the heat transfer in a ribbed triangular cooling channel

Investigations of Heat Transfer Enhancement in a Channel with Staggered Porous Ribs by the Preconditioned Density-Based Algorithm

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