Experimental and numerical study of developed flow and heat transfer in coolant channels with 45 degree ribs

Bonhoff, B.; Parneix, S.; Leusch, J.; Johnson, B. V.; Schabacker, J.; Bölcs, A.

doi:10.1016/s0142-727x(99)00011-9

Cited by 85 publications

(43 citation statements)

References 24 publications

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“…Further downstream an approximately identical distribution occurs at x/D h = 6.6 and x/D h = 10.6. Although the results of the flow measurements in the upstream leg (Bonhoff et al 1998) were not presented in this paper, the peak value of approximately k/U b 2 = 0.065 at x/D h = 10.6 is about 40 percent higher than the corresponding value in the upstream leg. This indicates that the flow has not yet completely recovered from the bend effects.…”

Section: Flow In the Downstream Legmentioning

confidence: 76%

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PIV Investigation of the Flow Characteristics in an Internal Coolant Passage With 45deg Rib Arrangement

Schabacker

Boelcs

Johnson

1999

Volume 3: Heat Transfer; Electric Power; Industrial and Cogeneration

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Section: Flow In the Downstream Legmentioning

confidence: 76%

“…The development of the velocity components in the upstream leg of the coolant passage was presented by Bonhoff et al (1998) and will therefore not be shown in this paper. However, for reasons of completeness, a short discussion of the flow development in the upstream leg should be included in this paper.…”

Section: Flow In the Upstream Legmentioning

confidence: 99%

PIV Investigation of the Flow Characteristics in an Internal Coolant Passage With 45deg Rib Arrangement

Schabacker

Boelcs

Johnson

1999

Volume 3: Heat Transfer; Electric Power; Industrial and Cogeneration

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“…As noted by [9], the streamwise velocity profiles have two peaks at values of Y approximately equal 0.2 and 0.8. These are attributed to the acceleration of the flow as it crosses the ribs at 0.1 Y = and 0.9 for the top and bottom walls, respectively.…”

Section: Flow In the Upstream Legmentioning

confidence: 77%

“…A comparison of velocity components in the developed flow region of a similar coolant passage was presented by [9]. The measurements showed that the flow with a 45-deg rib arrangement differs from the flow in a similar passage with a 90-deg rib arrangement [10].…”

Section: Flow In the Upstream Legmentioning

confidence: 99%

Particle image velocimetry investigation of the flow characteristics in two-leg internal coolant passages of gas turbine airfoils

Chanteloup

Bölcs

2001

Proceedings of the Institution of Mechanical Engineers, Part A:

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A study of flow in a stationary model of a two-pass internal coolant passage is presented which focuses on the flow characteristics in the 180-deg bend region and downstream of the bend, where the flow is redeveloping. A stereoscopic digital PIV system measured all three velocity-components simultaneously to obtain mean-velocity and turbulence quantities of the flow field. The coolant passage model consisted of two square passages, each having a 20 hydraulic diameter length, separated by a web of 0.2 passage widths and connected by a sharp 180 deg bend with a rectangular outer wall. Ribs were mounted on the bottom and top walls of both legs with a staggered arrangement and at 45 deg to the flow. The rib height and spacing were 0.1 and 1.0 passage heights, respectively. The measurements were obtained for a flow condition with a Reynolds number of 50,000. The geometry is similar in the straight sections to a previous configuration but has ribs extending into the bend region. The paper presents new measurements of the flow in the straight legs of the passage, comparison of the flow in the bend region with a previous configuration and details of the flow recovery from the bend in the second leg.

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“…The 85 results indicated that RSM with wall functions showed relatively favorable results compared to other CFD simulations. Details of the experimental and computational setup are further discussed in Bonhoff et al [37].…”

Section: Literature Reviewmentioning

confidence: 99%

Wall modeled Large-Eddy Simulations in rotating systems for applications to turbine blade internal cooling

Song

Tafti

2012

Int J Adv Eng Sci Appl Math

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Large-Eddy Simulations (LES or wall-resolved LES, WRLES) has been used extensively in capturing the physics of anisotropic turbulent flows. However, near wall turbulent scales in the inner layer in wall bounded flows makes it unfeasible for large Reynolds numbers due to grid requirements. This study evaluates the use of a wall model for LES (WMLES) on a channel with rotation at = 34,000 from = 0 to 0.38, non-staggered 90 ribbed duct with rotation at = 20,000 from = 0 to 0.70, stationary 45 staggered ribbed duct at = 49,000, and two-pass smooth duct with a Ubend at = 25,000 for = 0 to 0.238 against WRLES and experimental data. In addition, for the two-pass smooth duct with a U-bend simulations, the synthetic eddy method (SEM) is used to artificially generate eddies at the inlet based on given flow characteristics.It is presented that WMLES captures the effects of Coriolis forces and predicts mean heat transfer augmentation ratios reasonably well for all simulations. The alleviated grid resolution for these simulations indicates significant reductions in resources, specifically, by a factor of 10-20 in non-staggered 90 ribbed duct simulations. The combined effects of density ratio, Coriolis forces, with SEM for the inlet turbulence, capture the general trends in heat transfer in and after the bend.iii Dedicated to my family (Dea Han Song, Gue Hee Song, and Keun Hyung (Brian) Song) iv

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Experimental and numerical study of developed flow and heat transfer in coolant channels with 45 degree ribs

Cited by 85 publications

References 24 publications

PIV Investigation of the Flow Characteristics in an Internal Coolant Passage With 45deg Rib Arrangement

PIV Investigation of the Flow Characteristics in an Internal Coolant Passage With 45deg Rib Arrangement

Particle image velocimetry investigation of the flow characteristics in two-leg internal coolant passages of gas turbine airfoils

Wall modeled Large-Eddy Simulations in rotating systems for applications to turbine blade internal cooling

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