The Effect of Periodic Ribs on the Local Aerodynamic and Heat Transfer Performance of a Straight Cooling Channel

Rau, Guido; C¸akan, M.; Moeller, Detlev; Arts, Tony

doi:10.1115/1.2841415

Cited by 195 publications

(90 citation statements)

References 15 publications

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“…There is a good agreement between measured and calculated recirculation lengths. The recirculation lengths predicted by the EVM and NLEVM2 are about 4.5 and 4.8 times the rib height, respectively, which are close to the measured value of 4.3 times of the rib height reported by Rau et al (1998). Mean flow predictions for the ribbed channel at Re ¼ 122; 400 indicated that increasing Reynolds number has insignificant effects on the flow features.…”

Section: Resultssupporting

confidence: 81%

Application of a non‐linear k‐ε model in prediction of convective heat transfer through ribbed passages

Raisee

Noursadeghi²,

Iacovides³

2004

International Journal of Numerical Methods for Heat &Amp; Fluid Flow

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If you would like to write for this, or any other Emerald publication, then please use our Emerald for Authors service information about how to choose which publication to write for and submission guidelines are available for all. Please visit www.emeraldinsight.com/authors for more information. About Emerald www.emeraldinsight.comEmerald is a global publisher linking research and practice to the benefit of society. The company manages a portfolio of more than 290 journals and over 2,350 books and book series volumes, as well as providing an extensive range of online products and additional customer resources and services.Emerald is both COUNTER 4 and TRANSFER compliant. The organization is a partner of the Committee on Publication Ethics (COPE) and also works with Portico and the LOCKSS initiative for digital archive preservation.Abstract A numerical investigation has been undertaken to study fluid flow and heat transfer through artificially rib-roughened channels. Such flows are of particular interest in internal cooling of advanced gas turbine blades. The main objective is to test the suitability of recently developed variants of the cubic non-linear k-1 model for the prediction of cooling flows through ribbed passages. The numerical approach used in this study is the finite-volume method together with the SIMPLE algorithm. For the modelling of turbulence, the Launder and Sharma low-Re k-1 model and a new version of the non-linear low-Re two equation model that have been recently shown to produce reliable thermal predictions in impinging jet flows and also flows through pipe expansions, have been employed. Both models have been used with the form of the length-scale correction term to the dissipation rate originally proposed by Yap and also more recently developed differential version, NYap. The numerical results over a range of flow parameters have been compared with the reported experimental data. The mean flow predictions show that both linear and non-linear k-1 models with NYap can successfully reproduce the distribution of the measured streamwise velocity component, including the length and width of the separation bubble, formed downstream of each rib. As far as heat transfer predictions are concerned, the recent variant of the non-linear k-1 leads to marked improvements in comparison to the original version of Craft et al. Further improvements in the thermal prediction result through the introduction of a differential form of the turbulent length scale correction term to the dissipation rate equation. The version of the non-linear k-1 that has been shown in earlier studies to improve thermal predictions in pipe expansions and impinging jets; it is thus found to also produce reasonable heat transfer predictions in ribbed passages.

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Section: Resultssupporting

confidence: 81%

Application of a non‐linear k‐ε model in prediction of convective heat transfer through ribbed passages

Raisee

Noursadeghi²,

Iacovides³

2004

International Journal of Numerical Methods for Heat &Amp; Fluid Flow

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“…The quantity Nu=Nu 0 indicates the heat transfer enhancement compared to that of flow over a flat plate. For all models, agreement with the measurements of [33,6] is observed. At each end of Fig.…”

Section: Heat Transfersupporting

confidence: 83%

“…The geometry of [33] is comparable (h=D ¼ 0:1 and D=h ¼ 9) with the current study (h=D ¼ 0:1 and D=h ¼ 10). The additional Re ¼ 30; 000 data of [6] provides a comparison between the different experimental facilities.…”

Section: Modelsupporting

confidence: 58%

“…Yoshizawa -Leray C L qa 2 u i;k u k;j þ u i;k u j;k Â Ã a Caqa 2 u i;k u k;j þ u i;k u j;k À u k;i u k;j Â Ã Kosović C K qa 2 u i;k u k;j þ 3u i;k u j;k À u k;i u k;j Â Ã predict, comparison is also made with the Re ¼ 30; 000 data of [33,6]. The geometry of [33] is comparable (h=D ¼ 0:1 and D=h ¼ 9) with the current study (h=D ¼ 0:1 and D=h ¼ 10).…”

Section: Modelmentioning

confidence: 99%

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Large eddy simulation of turbine internal cooling ducts

Tyacke

Tucker

2015

Computers & Fluids

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a b s t r a c tLarge-Eddy Simulation (LES) and hybrid Reynolds-averaged Navier-Stokes-LES (RANS-LES) methods are applied to a turbine blade ribbed internal duct with a 180°bend containing 24 pairs of ribs. Flow and heat transfer predictions are compared with experimental data and found to be in agreement. The choice of LES model is found to be of minor importance as the flow is dominated by large geometric scale structures. This is in contrast to several linear and nonlinear RANS models, which display turbulence model sensitivity. For LES, the influence of inlet turbulence is also tested and has a minor impact due to the strong turbulence generated by the ribs. Large scale turbulent motions destroy any classical boundary layer reducing near wall grid requirements. The wake-type flow structure makes this and similar flows nearly Reynolds number independent, allowing a range of flows to be studied at similar cost. Hence LES is a relatively cheap method for obtaining accurate heat transfer predictions in these types of flows.

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“…They concluded that a pitchto-height ratio of 8.5 consistently produced the highest rib average heat transfer coefficients. Rau et al [7] used a liquid-crystal technique to measure the local heat transfer distribution in a square duct. They performed flowfield measurements by using a two-dimensional laser Doppler velocimetry system and showed that the boundary-layer separation and reattachment contributed to the heat transfer enhancement in the ribbed channel.…”

mentioning

confidence: 99%

Heat Transfer and Friction in a Square Channel with Ribs and Grooves

Liu

et al. 2016

Journal of Thermophysics and Heat Transfer

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Turbulence promoters have been widely applied to enhance heat transfer in internal flow channels, although they cause pressure loss. This study employed the transient liquid-crystal technique to measure the heat transfer distribution in a square channel with compound turbulence promoters with orthogonal (90 deg), continuous angled (45 deg), discrete angled (45 deg), V-shaped, and inverted-V-shaped rib configurations. The rib height-to-hydraulic diameter ratio (e∕D h ) and the rib pitch-to-height ratio (P∕e) were 0.1 and 8, respectively. Variations in the Nusselt number were observed after adding grooves between the ribs. The Reynolds number tested in this study ranged from 15,000 to 35,000. Adding grooves between the ribs enhanced the heat transfer. The convective heat transfer coefficient increased by up to 40%, whereas the friction factor ratio increased by less than 30%. The discrete angled configuration of grooved ribs exhibited the maximal heat transfer enhancement and thermal performance, whereas the orthogonal configuration attained the minimal heat transfer enhancement and thermal performance. The frictional loss of the V-shaped and inverted-V-shaped configurations was higher than that of the continuous or discrete arrangements for both ribs-only and ribbed-grooved configurations.

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The Effect of Periodic Ribs on the Local Aerodynamic and Heat Transfer Performance of a Straight Cooling Channel

Cited by 195 publications

References 15 publications

Application of a non‐linear k‐ε model in prediction of convective heat transfer through ribbed passages

Application of a non‐linear k‐ε model in prediction of convective heat transfer through ribbed passages

Large eddy simulation of turbine internal cooling ducts

Heat Transfer and Friction in a Square Channel with Ribs and Grooves

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