Detailed measurement of heat/mass transfer and pressure drop in a rotating two-pass duct with transverse ribs

Kim, Kyung Min; Lee, Dong Hoon; Cho, Hyung Hee

doi:10.1007/s00231-006-0161-3

Cited by 15 publications

(2 citation statements)

References 27 publications

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“…Investigations which employ naphthalene sublimation to determine mass transfer generally obtain results which are consistent with heat transfer experiments [216,[238][239][240][241][242][243][244][245][246][247]. However, one drawback of such mass transfer methods is the absence of buoyancy within experiments.…”

Section: Effects Of Rotation On Local Nusselt Numbers Spatiallymentioning

confidence: 68%

Heat Transfer Augmentation Technologies for Internal Cooling of Turbine Components of Gas Turbine Engines

Ligrani

2013

International Journal of Rotating Machinery

183

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To provide an overview of the current state of the art of heat transfer augmentation schemes employed for internal cooling of turbine blades and components, results from an extensive literature review are presented with data from internal cooling channels, both with and without rotation. According to this survey, a very small number of existing investigations consider the use of combination devices for internal passage heat transfer augmentation. Examples are rib turbulators, pin fins, and dimples together, a combination of pin fins and dimples, and rib turbulators and pin fins in combination. The results of such studies are compared with data obtained prior to 2003 without rotation influences. Those data are comprised of heat transfer augmentation results for internal cooling channels, with rib turbulators, pin fins, dimpled surfaces, surfaces with protrusions, swirl chambers, or surface roughness. This comparison reveals that all of the new data, obtained since 2003, collect within the distribution of globally averaged data obtained from investigations conducted prior to 2003 (without rotation influences). The same conclusion in regard to data distributions is also reached in regard to globally averaged thermal performance parameters as they vary with friction factor ratio. These comparisons, made on the basis of such judgment criteria, lead to the conclusion that improvements in our ability to provide better spatially-averaged thermal protection have been minimal since 2003. When rotation is present, existing investigations provide little evidence of overall increases or decreases in overall thermal performance characteristics with rotation, at any value of rotation number, buoyancy parameter, density ratio, or Reynolds number. Comparisons between existing rotating channel experimental data and the results obtained prior to 2003, without rotation influences, also show that rotation has little effect on overall spatially-averaged thermal performance as a function of friction factor.

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Section: Effects Of Rotation On Local Nusselt Numbers Spatiallymentioning

confidence: 68%

Heat Transfer Augmentation Technologies for Internal Cooling of Turbine Components of Gas Turbine Engines

Ligrani

2013

International Journal of Rotating Machinery

183

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“…Implementing artificial rib surfaces, such as ribs, grooves, etc in the absorber plate of the SAH can produce an enhancement of the heat transfer rate. Saha et al [1] and Kim et al [2] conducted an experimental study on a rectangular duct with ribbed walls to investigate the heat transfer and friction characteristics of artificial rib turbulators [1] and perforated ribs [2]. The results showed that using perforated ribs and turbulators increased heat transfer by 18% and pressure drop by 12% in comparison with the smooth surface.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Thermo-Hydraulic Performances of Artificial Ribs Mounted in a Rectangular Duct

et al. 2023

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This research investigates the fluid flow characterization and thermohydraulic performances (THP) of rib surfaces, using computational and experimental methods. ANSYS computational fluid dynamics (CFD) software was used to predict and validate the findings in the experimental setup. Artificial rib surfaces, including polygonal and forward trapezoidal-shaped ribs, were placed in the absorber plate at different relative pitch distances (p/e) = 6.7, 10, 13.4 and relative height (e/d) = 20, and the mass flow rate of air (working fluid) varied at Reynolds numbers ranging from 2000 to 20,000. According to the validation results, the RNG renormalization k-ε model was selected for the investigation. The results show that strong turbulence occured closer to the wall surface and behind the rib surface, enhancing thermal performances due to the sharp edge shape of the rib. A polygonal rib with a pitch distance of p/e = 6.7 achieved a higher Nusselt number (Nu) and thermohydraulic performance of 2.95 at Re 4000. An empirical correlation between the Nusselt number (Nu) and friction factor (f) was developed using linear regression analysis and was compared with the predicted values. The comparison results show a close range of ±8% between the experimental and predicted values.

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Heat (mass) transfer and friction loss in two-pass ducts with various parallel rib arrangements

Kim

Lee

et al. 2008

Heat Mass Transfer

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Detailed measurement of heat/mass transfer and pressure drop in a rotating two-pass duct with transverse ribs

Cited by 15 publications

References 27 publications

Heat Transfer Augmentation Technologies for Internal Cooling of Turbine Components of Gas Turbine Engines

Heat Transfer Augmentation Technologies for Internal Cooling of Turbine Components of Gas Turbine Engines

Investigation of Thermo-Hydraulic Performances of Artificial Ribs Mounted in a Rectangular Duct

Heat (mass) transfer and friction loss in two-pass ducts with various parallel rib arrangements

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