Large-eddy-simulation of flow and heat transfer in a ribbed duct

Labbé, O.

doi:10.1016/j.compfluid.2013.01.023

Cited by 36 publications

(13 citation statements)

References 17 publications

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“…7(c). Similar explanations have been given by Labbe [45] to study the flow and heat transfer characteristics of a ribbed duct. At nozzle positions 1 and 3, the heat transfer rate is less as compared to that of the nozzle position 2 (i.e., Fig.…”

Section: Effect Of Nozzle Position On Nusselt Number (Trapezoidal Promentioning

confidence: 56%

Heat transfer enhancement from a small rectangular channel with different surface protrusions by a turbulent cross flow jet

Barik¹,

Mukherjee²,

Patro

2015

International Journal of Thermal Sciences

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Section: Effect Of Nozzle Position On Nusselt Number (Trapezoidal Promentioning

confidence: 56%

Heat transfer enhancement from a small rectangular channel with different surface protrusions by a turbulent cross flow jet

Barik¹,

Mukherjee²,

Patro

2015

International Journal of Thermal Sciences

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“…A comparison of the midpitch U/U b profiles between the fifth and sixth pitch gives a maximum difference of Fig. 6 Mean flow patterns in terms of velocity vectors in four selected pitches on Z * 5 0.5 plane of second pass as well as variation of the reattachment length with pitch index in the first and second pass [28,[35][36][37]: (a) mean flow patterns in terms of velocity vectors in four selected pitches of second pass, (b) portion enlarged view of (a), and (c) reattachment length versus pitch index [28,36,37] 10.5%, indicating the mean flow is not periodic in space in the first pass investigated.…”

Section: Resultsmentioning

confidence: 99%

Particle Image Velocimetry Measurements in a Two-Pass 90 Degree Ribbed-Wall Parallelogram Channel

Liou

Chang

Chan

et al. 2015

Journal of Turbomachinery

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A parallelogram channel has drawn very little or no attention in the open literature although it appears as a cross-sectional configuration of some gas turbine rotor blades. Particle image velocimetry (PIV) is presented of local flow structure in a two-pass 90 deg ribbed-wall parallelogram channel with a 180 deg sharp turn. The channel has a crosssectional equal length, 45.5 mm, of adjacent sides and two pairs of opposite angles are 45 deg and 135 deg. The rib height to channel height ratio is 0.1. All the measurements were performed at a fixed Reynolds number, characterized by channel hydraulic diameter of 32.17 mm and cross-sectional bulk mean velocity, of 10,000 and a null rotating number. Results are discussed in terms of the distributions of streamwise and secondary-flow mean velocity vector, turbulent intensity, Reynolds stress, and turbulent kinetic energy of the cooling air. It is found that the flow is not periodically fully developed in pitchwise direction through the inline 90 deg ribbed straight inlet and outlet leg. Pitchwise variation of reattachment length is revealed, and comparison with reported values in square channels is made. Whether the 180 deg sharp turn induced separation bubble exists in the ribbed parallelogram channel is also documented. Moreover, the measured secondary flow results inside the turn are successively used to explain previous heat transfer trends.

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“…They found the results to be quite insensitive to the SGS models. Labbe [92] conducted an LES study on transverse high blockage ribs at Re = 40,000 on developing flow with 5 ribs with a total of 38 million grid cells in the calculation domain using the Monotonic Integrated Large-Eddy Simulations (MILES) approach.…”

Section: Introductionmentioning

confidence: 99%

High Reynold Number LES of a Rotating Two-Pass Ribbed Duct

2018

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Cooling of gas turbine blades is critical to long term durability. Accurate prediction of blade metal temperature is a key component in the design of the cooling system. In this design space, spatial distribution of heat transfer coefficients plays a significant role. Large-Eddy Simulation (LES) has been shown to be a robust method for predicting heat transfer. Because of the high computational cost of LES as Reynolds number (Re) increases, most investigations have been performed at low Re of O(104). In this paper, a two-pass duct with a 180° turn is simulated at Re = 100,000 for a stationary and a rotating duct at Ro = 0.2 and Bo = 0.5. The predicted mean and turbulent statistics compare well with experiments in the highly turbulent flow. Rotation-induced secondary flows have a large effect on heat transfer in the first pass. In the second pass, high turbulence intensities exiting the bend dominate heat transfer. Turbulent intensities are highest with the inclusion of centrifugal buoyancy and increase heat transfer. Centrifugal buoyancy increases the duct averaged heat transfer by 10% over a stationary duct while also reducing friction by 10% due to centrifugal pumping.

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Large-eddy-simulation of flow and heat transfer in a ribbed duct

Cited by 36 publications

References 17 publications

Heat transfer enhancement from a small rectangular channel with different surface protrusions by a turbulent cross flow jet

Heat transfer enhancement from a small rectangular channel with different surface protrusions by a turbulent cross flow jet

Particle Image Velocimetry Measurements in a Two-Pass 90 Degree Ribbed-Wall Parallelogram Channel

High Reynold Number LES of a Rotating Two-Pass Ribbed Duct

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