Periodically developed flow and heat transfer in a ribbed duct

Acharya, Sumanta; Dutta, S.; Myrum, T. A.; Baker, R. S.

doi:10.1016/s0017-9310(05)80138-3

Cited by 107 publications

(36 citation statements)

References 21 publications

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“…5.11. Comparison is made with the heat transfer measurements of Acharya et al (1993) for a biperiodic channel flow case. The scatter in the Frame (a) RANS results is substantial.…”

Section: Ribbed Passagesmentioning

confidence: 99%

Applications of Eddy Resolving Methods

Tucker

2014

Unsteady Computational Fluid Dynamics in Aeronautics

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“…5.11. Comparison is made with the heat transfer measurements of Acharya et al (1993) for a biperiodic channel flow case. The scatter in the Frame (a) RANS results is substantial.…”

Section: Ribbed Passagesmentioning

confidence: 99%

Applications of Eddy Resolving Methods

Tucker

2014

Unsteady Computational Fluid Dynamics in Aeronautics

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“…In all cases, encouraging agreement was found between measurements and established data. For the ribbed channel studies, the measurements of Acharya et al [32] were compared, this having a relatively low Reynolds number (Re = 14 200 based on the channel height) relevant to electronics. Discussion of these cases can be found in [13,33].…”

Section: Validation Casesmentioning

confidence: 99%

Contrasting zonal LES and non‐linear zonal URANS models when predicting a complex electronics system flow

Liu

Tucker

2006

Numerical Meth Engineering

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SUMMARYZonal non-linear URANS (unsteady Reynolds-averaged Navier-Stokes) and hybrid RANS/LES (large eddy simulation) model variants are presented. Performances of these models are compared for an unsteady, relatively high Reynolds number, complex electronics-related geometry, non-isothermal flow.Comparison is made with heat transfer, velocity and turbulence intensity data. The URANS models investigated involve zonal k-l/EASM (explicit algebraic stress model) and k-l/HCubic (high Reynolds number cubic model) variants. A k-l-based hybrid RANS/LES (zonal LES) method is also applied and four RANS-LES switching criteria considered. Results are found to be relatively insensitive to this. To aid comparisons, the Smagorinsky, Yoshizawa, non-linear Kosovic and mixed Leray subgrid scale LES models are considered. All models give similar mean velocity predictions. However, for turbulence intensities, the hybrid RANS/LES and LES give considerably more accurate predictions than the URANS. For heat transfer, none of the models performs well. The local Nusselt number is largely overpredicted by the URANS and underpredicted by the hybrid RANS/LES. However, the worst hybrid RANS/LES model Nusselt number error is around 30% less than the best URANS model error. Also, the most accurate URANS heat transfer is for the crudest model. On average, the hybrid RANS/LES model heat transfer results are marginally more accurate than the LES.

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“…Some researchers used a straight duct to investigate the effect of roughness elements (ribs) on both flow and heat transfer fields. Acharya et al [1] used the nonlinear and standard k- turbulence models and the nonlinear model was found to predict more realistic Reynolds stresses in the core flow region immediately above the ribs than the standard k- model. Liou et al [2] performed calculations with the k--A PDM turbulence model together with a smoothed hybrid central/skew upstream difference scheme (SCSUDS) and the PISO pressure-velocity coupling algorithm was applied to solve the accelerated, separated and recirculating flows.…”

Section: Introductionmentioning

confidence: 99%

On numerical simulations of flow and heat transfer of the bend part of a U-duct

Salameh

Sundén

2010

Advanced Computational Methods and Experiments in Heat Transfer XI

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Two dimensional numerical simulations of the flow and temperature fields inside the bend (turn) part of a U duct have been performed. Both the standard and low Reynolds number k- models were used to solve the smooth bend (turn) part and ribbed bend (turn) part, respectively. For the standard k- model, the wall function approach was used at the near wall region where the log-law was assumed to be valid, whereas the modelling damping functions were used in the low Reynolds number model. In the case of the ribbed bend (turn) part, two approaches were used, the total approach and an approach based on periodic flow condition. The details of the duct geometry were as follows: the cross section area of the straight part is 5050 mm 2 , the inside length of the bend part 240 mm, the cross section area of the rib is 55 mm 2 and the rib height-tohydraulic diameter ratio, e/Dh, is 0.1. The results are compared with experimental data obtained for the same conditions.

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Periodically developed flow and heat transfer in a ribbed duct

Cited by 107 publications

References 21 publications

Applications of Eddy Resolving Methods

Applications of Eddy Resolving Methods

Contrasting zonal LES and non‐linear zonal URANS models when predicting a complex electronics system flow

On numerical simulations of flow and heat transfer of the bend part of a U-duct

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