Large Eddy Simulation of Turbulent Flow and Heat Transfer in a Ribbed Coolant Passage

Ramgadia, Abhishek G.; Saha, A.

doi:10.1155/2012/246313

Cited by 8 publications

(3 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The heat flux is strongly dependent on the flow pattern, and the flow patterns are dependent on several channel design variables. Most of the study has focused on improving heat transfer rates by altering the architecture of channels and flow patterns (Gong et al, 2011;Mellal et al, 2017;Ramgadia & Saha, 2012). As a result, the enhanced fluid mixing propensity in wavy channels makes them a viable alternative to conventional channels (i.e., flat channels) for improving heat exchanger thermal performance.…”

Section: Introductionmentioning

confidence: 99%

Effects of Asymmetric Channel on the Convective Heat Transfer: A Computational Study

Hamja¹,

Hossain²,

Shubho³

et al. 2023

Energy Thermofluids Eng.

View full text Add to dashboard Cite

In the fields of engineering, especially in the heat transfer area, the contribution of the fluid flows through different channels is remarkable. Among the different available shapes in the channel, the sinusoidal wavy channels are considered more efficient in the heat transfer areas such as cooling of electronic devices, boilers, biomedical applications, etc., due to their increased recirculation capability of mixing the flowing fluids - which increases the heat transfer performance, consequently. The optimization of channel design and modelling has been an engineering problem in recent years. In this research, flat, symmetric sinusoidal, and asymmetric sinusoidal channels were designed - using ANSYS 2020 - to investigate the effects of channel shape, amplitude, and aspect ratio of sinusoidal wavy walls on the overall heat transfer performance. Several designs have been considered in the present study at different Reynolds numbers and different aspect ratios, keeping the wall temperature as constant. The results of this study exhibit that at an aspect ratio of 0.4, the asymmetric channel shows the highest heat transfer effect due to increased recirculation tendency.

show abstract

Section: Introductionmentioning

confidence: 99%

Effects of Asymmetric Channel on the Convective Heat Transfer: A Computational Study

Hamja¹,

Hossain²,

Shubho³

et al. 2023

Energy Thermofluids Eng.

View full text Add to dashboard Cite

show abstract

“…It did not however capture shear layer transition accurately, predicting a development length around two rib pitches greater than the LES. Ramgadia and Saha [9] use LES to study a periodically repeating ribbed duct section. A shearimproved Smagorinsky model is used, with LES data agreeing with measurements.…”

Section: Introductionmentioning

confidence: 99%

Large eddy simulation of turbine internal cooling ducts

Tyacke

Tucker

2015

Computers & Fluids

View full text Add to dashboard Cite

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.

show abstract

“…It did not however capture shear layer transition accurately, predicting a development length around two rib pitches greater than the LES. Ramgadia and Saha [9] use LES to study a periodically repeating ribbed duct section. A shear-improved Smagorinsky model is used, with LES data agreeing with measurements.…”

mentioning

confidence: 99%

Large Eddy Simulation of Turbine Internal Cooling Ducts

Tyacke

Tucker

2013

Volume 8B: Heat Transfer and Thermal Engineering

View full text Add to dashboard Cite

Large-Eddy Simulation and hybrid RANS-LES methods are applied to a turbine blade ribbed internal duct with a 180 degree 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. 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.

show abstract

Large Eddy Simulation of Turbulent Flow and Heat Transfer in a Ribbed Coolant Passage

Cited by 8 publications

References 36 publications

Effects of Asymmetric Channel on the Convective Heat Transfer: A Computational Study

Effects of Asymmetric Channel on the Convective Heat Transfer: A Computational Study

Large eddy simulation of turbine internal cooling ducts

Large Eddy Simulation of Turbine Internal Cooling Ducts

Contact Info

Product

Resources

About