LES of an Asymmetrically Heated High Aspect Ratio Duct at High Reynolds Number at Different Wall Temperatures

Kaller, Thomas; Hickel, Stefan; Adams, Nikolaus A.

doi:10.2514/6.2018-4287

Cited by 3 publications

(1 citation statement)

References 24 publications

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“…In the first part of the present study an asymmetrically heated high aspect ratio cooling duct (HARCD) at Re b = 110 • 10 3 and a moderate heating of T W − T b = 40 K is investigated using the BSL RSM and various turbulent heat flux closure models with ANSYS CFX. This setup has been studied experimentally, [28], and using a LES, [16][17][18][19] serving as comparison database. In the second part a cryogenic transcritical channel at Re b = 16 • 10 3 is investigated with the BSL RSM and various turbulent heat flux closure models with ANSYS FLUENT.…”

Section: Introductionmentioning

confidence: 99%

Assessment of RANS Turbulence Models for Straight Cooling Ducts: Secondary Flow and Strong Property Variation Effects

Kaller

Doehring

Hickel

et al. 2020

Notes on Numerical Fluid Mechanics and Multidisciplinary Design

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We present well-resolved RANS simulations of two generic asymmetrically heated cooling channel configurations, a high aspect ratio cooling duct operated with liquid water at $$Re_b = 110 \times 10^3$$ and a cryogenic transcritical channel operated with methane at $$Re_b = 16 \times 10^3$$. The former setup serves to investigate the interaction of turbulence-induced secondary flow and heat transfer, and the latter to investigate the influence of strong non-linear thermodynamic property variations in the vicinity of the critical point on the flow field and heat transfer. To assess the accuracy of the RANS simulations for both setups, well-resolved implicit LES simulations using the adaptive local deconvolution method as subgrid-scale turbulence model serve as comparison databases. The investigation focuses on the prediction capabilities of RANS turbulence models for the flow as well as the temperature field and turbulent heat transfer with a special focus on the turbulent heat flux closure influence.

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Section: Introductionmentioning

confidence: 99%

Assessment of RANS Turbulence Models for Straight Cooling Ducts: Secondary Flow and Strong Property Variation Effects

Kaller

Doehring

Hickel

et al. 2020

Notes on Numerical Fluid Mechanics and Multidisciplinary Design

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Prediction Capability of RANS Turbulence Models for Asymmetrically Heated High-Aspect-Ratio Duct Flows

Kaller

Hickel

Adams

2020

AIAA Scitech 2020 Forum

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Assessment of the Heat Transfer Conditions in the Cavity of a Rotating Circular Saw

Stegmann,

Baumert,

Kabelac

et al. 2024

Energies

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To improve machining processes concerning the usage of lubricants, knowledge of the thermo-mechanical and thermo-fluid interactions at the cutting zone is of great importance. This study focuses on the description of the convective heat transfer which occurs during circular sawing when the lubricant is provided via an internal coolant supply. The highly complex flow field inside the cavity of the sawing process is separated into two distinct flow forms, an impingement and a channel flow. With the aid of experimental and numerical studies, the heat transfer characteristics of these two flow forms have been examined for water and a lubricant used in the circular sawing process. Studies have been conducted over a wide range of Reynolds numbers (impingement flow: 2×103<Re<17×103, channel flow: 1×103<Re<30×103). Additionally, the variation in the inlet temperature of the fluid, as well as the variation in heating power, has been studied. Overall, the impingement flow yields a significantly higher heat transfer than the channel flow with Nußelt-numbers ranging from 120 to 230, whereas the Nußelt-numbers in the case of the channel flow range from 20 to 160. For both flow forms, the use of the lubricant results in a better heat transfer compared with the usage of water. With the aid of these studies, correlations to describe the heat transfer have been derived. The provided correlations are to be used in a coupled numerical model of the chip formation process which also includes the effects of the heat transfer to the coolant lubricant.

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LES of an Asymmetrically Heated High Aspect Ratio Duct at High Reynolds Number at Different Wall Temperatures

Cited by 3 publications

References 24 publications

Assessment of RANS Turbulence Models for Straight Cooling Ducts: Secondary Flow and Strong Property Variation Effects

Assessment of RANS Turbulence Models for Straight Cooling Ducts: Secondary Flow and Strong Property Variation Effects

Prediction Capability of RANS Turbulence Models for Asymmetrically Heated High-Aspect-Ratio Duct Flows

Assessment of the Heat Transfer Conditions in the Cavity of a Rotating Circular Saw

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