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A Comprehensive Evaluation of Turbulence Models for Predicting Heat Transfer in Turbulent Channel Flow across Various Prandtl Number Regimes

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العنوان: A Comprehensive Evaluation of Turbulence Models for Predicting Heat Transfer in Turbulent Channel Flow across Various Prandtl Number Regimes
المؤلفون: Liyuan Liu, Umair Ahmed, Nilanjan Chakraborty
المصدر: Fluids, Vol 9, Iss 2, p 42 (2024)
بيانات النشر: MDPI AG
سنة النشر: 2024
المجموعة: Directory of Open Access Journals: DOAJ Articles
مصطلحات موضوعية: heat transfer in turbulent channel flow, passive scalar transport, turbulence modelling, wall-bounded turbulence, Thermodynamics, QC310.15-319, Descriptive and experimental mechanics, QC120-168.85
الوصف: Turbulent heat transfer in channel flows is an important area of research due to its simple geometry and diverse industrial applications. Reynolds-Averaged Navier–Stokes (RANS) models are the most-affordable simulation methodology and are often the only viable choice for investigating industrial flows. However, accurate modelling of wall-bounded flows is challenging in RANS, and the assessment of the performance of RANS models for heated turbulent channel flow has not been sufficiently investigated for a wide range of Reynolds and Prandtl numbers. In this study, five RANS models are assessed for their ability to predict heat transfer in channel flows across a wide range of Reynolds and Prandtl numbers ( P r ) by comparing the RANS results with respect to the corresponding Direct Numerical Simulation data. The models include three Eddy Viscosity Models (EVMs): standard k − ϵ , low Reynolds number k − ϵ L S , and k − ω S S T , as well as two Reynolds Stress Models (RSMs): Launder–Reece–Rodi and Speziale–Sarkar–Gatski models. The study analyses the Reynolds number effects on turbulent heat transfer in a channel flow at a P r of 0.71 for friction Reynolds number values of 180 , 395 , 640 , and 1020. The results show that all models accurately predict velocity across all Reynolds numbers, but the accuracy of mean temperature prediction drops with increasing Reynolds number for all models, except for the k − ω S S T model. The study also analyses the P r effects on turbulent heat transfer in a channel flow with P r values between 0.025 and 10.0 . An error analysis is performed on the results obtained from different ...
نوع الوثيقة: article in journal/newspaper
اللغة: English
تدمد: 2311-5521
Relation: https://www.mdpi.com/2311-5521/9/2/42; https://doaj.org/toc/2311-5521; https://doaj.org/article/5c0f3590b477401db4092f4e350282aa
DOI: 10.3390/fluids9020042
الاتاحة: https://doi.org/10.3390/fluids9020042
https://doaj.org/article/5c0f3590b477401db4092f4e350282aa
رقم الانضمام: edsbas.4EDB4D0B
قاعدة البيانات: BASE
الوصف
تدمد:23115521
DOI:10.3390/fluids9020042