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Revisiting T+ Versus Pry+ Scaling in Turbulent Flows With 0.01 ≤ Pr ≤ 760 Using RANS

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Fluid Mechanics and Fluid Power

Abstract

This paper presents the computational analysis of thermally and hydraulically developing two-dimensional incompressible turbulent flow over the smooth flat plate with different fluids (liquid metal to oil) having a Prandtl number (Pr) in the range 0.01–760 with ANSYS. Assessment of non-dimensional temperature (T+) with normalized wall distance (y+) over the entire range of Pr reveals a possible dependence of initiation of log-law region on Pr. This allows investigating the scaling of T+ with Pry+ over the wide range of Pr. Finally, some limitations of wall functions at extreme Pr are presented.

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Abbreviations

\(\alpha\) :

Thermal diffusivity of fluid

\(\alpha_{t}\) :

Turbulent thermal diffusivity

i, j :

Indices for Newtonian summation

k :

Von Karman constant (=0.41) in wall laws

\(v\) :

Kinematic viscosity

\(v_{t}\) :

Eddy viscosity

\(\varphi\) :

A flow variable

Pr :

Prandtl number

Pr t :

Turbulent Prandtl number

Re :

Reynolds number

\(\overline{u}_{1}\) :

Time-average velocity component along xi

U :

Free stream velocity

U :

Free stream temperature

x1 or x:

Axial direction

x2 or y:

Cross-stream direction

\(\overline{T}\) :

Time-averaged temperature

\(T^{ + }\) :

Non-dimensional statistical temperature

U :

Free stream temperature

y + :

Non-dimensional height

()′:

Fluctuating quantities

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Correspondence to Ankit Kumar .

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Kumar, K., Aswal, K., Rajwade, M.K., Kumar, A., Mondal, S.S., Chandra, L. (2021). Revisiting T+ Versus Pry+ Scaling in Turbulent Flows With 0.01 ≤ Pr ≤ 760 Using RANS. In: Prabu, T., Viswanathan, P., Agrawal, A., Banerjee, J. (eds) Fluid Mechanics and Fluid Power. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-16-0698-4_45

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  • DOI: https://doi.org/10.1007/978-981-16-0698-4_45

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  • Print ISBN: 978-981-16-0697-7

  • Online ISBN: 978-981-16-0698-4

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