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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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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