K, Vasudeva Rao
(2016)
Numerical Simulation of Turbulent Channel Flow at Low Prandtl Number.
Masters thesis, Indian Institute of Technology Hyderabad.
Abstract
Liquid metals are primary coolants in Generation IV nuclear reactors. For low Prandtl
fluids, such as liquid metals, classical Reynolds analogy of using turbulent Prandtl number
close to unity doesnt predict heat transfer characteristics correctly. In the present study
turbulent forced convection flow in a channel at low
Pr
is studied numerically. Turbulence
is modeled by Reynolds averaged Navier- Stokes
(
RANS
)
equations with low Reynolds
number k-
beta
launder sharma model. The governing equations are solved using high accuracy
compact finite difference schemes with four stage Runge-Kutta method for time integration.
Heat transfer characteristics of flow such as effect of
Re
,
Pr
on temperature and
Nu
are
presented for different Reynolds and Prandtl numbers. A parametric study on variation
of turbulent Prandtl number is done and using it comparing with the experimental
Nu
correlation, a new correlation has been developed for turbulent Prandtl number for low
Pr
flows. The present results are matching well with the experimental and numerical results
available in the literature.
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