Searched for: collection%3Air
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Patel, A. (author), Pecnik, R. (author), Peeters, J.W.R. (author), Boersma, B.J. (author), Hickel, S. (author), Moghadam, M.E. (author)
We investigate the effectiveness of the semi-local Reynolds number Re τ to parametrize wall-bounded flows with strong density, ρ, and viscosity, µ, gradients. Several cases are considered, namely, volumetrically heated low-Mach-number turbulent channel flows, a simultaneously heated and cooled flow with CO2 at supercritical pressure, and heated and...
book chapter 2017
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Peeters, J.W.R. (author), Pecnik, R. (author), Rohde, M. (author), van der Hagen, T.H.J.J. (author), Boersma, B.J. (author)
Heat transfer to fluids at supercritical pressure is different from heat transfer at lower pressures due to strong variations of the thermophysical properties with the temperature. We present and analyze results of direct numerical simulations of heat transfer to turbulent CO2 at 8 MPa in an annulus. Periodic streamwise conditions are imposed so...
journal article 2017
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Peeters, J.W.R. (author), Pecnik, R. (author), Rohde, M. (author), van der Hagen, T.H.J.J. (author), Boersma, B.J. (author)
Heated or cooled fluids at supercritical pressure show large variations in thermophysical properties, such as the density, dynamic viscosity and molecular Prandtl number, which strongly influence turbulence characteristics. To investigate this, direct numerical simulations were performed of a turbulent flow at supercritical pressure (CO2 at 8...
journal article 2016
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Patel, A. (author), Peeters, J.W.R. (author), Boersma, B.J. (author), Pecnik, R. (author)
We theoretically and numerically investigate the effect of temperature dependent density and viscosity on turbulence in channel flows. First, a mathematical framework is developed to support the validity of the semi-local scaling as proposed based on heuristic arguments by Huang, Coleman, and Bradshaw [“Compressible turbulent channel flows: DNS...
journal article 2015
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Patel, A. (author), Peeters, J. (author), Boersma, B.J. (author), Pecnik, R. (author)
We perform Direct Numerical Simulations (DNS) of a turbulent channel flow with temperature dependent density and viscosity. The Navier-Stokes equations are solved using their low Mach number formulation. In the simulations performed, the fluid is internally heated and the temperature at the walls is fixed. The friction Reynolds number based on...
conference paper 2015
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Boersma, B.J. (author), Pecnik, R. (author), Nemati, H. (author), Peeters, J.W.R. (author)
In this paper we discuss the effect of sharp property variations on the turbulent heat transfer in fluids close the critical point. The governing equations for this flow regime are discussed, a short description of the numerical tools that have been developed to study these flows is given. Finally, some results for supercritical heat transfer in...
journal article 2015
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