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The effect of thermal boundary conditions on forced convection heat transfer to fluids at supercritical pressure

Published online by Cambridge University Press:  12 July 2016

Hassan Nemati ,
Ashish Patel ,
Bendiks J. Boersma  and
Rene Pecnik
Hassan Nemati
Affiliation:
Process and Energy Department, Delft University of Technology, Leeghwaterstraat 39, 2628 CB Delft, The Netherlands
Ashish Patel
Affiliation:
Process and Energy Department, Delft University of Technology, Leeghwaterstraat 39, 2628 CB Delft, The Netherlands
Bendiks J. Boersma
Affiliation:
Process and Energy Department, Delft University of Technology, Leeghwaterstraat 39, 2628 CB Delft, The Netherlands
Rene Pecnik*
Affiliation:
Process and Energy Department, Delft University of Technology, Leeghwaterstraat 39, 2628 CB Delft, The Netherlands
*
†Email address for correspondence: r.pecnik@tudelft.nl
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Abstract

We use direct numerical simulations to study the effect of thermal boundary conditions on developing turbulent pipe flows with fluids at supercritical pressure. The Reynolds number based on pipe diameter and friction velocity at the inlet is $Re_{{\it\tau}0}=360$ and Prandtl number at the inlet is $Pr_{0}=3.19$ . The thermodynamic conditions are chosen such that the temperature range within the flow domain incorporates the pseudo-critical point where large variations in thermophysical properties occur. Two different thermal wall boundary conditions are studied: one that permits temperature fluctuations and one that does not allow temperature fluctuations at the wall (equivalent to cases where the thermal effusivity ratio approaches infinity and zero, respectively). Unlike for turbulent flows with constant thermophysical properties and Prandtl numbers above unity – where the effusivity ratio has a negligible influence on heat transfer – supercritical fluids shows a strong dependency on the effusivity ratio. We observe a reduction of 7 % in Nusselt number when the temperature fluctuations at the wall are suppressed. On the other hand, if temperature fluctuations are permitted, large property variations are induced that consequently cause an increase of wall-normal velocity fluctuations very close to the wall and thus an increased overall heat flux and skin friction.

JFM classification

Boundary Layers: Pipe flow boundary layer Turbulent Flows: Turbulence simulation Turbulent Flows: Turbulent Flows

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Type
Papers
Information
Journal of Fluid Mechanics , Volume 800 , 10 August 2016 , pp. 531 - 556
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© 2016 Cambridge University Press 

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Nemati et al.supplemenatry movie

Velocity and enthalpy contour plots at a radial plane close to the wall and several cross sectional planes of the pipe.

Download Nemati et al.supplemenatry movie(Video)
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