Numerical Analysis of Heat Transfer During Cooling of Supercritical Fluid by Means of Direct Numerical Simulation

Sandeep Pandey (), Xu Chu () and Eckart Laurien ()
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Sandeep Pandey: University of Stuttgart, Institute of Nuclear Technology and Energy Systems
Xu Chu: University of Stuttgart, Institute of Aerospace Thermodynamics
Eckart Laurien: University of Stuttgart, Institute of Nuclear Technology and Energy Systems

A chapter in High Performance Computing in Science and Engineering ' 17, 2018, pp 241-254 from Springer

Abstract: Abstract Supercritical fluids have a wide spectrum of application, ranging from power generation to enhanced oil extraction. The sensitive nature of thermophysical properties makes the heat transfer complicated. Therefore, in this work, an investigation is made for the vertically-oriented pipe to understand the physics behind the heat transfer deterioration occurring during cooling. For that, carbon dioxide is chosen as working fluid, and direct numerical simulations with the open source finite volume code OpenFOAM have been performed with variation in the strength of body force due to buoyancy. It was found out that body force affects the axial temperature profile. Initial examination of turbulence statistics revealed that turbulence is modulated by buoyancy and deacceleration. Further investigation unveiled that long 1-dimensional structures characterized by streak elongation were present in the downward flow. In the end, Octant analysis indicates the reduction in ejection and sweep events for downward flow caused the decrease in turbulence.

Date: 2018
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Persistent link: https://EconPapers.repec.org/RePEc:spr:sprchp:978-3-319-68394-2_14

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DOI: 10.1007/978-3-319-68394-2_14

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