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Thermal Transport and Entropy Production Mechanisms in a Turbulent Round Jet at Supercritical Thermodynamic Conditions

Ries, Florian ; Janicka, Johannes ; Sadiki, Amsini (2017)
Thermal Transport and Entropy Production Mechanisms in a Turbulent Round Jet at Supercritical Thermodynamic Conditions.
In: Entropy, 2017, 19 (8)
Article, Secondary publication

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Item Type: Article
Type of entry: Secondary publication
Title: Thermal Transport and Entropy Production Mechanisms in a Turbulent Round Jet at Supercritical Thermodynamic Conditions
Language: English
Date: 18 August 2017
Place of Publication: Darmstadt
Year of primary publication: 2017
Publisher: MDPI
Journal or Publication Title: Entropy
Volume of the journal: 19
Issue Number: 8
Corresponding Links:
Origin: Secondary publication via sponsored Golden Open Access
Abstract:

In the present paper, thermal transport and entropy production mechanisms in a turbulent round jet of compressed nitrogen at supercritical thermodynamic conditions are investigated using a direct numerical simulation. First, thermal transport and its contribution to the mixture formation along with the anisotropy of heat fluxes and temperature scales are examined. Secondly, the entropy production rates during thermofluid processes evolving in the supercritical flow are investigated in order to identify the causes of irreversibilities and to display advantageous locations of handling along with the process regimes favorable to mixing. Thereby, it turned out that (1) the jet disintegration process consists of four main stages under supercritical conditions (potential core, separation, pseudo-boiling, turbulent mixing), (2) causes of irreversibilities are primarily due to heat transport and thermodynamic effects rather than turbulence dynamics and (3) heat fluxes and temperature scales appear anisotropic even at the smallest scales, which implies that anisotropic thermal diffusivity models might be appropriate in the context of both Reynolds-averaged Navier–Stokes (RANS) and large eddy simulation (LES) approaches while numerically modeling supercritical fluid flows.

Identification Number: 404
URN: urn:nbn:de:tuda-tuprints-67250
Classification DDC: 600 Technology, medicine, applied sciences > 600 Technology
Divisions: 16 Department of Mechanical Engineering > Institute for Energy and Power Plant Technology (EKT)
Date Deposited: 18 Aug 2017 10:02
Last Modified: 08 Dec 2023 06:43
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/6725
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