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Entropy 2018, 20(1), 14; https://doi.org/10.3390/e20010014

Leakage Evaluation by Virtual Entropy Generation (VEG) Method

1
School of Municipal and Environmental Engineering, Jilin Jianzhu University, Changchun 130118, China
2
Department of Engineering Science and Mechanics, Pennsylvania State University, State College, PA 16802, USA
3
Department of Mechanical and Nuclear Engineering, Pennsylvania State University, State College, PA 16802, USA
*
Author to whom correspondence should be addressed.
Received: 15 November 2017 / Revised: 23 December 2017 / Accepted: 28 December 2017 / Published: 29 December 2017
(This article belongs to the Special Issue Non-Equilibrium Thermodynamics of Micro Technologies)
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Abstract

Leakage through microscale or nanoscale cracks is usually hard to observe, difficult to control, and causes significant economic loss. In the present research, the leakage in a pipe was evaluated by the virtual entropy generation (VEG) method. In virtual entropy generation method, the “measured entropy generation” is forced to follow the “experimental second law of thermodynamics”. Taking the leakage as the source virtual entropy generation, a new pipe leakage evaluation criterion was analytically derived, which indicates that the mass leakage rate should be smaller than the pressure drop rate inside a pipe. A numerical study based on computational fluid dynamics showed the existence of an unrealistic virtual entropy generation at a high mass leakage rate. Finally, the new criterion was used in the evaluation of leakage available in the literature. These results could be useful for leakage control or industry criteria design in the future. View Full-Text
Keywords: virtual entropy generation (VEG) method; leakage evaluation; micro/nano-scale crack virtual entropy generation (VEG) method; leakage evaluation; micro/nano-scale crack
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Zhang, Z.; Drapaca, C.; Zhang, Z.; Zhang, S.; Sun, S.; Liu, H. Leakage Evaluation by Virtual Entropy Generation (VEG) Method. Entropy 2018, 20, 14.

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