Leakage evaluation by virtual entropy generation (VEG) method

Zhichao Zhang, Corina Drapaca, Zhifeng Zhang, Shuaifang Zhang, Shimei Sun, Hui Liu

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Leakage throughmicroscale 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.

Original languageEnglish (US)
Article number14
JournalEntropy
Volume20
Issue number1
DOIs
StatePublished - Jan 1 2018

Fingerprint

leakage
entropy
evaluation
computational fluid dynamics
pressure drop
economics
cracks
industries
thermodynamics
causes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Zhang, Z., Drapaca, C., Zhang, Z., Zhang, S., Sun, S., & Liu, H. (2018). Leakage evaluation by virtual entropy generation (VEG) method. Entropy, 20(1), [14]. https://doi.org/10.3390/e20010014
Zhang, Zhichao ; Drapaca, Corina ; Zhang, Zhifeng ; Zhang, Shuaifang ; Sun, Shimei ; Liu, Hui. / Leakage evaluation by virtual entropy generation (VEG) method. In: Entropy. 2018 ; Vol. 20, No. 1.
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Zhang, Z, Drapaca, C, Zhang, Z, Zhang, S, Sun, S & Liu, H 2018, 'Leakage evaluation by virtual entropy generation (VEG) method', Entropy, vol. 20, no. 1, 14. https://doi.org/10.3390/e20010014

Leakage evaluation by virtual entropy generation (VEG) method. / Zhang, Zhichao; Drapaca, Corina; Zhang, Zhifeng; Zhang, Shuaifang; Sun, Shimei; Liu, Hui.

In: Entropy, Vol. 20, No. 1, 14, 01.01.2018.

Research output: Contribution to journalArticle

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T1 - Leakage evaluation by virtual entropy generation (VEG) method

AU - Zhang, Zhichao

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AU - Zhang, Zhifeng

AU - Zhang, Shuaifang

AU - Sun, Shimei

AU - Liu, Hui

PY - 2018/1/1

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AB - Leakage throughmicroscale 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.

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