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Article

Thermodynamic Analysis of the Dryout Limit of Oscillating Heat Pipes

1
Institute of Process Machinery and Systems Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany
2
Siemens AG, 91056 Erlangen, Germany
*
Author to whom correspondence should be addressed.
Energies 2020, 13(23), 6346; https://doi.org/10.3390/en13236346
Received: 23 October 2020 / Revised: 16 November 2020 / Accepted: 26 November 2020 / Published: 1 December 2020
The operating limits of oscillating heat pipes (OHP) are crucial for the optimal design of cooling systems. In particular, the dryout limit is a key factor in optimizing the functionality of an OHP. As shown in previous studies, experimental approaches to determine the dryout limit lead to contradictory results. This work proposes a compact theory to predict a dryout threshold that unifies the experimental and analytical data. The theory is based on the influence of vapor quality on the flow pattern. When the vapor quality exceeds a certain limit (x = 0.006), the flow pattern changes from slug flow to annular flow and the heat transfer decreases abruptly. The results indicate a uniform threshold value, which has been validated experimentally and by the literature. With that approach, it becomes possible to design an OHP with an optimized filling ratio and, hence, substantially improve its cooling abilities. View Full-Text
Keywords: optimal filling ratio; pulsating heat pipe (PHP); oscillating heat pipe (OHP); dryout limit; operation limits optimal filling ratio; pulsating heat pipe (PHP); oscillating heat pipe (OHP); dryout limit; operation limits
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MDPI and ACS Style

Schwarz, F.; Danov, V.; Lodermeyer, A.; Hensler, A.; Becker, S. Thermodynamic Analysis of the Dryout Limit of Oscillating Heat Pipes. Energies 2020, 13, 6346. https://doi.org/10.3390/en13236346

AMA Style

Schwarz F, Danov V, Lodermeyer A, Hensler A, Becker S. Thermodynamic Analysis of the Dryout Limit of Oscillating Heat Pipes. Energies. 2020; 13(23):6346. https://doi.org/10.3390/en13236346

Chicago/Turabian Style

Schwarz, Florian, Vladimir Danov, Alexander Lodermeyer, Alexander Hensler, and Stefan Becker. 2020. "Thermodynamic Analysis of the Dryout Limit of Oscillating Heat Pipes" Energies 13, no. 23: 6346. https://doi.org/10.3390/en13236346

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