LAPSE:2023.27962v1
Published Article
LAPSE:2023.27962v1
Thermodynamic Analysis of the Dryout Limit of Oscillating Heat Pipes
Florian Schwarz, Vladimir Danov, Alexander Lodermeyer, Alexander Hensler, Stefan Becker
April 11, 2023
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.
Keywords
dryout limit, operation limits, optimal filling ratio, oscillating heat pipe (OHP), pulsating heat pipe (PHP)
Suggested Citation
Schwarz F, Danov V, Lodermeyer A, Hensler A, Becker S. Thermodynamic Analysis of the Dryout Limit of Oscillating Heat Pipes. (2023). LAPSE:2023.27962v1
Author Affiliations
Schwarz F: Institute of Process Machinery and Systems Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany; Siemens AG, 91056 Erlangen, Germany
Danov V: Siemens AG, 91056 Erlangen, Germany
Lodermeyer A: Institute of Process Machinery and Systems Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany
Hensler A: Siemens AG, 91056 Erlangen, Germany
Becker S: Institute of Process Machinery and Systems Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany
Journal Name
Energies
Volume
13
Issue
23
Article Number
E6346
Year
2020
Publication Date
2020-12-01
ISSN
1996-1073
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PII: en13236346, Publication Type: Journal Article
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