We investigated experimentally the start-up characteristics of a mechanically pumped two-phase loop (MPTCL), with CO2 as working fluid, and a single evaporator that consists of a bent inner ring and an outer ring constructed by stainless tubes with hydraulic diameter of 2.6 mm and length of 9 m, along which totally 54 pieces of heating element are distributed. Experiments were performed in the following conditions: mass flow rates of 1.1, 2.1, and 3.3g/s; heat loads ranged from 50 to 300W, with the heat-load ratios of the inner ring to the outer ring 2.2:1, 1:1, and 1:2.2 at the operational temperature of −15°C, respectively. During the start-up cases, we detected a reverse flow accompanying with pressure spike, which can be understood as explosive boiling, and a subsequent temporal dry-out phenomenon at the outlet of the evaporator, as a result of explosive boiling. The back flow together with the pressure spike is helpful to set up a two-phase flow all along the evaporator, though it may have negative effect on the loop, especially, when coincident explosive boiling happens. However, such a pressure spike that depends on initial superheating should be controlled to avoid possible harm to the loop.
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2010 14th International Heat Transfer Conference
August 8–13, 2010
Washington, DC, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
978-0-7918-4936-1
PROCEEDINGS PAPER
Investigation of Carbon Dioxide Explosive Boiling in Single Evaporator of a Two-Phase Mechanically-Pumped Thermal Control Loop Available to Purchase
Xi-Hui Sun,
Xi-Hui Sun
Sun Yat-Sen University, Guangzhou, China
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Zhen-Cheng Huang,
Zhen-Cheng Huang
Sun Yat-Sen University, Guangzhou, China
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Wen-Jia Xiao,
Wen-Jia Xiao
Sun Yat-Sen University, Guangzhou, China
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Yue Chen,
Yue Chen
Sun Yat-Sen University, Guangzhou, China
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Zhen-Hui He,
Zhen-Hui He
Sun Yat-Sen University, Guangzhou, China
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A. Pauw,
A. Pauw
National Aerospace Laboratory, The Netherlands
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J. van Es
J. van Es
National Aerospace Laboratory, The Netherlands
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Xi-Hui Sun
Sun Yat-Sen University, Guangzhou, China
Zhen-Cheng Huang
Sun Yat-Sen University, Guangzhou, China
Wen-Jia Xiao
Sun Yat-Sen University, Guangzhou, China
Yue Chen
Sun Yat-Sen University, Guangzhou, China
Zhen-Hui He
Sun Yat-Sen University, Guangzhou, China
A. Pauw
National Aerospace Laboratory, The Netherlands
J. van Es
National Aerospace Laboratory, The Netherlands
Paper No:
IHTC14-23167, pp. 669-676; 8 pages
Published Online:
March 1, 2011
Citation
Sun, X, Huang, Z, Xiao, W, Chen, Y, He, Z, Pauw, A, & van Es, J. "Investigation of Carbon Dioxide Explosive Boiling in Single Evaporator of a Two-Phase Mechanically-Pumped Thermal Control Loop." Proceedings of the 2010 14th International Heat Transfer Conference. 2010 14th International Heat Transfer Conference, Volume 1. Washington, DC, USA. August 8–13, 2010. pp. 669-676. ASME. https://doi.org/10.1115/IHTC14-23167
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