Effect of filling ratio and orientation on the performance of a multiple turns helium pulsating heat pipe
| Autor: | Laifeng Li, Li Monan, Dong Xu |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Gravity (chemistry) Materials science General Physics and Astronomy chemistry.chemical_element Mechanics 01 natural sciences Vertical orientation Heat pipe chemistry 0103 physical sciences Thermal General Materials Science 010306 general physics Adiabatic process Condenser (heat transfer) Evaporator Helium |
| Zdroj: | Cryogenics. 100:62-68 |
| ISSN: | 0011-2275 |
| DOI: | 10.1016/j.cryogenics.2019.04.006 |
| Popis: | A multi-turn Pulsating Heat Pipe (PHP) made of stainless steel (I.D. 0.5 mm, O.D. 0.8 mm), filled with helium is experimentally investigated. The lengths of the evaporator, adiabatic and condenser sections are 50 mm, 100 mm and 50 mm, respectively. The study focuses on the effect of the filling ratio and the inclination angle (gravity) at different heat input levels on the thermal performance of the cryogenic PHP. Results show that the obvious temperature fluctuation occur at low filling ratios, such as 16.4%, 31.8% and 48.8%. Despite the relatively high number of turns, the gravity still plays a critical role on the PHP thermal performance, especially at medium filling ratio (i.e. 48.8%). At a filling ratio of 31.8%, 66.1% and 94.2%, the thermal performance in 60° orientation is the same as that in vertical orientation. The optimal filling ratio may be within the range between 48.8% and 66.1% and related to the heat input level. |
| Databáze: | OpenAIRE |
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