An Assessment of Momentum Models for Two-phase Thermosyphon Loop
Two-phase thermosyphon heat exchangers are widely used in different industry fields. The fluid flow characteristic is very important for the design of thermosyphon. However, the existing two-phase models are not accurate enough for the simulation of two-phase thermosyphon loop .Therefore it is impor...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | zho |
| Published: |
Journal of Refrigeration Magazines Agency Co., Ltd.
2013-01-01
|
| Series: | Zhileng xuebao |
| Subjects: | |
| Online Access: | http://www.zhilengxuebao.com/thesisDetails#10.3969/j.issn.0253-4339.2013.02.001 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Two-phase thermosyphon heat exchangers are widely used in different industry fields. The fluid flow characteristic is very important for the design of thermosyphon. However, the existing two-phase models are not accurate enough for the simulation of two-phase thermosyphon loop .Therefore it is important to make an assessment of existing two-phase momentum models corresponding to thermosyphon loop features. The mathematical model of two-phase thermosyphon loop, which include 4 homogenous pressure drop models, 24 separated-phase momentum combination models (4 separated-phase frictional pressure drop models multiply 6 representative void fraction correlations), has been developed in the paper. The predicted results from different models are compared with the experimental results of two-phase thermosyphon with refrigerants H2O, R113 and R600a. The comparison results show that the combination of Lorkhart-Martinelli frictional pressure drop model and Tom void fraction model is better than other models. Finally, the flow features of two-phase thermosyphon loop have been simulated. It is shown that for a specific loop, the mass flux increases and then decreases slowly with the increase of heat flux. A reasonable explanation is given to the phenomenon. |
|---|---|
| ISSN: | 0253-4339 |