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| Content Provider | Springer Nature Link |
|---|---|
| Author | Guo, Lei Zhang, Shusheng Cheng, Lin |
| Copyright Year | 2010 |
| Abstract | To explore the mechanism of boiling bubble dynamics in narrow channels, we investigate 2-mm wide Iand Z-shaped channels. The influence of wall contact angle on bubble generation and growth is studied using numerical simulation. The relationships between different channel shapes and the pressure drop are also examined, taking into account the effects of gravity, surface tension, and wall adhesion. The wall contact angle imposes considerable influence over the morphology of bubbles. The smaller the wall contact angle, the rounder the bubbles, and the less time the bubbles take to depart from the wall. Otherwise, the bubbles experience more difficulty in departure. Variations in the contact angle also affect the heat transfer coefficient. The greater the wall contact angle, the larger the bubble-covered area. Therefore, wall thermal resistance increases, bubble nucleation is suppressed, and the heat transfer coefficient is lowered. The role of surface tension in boiling heat transfer is considerably more important than that of gravity in narrow channels. The generation of bubbles dramatically disturbs the boundary layer, and the bubble bottom micro-layer can enhance heat transfer. The heat transfer coefficient of Zshaped channels is larger than that of the I-shaped type, and the pressure drop of the former is clearly higher. |
| Starting Page | 250 |
| Ending Page | 256 |
| Page Count | 7 |
| File Format | |
| ISSN | 20951701 |
| Journal | Frontiers of Energy and Power Engineering in China |
| Volume Number | 5 |
| Issue Number | 3 |
| e-ISSN | 16737504 |
| Language | English |
| Publisher | SP Higher Education Press |
| Publisher Date | 2010-11-23 |
| Publisher Institution | Chinese Universities |
| Publisher Place | Heidelberg |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | nucleate boiling narrow channel numerical simulation bubble dynamics Energy Technology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Energy Engineering and Power Technology |
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