Thesis
Effects of partial hydrophilic nano-coating on micro-scale flow boiling under non-uniform heat flux
Washington State University
Master of Science (MS), Washington State University
2017
Handle:
https://hdl.handle.net/2376/100174
Abstract
In the current study, a partial hydrophilic nano-coating, fabricated using nanofluid boiling was employed to mitigate the heat transfer impedances brought by vapor formation during microchannel flow boiling. Experiments were performed using a coated and uncoated microchannel. A resistance heater with a small heat transfer area was used to simulate the non-uniform heat flux under the microchannels. Results indicate that the partial nano-coating can postpone boiling crisis at post critical heat flux operating conditions and induce a larger subcooled boiling temperature difference. However, it also induces a thermal and hydraulic resistance along the microchannel flow path, thus impeding the benefits it provided. Also, coating analysis showed an increase in contact angle and decrease of surface roughness after experiments, suggesting that nano-coating erosion occurs during the experiments due to momentum exchange with the bulk fluid flow. It is, therefore, expected that the effectiveness of the nano-coating are to be diminished over time.
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Details
- Title
- Effects of partial hydrophilic nano-coating on micro-scale flow boiling under non-uniform heat flux
- Creators
- Gordon Yip
- Contributors
- Yoon Jo Kim (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Electrical Engineering and Computer Science, School of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900524802301842
- Language
- English
- Resource Type
- Thesis