Thesis
Single/two-phase flow maldistribution in minichannel heat-sinks under non-uniform heating
Washington State University
Master of Science (MS), Washington State University
2015
Handle:
https://hdl.handle.net/2376/100876
Abstract
In the present study, single phase and two-phase heat transfer characteristics in minichannel heat sinks under non-uniform heating were experimentally and theoretically investigated. Experiments have been done on three different test sections. Pin-fin and strip-fin heat sinks fabricated on a brass plate and a mixed configuration of hydrophobic and hydrophilic coatings established on a thin steel plate as the heat sink. In all cases, a spot-heater was attached on the backside of the minichannel heat-sinks to simulate the non-uniform heating. The surface temperature distribution caused by the non-uniform heating is measured using the thermocouples attached to the minichannel heat-sinks. . It was observed that the two dimensional expansion of vapor in the pin-fin minichannel heat-sink allowed improved distribution of vapor and thereby lower vapor quality. The temperature rises at the hot-spot locations were also significantly lower in the pin-fin minichannel heat-sink, which means pin-fin structure is more suitable for hot-spot cooling. The effects of mass flow rate and heat flux on heat transfer capability were explored and discussed in all three cases. The heat transfer rate is expected to be significantly higher using two-phase flow, which means it is more suitable for electronics cooling devices. It is also observed that the specific temperature distribution pattern and the specific vapor quality in the hydrophilic sample causes the higher heat transfer coefficient.
Metrics
Details
- Title
- Single/two-phase flow maldistribution in minichannel heat-sinks under non-uniform heating
- Creators
- Navid Saneie
- 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
- 99900525299501842
- Language
- English
- Resource Type
- Thesis