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Study of a loop heat pipe using neutron radiography.
John M Cimbala1, Jack S Brenizer, Abel Po-Ya Chuang
1Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, 234 Reber Building, University Park, PA 16802, USA. jmc6@psu.edu
Summary
Neutron imaging effectively studies loop heat pipes (LHPs), revealing two-phase flow and aiding in problem correction. This technique promises enhanced understanding and design improvements for LHPs.
Area of Science:
- Thermal Engineering
- Experimental Physics
Background:
- Loop heat pipes (LHPs) are critical thermal management devices.
- Understanding two-phase flow and wick behavior is essential for LHP performance.
Purpose of the Study:
- To evaluate neutron imaging as an experimental tool for studying LHPs.
- To identify and address operational issues in LHPs using neutron imaging.
Main Methods:
- Real-time neutron radioscopy and single-exposure neutron radiography were employed.
- Neutron imaging was used to visualize internal LHP components and phenomena.
Main Results:
- Identified and corrected a cooling water distribution issue in the condenser.
- Visualized two-phase flow (liquid and vapor) within various LHP components.
- Demonstrated the potential for identifying partial wick dry-out using neutron imaging.
Conclusions:
- Neutron imaging is a powerful, non-invasive technique for LHP research.
- This method facilitates a deeper understanding of LHP operational dynamics.
- Neutron imaging is expected to improve LHP modeling and design.