The Marangoni effect in axially grooved variable-conductance heat pipes
Abstract
An analysis is developed for the Marangoni effect, due to surface tension variation with temperature, in axially grooved variable-conductance heat pipes (VCHPs) and compared with test data. The axial momentum equation is solved, accounting for the axial variation in surface tension forces due to changes in meniscus length, as well as changes in surface tension and liquid-channel wall friction due to the recirculating Marangoni flow in the gas-blocked region. The NASA Groove Analysis Program (GAP) has been modified to include these changes. Results indicate very substantial reductions in transport capacity for VCHPs compared with original isothermal values.
- Publication:
-
American Institute of Aeronautics and Astronautics Conference
- Pub Date:
- June 1982
- Bibcode:
- 1982aiaa.confT....K
- Keywords:
-
- Axial Flow;
- Computational Fluid Dynamics;
- Conductive Heat Transfer;
- Free Convection;
- Heat Pipes;
- Interfacial Tension;
- Flow Equations;
- Grooves;
- Liquid Flow;
- Liquid-Liquid Interfaces;
- Menisci;
- Temperature Control;
- Temperature Effects;
- Temperature Gradients;
- Fluid Mechanics and Heat Transfer