Two-dimensional simulation of a two-phase, regenerative pumped radiator loop utilizing direct contact heat transfer with phase change
Abstract
An innovative pumped loop concept for 600 K space power system radiators utilizing direct contact heat transfer, which facilitates repeated startup/shutdown of the power system without complex and time-consuming coolant thawing during power startup, is under development. The heat transfer process with melting/freezing of Li in an NaK flow was studied through two-dimensional time-dependent numerical simulations to characterize and predict the Li/NaK radiator performance during startup (thawing) and shutdown (cold-trapping). Effects of system parameters and the criteria for the plugging domain are presented together with temperature distribution patterns in solid Li and subsequent melting surface profile variations in time.
- Publication:
-
IECEC-90; Proceedings of the 25th Intersociety Energy Conversion Engineering Conference, Volume 4
- Pub Date:
- 1990
- Bibcode:
- 1990iece....4....8R
- Keywords:
-
- Heat Radiators;
- Heat Transfer;
- Molten Salts;
- Spacecraft Power Supplies;
- Lithium;
- Mathematical Models;
- Potassium Compounds;
- Sodium Compounds;
- Fluid Mechanics and Heat Transfer