ABSTRACT
Subcooled flow boiling heat transfer experiments were performed with a 50/50 ethylene glycol/water mixture in a finned aluminum channel. The channel represented a hybrid electric vehicle power electronic cold plate receiving a 50/50 mixture from the radiator at 105°C and 2 atmospheres. Experiments used a range of mixture flow rates and both top- and bottom-heating situations. Boiling curves were generated, and subcooled flow boiling heat transfer coefficients were determined including the test channel fin effects. Subcooled flow boiling heat transfer coefficients showed a 25–30% increase compared to single-phase convection.
Nomenclature
= | area, m2 | |
= | mass specific heat capacity, J/kgK | |
= | heat transfer coefficient, W/m2K | |
= | height, m | |
= | thermal conductivity, W/mK | |
= | mass flowrate, kg/s | |
= | perimeter, m | |
= | heat transfer rate, W | |
= | temperature, K | |
= | direction, m | |
= | fin boiling length, m |
Subscripts
= | base, boiling | |
= | cross-sectional, convection | |
= | inlet, input | |
= | loss | |
= | 50/50 ethylene glycol/water mixture | |
= | outlet |
Acknowledgment
The authors are grateful for the support and helpful insights from program managers Lee Slezak and David Anderson.