• Obtain flow boiling database in a long-duration microgravity environment
• Obtain flow condensation database in a long-duration microgravity environment
• Develop an experimentally validated, mechanistic model for microgravity flow boiling critical heat flux (CHF) and dimensionless criteria to predict minimum flow velocity required to ensure gravity-independent CHF
• Develop an experimentally validated, mechanistic model for microgravity
annular condensation and dimensionless criteria to predict minimum
flow velocity required to ensure gravity-independent annular condensation;
also develop correlations for other condensation regimes in microgravity
• Reduced gravity condensation and flow boiling heat transfer data and models are virtually nonexistent.
• Long-duration space missions will demand additional power and heat dissipation requirements compared to current space missions. To reduce size and weight, the transition from single-phase to two-phase thermal management systems is necessary.
• In addition, two-phase thermal management systems are more effective heat transfer systems compared to single-phase systems because two-phase systems rely on latent heat exchange rather than sensible heat exchange.
• Flow boiling and condensation data in microgravity are also needed to validate numerical simulation tools that could be used to design space-based two-phase thermal management systems.
• Develop two-phase flow loop to condition dielectric coolant FC-72 (or normal perfluorohexane (C6F14), pure constituent in FC-72) to preset values of flow rate, pressure, and temperature to the test module
• Develop Flow Boiling Module (FBM) to study subcooled and saturated flow boiling and critical heat flux (CHF)
• Develop two separate Condensation Modules to enable study
of condensation flow and heat transfer regimes: Condensation
Module (CM1) for heat transfer measurements and Condensation
Module (CM2) for flow visualization
Contacts at NASA Glenn Research Center
Project Scientist: David Chao, NASA
Principal Investigator: Issam Mudawar, Purdue University
Co-Principal Investigator: Mohammad
Mojibul Hasan, NASA GRC