Oscillating (Pulsating) Heat Pipes. An OHP consists of a capillary sized tube and a refrigerant. Most OHPs are formed in closed serpentine loops with multiple turns, but OHPs can operate in other configurations Closed End (serpentine but not looped) Open End
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Oscillating (Pulsating) Heat Pipes
Static Slug/Plug distribution, generation of small bubbles at high temps. similar to nucleate boiling
Critical Heat Flux
Oscillatory slug/plug flow develops in individual loops
‘Stable’ oscillations develop, amplitudes increase with increasing heat flux, and oscillations in multiple tubes come into phase with one another
-direction is arbitrary and periodically changes (more so with lower heat flux)
-local oscillations superimposed on system oscillation
Annular flow develops in fluid traveling from the evaporator to condenser
The OHP Advantage and Project Goals
Project Objective: Further the development of the technology/understanding required for successful implementation of an OHP in spacecraft thermal control applications.
Approach: theoretical and experimental
Deliverable: OHP design guidelines and a physics-based, but semi-empirical, model suitable for design