High Heat Flux Experiments On Mock-Ups With Porous Coating On The Inner Surface Of Circular Coolant Channels


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ITER Team (Garching, Germany) - International Thermonuclear Experimental Reactor


The series of High Heat Flux experiments on circular tubes with the uniform heat loading and on rectangular samples with cylindrical cooling ducts with the one-side heating were carried out in order to study the effect of a porous coating deposed on inner cooled surfaces on the Incident Critical Heat Flux (ICHF) performance at water sub-cooled boiling regime. The stable increasing of ICHF obtained on samples with porous coating over ICHF on smooth surfaces was established for wide range of velocities (3 - 15 m/s) and subcooling (40 - 180 C). Test results have shown the heat removal ability of porous coatings to sustain an incident heat flux up to 65 MW/m2 at the uniform circular loading on tubular channels (velocity 15 m/s and subcooling 180 C) and up to 45 MW/m2 at one-side heating on rectangular mock-ups with tubular channels (velocity 5.6 m/s and sub-cooling 160 C). The further increasing of heating was limited by test facility.
Empirical correlation between ICHF at one-side heating condition and geometrical/operation parameters of elements of cooling design was defined.

The presented results of the experiments convince that the porous coating deposed on the inner wet surface of cooling ducts is the one of the most perspective heat remove enhanced technique, because of its:

- relatively simplicity of manufacture technology;
- obtained high ICHF without significant increasing of the hydraulic resistance for the wide range of the coolant parameters;
- "soft" crisis development with the temperature increasing rate ~5-7 C/s;
- reducing of the temperature gradient along the wet perimeter.



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