Numéro
J. Phys. IV France
Volume 09, Numéro PR3, March 1999
Proceedings of the 9th SolarPACES International Symposium on Solar Thermal Concentrating Technologies
STCT 9
Page(s) Pr3-531 - Pr3-536
DOI https://doi.org/10.1051/jp4:1999384
Proceedings of the 9th SolarPACES International Symposium on Solar Thermal Concentrating Technologies
STCT 9

J. Phys. IV France 09 (1999) Pr3-531-Pr3-536

DOI: 10.1051/jp4:1999384

Investigations of rewetting phenomena at steam generation on surfaces with porous coatings

V.I. Borzenko and S.P. Malyshenko

Institute for High Temperatures of RAS, IVTAN, Izhorskaya 13/19, 127412 Moscow, Russia


Abstract
The results of the experimental investigation of elemetary processes and wetting pheomena at boiling on surfaces with porous coatings are presented. Porous coating transform the heat transfer laws, change the values of critical heat flux and generates the new mechanisms of moisture exchange. The main of them are discussed : coating friction effect, asimutal heat pipe effect, drops wetting effect and bulk wave rewetting in channels with porous coating. The importance of the drops wetting for stratified and intermittent flows in horizontal steam generating channels is proven experimentally. Preliminary estimations are done of the velocity and size distributions of secondary drops generated by porous coatings. Wave rewetting mechanisrns are investigated on model experiments at second heat transfer crisis.



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