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Natural convection cooling of a hot vertical wall wet by a falling liquid film

Aiello, G.; Ciofalo, M.

Abstract:
The system studied is a plane channel delimited by two vertical walls, one of which is imposed an arbitrary temperature profile and may be partially or totally wet by a liquid film, while the other is adiabatic. Air from the environment flows along the channel, driven by buoyancy forces. Its mass flow rate depends on the hydraulic resistances and on the distribution of temperature and humidity (hence, density) along the channel, which, in turn, depends on the heat and mass transfer between hot wall and humid air. Due to evaporative or boiling mass transfer, the liquid film, if present, shrinks as it descends along the hot wall, and may be completely dried out at some height. A simplified computational model of the above system was developed and applied to the prediction of relevant quantities, such as the total energy subtracted to the hot wall, for a range of conditions (hot wall temperature and its distribution; film flow rate; ambient air temperature and humidity; channel height and thickness; localized hydraulic resistance).


Postprint §
DOI: 10.5445/IR/170073891
Veröffentlicht am 07.02.2022
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Materialforschung - Angewandte Werkstoffphysik (IMF1) (IMF1)
Publikationstyp Proceedingsbeitrag
Publikationsjahr 2008
Sprache Englisch
Identifikator ISBN: 88-88198-13-X
KITopen-ID: 170073891
HGF-Programm 31.30.04 (POF I, LK 01) ECRH Heiz.u.Strombetr. Port Plug-Entw.
Erschienen in Proceedings. 11th International Conference Multiphase Flow in Industrial Plants : Splendid Hotel "La Torre" - Palermo, Italy September 7-10, 2008
Veranstaltung 11th International Conference Multiphase Flow in Industrial Plants (2008), Palermo, Italien, 07.09.2008 – 10.09.2008
Verlag ANIMP Servici
Seiten 687-95
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