The objective of this paper is to perform a detailed analysis of the process of gas absorption to a thin liquid film adjacent to a spinning disk. This particular process has application in the design of space-based chemical processes where effects of gravity are negligible. The film is formed by the radial spreading of the liquid along the surface of the disk due to centrifugal force. The gaseous medium exposed to the disk is absorbed into the liquid film. The process was modeled by establishing equations for the conservation of mass, momentum, and species concentration and solving them analytically. The chemical reaction between the gas and the liquid was assumed to be of the first order. This contributed a source term as a linear function of concentration in the species conservation equation. Appropriate boundary conditions were used to solve these equations to develop expressions for the local concentration of gas across the thickness of the film and the distributions of film height, bulk concentration, and Sherwood number along the radius of the disk. The partial differential equation for species concentration was solved using the separation of variables technique with the subsequent application of Duhamel's theorem. It was found that at all radial locations, the Sherwood number increases with the Reynolds number and the inverse of the Ekman number. Numerical results are presented for two industrially important reactions, namely, the reaction of oxygen with sodium dithionite and the absorption of carbon dioxide in monoethanolamine solutions.
Absorption in a microgravity environment: analysis of a spinning disk reaktor
Absorption in einer Mikroschwerkraft-Umgebung: Analyse eines Schleuderscheibenreaktors
1995
11 Seiten, 12 Bilder, 1 Tabelle, 18 Quellen
Conference paper
English
Absorption (Stoff) , Gas , Flüssigkeitsfilm , Film (Dünnschicht) , Schleudern (Zentrifugieren) , Scheibe (Bauteil) , Schwerkraft , chemischer Reaktor , Raumfahrt , Zentrifugalkraft , Modell , Konzentration , chemische Reaktion , Randbedingung , partielle Differenzialgleichung , Reynolds-Zahl , Sauerstoff , Natriumverbindung , Kohlendioxid , Sherwood-Zahl
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