Gas Liquefaction (1)

Monday August 26, 2019 from 10:30 to 12:10

Room: 519b

TS-100.3 Theoretical analysis of supersonic phase change for carbon dioxide in a de Laval nozzle

José R. Simões-Moreira, Brazil

Professor
Mechl. Eng. Dept.
University of Sao Paulo

Abstract

Theoretical analysis of supersonic phase change for carbon dioxide in a de laval nozzle.

Julian Restrepo1, Andres F Bolanos-Acosta1, José R Simões-Moreira1.

1University of São Paulo / Polytechnic School / SISEA (Alternative energy systems laboratory), São Paulo, Brazil

Carbon dioxide is present in many gases mixtures, such as biogas and natural gas, besides air. This poses an important question on how to extract that gas component at affordable cost and technology.

One of the more promising techniques for carbon dioxide separation is the supersonic separation, which consists in the expansion of the fluid inside a supersonic nozzle and as the temperature falls due to the expansion, clusters (solid or liquid) of carbon dioxide will form leading to a condensation wave within the supersonic nozzle.

Pressure, temperature, and Mach number were calculated using the one-dimensional analysis for real gas. The homogeneous nucleation was calculated using the classical nucleation theory and finally it was estimated the region where the change phase will occur, being located between the Spinodal Line and the homogeneous nucleation (Wilson Line).

 

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