An Axisymmetric Flow of a Mixture of Real Gases with a Condensing Component

Abstract

A synthesized physicomathematical model of a binary mixture of real gases with a condensing component is used to perform numerical investigations of axisymmetric flow in nozzles of different geometry. The effect is investigated, which the model of state for gas makes on the position of the "condensation jump", on the mass spectrum of droplets, and on the flow rate realized by nozzles of preassigned geometry. Comparison of numerical results is made for the Redlich-Kwong and Mendeleev-Clapeyron models and for two sets of components of a binary gas mixture.

Applications of CFD in Natural Gas Processing and Transportation

“…The vertical line x=x* confirms that, for both cases, the Mach number value of unity is obtained at the critical cross section of the nozzle. This conclusion agreed very well with the predictions in recent studies (Arina, 2004, Molleson & Stasenko, 2005, and Drikakis & Tsangaris, 1993. It can, therefore, be concluded that the sonic position always occurs at the throat and is independent of the nozzle geometry and gas thermodynamic model.…”

“…1. Nozzle geometries studied in the research Figure 2 shows the variation of Mach number with position in real case and the comparison with results obtained from the work of Molleson and Stasenko (2005). One can see that choke (sonic velocity, M=1) occurs at the throat regardless of the EOS used.…”

“…Since most of published research has been concerned with the Laval nozzle, we validated our results by applying the numerical technique for such geometry and compared our results with the most recent available data (Arina, 2004;and Molleson & Stasenko, 2005) before proceeding and applying it to the modified nozzle systems. Molleson and Stasenko (2005) performed their investigation for a nozzle whose geometry is shown in Figure 1-a.…”

“…Molleson and Stasenko (2005) performed their investigation for a nozzle whose geometry is shown in Figure 1-a. Their working fluid was methane at 70 bar inlet stagnation pressure and 250 K inlet stagnation temperature while the value of exit Mach number according to their supersonic exit radii was 1.2.…”

Selective dehydration of high-pressure natural gas using supersonic nozzles

“…Real gas laws predict the true behaviour of a gas by considering the terms to describe attractions between molecules. The van der Waals (VW) equation which was the first cubic equation to predict the real gas properties was developed in 1873 (Molleson and Stasenko, 2005 (Jacobsen et al, 1997):…”