Authors & Affiliations
Shcherbakov S.I.
A.I. Leypunsky Institute for Physics and Power Engineering, Obninsk, Russia
Shcherbakov S.I. – Senior Researcher. Contacts: 1, pl. Bondarenko, Obninsk, Kaluga region, Russia, 249033. Tel.: +7 (484) 399-84-43; e-mail:
Abstract
The paper describes a computational model for the flow of a multicomponent mixture with different values of the components local velocities. Components can transform into each other. These are boiling, condensation, dew, crystallization from solution and similar processes. The model is intended for engineering assessments of processes in equipment and is simplified – each component is represented by local values of concentration (volume fraction) and velocity vector. Local velocity vectors represent a combination of average volume velocity and drift velocity for each component. Average volumetric velocities of the mixture are calculated using any algorithm for the flow of a homogeneous medium containing internal sources of volumetric flow. Drift velocities are determined from slip velocities and component concentrations. Slip rates are specified by algebraic relations and depend on the local accelerations of the mixture. The distribution of component concentrations is calculated using the transport equations of components, the number of which is one less than the number of components. The transport equations contain the sources of components. The source of a component is the sum of the decays of other components into this component minus the sum of the decays of this component into others. The sum of the sources of all components is the source of the volumetric flow rate for calculating the average volumetric velocity. The properties of the mixture are calculated based on the concentrations and properties of the components. The model is implemented as part of the Turboflow application for three components. Examples of calculation of multicomponent flows are given – boiling of water in a channel and a large volume, transfer and deposition of an impurity in a trap, flow of a mixture of gas and liquid in a space of complex geometry.
Keywords
multicomponent mixture, flow, mass transfer, phase transition, numerical calculation, drift current, sliding velocities of components, concentration distribution
Article Text (PDF, in Russian)
UDC 532.529.5
Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2024, no. 1, 1:15