Steady and unsteady simulations for annular internal condensing flows, part I: Algorithm and its accuracy

• Published in: Numerical heat transfer. Part B, Fundamentals Vol. 69; no. 6; pp. 473 - 494
• Main Authors: Naik, Ranjeeth, Narain, Amitabh, Mitra, Soumya
• Format: Journal Article
• Language: English
• Published: Philadelphia Taylor & Francis 02.06.2016; Taylor & Francis Ltd
• Subjects: Adiabatic flow; Algorithms; Annular; Computer simulation; Condensation; Heat transfer; Laminar; Mathematical analysis; Mathematical models
• ISSN: 1040-7790; 1521-0626
• DOI: 10.1080/10407790.2016.1138802

This paper presents an algorithm for accurately solving the full two-dimensional governing equations, along with the interface conditions that govern laminar/laminar annular/stratified internal condensing flows. The simulation approach - which can be generalized to adiabatic and evaporating flows, a 3-D level-set technique, and so on - uses a sharp-interface model, separate liquid and vapor domain computational solutions with interface conditions embedded as boundary conditions, and a moving grid technique to locate the dynamic wavy interface (in amplitude and phase) by a method of characteristics solution of the interface tracking equation. The moving grid is spatially fixed for a defined number of instants, but changes when the current marker instant advances in time.