Spatial analisys of a perturbation wave in parallel two-phase flow.

• Grant number: 08/06922-9
• Support Opportunities: Scholarships in Brazil - Master
• Effective date (Start): March 01, 2009
• Effective date (End): June 30, 2010
• Field of knowledge: Engineering - Mechanical Engineering - Transport Phenomena
• Principal Investigator: Oscar Mauricio Hernandez Rodriguez
• Grantee: Marcelo Souza de Castro
• Host Institution: Escola de Engenharia de São Carlos (EESC). Universidade de São Paulo (USP). São Carlos , SP, Brazil

Abstract

In many natural and industrial processes one can observe multiphase flows. Considering only gas-liquid and liquid-liquid mixtures, a geometric configuration that frequently occurs is the separated flow patterns. It is formed by the annular and stratified flow patterns. The former have been suggested as profitable alternative for the transport and artificial elevation of highly viscous oils, and it's the most common flow pattern in refrigeration systems and in the production of gas. The latter is taken as a convenient way to avoid the formation of water-in-oil emulsions in pipelines and of common occurrence in directional oil wells. One notes that the development of more refined two-phase models is in order. The problem of the hydrodynamic stability of the parallel flow patterns along a long pipeline (oil and gas wells, risers and pipelines) is still a open question and it's not trivial, even when one takes a simple situation of isothermal flow. In this work the linear theory of the hydrodynamic stability will be applied; it supposes that flow pattern transition can be caused by instabilities that result from the spatial amplification of a perturbation wave in the interface of the two phases. In this context, this research's goal is to apply the one-dimensional approach to study the hydrodynamic stability of the stratified and annular two-phase flow patterns. A transition criterion based on a spatial analysis of the hydrodynamic stability will be developed. The criterion's predictions will have to be validated against data to be taken at the Thermal-Fluids Engineering Laboratory (NETeF) of the Engineering school of São Carlos (EESC - USP).

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

RODRIGUEZ, IARA H.; YAMAGUTI, HENRIQUE K. B.; DE CASTRO, MARCELO S.; DA SILVA, MARCO J.; RODRIGUEZ, OSCAR M. H.. Slip ratio in dispersed viscous oil-water pipe flow. EXPERIMENTAL THERMAL AND FLUID SCIENCE, v. 35, n. 1, p. 11-19, JAN 2011. (08/06922-9)

RODRIGUEZ, I. H.; YAMAGUTI, H. K. B.; DE CASTRO, M. S.; DA SILVA, M. J.; RODRIGUEZ, O. M. H.. Drag reduction phenomenon in viscous oil-water dispersed pipe flow: Experimental investigation and phenomenological modeling. AICHE JOURNAL, v. 58, n. 9, p. 2900-2910, SEP 2012. (08/06922-9)

DE CASTRO, MARCELO S.; PEREIRA, CLEBER C.; DOS SANTOS, JORGE N.; RODRIGUEZ, OSCAR M. H.. Geometrical and kinematic properties of interfacial waves in stratified oil-water flow in inclined pipe. EXPERIMENTAL THERMAL AND FLUID SCIENCE, v. 37, p. 171-178, FEB 2012. (10/03254-5, 08/06922-9)