Experimental analysis on the behavior of water drops dispersed in oil within a centrifugal pump impeller

Autor(es)

Perissinotto, Rodolfo Marcilli ^[1] ; Verde, William Monte ^[2] ; Perles, Carlos Eduardo ^[2] ; Biazussi, Jorge Luiz ^[2] ; de Castro, Marcelo Souza ^[1] ; Bannwart, Antonio Carlos ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Sch Mech Engn, Mendeleyev St 200, Campinas, SP - Brazil

^[2] Univ Estadual Campinas, Ctr Petr Studies, Cora Coralina St 350, Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: EXPERIMENTAL THERMAL AND FLUID SCIENCE; v. 112, APR 1 2020.
• Citações Web of Science: 0

Resumo

This paper aims to investigate the behavior of water drops in a continuous oil medium inside a centrifugal pump impeller working at eight operational conditions (up to 1200 rpm and 2.8 m(3)/h) with two-phase liquid-liquid flows. Water-in-oil dispersions were produced with low water cuts of about 1% in volume, thus the dispersed phase became arranged as water drops. Experiments for pump performance and flow visualization were conducted using a high-speed camera and a pump prototype with a transparent shell. Flow images revealed that the large water drops usually deform, elongate, and break up into smaller ones, especially at high pump rotations and oil flow rates, while small water drops tend to keep their spherical geometry without deformations and fragmentations. A sample of drops were tracked and their equivalent diameters, residence times, and velocities were calculated. The tracking indicated that the water drops travel random trajectories in the channels, generally undergoing a deceleration along their pathway. Furthermore, the residence times and the average velocities of water drops strongly depend on the flow conditions. For the conditions tested, the water drops presented equivalent diameters between 0.1 and 5.0 mm, average velocities from 0.4 to 1.7 m/s, and residence times between 30 and 152 ms. For a more complete analysis, the results achieved in this study are constantly compared with results available in literature regarding oil drops in oil-in-water dispersions. (AU)

• Processo FAPESP: 17/15736-3 - Centro de Pesquisa em Engenharia em Reservatórios e Gerenciamento de Produção de Petróleo
• Beneficiário: Denis José Schiozer
• Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia