Oil-water bifasic flow in a bench scale experimental unit

Luiz Roberto Santini Melo, Deovaldo Moraes Junior, Aldo Ramos Santos

Abstract


The Core Annular Flow (CAF), oil duct transportation surrounded by a ring of water, is based on the natural principle of non-miscibility of fluids with different densities and viscosities. The constant need of transporting crude oil through extensive pipelines either from producing areas to refineries or harbour, has in the CAF an important ally that intends to reduce, with its appliance, the pumping costs compared nowadays. This job had as general objective to build an experimental unit to study of the oil-water two-phase flow. As a specific objective aimed to determine, in bench scale, the needed power to the motor pump set and the head loss in oil-water two phase flows with the formation of CAF patterns, visible without the aid of optical instruments. At the experiment were used: a) two regenerative pumps, driven by 1 hp and 2 hp electric motors, controlled by frequency inverters; b) acrylic gadget responsible for the formation of external ring of water in the oil; c) 1" diameter pipe and curves of transparent PVC; d) digital and analog pressure gauges; e) differential pressure piezometer; f) flow meter; g) orifice plate with pressure gauge in "U"; h) 30 liters acrylic box, with 1" Rasching rings; i) separation box in transparent acrylic with a capacity of 270 liters; g) Acrylic tank of 90 liters for water and another of 70 liters for oil. The CAF was obtained from water flow rates from 0.4 m³/h and oil from 0.59 m³/h, with a reduction of head loss of 24 times and power pump saves as low as 1.16 times.

Keyword

Biphasic flow, Core annular flow, Head loss, Required power.


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