Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
Displacement of Viscous Liquids by a Viscoplastic Material on Capillary Tubes
Submission Author:
Hilton Moulin Caliman , ES
Co-Authors:
Alan Victor Ferreira Modolo, Edson Soares, Roney Thompson
Presenter: Hilton Moulin Caliman
doi://10.26678/ABCM.ENCIT2016.CIT2016-0383
Abstract
The liquid-liquid displacement has been analysed since the pioneering work of Goldsmith & Mason (1963). This kind of problem has a number of practical applications as oil recovery in porous media and cementing of oil wells, in which the control of the liquid film attached to the wall is quite important. Considering two immiscible liquids, the physical mechanism is governed by the viscosity and density ratios, capillary number, Reynolds number, besides the rheological properties of each material. This work is a contribution on the understanding of the role played by viscoplastic materials in such phenomenon. In a simple experimental apparatus, a Carbopol solution is used to displace a Newtonian liquid in a capillary tube. The images of the interface are recorded during the test. From these images, we have the interface shape and the thickness of the displaced liquid attached to the wall as a function of a plastic number. By a simple volume balance, we also have a measure of the displacement efficiency. It is shown that the displacement efficiency and the liquid film attached to the wall are not directly related. In addition, instabilities were found along the length of the bubbles from the center through to the end. It was also observed that the displacement efficiency was greater than the equivalent Newtonian case, while the thickness of the displaced liquid attached to the wall was smaller. Finally it is shown that both parameters are lower than the equivalent Newtonian cases and they decrease with the increase of the plastic number.
Keywords
liquid-liquid displacement, capilary tube, Viscoplastic material, displacement efficiency
