Device and method for measuring ultra-low interfacial tension by rotary liquid drop process

Abstract

The invention relates to a device and a method for measuring tension, in particular to a device for measuring ultra-low interfacial tension by a rotary liquid drop process, and belongs to the field of high-temperature and high-pressure surface tension. The device comprises a high-temperature and high-pressure rotary transmission device, a high-temperature and high-pressure sealing and control device and an optical observation device, wherein the rotary transmission device comprises a quartz test sample tube griped by a metal rotary body; the rotary body is erected between ceramic bearings, and one end of the rotary body is connected with the output shaft of a driving motor by a rare-earth coupler; the high-temperature and high-pressure sealing and control device comprises a stainless steel sealing cabin body of which both sides are provided with observation windows; one end of the cabin body is connected with the rare-earth coupler, and the other end of the cabin body wraps the rotary transmission device; a heat-insulating protective layer is coated on the outer surface of the cabin body; an electric heating rod and a temperature and pressure sensor are arranged in the cabin body; a high-pressure gas inlet, a pressure control regulating valve and a water bath temperature reduction control inlet are formed on the cabin body; and the optical observation device comprises the observation windows, a light source arranged outside the observation window on one side and an optical lens and a charge coupled device (CCD) photosensitive image sensor which are arranged outside the observation window on the opposite side.

Description

technical field [0001] The invention relates to a tension measuring device and a measuring method, in particular to a measuring device and a measuring method for measuring ultra-low interfacial tension by using a rotating droplet method under high temperature and high pressure conditions. Background technique [0002] The rotating droplet method is one of the methods for measuring surface tension, which was first developed by Bernard Vonnegut in 1942 (B. Vonnegut, Rev. Sci. Instrum. 13(6)(1942) 6-9). A less dense droplet is placed in a denser liquid, which is measured in a rotating horizontal tube. The rotation of the horizontal tube creates a centrifugal force against the tube wall, at which point the intermediate droplet will elongate, and stop elongation when the interfacial tension and centrifugal force are balanced. The numerically calculated equilibrium point is then used to estimate the surface tension of the relevant liquid, a method known as "spinning drop tension"...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a rotating droplet method ultra-low interfacial tension measurement device and measurement method, so as to solve the defect that relevant measurement cannot be carried out under high temperature and high pressure conditions

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