A Hershaw box and its convective mixing experimental system

Abstract

The invention develops a Hershaw box and a convection mixing experimental system composed of it. The experiment system includes a CCD camera, a vertical Hershaw box, a surface light source and the like. Vertical Hershaw box, through the rotary switch, the lower fluid space is sealed and filled with low-density fluid, and the upper fluid space is filled with high-density fluid. A CCD camera, a vertical Hershaw box, and a surface light source were placed in a dark box. The rotary switch makes the arc surface of the rotating shaft rotate to the gap between two layers of parallel light-transmitting materials to seal the fluid in the lower layer. Fill the upper part of the Hershaw box with dense fluid. When the switch is turned on, the upper and lower fluids are in contact, and the density difference of the liquid-liquid two-phase fluid causes the convective mixing experiment to start, and at the same time, the CCD camera starts to shoot and record the images of the two-phase liquid convective mixing process. The experimental system is simple, easy to operate, and accurate in timing. It is suitable for follow-up research on characteristic parameters such as phase interface changes, fingering occurrence and development time, and number of fingerings in the convective mixing process.

Description

technical field [0001] The invention belongs to the technical field of multiphase flow, and relates to a Hershaw box and a convection mixing experimental system composed of the same. Background technique [0002] Convective mixing means that under certain conditions, the density of the upper fluid is greater than that of the lower fluid. Under the action of gravity, the upper fluid flows downward and the lower fluid flows upward, resulting in a convection process in the vertical direction and accelerating the mixing of the two-phase fluids. This phenomenon often occurs in seawater confluence and reflux, CO 2 In the process of saline aquifer storage and groundwater pollution treatment. [0003] The premise of convective mixing is that there are two fluids with different densities and the two fluids are vertically distributed in layers, and the upper layer is denser. This unconventional fluid distribution method makes it difficult to form the initial conditions of the convec...

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Problems solved by technology

[0004] The present invention provides a Hershaw box and a convective mixing experimental system composed of it to solve the problem that it is difficult to carry out relevant experimental measurements in the convective mixing process caused by the density difference of multiphase fluids in the existing method

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