SU1381352A1 - Apparatus for measuring liquid pressure - Google Patents

Abstract

Invention m. used to study the processes of fluid motion in a centrifugal field. The purpose of the invention is to expand the range and improve the accuracy of pressure measurement. The porous sample 4 under investigation is placed in the working chamber 3 formed by a radial groove in the cylindrical body 1 and the perforated lid 5 closed. Capillary glass tubes 7 are installed in the perforations, through which the liquid from the chamber 3 is centrifugally pushed off to the periphery to align pressure in them. The position of the meniscus in the tube 7, determined by the radial marks on the lid 5, characterizes the pressure developed into the vrash, the auxiliary tubes 7 and determines the pressure in the working chamber 3. 1 Cp f-ly, 3 ill. (L WITH 00 SA: СЛ 1чЭ

Description

FI.1

The invention relates to devices for studying liquid flow processes in a centrifugal field, primarily intended for studying the hydrodynamics of centrifugal devices, such as filter centrifuges, centrifugal liquid diffusers, and melt granulators, and can be used to demonstrate the magnitude of liquid pressure in a centrifugal field.

The aim of the invention is to expand the range and increase the accuracy of the pressure measurement.

FIG. 1 shows schematically the proposed device, a general view; in fig. 2 - the same section; in fig. 3 is a pressure distribution curve over the thickness of the filling of glass beads at the rotational speed (dots show the experimental pressure values obtained using the proposed device).

The device comprises a housing 1, an axial channel 2 for supplying the test liquid to the radial working chamber 3, in which the porous sample 4 is fixed. The working chamber 3 is closed from above with a lid 5. For ease of monitoring the liquid in the chamber 3, the lid 5 is made of Org-Istekla. On the cover 5 there are divisions 6. There are channels for pressure selection in the I different points of the cover 5 on the thickness of the working-: barrel zone. Capillary glass tubes 7 are installed in the channels. The latter are located by a radially free end to the axis of rotation. The fastening holes 8 are threaded to attach the device to the rotating assembly. For balancing the device at various fluid loads, a balancing unit 9 is provided.

The device works as follows.

The housing 1 is mounted on the rotating flange of the experimental setup, through which the test liquid is supplied, and is bolted. The fluid through channel 2 is sent to the working chamber 3. Due to the fact that chamber 3 has a small section, the fluid moves along it in a continuous flow, the slippage of fluid layers one relative to another in the tangential direction is absent. Due to the uniform supply of fluid, the velocity over the cross section of chamber 3 is almost the same; there are no stagnant and vortex zones. Thus, a uniform, linear, normally-directed liquid supply to the porous sample 4 to be tested is provided. This condition is important for modeling the hydrodynamic pattern in front of the porous sample 4 in a centrifugal field. In addition, due to such a flow along the working chamber 3, when the device rotates, the liquid follows the law of quasi-solid rotation.

Creating a uniform radial fluid flow improves accuracy.

0 determine the pressure by eliminating the disturbing effect of slippage and vortex formation in a liquid.

Under the action of overpressure in the working chamber 3, the fluid through the channels

5, the pressure is drawn down into the capillary tubes 7. A centrifugal force acts on the fluid in the tubes 7, throwing it to the periphery. An equilibrium of pressure in the working chamber 3 and the pressure created when the fluid rotates in the tubes 7 is established. Thus, the pressure in the working chamber 3 is determined by the pressure developed in the rotating tubes 7.

The position of the meniscus in tube 6 is determined in stroboscopic lighting with

5 using a microscope. The readings are measured on a scale of 6 on the lid 5 and the scale of the microscope.

The application of the proposed device allows simultaneous measurement of fluid pressure in a centrifugal field at several points with a fairly high degree of accuracy.

Claims (2)

1. A device for measuring the pressure 5 of a liquid, comprising a flat cylindrical body with an axial channel, having a radial groove on the upper front side connected to the axial channel, above which there is a cover made with openings and with a scale in the form of radial 0 marks on its outer surface, balancing and fastening assemblies, characterized in that, in order to expand the range and increase the accuracy of pressure measurement, the lid is perforated in it, and each perforation hole is equipped with a capillary tube, one end of which is connected to the radial groove and the other end is parallel to outer surface in the direction of the axis of the housing. 0, 2. A device according to claim 1, characterized in that the radial groove of the housing is made in it of a rectangular cross section.