Abstract
This paper is concerned with a method to measure the liquid level by purging a liquid through a system of capillary tubes.
For a steady and laminar flow of a liquid through a capillary tube, the ratio of pressure drops of two parts of the tube is determined by the geometrical dimensions of both parts.
This fact enables us to know the pressure at one end of a capillary tube in a liquid by the pressure measurement at two points of the tube. When the pressure of the liquid at a point and the density of the liquid are known, the depth of the point from the level can be obtained. This is the principle of method of measurement of liquid level by liquid purge.
Results of some experiments agree fairly well with the directly measured liquid levels.
