THE STUDY ON THE IRREGULARITY OF WATER COLLECTION AND DISTRIBUTION BY POROUS PIPES IN FREE-FLOW WATER MOVEMENT
DOI:
https://doi.org/10.31650/2786-6696-2023-5-117-125Keywords:
porous pipe, free-flow movement, filters, collection (outflow) of water, hydraulic calculation.Abstract
One of the main utilities used to obtain drinking water in households and drinking water supply in towns are filters with drainage distribution and diversion systems in their main structural elements. The filters are equipped with porous pipes for distributing and collecting water to increase efficiency and reliability. Therefore, obtaining reliable methods for their calculation is of scientific and practical interest.
The article notes that water in distribution and collection pipelines moves with a variable flow rate along the way. Moreover, the inflow or outflow of water depends on the pressure variable along the length of the pipe. If the movement is free-flowing, it depends on the variable water level. While for porous pipes, this movement is continuous.
The subject of fluid moving with a variable flow rate has been studied by many authors; however, the dependences obtained in those cases mainly concerned perforated pipelines and open trays.
The authors study the operation of a porous pipe under the conditions of free-flow movement, which is described by two equations, the movement of fluid inside the pipe and the movement of fluid through the pipe's walls. The article indicates the complexity of this problem. Namely, the fact that these equations are interconnected. That is, the fluid flow through the pipe walls depends on the depth of the water layer in the pipe, which is determined by the equation of motion inside the pipe. Similarly, the law of depth change is defined, particularly by the laws of the inflow.
A mathematical model was obtained during the investigation of the uneven distribution and collection of water by a porous pipe. Based on this model, an approximate calculation method was developed, which makes it possible to get the value of the average flow depth in the pipe from the critical depth of water installed at the end of the pipe. To simplify the calculations, the article gives the corresponding nomograms.
The validation of the model was carried out on an experimental setup. The analysis of the experimental data showed good correspondence to the calculation results performed according to the approximate method, i. e. the deviation of the flow depth in the middle section does not exceed 1.5%.
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