Abstract
The assessment of the temperature factor influence on the pressure pipeline hydraulic operation mode is very relevant, since it is considered primarily as an opportunity to reduce the cost of mechanical water transportation. Smaller pressure pipe hydraulic resistances save the electrical energy consumption, and the temperature factor has an additional positive effect on the energy saving process. The purpose of the research is to identify the nature of changes in the hydraulic friction value in relation to the temperature conditions of the transferred water temperature and environmental conditions in the designed ranges, with the subsequent possible control of the transportation process with minimum electrical energy consumption. The method of achieving these goals is an experimental and analytical approach aimed at determining the dynamics of changes in the hydraulic parameters of pipelines made of various materials. The tasks of experimental bench studies include the development of a method for calculating the values of hydraulic friction coefficients for pressure pipelines. The results of hydraulic experiments and comprehensive analysis of the experimental and calculated data for determining the hydraulic friction coefficients for polyethylene pipe are presented. The calculated values of the hydraulic friction coefficient were compared with the experimental ones, which enabled identification of their sufficiently high convergence. The conclusions show a positive effect of reducing hydraulic resistances depending on the increase in the temperature of the transported water.
Highlights
The strength and hydraulic parameters [1] should be considered as the basic ones when selecting the piping material for designing of construction and repair works on pressure engineering pipelines
A special role of the hydraulic component is assigned to the choice of the repair materials for pipes and protective coatings during trenchless renovation of pressure pipelines [3]
It is possible to simulate various fluid flow modes, including thermal modes, with the search for new dependencies for determining the values of the hydraulic friction coefficient, provided that the limiting ranges for a number of parameters are observed [10]
Summary
The strength and hydraulic parameters [1] should be considered as the basic ones when selecting the piping material for designing of construction and repair works on pressure engineering pipelines. The basic condition for determining the hydraulic friction coefficient for any pipeline material is to conduct bench experimental studies [9]. It is possible to simulate various fluid flow modes, including thermal modes, with the search for new dependencies for determining the values of the hydraulic friction coefficient, provided that the limiting ranges for a number of parameters are observed [10]. The researchers welcome the symbiosis of experimental and analytical approaches to determining the dynamics and the ranges of changes in the flow individual hydraulic characteristics, in particular, the value of the hydraulic friction coefficient under different pipeline operating conditions [11,12,13]. Thereby, the main task of the present research has been adaptation of the methodology for calculating the hydraulic friction coefficients to the determination of the pipeline hydraulic parameters in wide ranges of water and environmental temperature changes
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