Expansion of water supply system in Kotelva, Kotelevskyi Distr., Poltava Region (14500 inhabitants) with the study of the effect of eccentricity and aqueous solutions of metaupon and dithalan on the hydraulic resistance of a cylindrical rotor
Students Name: Miller Nazarii Olehovych
Qualification Level: magister
Speciality: Water Supply and Sewerage System
Institute: Institute of Civil Engineering and Building Systems
Mode of Study: full
Academic Year: 2022-2023 н.р.
Language of Defence: ukrainian
Abstract: The reconstruction of the combined economic-drinking industrial-fire protection ring water supply system of the village of Kotelva is planned [1]. The network is calculated for the maximum estimated cost, and the network is connected to the estimated cases. The source of the village’s water supply is underground water. Perfect wells were adopted: 2 working and 1 reserve, in which 8SDS100 Calpeda pumps are installed. Water needs iron removal. Iron removal is carried out by the method of "dry" filtering in pressure filters, disinfection - by bactericidal rays of mercury-quartz lamps. Next, the water enters the clean water tanks, from where the pumps of the pumping station of the second rise, in which 6 pumps are installed - 4 pumps of the NM 65/200 brand for supplying domestic and drinking water and 2 fire-fighting pumps of the NMS4 150/400 brand, are fed into the water supply network of the village. In many devices, a significant amount of energy is wasted when pumping liquids. Many studies have been conducted to reduce pressure losses by modifying the inner surface of the pipe or by adding additives to the fluid. Reduction of resistance with the help of high molecular weight polymers is known, because by adding parts per million of these applications, resistance can be significantly reduced (up to 70%), which leads to significant energy savings [2]. Flow in a pipe or channel is the most commonly used setup for quantifying drag reduction by pressure drop. This requires a significant amount of additives for laboratory testing and the degradation of the polymer is difficult to control. Taylor Couette flow retains similar characteristics and has been identified as a suitable alternative for this purpose [3]. Taylor Couette flow is fluid flow between two differentially rotating concentric cylinders and has the advantage of a closed geometry. In this way, you can constantly use a fixed amount of liquid and avoid the influence of the pump blades on the liquid, which accelerates its degradation. Surfactants have a strong potential to reduce drag, but they are not widely studied compared to high molecular weight polymers. Unlike polymers, surfactants have the advantage of being resistant to shear degradation in pumps and other high stress areas. These surfactants have the ability to self-heal, which gives them an advantage over polymers [4]. Similar to polymers, at minimum values of the Reynolds number, they demonstrate the phenomenon of a decrease in resistance. Beyond this Reynolds number, the drag reduction increases with increasing Reynolds number, but then decreases with increasing flow velocity due to the destruction of micelles at higher shear rates [5]. The reduction in resistance obtained in the case of the flow of surface-active substances can be higher than that of polymers [6]. Flows of water and aqueous solutions of metaupon with mass concentrations of 10-3, 5•10-3 kg/kg and dithalan with concentrations of 10-2 were studied; 8•10-2 kg/kg [7-11]. 7% of sodium chloride by weight of the solution was added to aqueous solutions of metaupon for thickening, and 0.2% of sodium bicarbonate by weight of the solution was added to stabilize it. In aqueous solutions of dithalan - 3% NaCl. Scope of research – the flow of aqueous solutions of surfactants between the rotor and the stator. Scope of research – methods and means for determining the effect of eccentricity and surfactants on the hydraulic resistance of a cylindrical rotor. Goal of research: experimental study of the effect of rotor eccentricity relative to the stator and surfactant applications (Metaupon OMT, Ditalan OTS-45) on the hydrodynamic resistance of the rotor. Research results 1. The dependence of hydrodynamic efficiency of aqueous solutions of metaupon and dithalan on concentration was confirmed. 2. A decrease in Cf with an increase in Re and Ta was confirmed for the investigated eccentricities both for water and for aqueous solutions of metaupon and dithalan. 3. The reduction of the relative change in the coefficient of friction for the concentration of an aqueous solution of metaupon of 0.5% compared to water was confirmed. For a metaupon concentration of 0.1%, the friction coefficient Cf decreased at small eccentricities, and increased at large eccentricities. 4. An increase in Cf was obtained for the studied concentrations of an aqueous solution of dithalan compared to water at an eccentricity other than zero at fixed values of Ta. Keywords: eccentric cylinders; rotor; coefficient of friction; torque; Reynolds number. References 1. DBN V. 2.5.-74:2013. Vodopostachannia. Zovnishni merezhi ta sporudy. Osnovni polozhennia proektuvannia. Ministerstvo rehionalnoho rozvytku, budivnytstva ta zhytlovo-komunalnoho hospodarstva Ukrainy, 2013. 2. Ptasinski, P. K., Nieuwstadt, F. T. 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