Creation of conditions for optimal flow of Bingham media, such as ready-mixed concrete and mortar mixes, in the circular pipeline during delivery by various types of transporting equipment has not been sufficiently studied so far. Purpose: finding patterns of flow of concrete and mortar mixes in different sections of the pipeline, based on the variability of the viscosity coefficient when the medium is flowing through long circular pipes. In calculations of the flow capacity of mortar and concrete pipelines and the required power of the pumping equipment, the properties of concrete and mortar as Bingham media should be taken into account. Dependences for description of the operation process of flow of concrete and mortar mixes through circular pipelines have been found on the basis of the Buckingham equation in the laminar flow mode.Dependences of determination of flow rate and required power with continuous delivery of concrete and mortar mixes in the pipeline, as well in case of alternate inlet pressure variation are presented. Law of variation of μр can be obtained only experimentally, which also results in errors in the computation model.
При проектуванні гідравлічного приводу в яко-сті робочої схеми розподілу енергії від одного його джерела до споживачів прийнята індивідуаль-на схема. Теоретичні дослідження виконано на основі використання системного аналізу для гід-равлічного приводу з індивідуальною схемою роз-поділу енергії і послідовним підключенням двох її підсистем. Цими дослідженнями встановле-ні залежності для розрахунку та вибору параме-трів для насоса і гідродвигунів Ключові слова: привод гідравлічний, проекту-вання, система, потужність, коефіцієнт корис-ної дії, насос, гідроциліндр, гідромотор При проектировании гидравлического приво-да в качестве рабочей схемы распределения энер-гии от одного его источника до потребителей принята индивидуальная схема. Теоретические исследования выполнены на основе использования системного анализа для гидравлического привода с индивидуальной схемой распределения энергии и последовательным подключением двух ее подси-стем. Этими исследованиями установлены зави-симости для расчета и выбора параметров для насоса и гидродвигателей Ключевые слова: привод гидравлический, про-ектирование, система, мощность, коэффициент полезного действия, насос, гидроцилиндр, гидро-мотор UDC 621.225.2001.23
Currently, such types of engineering work as construction of classic buildings and structures, as well as erection of new ones that have an irregular shape, i.e. curved, arched, elliptical, round and similar surfaces, can be performed using complex technological equipment, such as combined external or internal formwork, the use of shotcrete technology together with the off-formwork construction technologies (3D printers). One of the prerequisites for uniform transportation of media by a concrete pump through pipelines, concrete conveying pipes, and most importantly, their homogeneous distribution by an extruder during layering, is a study based on mathematical modeling and comparative analysis of mathematical models of the flow of Shvedov-Bingham fluids in pipelines of various cross-sections, determining the performance, optimal rheological properties of mortars and concrete liquids. This will allow further control of their fluidity and plastic viscosity during the extrusion process.
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