Тези доповідей, матеріали конференцій
Постійне посилання на розділhttps://dspace.nuft.edu.ua/handle/123456789/7373
Переглянути
5 результатів
Результати пошуку
Документ Determination of the ejection coefficient of a jet apparatus with a conical-cylindrical mixing chamber(2023) Tymchenko, Ivan; Ponomarenko, Vitalii; Lementar, Sviatoslav; Yakobchuk, Roman; Liulka, DmytroEjectors have found wide application in various industries due to their simplicity, unpretentiousness to operating conditions, absence of tribological problems, etc. Their main drawback is related to the low efficiency, which is at the level of about 30%. The need to improve operational characteristics led to the creation of an innovative ejector with a combined mixing chamber (initial conical and subsequent cylindrical parts). A mathematical model based on balance equations is proposed for the possibility of determining the ejection coefficient (the main flow rate characteristic) when designing or auditing equipmentДокумент Liquid jet gas ejectors: designs of motive nozzles, performance efficiency(2019) Ponomarenko, Vitaliy; Dimitrov, Tsvetan; Sliusenko, Andrii; Liulka, Dmytro; Forostiuk, InnaДокумент The extracting of saccharose from the beet cossettes of different types(2016) Lulka, Alexander; Mironchuk, Valeriy; Liulka, DmytroДосліджено процес екстрагування сахарози з бурякової стружки різних поперечних перерізів. Від профілю стружки залежать її якість, механічні характеристики, втрати сахарози в жомі, якість екстракту та енергетичні витрати.Документ The research of a one-step and two-step ejector with a compact and dispersed jet of liquid(2017) Ponomarenko, Vitaliy; Liulka, Dmytro; Dimitrov, Tsvetan; Lementar, Sviatoslav; Khitriy, Yaroslav; Perekrest, NataliThe work of the jet sulphitator ejector of sugar production is analyzed. The tests of a gas-liquid ejector with a compact and dispersed liquid jet in a wide range of changes in geometric characteristics (1.3 ... 11.25) were tested on the test-bench at the laboratory and the range of their optimal values (4 ... 7), which allowed to reach the maximum ejection coefficient, was found experimentally. The ejection coefficient for an ejector with a compact liquid jet is 15 ... 20% lower than for an ejector with a dispersed jet at the same flow rates.The design of a new two-stage ejector with improved expendable characteristics is offered, the basic geometric dimensions are justified. An increase of the ejection coefficient without additional energy penalties is experimentally proved. The field of application of the offered design ejector is not limited to food industry and it is recommended to use in those cases where heat-mass transfer processes take place.Документ Modernising of the columned diffusive device(2013) Pushanko, Mykola; Ponomarenko, Vitaliy; Liulka, DmytroIn sugar-refinery industry, the columned pullers, which consist of a diffusive column and cossette mixer, are widely used to derive of diffusive juice. The diffusive column consists of a vertical cylindrical case with hollow pipe shaft plac in it a not from the outside of which lobes are tighten. Lobes and counterlobes create a lifting mechanism for a swaft that comes from below the columned device through the distributive gear that turns together with pipe shaft over a strainer surface. From above the sugarfree beet swaft moves through the special unloading device. The fluid for sucrose extraction comes from upper part of columned puller and is collected from below through a strainer surface. Deficiency of such diffusive device is that despite big metal consumption of the device considerable part of is doesn’t participate in diffusive process (approximately 1/3 volumes of the device is occupied by the hollow shaft). Besides as a result of operation of a body loading force, there is considerable pressure on the upper leg of hollow pipe shaft that reduces operation time of the upper basic node, and consequently the reliability of device maintenance. In the fundamentals of our work is the problem of increasing specific duty of the device, making operations more reliable and lowering specific metal consumption at the expense of using internal space of pipe shaft with firmware transport system at which puller becomes double-thread. The upgraded columned diffusive device consistes of a vertical cylindrical case with counterlobes and mobile pipe shaft plac inside it and attached lobes. Outside it from above there is a cylindrical case for unloading and below the device for bagasse. It is agreed to put fix vertical strut with the counterlobes attach to it in side pipe shaft, and place pipe shaft lobes outside it for transportation of juice chips mixtures in the heel of pipe shaft that is connected by ports with the distributive gear of juice chips mixtures plac. As a result of using the offer engineering decision, the capacity of a puller increases greatly (to one third) at the same sizes of apparatus and increasing reliability of device operation owing to the reduction of the load to the upper basic node.