Journal of Engineering Sciences / Журнал інженерних наук

Permanent URI for this collectionhttps://devessuir.sumdu.edu.ua/handle/123456789/34326

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    Regeneration of chromate galvanic solutions in membrane electrochemical devices
    (Sumy State University, 2022) Сердюк, Василь Олексійович; Сердюк, Василий Алексеевич; Serdyuk, Vasil OleksIyovich; Склабінський, Всеволод Іванович; Склабинский, Всеволод Иванович; Sklabinskyi, Vsevolod Ivanovych; Большаніна, Світлана Борисівна; Большанина, Светлана Борисовна; Bolshanina, Svitlana Borysivna; Ochowiak, M.; Radchenko, A.; Babenko, O.; Kharchenko, Y.
    The regeneration processes of industry technological passivating baths of electrochemical cadmium lines and electrochemical galvanizing lines as an applied result of two-chamber membrane cation-exchange electrochemical devices researched. Actual industrial passivation baths of cadmium and zinc galvanic coatings applied as anode chambers. The cathode chamber contained sulfuric acid 1 % solution and a titanium cathode (BT-0). A window was cut in one of the walls with a RALEX®CM-PES 11-66 cation exchange membrane placed in it. The lead (С-0) was used as the anode. A comparative analysis of the performance of these technological baths before and after the using cation exchange membrane electrochemical devices was carried out. As a result of long-term experimental studies, the ecological and economic feasibility of their use was proven.
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    Rational choice of a basket for the rotational vibropriller
    (Sumy State University, 2022) Юрченко, Олександр Юрійович; Юрченко, Александр Юрьевич; Yurchenko, Oleksandr Yuriiovych; Склабінський, Всеволод Іванович; Склабинский, Всеволод Иванович; Sklabinskyi, Vsevolod Ivanovych; Ochowiak, M.; Острога, Руслан Олексійович; Острога, Руслан Алексеевич; Ostroha, Ruslan Oleksiiovych; Гусак, Олександр Григорович; Гусак, Александр Григорьевич; Husak, Oleksandr Hryhorovych
    The use of processing units for the production of mineral fertilizers in the industry in today’s market requires improved product quality and increased productivity. As a result, there is a need to change the design of existing units or some structural elements. Rotary vibroprillers, having a relatively simple design, can be of different designs that directly affect the productivity indicators mentioned above. The study considers the influence of the shape of the basket bottom on the quality of the rotational vibroprillers. After using the governing equation of prills motion in the airflow, a program was developed for automatic control of the rotational speed of the priller based on changes in melt loads. It is established that the size of the spray swath can be changed by varying the rotational speed of the priller. There is a tendency to affect the vibropriller performance by controlling the rotational speed and shape of the basket bottom without performance degradation.
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    Аn experimental study of heat and mass transfer in a falling liquid film evaporation into a cross flow of a neutral gas
    (Sumy State University, 2020) Лукашов, Володимир Костянтинович; Лукашов, Владимир Константинович; Lukashov, Volodymyr Kostiantynovych; Kostiuchenko, Y.V.; Timofeev, S.V.; Ochowiak, M.
    The work is devoted to the study of heat and mass transfer in a liquid film flowing down on a heated surface under conditions of evaporation into a crossflow of a gas neutral with respect to the liquid. The work aimed to experimentally determine the average heat transfer coefficients from a heated surface to the film, heat transfer and mass transfer from the film to the gas flow and to establish their dependence on the input parameters of the heat and mass transfer process. To achieve this goal, an experimental setup was created, and a research technique was developed based on the proposed mathematical model of the heat and mass transfer process. The results of the study showed that the dependences of the average heat and mass transfer coefficients on the initial liquid flow rate are extreme with the minimum values of these coefficients at the liquid flow rate, which corresponds to the critical value of the Reynolds criterion Re l cr ≈ 500, which indicates a transition from the laminar falling films to turbulent mode under the considered conditions. The dependences of the heat and mass transfer coefficients on other process parameters for both modes of film falling are established. A generalization of the experimental data made it possible to obtain empirical equations for calculating these coefficients.
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    Intensification of Foam Layered Apparatus by Foam Stabilization
    (Sumy State University, 2018) Ляпощенко, Олександр Олександрович; Ляпощенко, Александр Александрович; Liaposhchenko, Oleksandr Oleksandrovych; Khukhryanskiy, O.; Moiseev, V.; Ochowiak, M.; Manoilo, Е.
    У роботі досліджувалися укрупнені моделі пінних апаратів з гратками, зібраними з трубок різного діаметра. Розглядаються питання інтенсифікації пінних апаратів із застосуванням крупнодірчастих граток. Відзначена можливість глибокого очищення і практично повного очищення газів від аміаку і фтористих з’єднань при їх роздільній абсорбції. Наведено ряд експериментальних залежностей основних параметрів процесу. Підтверджена можливість ефективного проведення масообміних процесів в інтенсивному пінному шарі на протитечійних крупнодірчастих гратках.