From Chemistry Towards Technology Step-By-Step From Chemistry Towards Technology Step-By-Step От химии к технологии шаг за шагом 2782-1900 82941 10.52957/27821900_2021_02_178 Научные статьи Scientific articles Научные статьи Laboratory and semi-industrial ultrasonic dryers Laboratory and semi-industrial ultrasonic dryers https://orcid.org/0000-0002-6989-9769 Терентьев Сергей А. Terentiev Sergey A. sergey@bti.secna.ru https://orcid.org/0000-0002-5299-9931 Шалунов Андрей Викторович Shalunov Andrey V. https://orcid.org/0000-0001-7089-3578 Хмелев Владимир Николаевич Khmelev Vladimir N. https://orcid.org/0000-0002-6140-5699 Нестеров Виктор Александрович Nesterov Viktor A. https://orcid.org/0000-0002-7708-0665 Голых Роман Николаевич Golykh Roman N. Бийский технологический институт (филиал) ФГБОУ ВО «Алтайский государственный технический университет им. И.И. Ползунова» Бийск Россия Biysk Technological Institute (branch) of the Altay State Technical University Biysk Russian Federation Бийский технологический институт (филиал) ФГБОУ ВО «Алтайский государственный технический университет им. И.И. Ползунова» Бийск Россия Biysk Technological Institute (branch) of the Altay State Technical University Biysk Russian Federation Бийский технологический институт (филиал) ФГБОУ ВО «Алтайский государственный технический университет им. И.И. Ползунова» Бийск Россия Biysk Technological Institute (branch) of the Altay State Technical University Biysk Russian Federation Бийский технологический институт (филиал) ФГБОУ ВО «Алтайский государственный технический университет им. И.И. Ползунова» Бийск Россия Biysk Technological Institute (branch) of the Altay State Technical University Biysk Russian Federation Бийский технологический институт (филиал) ФГБОУ ВО «Алтайский государственный технический университет им. И.И. Ползунова» Бийск Россия Biysk Technological Institute (branch) of the Altay State Technical University Biysk Russian Federation 23 06 2021 23 06 2021 2 2 178 186 04 05 2021 08 06 2021 https://chemintech.ru/en/nauka/article/82941/view

The paper deals with the process of convective drying of materials using potatoes as an example at 60 C. To intensify the drying process, non-contact ultrasound with different acoustic pressure levels in the range 130-175 dB was applied. Ultrasonic drying at175 dB reduced the drying time of potatoes by 57.1%to compare with the convection drying. We observed a step change of drying speed during the initial phase (at high moisture content) at acoustic pressure level of 150 dB. It allows to predict the activation of dehydration mechanism without a phase change, i.e., by dispersing moisture from the surface of the material to be dried. To verify the dispersion mechanism, we captured water droplets with the immersion liquid slide. The number of dispersed droplets decreased along with decreasing of material moisture content. The optimum of acoustic pressure level is 160-165 dB range in terms of reduced drying time and energy consumption. Two drum-type dryer designs have been proposed to increase the mass of material being dried at the same time. Ultrasonic drying (160-165 dB) of diced potatoes by these units was 45-47% faster than convection drying.

The paper deals with the process of convective drying of materials using potatoes as an example at 60 C. To intensify the drying process, non-contact ultrasound with different acoustic pressure levels in the range 130-175 dB was applied. Ultrasonic drying at175 dB reduced the drying time of potatoes by 57.1%to compare with the convection drying. We observed a step change of drying speed during the initial phase (at high moisture content) at acoustic pressure level of 150 dB. It allows to predict the activation of dehydration mechanism without a phase change, i.e., by dispersing moisture from the surface of the material to be dried. To verify the dispersion mechanism, we captured water droplets with the immersion liquid slide. The number of dispersed droplets decreased along with decreasing of material moisture content. The optimum of acoustic pressure level is 160-165 dB range in terms of reduced drying time and energy consumption. Two drum-type dryer designs have been proposed to increase the mass of material being dried at the same time. Ultrasonic drying (160-165 dB) of diced potatoes by these units was 45-47% faster than convection drying.

 acoustic pressure level drying dispersing ultrasonic dryer drying curve

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