Research the Acoustic Cloth Drying Process in Mock-Up of Drum-Type Washing Machine

Khmelev, Vladimir N.; Savin, I. Yu.; Abramenko, Denis S.; Tsyganok, Sergey N.; Barsukov, Roman V.; Лебедев, А.Н.

doi:10.1109/sibedm.2006.230968

Cited by 10 publications

(3 citation statements)

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“…As drum-type convective chambers are wide spread [2], we decided to conduct researches on the base of the construction simulating the working volume of such dryers.…”

Section: Theory Of Ultrasonic Dryingmentioning

confidence: 99%

Research and development of ultrasonic device prototype for intensification of drying process

Khmelev

Barsukov

Abramenko

et al. 2008

2008 9th International Workshop and Tutorials on Electron Devices and Materials

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In the article theory of ultrasonic drying is stated. The possibility of ultrasonic field creation with intensity about 150 dB by means of disk radiators in closed volume of drying chambers is considered. The prototype of ultrasonic dryer for carrying out experiments on various drying materials is described; results of preliminary experiments on drying of gelatin, peas, fabric and carrots are presented.

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“…As drum-type convective chambers are wide spread [2], we decided to conduct researches on the base of the construction simulating the working volume of such dryers.…”

Section: Theory Of Ultrasonic Dryingmentioning

confidence: 99%

Research and development of ultrasonic device prototype for intensification of drying process

Khmelev

Barsukov

Abramenko

et al. 2008

2008 9th International Workshop and Tutorials on Electron Devices and Materials

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“…Однако из-за негативного влияния на человека высоких уровней звукового давления и отсутствия эффективных акустических излучателей этот вид сушки не получил широкого промышленного распространения. В этой связи целесообразным является проведение исследований процесса сушки в безопасном для человека ультразвуковом диапазоне частот (более 20 кГц) [3].…”

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Research of the Ultrasonic Drying Process of Various Materials

Khmelev¹,

Shalunov²,

Нестеров³

et al. 2021

Южно-Сибирский Научный Вестник

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В статье рассматривается процесс конвективной сушки тканых материалов и продуктов растительного происхождения. Показано, что длительность процесса может быть уменьшена за счет дополнительного воздействия ультразвуковыми колебаниями высокой интенсивности. Для определения ускорения процесса сушки ультразвуковыми колебаниями были разработаны лабораторные установки, позволяющие организовать комбинированное воздействие потока теплого воздуха и ультразвуковых колебаний. Комбинированная сушка ткани проводилась при трех различных температурах сушильного агента. Было установлено, что сокращение времени процесса по сравнению с конвективной сушкой зависит от температуры сушильного агента и составляет от 10% при температуре 40 0C до 20% при температуре 60 0C. В свою очередь, сушка овощей проводилась на резонансных промежутках от излучающего диска, при этом овощи нарезались толщиной 5 мм и располагались тонкими слоями. Комбинированная сушка моркови и картофеля позволила достичь сокращения времени сушки на 45-47%. При этом затраты на электроэнергию для ультразвукового аппарата составляют не более 30% от затрат на конвективную сушку. В результате проведенной работы была показана эффективность применения комбинированной ультразвуковой и конвективной сушки прежде всего для обезвоживания овощей, тогда как для ткани эффект не столь очевиден. Лабораторные исследования проводились при малом объеме высушиваемого материала, из-за слабого проникновения ультразвуковых колебаний на большую глубину, поэтому дальнейшие исследования необходимо направить на разработку полупромышленных и промышленных сушильных аппаратов для ультразвуковой сушки овощей и других термолабильных материалов. The article deals with the process of convective drying of fabrics and vegetables. The duration of the process can be reduced by additional exposure to high-intensity ultrasonic vibrations. To carry out drying, laboratory installations were developed that allow organizing the combined effect of a stream of warm air and ultrasonic vibrations. The combined drying of the fabric was carried out at three different temperatures of the drying agent and it was noted that the greatest reduction in drying time compared to convective drying was achieved at a temperature of 60 ° C. Although the overall reduction in drying time ranged from 10% to 20% depending on the temperature of the air flow. Drying of vegetables was carried out at resonance intervals from the emitting disk, while vegetables were cut 5 mm thick and placed in thin layers. Combined drying of carrots and potatoes made it possible to achieve a reduction in drying time of 45-47%. In this case, the cost of electricity for the ultrasonic apparatus is a small part of the cost of convective drying. As a result of the work carried out, it is possible to draw conclusions about the effectiveness of the use of combined ultrasonic and convective drying for dehydration of vegetables, while the effect is not so obvious for tissue. Laboratory studies were carried out with a small volume of dried material, due to the weak penetration of ultrasonic vibrations to a great depth, therefore, further research should be directed to the development of semi-industrial and industrial dryers for ultrasonic drying of vegetables and other heat-sensitive materials.

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“…If the oscillation frequency is larger than 20 kHz, it generates ultrasonic waves that propagate through its surrounding media [12, 16]. Coming to the studies reported on ultrasonic cloth drying per se, to our knowledge, Khmelev et al [17,18] is the only paper on this topic. However, a non-contact technique was used in their study, making our study unique and the first of its kind.This study will address the feasibility of adopting the ultrasonic technique for cloth drying with the objective of achieving lower power consumption and process duration compared to the existing energy-intensive, thermal-based clothes dryers.…”

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confidence: 99%

The Study of Fabric Drying Using Direct-Contact Ultrasonic Vibration

Peng¹,

Moghaddam²

2020

Current Drying Processes

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Our existing cloth drying technology is an energy-intensive process, which generally involves blowing hot air across tumbling wet fabrics to facilitate evaporation and moisture removal. To address the relatively low energy efficiency of existing cloth drying techniques, in this chapter, a totally new cloth drying technology is introduced, which uses high frequency ultrasonic vibrations generated by piezoelectric transducer instead of thermal heating to extract moisture in cloth as a cold mist, dramatically reducing drying time and energy consumption. The physical mechanism of ultrasonic fabric drying process in direct-contact mode is first studied. A novel ultrasonic transducer driving method, in which the power supply to the transducer is regulated by a binary modulating signal, is then developed for use in direct-contact ultrasonic drying of fabrics. A demonstration unit is finally fabricated to show the efficacy of the process and its energy saving compared to thermal drying process. 2 dryer technologies [3, 5-10] (including heat, heat pump, vacuum, or microwave drying) requires a heat source to provide a latent heat of evaporation of about 2.5 MJ/kg water. The heat source for a dryer can be electric resistance, natural gas and/or an electric heat pump.The metrics to measure the drying efficiency of a clothes dryer is called energy factor (EF), which commonly has three different types of definitions, depending on how the drying effect is qualified: (1) the mass of moisture removed per energy consumption; (2) the mass of cloth dried per energy consumption; or (3) the latent heat of moisture removed per energy consumption. In the United States, the Department of Energy standard of EF measures the mass of cloth (saturated to certain water content) that can be dried per unit of electricity consumed (lb/kWh) [3]. For gas dryers, it measures the pounds of clothes being dried per equivalent kilowatt-hour of natural gas consumed. Here, we focus on EF (lb/kWh) which is commonly used in the United States. Table 1 summarizes the EF values for the typical types of existing clothes dryers.Recently, for the first time, we have introduced a totally new cloth drying technology and are collaborating with Oak Ridge National Laboratory (ORNL) researchers to develop the world's first direct-contact ultrasonic cloth dryer that could potentially change the concept of residential heat-drying technology [11][12][13][14][15]. This novel approach uses high-frequency mechanical vibrations generated by piezoelectric ceramics instead of heat to extract moisture as a cold mist, dramatically reducing drying time and energy use. On the basis of inverse piezoelectric effect, when an electric field is applied in the polarization direction of piezoelectric ceramics, the ceramics will produce mechanical deformation in a certain direction. When a high frequency electric field is applied, the piezoelectric transducer generates acoustic vibration. If the oscillation frequency is larger than 20 kHz, it generates ultrasonic waves that propagate throu...

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Research the Acoustic Cloth Drying Process in Mock-Up of Drum-Type Washing Machine

Cited by 10 publications

References 1 publication

Research and development of ultrasonic device prototype for intensification of drying process

Research and development of ultrasonic device prototype for intensification of drying process

Research of the Ultrasonic Drying Process of Various Materials

The Study of Fabric Drying Using Direct-Contact Ultrasonic Vibration

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