Институт теоретической и прикладной механики СО РАН

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Acoustic Drying of Materials

At acoustic drying moisture is extracted from the dried material by a sound with appropriate characteristics. In comparison to traditional heat method acoustic drying does not need to raise temperature of the dried material. It is significant for some materials of vital importance in man's life. Grain after heating loses important biological properties and can be used only as grain forage. Wood buckles and cracks, medical bio-preparations decompose etc.

Acoustic method allows one to dry a great number of materials: agricultural products (grain, vegetables, fruit and others), wood, cotton, medical preparations and herbs, paper, chemical products and products of other branches of industry.

A series of experiments on acoustic drying of many materials was performed. The analysis showed that, in particular, germination of grain did not become worse after acoustic drying. Small-scale model of a drying chamber was manufactured. Experiments performed made it possible to estimate economic indices of the suggested method. The most important one is power consumption in drying.

WHEAT. To decrease moisture of 1 ton of grain from 20 % to 14 % it is necessary to consume 150 kWt h of electric power using a traditional method. According to acoustic method it is necessary to use 50-100 kWt h.

WOOD. To decrease moisture in 1 cubic meter of lumber at traditional vapor method of drying it is necessary to use 500 kWt h of power and more depending on conditions. According to acoustic method 100-200 kWt h are necessary. Time expenditures of a traditional method are by 5-10 times more than those of the acoustic one.

A compressor providing pressure of the compressed air of 5-6 atm is necessary to supply a source of sound. This amount of air consumption depends on the output of a drier. For a grain drier with the output of 2-5 t/h or wood with the output of 3000 cubic meter per year a compressor production should be 30-40 normal cubic meter per minute.

Dryers designs are very simple in comparison to the traditional ones; their cost will be several times lower than that of the traditional ones. Their design is according to module principle. The output of a base module for grain and wood drying is mentioned above.

Advantages of the suggested technology:

  • Higher quality and output of the market product caused by the absence of heating in a drying process.
  • Lower power consumption in the operation of dryers.
  • Lower capital outlays ( costs) for dryers production.

Acoustic dryers have a number of additional advantages. They are easily scaled which makes it possible to use them on different industrial scale (drying grain in elevators and farms). They are fire-safe, do not need a special room, they may be assembled in any store-houses and designed as a portable variant. They can be paid off during 1-2 years due to difference of power consumption.

Commercial Offer:

Search for an investor to organize a production of acoustic dryers, buyers and providing services to realize developments.

Developments are protected by RF patents


Khristianovich Institute of Theoretical and Applied Mechanics SB RAS

Institutskaya str., 4/1, Novosibirsk 630090, Russia

Tel: (383) 330-34-30; fax: (383) 330-72-68,

Dr. Phys.-Math. Glaznev Vladimir Nikolaevich

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