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Acoustic field drying

Acoustic field drying
   Sonic ( including ultrasound ) field drying method can be used to dry and should not use hot dry materials. Waves can accelerate the drying process 1-2 times , out of this for some materials can shorten the drying time , for example, tumble drier acoustic field gluconate, only drying time 20-30min, and in conditions of industrial production the next goal up the drying process more than 8h .
    Study acoustic field drying process has two main directions : to find out the mechanism of acoustic field drying process and selection of optimal parameters ; drying device developed by the sound generator . According to modern concepts , the elastic vibration energy can strengthen external and internal mass transfer . Is a major determinant of energy levels , when the acoustic intensity is less than 143-145dB (0.02 a L 32W/cm2) , the process will accelerate .
    Experimental study the interaction between sound waves and solid high intensity acoustic wave field generated in flow velocity that this rate is large ( sound intensity 167dB , the sound velocity of 6m / s), which could be envisaged : the role of the acoustic stream of solid Bu the fluid boundary layer on the surface is damaged, thereby strengthening the external mass .
    When the sound source stronger economic and operating conditions permit, the acoustic field drying method is promising . Drying radiator main form , the acoustic energy into a kinetic energy of the air radiator . Former Soviet Union, holding style radiator airflow has been used for drying materials and other process purposes. The device includes a nozzle and a resonance chamber . Resonant chamber fixed to the rod. The rod through the nozzle axis , spoon sleeve connection , the air will be passed by the connector and into the bore nozzle . Under the action of the parabolic reflector , the acoustic energy to establish a mud flow , the hole in the reflector for adjusting the amount of air entering the drying chamber , and in a certain tuning , the radiator area may occur for the delivery of air to and able to work . 180m3 per hour required radiator air ( standard state ) . And work under pressure 0.35MPa . In this case, acoustic power is 500w, efficiency of 18% to 20% .
    During the drying process the use of acoustic energy , the cost is relatively large, because the compressed air required costly , inefficient radiators , need auxiliary means to reduce noise in the workplace . In addition, consideration should be given to the acoustic characteristics of the material itself , and to conduct a preliminary study in the laboratory , in order to enliven the feasibility of utilization . Although generally not improve acoustic field drying temperature, but will encounter strong suction units of material, and the heat inevitably make . Does not exclude the use of the existing air drying apparatus towel radiator possibility , and this drying device at higher pressure and larger gas consumption [ 100m3 / h ( standard state ) or more ] the supply of air through the air radiation is fed into the drying device , in many cases you can get very good economic results.
    During the drying process the use of acoustic energy life , the cost is relatively large, because the cost of compressed air needed who inefficient radiators , need auxiliary means to reduce noise in the workplace . In addition, consideration should be given to the acoustic characteristics of the material itself , and to conduct a preliminary study in the laboratory , in order to enliven the feasibility of utilization . Although generally not improve acoustic field drying temperature, but will encounter strong suction units of material, and the heat inevitably make . Does not exclude the use of the existing air drying apparatus towel radiator possibility , and this drying device at higher pressure and larger gas consumption [ 100m3 / h ( standard state ) or more ] the supply of air through the air radiation is fed into the drying device , in many cases you can get very good economic results.

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