Abstract
The use of ultrasonic (US) force field to aid both air-
and liquid-based separation processes has gained an
increasing recognition in recent years. The advantages
expected from using US for separation processes include
higher liquid removal rate, higher dry matter content in
product, lower processing temperature, maintenance of
product integrity, more selective product, and higher
product recovery. In general, the passing of ultrasonic
waves using suitable high intensity through air or liquid
is accomplished by primary phenomena such as cavitation,
radiation pressure, and secondary phenomena of a
physicochemical nature such as dispersion, coagulation,
and change in liquid properties. Only some US industrial
separation applications, which are worth mentioning, are
powder screens, cell separators, CERTUS-, Sofi-,
Fractor-, Fuji- and Scamsonic-screening filters and
Outotec Larox CC capillary action filter. The main
reasons hindering large scale industrial breakthrough in
US assisted separation techniques are nondevelopment of
transducer technology, high energy consumption, problems
to scale up the technology and control of erosion caused
by cavitation at high ultrasonic intensities. The main
focus of this paper is to present basic separation
phenomena and some interesting separation applications
connected to ultrasound.
Original language | English |
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Title of host publication | Progress in Filtration and Separation |
Publisher | Academic Press |
Chapter | 9 |
Pages | 399-421 |
ISBN (Print) | 978-0-12-384746-1 |
DOIs | |
Publication status | Published - 2015 |
MoE publication type | D2 Article in professional manuals or guides or professional information systems or text book material |
Keywords
- acoustic streaming
- cavitation
- cleaning
- filtration
- micro jet
- separation
- sieving
- standing wave
- transducer
- ultrasound