Particle Separation According to Frequency Changes of Acoustic Standing Wave
안재환 Jae Hwan Ahn , 안광호 Kwang Ho Ahn
Abstract
The particle separation technology using acoustic standing waves is a method of separating particles from the fluid by causing acoustic standing waves in the cross-sectional area of the channel and placing the particles in array within the nodes of the wave. When waves with the same frequency proceeding in the opposite direction encounter each other, the effect in which waves remain in place appears due to mutual superposition, while particles will converge on the part of the nodes. Existing particle separation device of standing wave was used a cooling apparatus to prevent an increase in temperature and was tested in narrow channel(less than 30mm between the transducer and reflector) to form a standing wave. The characteristics of particle separation according to the changes in frequency were examined by reactor of 100mm or more interval between the transducer and reflector without cooling device. As a result, water temperature rise by 1.3~2℃ was no effect on the standing wave formation at all frequencies. Removal efficiency of turbidity was higher in the 1MHz and 2MHz than 580kHz and was higher 10 minutes than 5 minutes during the operating time.
Key Words
acoustic standing wave, particle separation, removal efficiency of turbidity, frequency