Separation of fine particles at different frequencies and HRTs using acoustic standing waves
- 26 August 2014
- journal article
- research article
- Published by Taylor & Francis Ltd in Environmental Technology
- Vol. 36 (3), 302-309
- https://doi.org/10.1080/09593330.2014.946096
Abstract
The objective of this study was to evaluate the separation of fine particles using several frequencies and hydraulic retention times (HRTs) in an acoustic standing wave reactor without any separate cooling devices. The acoustic standing wave reactor consisted of sufficient space (over 100 mm) between the transducer and reflector, resulting in a slight increase in temperature. However, the increase in temperature did not affect the formation of standing waves and particle aggregations in our experiments. The results indicated that the turbidity removal efficiencies of fine kaolin particles, when using frequencies of 580 kHz, 1, and 2 MHz, increased with longer standing wave operation time. Especially, the turbidity removal efficiencies for 1 and 2 MHz were higher than that for 580 kHz because the wavelength (λ) of the 580 kHz wave was longer than that of the 1 and 2 MHz waves. Furthermore, the turbidity removal efficiency of kaolin in a continuous reactor improved with increasing hydraulic retention times (HRTs), and the reactor was more effective with 1 and 2 MHz used in parallel instead of 1 and 2 MHz used individually under the same HRT conditions with the entrance length (EL) having no adverse effect.Keywords
This publication has 19 references indexed in Scilit:
- Controlling the acoustic streaming by pulsed ultrasoundsUltrasonics, 2013
- A novel binary particle fractionation techniquePhysics Procedia, 2010
- Separation of micron-sized particles in macro-scale cavities by ultrasonic standing wavesPhysics Procedia, 2010
- Development-Length Requirements for Fully Developed Laminar Pipe Flow of Inelastic Non-Newtonian LiquidsJournal of Fluids Engineering, 2007
- Investigation of two-dimensional acoustic resonant modes in a particle separatorUltrasonics, 2006
- Acoustically aided separation of oil droplets from aqueous emulsionsChemical Engineering Science, 2004
- Force field particle filter, combining ultrasound standing waves and laminar flowSensors and Actuators B: Chemical, 2001
- Migration of suspended particles in plane stationary ultrasonic fieldChemical Engineering Science, 1981
- Flow in the Entrance Region at Low Reynolds NumbersJournal of Fluids Engineering, 1973
- Behavior of non‐Newtonian fluids in the inlet region of a channelAIChE Journal, 1963