•Sonication with different frequencies is used to disrupt sludge flocs.•The disrupted sludge is mixed with coal to prepare coal–sludge slurry.•Effects of sonic frequency on reducing slurry viscosity are studied.•Low-frequency sonication generates more intense cavitation effects.•Low-frequency sonication has more obvious effects of reducing slurry viscosity.
Applied Thermal Engineering – Elsevier
Published: Apr 25, 2016
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