Dynamics of single rising bubbles in neutrally buoyant liquid-solid suspensions

Nasim Hooshyar, J. Ruud Van Ommen, Peter J. Hamersma, Sankaran Sundaresan, Robert F. Mudde

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


We experimentally investigate the effect of particles on the dynamics of a gas bubble rising in a liquid-solid suspension while the particles are equally sized and neutrally buoyant. Using the Stokes number as a universal scale, we show that when a bubble rises through a suspension characterized by a low Stokes number (in our case, small particles), it will hardly collide with the particles and will experience the suspension as a pseudoclear liquid. On the other hand, when the Stokes number is high (large particles), the high particle inertia leads to direct collisions with the bubble. In that case, Newton's collision rule applies, and direct exchange of momentum and energy between the bubble and the particles occurs. We present a simple theory that describes the underlying mechanism determining the terminal bubble velocity.

Original languageEnglish (US)
Article number244501
JournalPhysical review letters
Issue number24
StatePublished - Jun 11 2013

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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