Foam Breaking Characteristics of a Mechanical Foam-Breaker Using Shear Force Fitted to a Stirred-Tank Reactor

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  • Takesono Satoshi
    Department of Applied Chemistry and Biotechnology, Niigata Institute of Technology
  • Onodera Masayuki
    Department of Applied Chemistry and Biotechnology, Niigata Institute of Technology
  • Yoshida Masanori
    Department of Chemistry and Chemical Engineering, Niigata University
  • Yamagiwa Kazuaki
    Department of Chemistry and Chemical Engineering, Niigata University
  • Ohkawa Akira
    Department of Chemistry and Chemical Engineering, Niigata University

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This study examined foam breaking characteristics of a mechanical foam-breaker using shear force (MFUS) between a fixed orifice plate and a rotating disk fitted to a stirred-tank reactor (STR). The effects of operating conditions on the liquid holdup in foam φL and the volumetric rate of foam flow Qa, which reflect the foaming behavior of the STR, were revealed. The foam-breaking behavior of the MFUS was investigated from changes in the foam density after foam breaking (ρf)c, which remained constant at a disk rotational speed N, transitional disk rotational speed Nt, and shearing power Ps. The value of (ρf)c decreased concomitant with the increase in the mass flow rate of liquid in the foam flowing into the orifice, wL. The Nt became larger concomitant with the lower average ascending velocity of the foam Ua and higher φL. The magnitude of Ps was related to that of wL. Empirical equations for predicting (ρf)c, Nt and Ps were obtained based on those results.

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