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맥동계내에 물질전달이 있을 때의 무차원군

Dimensionless Groups in Vibrating Systems Accompanying Mass Transfer

HWAHAK KONGHAK, February 1975, 13(1), 11-16(6), NONE
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Abstract

진동, 맥류 및 음파작용 등의 맥동을 공정내에 도입하여 물질전달률을 증진시키려고 할 때의 계내의 특성을 분석하기 위하여 고려해야할 주요한 무차원수에 대하여 고찰하였다. 맥동계내에서 물질전달현상이 일어날 때는 계전체가 난류가 아닐 때도 극부적으로 진동물체의 경계근처에서 난확산이 일어남을 추론할 수 있으며, 이때의 난확산계수는 α2f에 비례하고, 진동체의 상태가 단일 vibrational mode일 때는 α2f/vD가 중요하며, combined mode일 때는 αfD/ν가, 또 crowded bubble system에서는 ρ(αf2l/σ가 중요함을 차원해석과 실험결과에서 확인하였다.
Important dimensionless groups were investigated to find basic experimental correlations in vibrating systems. When mass transfer occurred in the system, it was deduced that eddy diffusion took place locally near the vibrating bodies without having turbulent flow in the whole system. The eddy diffusivity in the system turned out to be proportional to the factor, α2f. For a system in a single vibrational mode, α2f/vD was a very important dimensionless group. For a combined vibrational mode system, ραfD/μ, and for a crowded bubble system ρ(αf2l/σ became important. These conclusions were confirmed both by dimensional analysis and by experimental results.

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