Fe^<3+> イオン-鉄粒子系における充填層内物質移動に及ぼす脈動流れの効果(電気めっき)(<特集>表面処理)

概要

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Effect of pulsating flow on mass transfer in packed bed is studied by taking Fe^<3+>-iron particle system as an example of liquid-solid system, because of the industrial importance of iron plating. Spherical and cubic particles are used as packing materials having very different shapes. Pulsation is generated by a rotary cock or a piston. Mass transfer coefficient k_L for cubes under steady flow is larger than that for spheres. Comparison of k_L under steady and pulsating flow without reverse flow (rotary cock) shows no effect of pulsating flow on mass transfer for both spheres and cubes. Comparison of k_L under steady and pulsating flow with reverse flow (piston) reveals, however, excellent effect ; mass transfer for spheres is accelerated under quasi-steady state and that for cubes is promoted much more than in quasi-steady state, where mass transfer is assumed to proceed depending on the absolute value of velocity. Velocity fluctuations just after the bed are measured by a hot film probe and the difference between the flow fields for spheres and cubes is discussed in connection with the difference of the mass transfer under steady and pulsating flow.
社団法人日本鉄鋼協会の論文
1991-07-01