固体金属円柱から溶融金属中への物質移動

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1) Mass-transfer coefficient, k, from rotated or static solid metal cylinder surface into liquid metal, was measured chemically or gravimetrically. In this report, steel-Al, steel-Zn, Cu-Pb, Zn-Hg and Sn-Hg were employed as the combination of solid metal cylinder-liquid metal bath. Correlation of mass-transfer coeff. to the physical properties of liquid metal, diffusion coeff., characteristic length of the cylinder and experimental conditions (temperature, speed of rotation, etc.) was analysed non-dimensionally. Results obtained are as follows : Jd=(k/U)(Sc)^<2/3>=0.065 (Re)^<-0.25> : rotated cylinder (Sh)=0.124 (Gr・m×Sc)^<1/3> : static cylinder 2) These equations were rearranged to estimate the mass-transfer coeff. in the dissolution process of steel cylinder into liquid Fe-C alloy at about 1400℃. k=9.14×10^<-4>(L)^<-0.25>(U)^<0.75> : rotated cylinder k=1.17×10^<-2>(⊿ρ)^<0.333> : static cylinder Experimental results fairly agreed with the estimated values in the case of rotated cylinder but were about 30% lower than estimated values in the case of static cylinder, as averaged k. 3) It would be concluded that the non-dimensional correlation of mass-transfer, predicted in common fluid at lower temperature, holds fairly well even with high temperature liquid metal such as Fe-C alloy at 1400℃ in spite of technical difficulties of experiment at high temperature (especially in free convection) and the lack of the fundamental data on physical properties, diffusion coeff. of liquid metals.
社団法人日本鉄鋼協会の論文
1966-11-01

固体金属円柱から溶融金属中への物質移動

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