Liquid Holdup and Electric Resistivity in an Irrigated Packed Bed

Abstract

Liquid holdup and electric resistivity in an irrigated packed bed for scrap melting with a high-frequency induction furnace was examined by using model experiments. In the measurement of liquid holdups, the contact angle between liquid and particles in the packed bed was controlled above 90°, and the inner wall of the packed bed was lined with a sheet of regularly arranged hemispherical convexity for eliminating wall effect. In the measurement of electric resistivity, molten wood's metal was irrigated to packed beds of graphite or iron particles. As the results, two empirical formulate were obtained as follows;
For static and dynamic holdups
ε_{l, s}=0.181Cp_m^-0.458Ga_m^-0.0218, ε_{l, d}=1.58×10⁵Re_m^0.268Cp_m^-2.16Ga_m^-0.526
For electric resistivity
ρ_e=1.92[1/3(ε_s/ρ_s+ε_l/ρ_l)+2/3 1/ε_sρ_s+ε_lρ_l]^-0.819[Nε_s/d_p/Lexp(ε_s-1/ε_l)]^-0.243