Gas-phase Mass Transfer by Impinging Jet on Liquid Surface in Crucible

Abstract

Average mass transfer between an impinging laminar jet of gas and a liquid surface in a crucible was studied.
The experiments were carried out in the following systems;
a) H₂O (1)-CO₂ (g), C₂H₅OH (l)-H₂ (g) and H₂O (l)-CO₂ (g) systems with known diffusion coefficients D_AB (m²/s) near room temperature (1060°C),
b) FeCl₂-(l)-N₂ (g) system with unknown diffusion coefficient in high temperature (700930°C).
(1) For the average Sherwood number Sh (≡kd_c/ D_AB), the correlation was obtained as
Sh=m (r_c/d)^-1Re^0.87 Sc^0.66, (m= 0.56 ± 0.06)
by the experiment on systems a) under condition;
4≤Re≤800, 0.5≤Sc≤1.24, 3.17≤(r_c/d)≤9.5.
(2) For the system b), Sh could also be expressed by the above equation above for 20≤Re≤200, r_c/d= 2.42.
(3) Temperature dependence of the diffusion coefficient of FeCl₂ (g) in N₂ (g) for 700 to 930°C, 1 atm was obtained as
D_{FeCl2^- N2}=a (T/273)^2.0×10^-4, (a= 0.31±0.01) (m²/s)
based on the similarity between experiments a) and b) for gas-phase mass transfer.