464. 2相流の蒸気ボイド率に関する研究,(II)

抄録

The steam volume fraction α of a two phase mixture flowing upward under atmospheric pressure was measured in a vertical concentric annulus, with inner and outer diameters respectively 9.5mm and 21mm. Use was made of a capacitance type void meter described in a previous paper, and the following correlation was obtained:
α=1-√(1-x)³/1+Kx,
where K=ερ_l/ρ_gV^0.5₀exp (-2×10^-6q)
ε=1.3 (bubble flow), ε=1 (slug flow and annular flow)
x is the steam weight fraction, ρ_l/ρ_g the density ratio of liquid to steam, V₀ the superficial velocity (m/s), and q the heat flux (kcal/mm²·hr).
The experimental data obtained under high pressure by several investigators for various channel forms correlated very well with use of the formula
K=ερ_l/ρ_gV^0.5₀, where ε is the same as mentioned above.
These correlations are very useful for predicting the steam volume fraction at various pressures below 2, 000 psia.