Showing papers on "Slug flow published in 1968"

Basic Studies on Two-Phase Flow with the Use of Electrical Void-Meter

Abstract: Farther basic knowledge has been gained on the behavior of two-phase flow through the follow-ing experiments. An electrical void-meter based on transducement of void fraction into impedance is employed to measure the void distribution along a heater in an annular channel.Experiments have further been conducted on the "velocity slip ratio (V0/V1)" to correlate the void-fraction (Rg) with the volume flow rate ratio (Fg). The resulting equation takes the form Rg= 0.92•Fg, and the ratio V0/V1 = 1.08, for slug flow in a vertical pipe.Statistical methods have been applied in analyzing the two-phase flow. It is shown that the speed of voids in a two-phase flow can be determined with a cross-correlation function calculated from two time series of void-fraction fluctuation measured at two points along the channel.

464. 2相流の蒸気ボイド率に関する研究,(ii)

Abstract: 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=eρl/ρgV0.50exp (-2×10-6q)e=1.3 (bubble flow), e=1 (slug flow and annular flow)x is the steam weight fraction, ρl/ρg 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 formulaK=eρl/ρgV0.50, where e is the same as mentioned above.These correlations are very useful for predicting the steam volume fraction at various pressures below 2, 000 psia.