It was suspected that a downward water velocity at the peripheral region along the pipe wall behind the plug was increased by the particles. To compensate it, the upward velocity of water at the central region behind the plug was increased and the rising velocity of the plug became fast....
A comprehensive database on upward two-phase flows in vertical pipes was obtained using the wire-mesh sensor technologies for gas-liquid flows in vertical pipes. The investigations were done for different pipe diameter as well as for flows with and without phase transfer. Wire-mesh sensors provide...
Sign in to download full-size image Figure 6-8.Laminar gas flow patterns. (Top) Flow across flat plate. (Bottom) Flow through circular pipe. The average boundary layer thickness over the whole plate is (6-24)δ¯=1/L∫0Lδ(x) dx=103Lηρv0L=103LReL ...
It was found that the solids flow distribution and pressure drop of the two materials have similar trend and were significantly affected by the branch angle and gas velocity.Finally, the solids flow distribution and pressure drop on each branch pipe were calculated based on experimental data, ...
The relation between circulation rate and critical gas velocity for complete suspension was discussed taking into account the mechanism for suspending solid particle in horizontal pipe.关键词: Circulation rate Complete suspension Critical gas velocity Short size draft tube Slurry bubble column Solid ...
In long and high-pressure gas transport pipe lines, the line-depressurization technique is impractical. Depressurization causes the hydrate plug’s velocity to rise, which can damage the whole pipeline structure. Kavianpour, et al. [32] has successfully proposed a new mechanism for gas hydrate ...
In some conditions, the gas travels at a much higher velocity than the liquid. Accordingly, the flowing density of the gas–liquid mixture is higher than the corresponding density. Moreover, the liquid’s velocity inside the pipe wall can be different over a short distance and can cause a ...
In churn flow part of the liquid could travel as entrained drops. In annular flow the fraction of entrained liquid will increase as the gas superficial velocity and pipe diameter, Azzopardi (2006). The position is less clear for churn flow. The measurement techniques which are suitable to deter...
A gas-solid two-phases flow in a vertical pipe was investigated experimentally. Particle velocity and concentration were measured by an optical fiber probe... T Tanaka,Y Takagi,Y Tsuji,... - 《Nihon Kikai Gakkai Ronbunshu B Hen/transactions of the Japan Society of Mechanical Engineers Part ...
c Example of an artificial step, created by forcing the stream into a pipe and then covering the downstream river bed with a plastic film. d example of a scoured natural step. The insets in the last three panels show the observed time series of water CO2 concentration in the upstream (...