Momentum Transfer in Two-Phase Flow of Gas Pseudoplastic Liquid Mixtures

1972 ◽  
Vol 11 (4) ◽  
pp. 470-477 ◽  
Author(s):  
R. Mahalingam ◽  
Manuel A. Valle
Keyword(s):  
Momentum Transfer ◽  
Two Phase Flow ◽  
Liquid Mixtures ◽  
Phase Flow ◽  
Two Phase ◽  
Pseudoplastic Liquid

Two-Phase Flow in Liquid Filled Vessels During the Depressurization by Periodic Venting

2003 ◽  
Author(s):  
Dieter Mewes ◽  
Dirk Schmitz
Keyword(s):  
Single Phase ◽  
Two Phase Flow ◽  
Bubbly Flow ◽  
Exothermic Reaction ◽  
Liquid Mixtures ◽  
Phase Flow ◽  
Two Phase ◽  
Pressure Losses ◽  
Short Period ◽  
Liquid Flows

Pressurized chemical reactors or storage vessels are often partly filled with liquid mixtures of reacting components. In case of an unexpected and uncontrolled exothermic reaction the temperature might increase. By this the pressure follows and would exceed a critical maximum value if there would be no mechanism to decrease the pressure and the temperature in a very short period of time. A sudden venting by the opening of a safety valve or a rupture disc causes a rapid vaporization of the reacting liquid mixture. A two-phase flow will pass the ventline. Since two-phase gas-liquid flows cause high pressure losses and give rise to limited mass flows leaving the reactor, single-phase gas flows are preferred. This is emphasized by a periodic venting mechanism of the pressurized vessel. Each time the two-phase flow from the bubbling-up liquid inside the vessel reaches a certain cross-section close the entrance of the ventline. The outlet-valve is closed. Inside the vessel the increasing pressure stops the two-phase flow and only single phase flow is leaving the vessel. The two-phase bubbly flow inside the vessel is detected by a tomographic measurement device during the venting process. Experimental results for local and time dependant phase void fractions as well as pressures are compared with those obtained by numerical calculations of the instationary bubble swarm behavior inside the vessel.

Heat Transfer in Two-Phase Flow of Gas-Liquid Mixtures

1965 ◽  
Vol 4 (3) ◽  
pp. 339-344 ◽  
Author(s):  
A. A. Kudirka ◽  
R. J. Grosh ◽  
P. W. McFadden
Keyword(s):  
Heat Transfer ◽  
Two Phase Flow ◽  
Liquid Mixtures ◽  
Phase Flow ◽  
Two Phase

scholarly journals CORRELATION OF DATA ON THE APPARENT FRIC-TION COEFFICIENT IN UPWARD TWO-PHASE FLOW OF AIR-LIQUID MIXTURES

1975 ◽  
Vol 8 (2) ◽  
pp. 113-118 ◽  
Author(s):  
TAHEI TOMIDA ◽  
TSUKASA YAMAMOTO ◽  
TAMOTSU TAKEBAYASHI ◽  
TATSUYA OKAZAKI
Keyword(s):  
Two Phase Flow ◽  
Liquid Mixtures ◽  
Phase Flow ◽  
Two Phase

Flow of Incompressible Two-Phase Mixtures through Sharp-Edged Orifices

1967 ◽  
Vol 9 (1) ◽  
pp. 72-78 ◽  
Author(s):  
D. Chisholm
Keyword(s):  
Single Phase ◽  
Two Phase Flow ◽  
Weight Ratio ◽  
Liquid Mixtures ◽  
Theoretical Development ◽  
Phase Flow ◽  
Two Phase ◽  
Phase Velocities ◽  
Total Mixture ◽  
Good Agreement

Equations are developed for the flow of gas-liquid or vapour-liquid mixtures through sharp-edged orifices under conditions where the density change of the gas or liquid through the orifice is negligible. The theoretical development differs from previous treatments in allowing for the interfacial shear force between the phases, and leads to an equation which is shown to be in good agreement with available experimental evidence. The determination by experiment of a single coefficient characterizing the pipe and orifice arrangement permits the prediction of both the two-phase flow rate and the ratio of the phase velocities for a given pressure drop and gas-liquid weight ratio. The range of conditions examined extends over weight ratios of gas to total mixture from 0·1 to 98 per cent, and ratios of downstream to upstream pressures greater than 0·99. The accuracy of correlation of two-phase flow data is now approaching that of single-phase flow.

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