A new plotting technique for modeling critical flow through Multi-Orifice wellhead chokes

Two-phase countercurrent flow through a bed of packing. VII. Pressure drop at flooding and critical flow rates of both phases in packed bed of spheres

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19721666 ◽

1972 ◽

Vol 37 (5) ◽

pp. 1666-1670

Author(s):

V. Kolář ◽

Z. Brož

Keyword(s):

Pressure Drop ◽

Packed Bed ◽

Critical Flow ◽

Countercurrent Flow ◽

Two Phase ◽

Flow Rates ◽

Flow Through

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Study on the two-phase critical flow through a small bottom break in a pressurized horizontal pipe

Journal of Sound and Vibration ◽

10.1016/j.jsv.2008.01.049 ◽

2008 ◽

Vol 313 (1-2) ◽

pp. 7-15 ◽

Cited By ~ 3

Author(s):

Moon-Sun Chung

Keyword(s):

Critical Flow ◽

Two Phase ◽

Horizontal Pipe ◽

Flow Through

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Application of Three-Layer Model Analysis to Single-Component Two-Phase Critical Flow through a Converging Nozzle. (Comparison of the Experimental Results for Steam-Water Mixture and Carbon Dioxide with the Calculated Results).

JSME International Journal Series B ◽

10.1299/jsmeb.39.80 ◽

1996 ◽

Vol 39 (1) ◽

pp. 80-85

Author(s):

Junji OCHI ◽

Kyozo AYUKAWA ◽

Genta KAWAHARA

Keyword(s):

Carbon Dioxide ◽

Model Analysis ◽

Single Component ◽

Experimental Results ◽

Critical Flow ◽

Water Mixture ◽

Layer Model ◽

Two Phase ◽

Flow Through

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Three-layer model analysis on two-phase critical flow through a conerging nozzle. On the case of two-component two-phase flow.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B ◽

10.1299/kikaib.57.1232 ◽

1991 ◽

Vol 57 (536) ◽

pp. 1232-1238

Author(s):

Junji OCHI ◽

Kyozo AYUKAWA ◽

Yoshihiro KADOTA

Keyword(s):

Two Phase Flow ◽

Model Analysis ◽

Critical Flow ◽

Phase Flow ◽

Layer Model ◽

Two Phase ◽

Two Component ◽

Flow Through

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Relaxation Effects in Small Critical Nozzles

Journal of Fluids Engineering ◽

10.1115/1.2137346 ◽

2005 ◽

Vol 128 (1) ◽

pp. 170-176

Author(s):

Aaron N. Johnson ◽

Charles L. Merkle ◽

Michael R. Moldover ◽

John D. Wright

Keyword(s):

Experimental Data ◽

Degrees Of Freedom ◽

Critical Flow ◽

Worst Case ◽

Relaxation Effects ◽

Critical Nozzles ◽

Rotational Degrees Of Freedom ◽

Computational Fluid Dynamics Cfd ◽

Flow Through ◽

Throat Diameter

We computed the flow of four gases (He, N2, CO2, and SF6) through a critical flow venturi (CFV) by augmenting traditional computational fluid dynamics (CFD) with a rate equation that accounts for τrelax, a species-dependent relaxation time that characterizes the equilibration of the vibrational degrees of freedom with the translational and rotational degrees of freedom. Conventional CFD (τrelax=0) underpredicts the flow through small CFVs (throat diameter d=0.593mm) by up to 2.3% for CO2 and by up to 1.2% for SF6. When we used values of τrelax from the acoustics literature, the augmented CFD underpredicted the flow for SF6 by only 0.3%, in the worst case. The augmented predictions for CO2 were within the scatter of previously published experimental data (±0.1%). As expected, both conventional and augmented CFD agree with experiments for He and N2. Thus, augmented CFD enables one to calibrate a small CFV with one gas (e.g., N2) and to use these results as a flow standard with other gases (e.g., CO2) for which reliable values of τrelax and the relaxing heat capacity are available.

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