摘要:

Supermultiple-point-electrode conductance probe method has recently become realistic for examining the interfacial structure in gas-liquid two-phase flow. A new instrument based on this method was developed and applied into vertical downward gas-liquid two-phase flow

ISSN:0098-6445    

DOI:10.1080/00986449608936427

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

The stability of stratified three phase flow (water-oil-gas) was analyzed using two approaches: A straight forward Kelvin-Helmholtz stability analysis on the two interfaces termed here the “exact” approach and a simplified approach. 1 n the “exact” approach the two interfaces (water-oil and oil-gas) are perturbed, while in the simplified approach the perturbed interface is only the upper oil-gas interface. Both approaches include the viscous Kelvin-Helmholtz analysis in which the shear stresses are laken into account and the inviscid K H analysis where the shear stresses are neglected.

ISSN:0098-6445    

DOI:10.1080/00986449608936428

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

This work discusses certain fundamental aspects in the mixing of particle clouds plunging into water. In particular, the momentum transfer in the isothermal interaction is considered here, as part of a broader investigation involving very high-temperature particles and thus heat transfer and phase change, as related to the premixing phase of steam explosions. The focus is on the multifield behaviour, and the investigation is carried out experimentally in the MAGICO-2000 facility: we observe front advancements, mixing region evolution and water displacements. The effect of particle volume fraction, density, inlet velocity and pool geometry are analyzed. Measurements are taken by means of high-speed videos and X-ray radiography: the latter allows us to map the interior of the mixing region, highlighting interesting features of the interaction. All results are compared to the numerical simulations obtained with the PM-ALPHA code, and the exercise reveals good predictive capabilities for it.

ISSN:0098-6445    

DOI:10.1080/00986449608936429

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

General theorems are derived, relating the impulse, polarization (internal dipole moment) and average velocity field for a dispersion of spheres in a potential flow. A constitutive equation is developed and a structure-dependent coefficient, λ, defined. A first approximation to λ, valid for low concentrations of spheres, is obtained and evaluated for rectangular arrays, using image methods.

ISSN:0098-6445    

DOI:10.1080/00986449608936430

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor