We present an experimental study of the flapping instability which appears when a coaxial liquid jet is atomized by a cocurrent fast gas stream. When primary atomization does not lead to a total break-up of the liquid jet, it undergoes a largewavelength instability, characterized by very large amplitude oscillations, and can break into large liquid fragments whose typical size is the jet diamet...

We present an experimental investigation of Rayleigh-Bénard convection in binary-gas mixtures. In order to interpret the results quantitatively, we determined the necessary thermodynamic and transport properties for six mixtures ~He-CO2, He-SF6, He-Xe, Ne-Ar, Ar-CO2, and H2-Xe! by a combination of data from the literature, molecular-theory calculations, and thermal-conductivity measurements. Al...

Bubble columns are multiphase equipments used to bring into contact gas and liquid phases. Gas, that constitutes the dispersed phase, is distributed at the bottom of the column and rises as bubbles through the liquid that constitutes the continuous phase. They are frequently used in the industry although the partial knowledge of the fluid dynamics of the gas-liquid flow have hindered a complete...

INTRODUCTION Foam sclerotherapy has gained a great popularity among phlebologists worldwide, although a major lack of homogeneity in the material used to produce sclerosant foam (SF) and to inject SF has been reported. AIMS To highlight the literature data and a few personal clinical and experimental outcomes concerning the main variables in SF production and injection. METHODS A review of ...

An experimental study has been carried out of the two phase counter-current gas-liquid flow in a packed bed column operated in the proximity of the flooding point under periodic variations of inlet velocity of gas or liquid. Additional experiments have been focused on evaluating axial dispersion characteristics in the proximity of the flooding line in both liquid and gas phase using inert trace...

Economic pressures continue to force the petroleum industry to seek less expensive alternatives to conventional gravity based separation. The gas-liquid cylindrical cyclone (GLCC) is a simple, compact, low-cost separator that can provide an economically attractive alternative to conventional separators over a wide range of applications. Although cyclones have long been used for liquid/liquid, s...

An apparatus and methodology were de®eloped to measure the oxygen and carbon ( ) dioxide permeance of hollow fiber membranes HFMs in a gas-liquid en®ironment. The gas-liquid permeance measurements were compared with measurements made in a gas-gas en®ironment to ®alidate the methodology and to determine whether the permeance of an HFM in a gas-liquid en®ironment differs inherently than in a gas-...

the fast depletion of petroleum crude oil reserves and the serious consideration of environmental issues make the implementation of sustainable energy sources a crucial issue worldwide. biofuel derived from vegetable oils is receiving a great attention as one of the most suitable and logical alternatives of fossil fuels. therefore, the production of petroleum-like fractions from nonedible oil e...

This article describes an accurate subPico flowmeter bifurcatedin to liquid and gas flowrates less than 1mol/s for both MEMS/NEMS and cryogenic technology applications. The MEMS/NEMS are described as either two Gauges (instrument), or quartz fluctuating forks, even if the liquid or gas flows through an element, as well as cryogenic technology consisting of arrays of e...