Gas holdups and bubble characteristics in a bubble column operated at high temperature

Chabot, J.; Lasa, Hugo I. de

doi:10.1021/ie00023a023

Cited by 34 publications

(9 citation statements)

References 6 publications

(11 reference statements)

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“…However, they also found that for an air-electrolyte solution, temperature has a positive effect on gas holdup at low gas velocities but has a negative effect at high gas velocities. On the contrary, Zou et al (1988) and Chabot and de Lasa (1993) both found that elevated temperature always increases the gas holdup in their systems. Zou et al (1988) attributed the mechanism of temperature effect to a decrease in surface tension and liquid viscosity.…”

Section: Introductionmentioning

confidence: 94%

Bubble flow characteristics in bubble columns at elevated pressure and temperature

Lin¹,

Tsuchiya²,

Fan³

1998

AIChE Journal

146

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Section: Introductionmentioning

confidence: 94%

Bubble flow characteristics in bubble columns at elevated pressure and temperature

Lin¹,

Tsuchiya²,

Fan³

1998

AIChE Journal

146

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“…Frijlink [ 123 ] developed a four-point probe to improve the detection of the direction of the movement and the shape of the bubble. Chabot and de Lasa [ 124 ] measured the axial and radial distributions of bubble chord length, bubble rise velocity and gas volume fraction in a bubble column at high temperature by using the refractive optical probe. Shoukri et al [ 125 ] measured the gas volume fraction, bubble size, bubble rise velocity, bubble frequency and interfacial area in a large scale bubble column using a dual optical probe.…”

Section: Application Of Fiber-optical Probes In Multiphase Reactorsmentioning

confidence: 99%

Fiber-Optical Sensors: Basics and Applications in Multiphase Reactors

Yanɡ

Yang

et al. 2012

Sensors

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This work presents a brief introduction on the basics of fiber-optical sensors and an overview focused on the applications to measurements in multiphase reactors. The most commonly principle utilized is laser back scattering, which is also the foundation for almost all current probes used in multiphase reactors. The fiber-optical probe techniques in two-phase reactors are more developed than those in three-phase reactors. There are many studies on the measurement of gas holdup using fiber-optical probes in three-phase fluidized beds, but negative interference of particles on probe function was less studied. The interactions between solids and probe tips were less studied because glass beads etc. were always used as the solid phase. The vision probes may be the most promising for simultaneous measurements of gas dispersion and solids suspension in three-phase reactors. Thus, the following techniques of the fiber-optical probes in multiphase reactors should be developed further: (1) online measuring techniques under nearly industrial operating conditions; (2) corresponding signal data processing techniques; (3) joint application with other measuring techniques.

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“…• probes bent in a U shape tip (Jones & Delhaye, 1976;Lee & De Lasa, 1987;Yu & Kim, 1991). Such probes are however extremely fragile and are, to the knowledge of the authors, no longer in use, • probes with melt extremities, giving a spherically shaped tip (Moujaes, 1990;Chabot, Lee, Soria, & De Lasa, 1992;Chabot & De Lasa, 1993).…”

Section: Principlementioning

confidence: 99%

Measuring Techniques in Gas—Liquid and Gas—Liquid—Solid Reactors

Boyer¹,

Duquenne²,

Wild³

2003

ChemInform

119

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This article oers an overview of the instrumentation techniques developed for multiphase ow analysis either in gas/liquid or in gas/liquid/solid reactors. To characterise properly such reactors, experimental data have to be acquired at dierent space scale or time frequency. The existing multiphase ow metering techniques described give information concerning reactor hydrodynamics such as pressure, phases holdups, phases velocities, ow regime, size and shape of dispersed inclusions, axial diusion coecients. The measuring techniques are presented in two groups: the non-intrusive techniques that deliver global, cross-section-averaged or local data, and the intrusive probes that are dedicated to local measurements. Eventually some examples of multiphase instrumentation development are reported (trickle-bed and slurry bubble column at semi-industrial scale) in the renery or petrochemical area.

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Gas holdups and bubble characteristics in a bubble column operated at high temperature

Cited by 34 publications

References 6 publications

Bubble flow characteristics in bubble columns at elevated pressure and temperature

Bubble flow characteristics in bubble columns at elevated pressure and temperature

Fiber-Optical Sensors: Basics and Applications in Multiphase Reactors

Measuring Techniques in Gas—Liquid and Gas—Liquid—Solid Reactors

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