Interaction between bubbles and fibre optic probes in a bubble column

Chabot, J.; Lee, S. L. P.; Soria, Alberto; Lasa, Hugo I. de

doi:10.1002/cjce.5450700110

Cited by 28 publications

(21 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, there 0894 is no calibration standard for them. The most used methods are: high-speed photography [22][23][24][25][26][27]; electrical impedance tomography [28], capillary suction probes [20], optical waveguided sensors [29,30]; endoscopic optical probes [31,32]; capacitance probes [23] and passive acoustic detection [14,15,33]. There are some disagreements among them, since some offer greater rapidity of detection but are constrained by the sensing element sensitivity or by data interpretation issues (passive acoustic, capacitance and electric impedance methods), while others depend on the purity of the liquid medium and lighting effects (photographic and optical methods).…”

Section: Introductionmentioning

confidence: 99%

A look at three measurement techniques for bubble size determination

Vázquez

Sánchez

Salinas-Rodríguez

et al. 2005

Experimental Thermal and Fluid Science

Self Cite

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

A look at three measurement techniques for bubble size determination

Vázquez

Sánchez

Salinas-Rodríguez

et al. 2005

Experimental Thermal and Fluid Science

Self Cite

View full text Add to dashboard Cite

“…The immersed probe in the flow can cause disintegration, acceleration or elongation of the bubbles. [38][39][40][41][42] Reduction in the size of the probe, although reduces the effect of the interference, but makes the probe susceptible to damage.…”

Section: Intrusive Techniquesmentioning

confidence: 99%

Untitled

2017

IPCSE

View full text Add to dashboard Cite

Abbreviations BSD, bubble size distribution; PET, positron emission tomography; PIV, particle image velocimetry, RPT; radioactive particle tracking; NMR, nuclear magnetic resonance imaging IntroductionMultiphase flow systems have been applied extensively in chemical, physical, petrochemical and biochemical processing industries.1-3 Among different multiphase flow systems, bubbly flow is a two phase flow where small bubbles are dispersed or suspended in a liquid continuum. Typical features of this flow are moving and deformable interfaces of bubbles in time and space domains and complex interactions between the interfaces, and also between the bubbles and the liquid flow. Bubbly flows occur frequently in natural systems and are also used for different applications in energy-producing and chemical and petroleum industries. Some of the common applications involve bubble columns which are used as reactors in a variety of chemical and biochemical processes, e.g. the Fischer-Tropsch process for hydrocarbon synthesis, hydrogenation of unsaturated oil, coal liquefaction, fermentation, waste water treatment etc. 4,5 Bubbly flows are also ubiquitously found in flotation cells 6 and spargers 7 and have recently been investigated extensively for aeration studies. [8][9][10][11][12] Concentration, size and velocity distributions of solid or liquid particles suspended in gas or liquid are important in many processes such as meteorological research, biology, environmental protection, chemistry, medicine and agricultural engineering. Further, commercial activities such as conversion of natural gas to fuels and chemicals have prompted further fundamental research in fluid and bubble dynamics, transport phenomena and the effects due to scale up of three-phase fluidization systems.The prediction of pressure drop and wall heat transfer is necessary in many of these processes and these are strongly dependent upon the concentration, morphology and spatial distribution of the bubbles. 13 Similarly, in many liquid-gas systems, gases are dispersed in liquids to obtain large interfacial area for chemical reactions, heat and mass transfer processes. The rate of these processes is determined by bubble surface area flux which is closely linked to the bubble size distribution. 14 DiscussionDifferent techniques have been employed to measure bubble size distributions. Broadly, it can be divided into two categoriesintrusive and non-intrusive techniques.15 Both these methods have been extensively reported in the literature and a brief description of different intrusive and non-intrusive techniques is provided below, Intrusive techniquesConsiderable intrusive techniques have been developed to study bubble behavior in gas-liquid and gas-liquid-solid fluidized systems. These intrusive techniques include impedance (conductivity or resistivity) probes, capillary suction probes, 16 optical fiber probes, ultrasound probes, endoscopic probes, wire-mesh sensors 17 and hot film anemometry.The impedance probe has been applied to measure the bubble volume f...

show abstract

“…With this U design the source light will be lost in liquid and conserved when exposed to gas, Goldstein (1983). The principle of operation of the spherical bulb dual fiber optical probe, Chabot et al (1992) is similar to the U-bend single fibre optic probe.…”

Section: Figure 8 Details Of the Optical Probe Used By Okhi Andd Shiraimentioning

confidence: 99%

Measurement Techniques and Data Interpretations for Validating CFD Multi Phase Reactor Models

Tayebi

Svendsen

Jakobsen

et al. 2001

Chemical Engineering Communications

View full text Add to dashboard Cite

One problem associated with the use of Computational Fluid Dynamics(CFD) in reactor modeling is the proper validation of the models. Proper validation in this context means that the physical fluid dynamic model, the mathematical implementation and the data used for validation must be consistent. The present paper addresses this issue and to provide appropriate relations between experimental method and modeling approach.A critical review of currently used measurement techniques for characterizing multiphase flow systems is presented. The interpretation of the data obtained from the various techniques is discussed as well as how these data can be used for validation of various CFD model formulations.Steady state models can be validated using time averaged data, making sure that the averaging time for the experimental data is long enough so that low frequency periodic oscillations also are evened out. If homogeneous systems are considered, then a volume average approach may be used for modeling. If the system cannot be considered homogeneous and steady, as is the most common case, then a dynamic ensemble averaging technique should be preferred. The validation of such models must be done with methods fast enough to resolve periodic fluctuating structures of interest. These methods are cumbersome and tedious to operate and the ergodic hypothesis may be invoked enabling the use of volume or time averaged data for the validation of ensemble averaged models.

show abstract

Interaction between bubbles and fibre optic probes in a bubble column

Cited by 28 publications

References 9 publications

A look at three measurement techniques for bubble size determination

A look at three measurement techniques for bubble size determination

Untitled

Measurement Techniques and Data Interpretations for Validating CFD Multi Phase Reactor Models

Contact Info

Product

Resources

About