Particle Measurement Techniques in Fluid Process Engineering

Lichti, M.; Bart, Hans‐Jörg

doi:10.1002/cite.201700035

Cited by 6 publications

(3 citation statements)

References 135 publications

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“…For example, phase Doppler anemometry (PDA) is capable of detecting and analyzing droplets precisely in terms of size and velocity. Limited industrial applicability due to high calibration and measurement efforts, spatial and local requirements of the measurement access and specific instruction in respect of safety and explosion protection represent the many downsides , .…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Entrainment Control Using a Newly Developed Telecentric Inline Probe

Schulz

Schäfer

Bart

2019

Chemie Ingenieur Technik

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This contribution presents a novel approach to investigate entrainment in distillation and absorption columns. An image‐based probe allows precise droplet detection at various radial and axial positions above trays. Validations achieve an average error of 6.4 % (monospheres 9.2–114.4 µm) and 3 % (monodisperse droplet stream up to 19 m s−1 and 74.5 µm). Experiments in a DN 450 cold flow test rig show an increasing (decreasing) share of larger droplets with higher gas (liquid) loads. Locally measured droplet sizes depend on probe position as well as tray design and enable an extrapolation to integral entrainment rates.

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Section: Theoretical Backgroundmentioning

confidence: 99%

Entrainment Control Using a Newly Developed Telecentric Inline Probe

Schulz

Schäfer

Bart

2019

Chemie Ingenieur Technik

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“…One difficulty in analyzing the properties of disperse flows is that they can usually only be measured directly in the apparatus. In principle, there are different methods to measure PSD inline like focused beam reflectance measurement, laser Doppler anemometry, needle probes, or shadow graphical techniques. , The latter was used in the so-called optical multimode online probe (OMOP) that was developed by Mickler and Bart. The OMOP combines collimated light with a telecentric lens.…”

Section: Introductionmentioning

confidence: 99%

A New Image Evaluation Method for Disperse Multiphase Processes Using Synthetic Training Data

Weibel,

Hofmann,

Garth

et al. 2024

Ind. Eng. Chem. Res.

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A new algorithm for the detection and evaluation of spherical particle objects (called SPODE) has been developed. It can be used to automatically analyze images of disperse flows (e.g., bubbles, droplets, sprays) obtained with a shadow graphic inline probe. The algorithm contains a convolutional neural network (CNN) trained with synthetically generated particles. The use of synthetic particles has the advantage that the exact size and position of the particles are known, and therefore the CNN can be validated. The synthetic images are generated using a physical model of light transport in the particle-loaded fluid (i.e., ray tracing). The algorithm was applied to real data of droplets in a pump-mixer and bubbles in an aerated stirred tank. Particles were detected, and their size distributions were determined. The results clearly show that the algorithm can automatically and reliably analyze images of disperse multiphase flow.

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“…Kulkarni and Joshi (2005) described no effect or only a slight effect of viscosity on bubble size. Better measurement techniques and algorithms however improved the sensitivity of the analysis and led to better results in recent years (Lichti and Bart, 2017).…”

Section: Introductionmentioning

confidence: 99%

Bubble motion and reaction in different viscous liquids

Hlawitschka

Kováts

Dönmez

et al. 2020

Exp. Comput. Multiph. Flow

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Reactive bubble columns are omnipresent in the chemical industry. The layout of these columns is still limited by correlations and therefore improved simulation techniques are required to describe the complex hydrodynamics/reaction interaction. In this work, we focus on the numerical and experimental study of the viscosity influence on bubble motion and reaction using an Euler-Lagrange framework with an added oscillation and reaction model to bring the column layout base closer to a predictive level. For comparison and validation, experimental data in various water-glycerol solutions was obtained in a cylindrical bubble column at low gas hold-up, where the main parameters such as bubble size, motion, and velocities were detected. Glycerol leads thereby to a change in viscosity and surface tension. Further, the surface tension was modified by addition of a surfactant. The bubble oscillating motion in low to higher viscosity could be described using an Euler-Lagrange framework and enables a description of industrial bubble flows. In addition, the simulations were in good agreement concerning reactive mass transfer investigations at higher viscosity of the liquid which led to an overall lower mass transfer compared to the cases with lower viscosity.

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Particle Measurement Techniques in Fluid Process Engineering

Cited by 6 publications

References 135 publications

Entrainment Control Using a Newly Developed Telecentric Inline Probe

Entrainment Control Using a Newly Developed Telecentric Inline Probe

A New Image Evaluation Method for Disperse Multiphase Processes Using Synthetic Training Data

Bubble motion and reaction in different viscous liquids

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