Zur mehrphasigen Strömung in einem Zick-Zack-Sichter

Gillandt, I; Fritsching, Udo; Riehle, Claus

doi:10.1007/bf02601909

Cited by 20 publications

(11 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Even for the eight-segment experiments with the highest feed mass stream, particles are observed bouncing back and forth in the channel at other positions than the bends. Therefore, the gradual change in movement pattern as described by Gillandt et al [17] is confirmed.…”

Section: Particle Movement Patternsupporting

confidence: 66%

“…Therefore, only the two most important particle movement patterns are used as the basis for the modelling and explained in detail below. Despite the differences in the observed particle movement patterns, the airflow structure is similar in all studies [6,8,9,11,17], as described in section 2. The flow and particle movement patterns are illustrated in Figure 5.…”

Section: Particle Movement Patternmentioning

confidence: 62%

“…The first particle movement pattern, (a), is a stochastic bouncing of the particles through the channel. It is described by Gillandt et al [17] and is illustrated in Figure 5a. The particles bounce back and forth between the channel walls, crossing the main airflow regularly.…”

Section: Particle Movement Patternmentioning

confidence: 94%

“…Gillandt et al [17] for the description of the total separator grade efficiency, based on the multisegment model of Kaiser [8], adjusted for a differing number of overflow stages, z O , and underflow stages, z U , as well as differing single-stage grade efficiency functions for the overflow, T O , and the underflow, T U :…”

Section: Previous Zigzag Separator Studiesmentioning

confidence: 99%

“…Gillandt et al [17] recognised a transition in the particle movement from stochastic movement according to pattern (a) to the formation of particle vortexes with increasing feed mass stream. Therefore, the particle movement inside the ZZS can be seen as a superposition of all three particle movement patterns, with an increasing influence of the patterns (b) and (c) due to increasing particle loading.…”

Section: Particle Movement Patternmentioning

confidence: 99%

See 4 more Smart Citations

Experimental investigation of the grade efficiency of a zigzag separator

et al. 2020

View full text Add to dashboard Cite

An experimental study is conducted on a pilot-scale zigzag air separator (ZZS) to study the effects of varying the solid feed mass stream, the mean channel air velocity, and the number of channel segments onto the grade efficiency. Spherical glass beads are classified. A straight pipe separator model (PSM) is modified for the ZZS and fitted to the experimental data to estimate the relative cutpoint settling velocity, the separation sharpness, the relative rise velocity, the diffusion coefficient, and the particle loading. The proposed model is thoroughly investigated with regard to all important parameters, e.g. the estimated particle loading is shown to be more precise than the ratio of the solid and air mass stream, used in many publications. Finally, the relative rise velocity is shown to be only a function of the particle loading, making the experimental results within the model collapse.

show abstract

Section: Particle Movement Patternsupporting

confidence: 66%

Section: Particle Movement Patternmentioning

confidence: 62%

Section: Particle Movement Patternmentioning

confidence: 94%

Section: Previous Zigzag Separator Studiesmentioning

confidence: 99%

Section: Particle Movement Patternmentioning

confidence: 99%

See 3 more Smart Citations

Experimental investigation of the grade efficiency of a zigzag separator

et al. 2020

View full text Add to dashboard Cite

show abstract

Air Classifying

Furchner¹,

Zampini²

2009

Ullmann's Encyclopedia of Industrial Chemistry

View full text Add to dashboard Cite

Air classification is a process for the dry separation of a disperse phase according to the particle size, particle shape, or density, or, more precisely, the settling velocity. The settling velocity results from the balance of forces between the mass force and the drag force for every single particle. In a vertical gravity classifier particles move to the fine fraction if their settling velocity is lower than the air velocity, and to the coarse fraction if their settling velocity is higher than the air velocity. Particles in a deflector wheel behave similarly. The settling velocity must be calculated with the centrifugal acceleration in this case. Coarse classification in the range of 0.2 – 10 mm particle size is performed by gravity classifiers. Fine classification is generally performed in classifiers with deflector wheels. The fineness is adjusted by means of the speed of the wheel; increasing speed increases the centrifugal force and settling velocity. Fineness values of deflector wheel classifiers range from 1 to 200 µm. A peripheral speed of up to 150 m/s is used for finest products. Air classification is widely used in many industries and for many applications from laboratory scale to large‐scale processing. 1. Introduction 2. General Principles 2.1. Equilibrium of Forces at Individual Particles 2.1.1. Classifying in the Gravitational Field 2.1.2. Classifying in a Centrifugal Field 2.2. Separation of Bulk Material 2.3. Energy Requirement for Air Classifying 3. Machines for Air Classification 3.1. Gravity Classifiers 3.2. Inertial Classifiers 3.3. Internal Recirculation Air Classifiers 3.4. Deflector‐Wheel Classifiers 3.5. Classifier Mills 4. Application Examples for Air Classification 4.1. Cement 4.2. Fillers 4.3. Protein Shifting 4.4. Toner

show abstract

CFD in der chemischen Verfahrenstechnik aus industrieller Sicht

Birtigh

Werninger

Lauschke³

et al. 2000

Chem.-Ing.-Tech.

View full text Add to dashboard Cite

Die numerische Strömungssimulation (Computational Fluid Dynamics: CFD) etabliert sich zunehmend als Werkzeug zur Analyse und Auslegung in der chemischen Industrie. Aus Sicht der CFD‐Anwender der chemischen Großindustrie werden exemplarisch CFD‐Projekte aus verschiedenen Bereichen vorgestellt. Diese Bereiche sind einer Prozesskette nachempfunden: Transportieren, Mischen, Reagieren und Trennen von Stoffen. Es werden aus verfahrenstechnischer Sicht die wichtigsten Stufen und Entscheidungen bei dem Einsatz dieses Werkzeuges geschildert. Der Beitrag möchte Verständnis für die Möglichkeiten und Chancen, aber auch die Grenzen der numerischen Strömungssimulation vermitteln.

show abstract

Zur mehrphasigen Strömung in einem Zick-Zack-Sichter

Cited by 20 publications

References 5 publications

Experimental investigation of the grade efficiency of a zigzag separator

Experimental investigation of the grade efficiency of a zigzag separator

Air Classifying

CFD in der chemischen Verfahrenstechnik aus industrieller Sicht

Contact Info

Product

Resources

About