The influence of static electrification on dynamics and rheology of fluidized bed

Wolny, A.; Kaźmierczak, W.

doi:10.1016/0009-2509(93)85008-d

Cited by 18 publications

(11 citation statements)

References 4 publications

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“…The water consumption of the eliminator is low and leads to a relative humidity inferior than 5%. Consequently, this Table 1 Characteristics of the particles [2,3] Polyethylene powder 465 801 1381…”

Section: Experimental Apparatus and Proceduresmentioning

confidence: 99%

“…The granules are 3 mm in diameter. The particle size distribution of the powder (expressed in terms of surface) is shown in Table 1 where D [2,3] represents the surface/volume diameter and d(0.5) is the diameter which cut the total surface of particles in two equal parts. All products belong to group D of the Geldart classification [10].…”

Section: Experimental Apparatus and Proceduresmentioning

confidence: 99%

“…The first references to static electricity in fluidised beds go back to the early 1950s [1] and since that time, many studies have been made on the influence of static electricity on the fluidisation of insulating particles. It is found that electrostatic charges give rise to particle -wall and interparticle interactions of a magnitude such that they can affect the hydrodynamics of the fluidised bed [2,3]. This, for example, is a disadvantage for heat transfer between dielectric particles and an immersed heat exchange surface [4].…”

Section: Introductionmentioning

confidence: 99%

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Generation of static electricity during fluidisation of polyethylene and its elimination by air ionisation

et al. 2003

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Static electricity is the cause of many problems in the process industries, in particular, when handling powders and granules. The methods usually used to reduce static electricity involve the addition of antistatic agents, the increase of relative humidity or ionisation. But these solutions can give rise to other problems. The purpose of this paper is, first, to study the kinetics of electrostatic charging of polyethylene granules and powders in a fluidised bed and, second, to study the elimination of the static electricity using the same particles with a special supersonic injector producing a neutral cloud of positive and negative ions. The experiments involve taking samples of particles at various times and various locations in the bed and measuring the charge-to-mass ratio by means of a Faraday pail connected to an electrometer. It is found that the electrostatic charge increases during fluidisation up to a limiting value. Concerning the charges elimination, it is shown that ions ejected from the eliminator cannot penetrate into the bulk of particles. Only the particles on the upper surface of the bed are discharged. Thus, the efficiency of the supersonic injector for overall charge neutralisation depends on the movement of the particles in the bed and, in particular, the rate of renewal of the upper surface of the fluidised bed.

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Section: Experimental Apparatus and Proceduresmentioning

confidence: 99%

Section: Experimental Apparatus and Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Generation of static electricity during fluidisation of polyethylene and its elimination by air ionisation

et al. 2003

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“…It is possible that the low humidity fluidization air creates electrostatic charging of the bed since the granule is dielectric. Many researchers have shown that relative humidities below 70% can create an electrostatically charged environment which significantly influences the hydrodynamic behaviour of fluidized beds [29,30].…”

Section: Power Spectral Density (Psd)mentioning

confidence: 99%

The influence of vessel geometry on fluidized bed dryer hydrodynamics

Wormsbecker¹,

Ommen²,

Nijenhuis³

et al. 2009

Powder Technology

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“…Authors have considered acoustic and other vibrational methods for agglomerating, moving or dislodging particles [5][6][7][8][9][10][11]. Still others have focused on the orientation and mechanics of particles in the deposit [12][13][14][15], the fluid mechanics of the particulate processes [16][17][18], and the lift-off forces for particles [19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

On the Use of Vibration and Electric Fields to Fluidize and Disperse Particulate Matter

Noll¹

2000

Particulate Science and Technology

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Particulate matter is a statistical ensemble ofinteracting, non-identical particles. The fluidization and dispersal of dust is considered here from kinetic arguments and experiment. It is concluded that fluidization and dispersal of dust are independent physical processes arising from the action of vibration and steady stresses, respectively. Although the transition or correlation function for particulate systems is not as sharply defined as for the ideal-gas case, its general character is analogous with that for a condensing phase-transition withits critical condition broadened by the distribution of binding energies between the particles. The ratio of the net steady stress on the particles to the vibrational energy is the controlling factor in particle capture and entrainment.

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The influence of static electrification on dynamics and rheology of fluidized bed

Cited by 18 publications

References 4 publications

Generation of static electricity during fluidisation of polyethylene and its elimination by air ionisation

Generation of static electricity during fluidisation of polyethylene and its elimination by air ionisation

The influence of vessel geometry on fluidized bed dryer hydrodynamics

On the Use of Vibration and Electric Fields to Fluidize and Disperse Particulate Matter

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