Kinematic coagulation of charged droplets in an alternating electric field

Kari Lehtinen, Jorma Jokiniemi, Esko Kauppinen, Jukka Hautanen

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

An analytic-numerical model has been developed to study kinematic coagulation caused by the vibrational motion of charged particles in an alternating electric field. The primary aim of this study was to find out the reduction in the number concentration of fine particles of diameter 0.1 μm-1.0 μm caused by collisions with larger, supermicron particles. Three cases are considered: (1) unipolar charging, (2) fine particles are neutral, and (3) fine particles and large particles have opposite polarity. We find out that in cases 1 and 2 the rate of kinematic coagulation in negligible and in case 3 significant. The results are demonstrated with two sample calculations with total mass loadings of 2 and 20 g/m3. In the former, where the mass median diameter is 3.0 μm, we discover a 20%-50% reduction in number concentration of particles in the range 0.5–1.0 μm and less significant reduction in smaller particles. The latter (MMD = 6.0 μm) represents power plant conditions. In this case the reduction varies from 10% (0.1 μm) to 95% (1.0 μm).
Original languageEnglish
Pages (from-to)422-430
JournalAerosol Science and Technology
Volume23
Issue number3
DOIs
Publication statusPublished - 1995
MoE publication typeA1 Journal article-refereed

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Coagulation
coagulation
droplet
electric field
Kinematics
kinematics
Electric fields
Charged particles
Numerical models
Power plants
particle
power plant
collision

Cite this

Lehtinen, Kari ; Jokiniemi, Jorma ; Kauppinen, Esko ; Hautanen, Jukka. / Kinematic coagulation of charged droplets in an alternating electric field. In: Aerosol Science and Technology. 1995 ; Vol. 23, No. 3. pp. 422-430.
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title = "Kinematic coagulation of charged droplets in an alternating electric field",
abstract = "An analytic-numerical model has been developed to study kinematic coagulation caused by the vibrational motion of charged particles in an alternating electric field. The primary aim of this study was to find out the reduction in the number concentration of fine particles of diameter 0.1 μm-1.0 μm caused by collisions with larger, supermicron particles. Three cases are considered: (1) unipolar charging, (2) fine particles are neutral, and (3) fine particles and large particles have opposite polarity. We find out that in cases 1 and 2 the rate of kinematic coagulation in negligible and in case 3 significant. The results are demonstrated with two sample calculations with total mass loadings of 2 and 20 g/m3. In the former, where the mass median diameter is 3.0 μm, we discover a 20{\%}-50{\%} reduction in number concentration of particles in the range 0.5–1.0 μm and less significant reduction in smaller particles. The latter (MMD = 6.0 μm) represents power plant conditions. In this case the reduction varies from 10{\%} (0.1 μm) to 95{\%} (1.0 μm).",
author = "Kari Lehtinen and Jorma Jokiniemi and Esko Kauppinen and Jukka Hautanen",
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Kinematic coagulation of charged droplets in an alternating electric field. / Lehtinen, Kari; Jokiniemi, Jorma; Kauppinen, Esko; Hautanen, Jukka.

In: Aerosol Science and Technology, Vol. 23, No. 3, 1995, p. 422-430.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Kinematic coagulation of charged droplets in an alternating electric field

AU - Lehtinen, Kari

AU - Jokiniemi, Jorma

AU - Kauppinen, Esko

AU - Hautanen, Jukka

N1 - Project code: YDI3037 Project code: ket3423

PY - 1995

Y1 - 1995

N2 - An analytic-numerical model has been developed to study kinematic coagulation caused by the vibrational motion of charged particles in an alternating electric field. The primary aim of this study was to find out the reduction in the number concentration of fine particles of diameter 0.1 μm-1.0 μm caused by collisions with larger, supermicron particles. Three cases are considered: (1) unipolar charging, (2) fine particles are neutral, and (3) fine particles and large particles have opposite polarity. We find out that in cases 1 and 2 the rate of kinematic coagulation in negligible and in case 3 significant. The results are demonstrated with two sample calculations with total mass loadings of 2 and 20 g/m3. In the former, where the mass median diameter is 3.0 μm, we discover a 20%-50% reduction in number concentration of particles in the range 0.5–1.0 μm and less significant reduction in smaller particles. The latter (MMD = 6.0 μm) represents power plant conditions. In this case the reduction varies from 10% (0.1 μm) to 95% (1.0 μm).

AB - An analytic-numerical model has been developed to study kinematic coagulation caused by the vibrational motion of charged particles in an alternating electric field. The primary aim of this study was to find out the reduction in the number concentration of fine particles of diameter 0.1 μm-1.0 μm caused by collisions with larger, supermicron particles. Three cases are considered: (1) unipolar charging, (2) fine particles are neutral, and (3) fine particles and large particles have opposite polarity. We find out that in cases 1 and 2 the rate of kinematic coagulation in negligible and in case 3 significant. The results are demonstrated with two sample calculations with total mass loadings of 2 and 20 g/m3. In the former, where the mass median diameter is 3.0 μm, we discover a 20%-50% reduction in number concentration of particles in the range 0.5–1.0 μm and less significant reduction in smaller particles. The latter (MMD = 6.0 μm) represents power plant conditions. In this case the reduction varies from 10% (0.1 μm) to 95% (1.0 μm).

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JF - Aerosol Science and Technology

SN - 0278-6826

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