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ICESP VII CONFERENCE PAPER ABSTRACTS MN-1 SERIES

Held in Kyongju, Korea
September 20-25. 1998

The International Conference on Electrostatic Precipitation (ICESP) is the official conference of the International Society for Electrostatic Precipitation (ISESP).  

The following is a list of the Abstracts for the MN-1 Series papers from the VII ICESP Conference.  

MN01  Effect of Turbulence of Particle Transport inside a Wire-Cavity Plate Electrostatic Precipitator
Seok Joo Park and Sang Soo Kim
Department of Mechanical Engineering
Korea Advanced Institute ofScience and Technology

Abstract
 The effect of inlet turbulence conditions controlled by a mesh screen or a baffle on the particle behavior inside a wire – cavity plate ESP (electrostatic precipitator) and its collection efficiency was studied. Air mixed with alumina powder was fed into a wind tunnel.  The profiles of streamwise gas velocities and turbulence intensities were measured in the ESP with a laser Doppler anemometer.  A laser beam sheet visualized flow patterns for the zero applied voltage and trajectories of charged particles when a corona voltage was applied.  Collection efficiencies were measured with a particle counter, after calibrating concentration of particles provided into the wind tunnel by the laser scattering method.

The experimental results show that the flow with high turbulence intensity activates the entrainment of particles into the cavity below a critical corona voltage.  As a result, the higher turbulence may promote the collection efficiency of a wire – cavity plate ESP.

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MN02  Computation of Turbulent EHD and Particulate Flows in Wire-plate Electrostatic Precipitators
Bum Seog Choi
Thermal & Fluid Systems Department
Korea Institute ofMachinery and Materials (KIMM)
Clive A. J. Fletcher
CANCES
The University ofNSW

Abstract
Industrial electrostatic precipitation is a very complex process, which involves multiple-way interaction between the electric field, the fluid flow, and the particulate motion.  For the interactive coupling of these fields, a strongly coupled system of the governing equations has been solved.  A new turbulence model has been developed to account for electrically induced turbulence associated with the inhomogeneous and unsteady characteristics of negative corona discharges for a wire-plate precipitator configuration.  An electrical mixing concept is introduced to model the two-dimensionally averaged effect of the locally disturbed gas flow due to discrete and inhomogeneous tuft discharge.  In this model, an additional production or destruction term is included into the turbulent kinetic energy and dissipation rate equations.  The results of the computation showed that the electrostatic turbulence model gives much better agreement with the experimental data than the conventional RNG k _ ε turbulence model in predicting turbulent gas flows and particle distribution in an ESP.  Computations of turbulent particulate two-phase flows for poly-dispersed particles have been performed, and the results have been compared with the experimental measurements of the literature.

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MN03  Electrohydrodynamic Modeling of Fine Particle Collection in Electrostatic Precipitators
Andrew J Medlin and Clive A J Fletcher
CANCES
University ofNew South Wales
Richard Morrow
CSIRO Telecommunications .and Industrial Physics

Abstract
A novel and innovative computer model for electrostatic precipitation is presented.  The model is cast in a fully Eulerian formulation, including a high level of coupling between different aspects of the problem.  A key feature of the model is the manner in which particle charging processes are incorporated without the need to resort to Lagrangian particle tracking.

The model provides comprehensive spatial predictions of the gas electrohydrodynamic flow field, particle flow field, electric field-space charge distribution, particle number density and particle charge.

Spatial predictions of the electrical characteristics and particle distributions are provided.  The total efficiency of the model precipitator for various cases is calculated, and use of the model as a predictive tool for hypothetical precipitator designs is demonstrated.

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MN04  On the Modeling of Particle Transport in Electrostatic Precipitators Bum Seog Choi
Hans-Joachlm Schmid and Hans Buggisch
Institute of Mechanical Process Engineering and Mechanics
University of Karlsruhe

Abstract
In the literature one can find a lot of different models aiming to describe particle transport and precipitation in ESP’s.

This work focuses on the modeling of particle transport and how it is affected by the electrical conditions and the turbulent flow field.  The modeling of secondary effects, which may be very important for precipitation too, is omitted.  For this purposes an attempt to categorize models and to point out the major differences between these approaches is made.  There are mainly three different aspects to model: The electric field, the flow field and the turbulent particle transport.

The two main categories to model turbulent particle transport are the Eulerian approach, which is usually represented by the so-called ‘convection-diffusion-equation’ and the Lagrangian or particle-tracking approach which has become popular recently.

A quantitative comparison of results from implementations of both models yields that an Eulerian model may be well applicable for practical purposes, if it is implemented elaborately.  On the other hand Lagrangian models are superior, especially for scientific purposes, because the whole history of individual particles is know, but for the expense of much higher computational effort.

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MN05  Study on Electrode Configuration and Arrangement Inside ESP Using Numerical Simulation
Kazutaka Tomimatsu
Environment Plant & Machinery Engineering Department
Mitsubishi Heavy Industries, Ltd. Kobe Shipyard & Machinery Works
Yasutoshi Veda
Fluid Dynamics Laboratory .
Mitsubishi Heavy Industries, Ltd. Takasago R&D Center

Abstract
Electric current density distribution and spark voltage inside ESP (Electrostatic Precipitator) are greatly effected by the electrode configuration and its arrangement.  Since the spike type discharge electrode is normally applied for actual ESP, it is possible to enhance the collecting performance by optimizing the length, interval and configuration of spikes, so as to uniform the electric current density distribution, raising spark voltage or operating voltage and reducing the dead space of discharge current.

For EXP used for air cleaning such as traffic tunnels, it is necessary to increase the air velocity inside ESP to lower the capacity, because large air volume with low dust concentration should be treated.  In these cases, the optimization of electrode configuration and its arrangement has a very important role.

This paper summarizes how the electric current distribution.  V/I characteristics and spark voltage are effected by the electrode configuration and its arrangement, and also describes the effectiveness of numerical simulation for optimization of electrode configuration.

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