In this study, the performance characteristics of electro-cyclone with different inlet shapes, such as helical, tangential and involute, were experimentally investigated. The range of particle size has 0.3 to 6 μm and the inlet velocities are 10, 15, 20, and 25 m/s. Particles used in this experiment are JIS Class 11 test powder which have the density of 1.9~2.1 g/cm3 and the mass median diameter of 2.3 μm. An electrocyclone has discharge wire which was inserted in the middle of vortex-finder. The length, diameter and material of discharge wire have 20 mm, 0.6 mm and SUS304, respectively. The discharge wire was applied with a voltage of 10 kV. The collection efficiency is calculated by the particle size distribution of the upstream and downstream using a laser optical particle counter. Pressure drops were measured between two pressure taps which were located at the inlet and outlet ducts of electrocyclone using a micromanometer. For the case of the involute type, due to a minimum turbulence, the retention time of particles becomes long in electrocyclone and particles have more chances to be charged. However, the experimental results show that a helical shape has a better collection effect than the other shapes. And the pressure drop of the involute shape for a given inlet velocity is smaller than the other shapes. The collection efficiency and the pressure drop with various inlet shapes and velocity changes in electrocyclone are graphically depicted.

1.
John, C. M., John, D. M., and Louis, T., 1995, Handbook of air pollution control engineering and technology, LEWIS, Florida.
2.
Zhu
Y. F.
, and
Lee
K. W.
,
1999
, “
Experimental study on small cyclones operating at high flow rates
,”
Aerosol Sci. Technol.
,
30
(
10
), pp.
1303
1315
.
3.
Lim
K. S.
,
Kim
H. S.
,
Park
Y. O.
, and
Lee
K. W.
,
2005
Particle Collection and Concentration for Cyclone Concentrators
,”
Aerosol Sci. Technol.
,
39
, pp.
113
123
.
4.
DeOtte
R. E.
,
1990
, “
A model for the prediction of the collection efficiency characteristics of a small, cylindrical aerosol sampling cyclone
,”
Aerosol Sci. Technol.
,
12
, pp.
1055
1066
.
5.
Moore
M. E.
, and
Mcfarland
A. R.
,
1996
, “
Design methodology for multiple inlet cyclones
,”
Environ. Sci. Technol.
,
30
, pp.
271
276
.
6.
Gautam
M.
, and
Streenath
A.
,
1997
, “
Performance of a repairable multi inlet cyclone sampler
,”
J. Aerosol Sci.
,
28
(
7
), pp.
1265
1281
.
7.
Lim
K. S.
,
Kwon
S. B.
, and
Lee
K. W.
,
2003
, “
Characteristics of the collection efficiency for a double inlet cyclone with clean air
,”
J. Aerosol Sci.
,
34
, pp.
1085
1095
.
8.
Stairmand
C. J.
,
1951
, “
Design and performance of cyclone separators
,”
Trsns. Inst. Chem. Eng.
,
29
, pp.
356
383
.
9.
Shepherd
C. B.
, and
Lapple
C. E.
,
1940
, “
Flow pattern and pressure drop in dust cyclone separator
,”
Ind. Eng. Chem.
,
32
, pp.
1246
1256
.
This content is only available via PDF.
You do not currently have access to this content.