1967:
82:
25:
154:
243:
146:
162:
spinner vanes. The secondary air flow enters from the top of the cyclone and moves downward toward the bottom, intercepting the particulate from the primary air. The secondary air flow also allows the collector to optionally be mounted horizontally, because it pushes the particulate toward the collection area, and does not rely solely on gravity to perform this function.
133:
stream, and thus strike the outside wall, then fall to the bottom of the cyclone where they can be removed. In a conical system, as the rotating flow moves towards the narrow end of the cyclone, the rotational radius of the stream is reduced, thus separating smaller and smaller particles. The cyclone geometry, together with
332:
separation of dust particulates. The pressure drop of multiple-cyclone separators collectors is higher than that of single-cyclone separators, requiring more energy to clean the same amount of air. A single-chamber cyclone separator of the same volume is more economical, but doesn't remove as much dust.
1659:
1482:
Notice that if the density of the fluid is greater than the density of the particle, the motion is (-), toward the center of rotation and if the particle is denser than the fluid, the motion is (+), away from the center. In most cases, this solution is used as guidance in designing a separator, while
340:
This type of cyclone uses a secondary air flow, injected into the cyclone to accomplish several things. The secondary air flow increases the speed of the cyclonic action making the separator more efficient; it intercepts the particulate before it reaches the interior walls of the unit; and it forces
1942:
The above equations are limited in many regards. For example, the geometry of the separator is not considered, the particles are assumed to achieve a steady state and the effect of the vortex inversion at the base of the cyclone is also ignored, all behaviours which are unlikely to be achieved in a
161:
An alternative cyclone design uses a secondary air flow within the cyclone to keep the collected particles from striking the walls, to protect them from abrasion. The primary air flow containing the particulates enters from the bottom of the cyclone and is forced into spiral rotation by stationary
1330:
331:
Multiple-cyclone separators remove more dust than single cyclone separators because the individual cyclones have a greater length and smaller diameter. The longer length provides longer residence time while the smaller diameter creates greater centrifugal force. These two factors result in better
132:
pattern, beginning at the top (wide end) of the cyclone and ending at the bottom (narrow) end before exiting the cyclone in a straight stream through the center of the cyclone and out the top. Larger (denser) particles in the rotating stream have too much inertia to follow the tight curve of the
327:
Multiple-cyclone separators consist of a number of small-diameter cyclones, operating in parallel and having a common gas inlet and outlet, as shown in the figure, and operate on the same principle as single cyclone separators—creating an outer downward vortex and an ascending inner vortex.
141:
of the cyclone. This is the size of particle that will be removed from the stream with a 50% efficiency. Particles larger than the cut point will be removed with a greater efficiency, and smaller particles with a lower efficiency as they separate with more difficulty or can be subject to
1946:
More complete models exist, as many authors have studied the behaviour of cyclone separators., simplified models allowing a quick calculation of the cyclone, with some limitations, have been developed for common applications in process industries. Numerical modelling using
311:
Single-cyclone separators create a dual vortex to separate coarse from fine dust. The main vortex spirals downward and carries most of the coarser dust particles. The inner vortex, created near the bottom of the cyclone, spirals upward and carries finer dust particles.
341:
the separated particulate toward the collection area. The secondary air flow protects the separator from particulate abrasion and allows the separator to be installed horizontally because gravity is not depended upon to move the separated particulate downward.
206:
for separating the grease from the exhaust air in extraction hoods. Smaller cyclones are used to separate airborne particles for analysis. Some are small enough to be worn clipped to clothing, and are used to separate respirable particles for later analysis.
1476:
170:
Cyclone separators are found in all types of power and industrial applications, including pulp and paper plants, cement plants, steel mills, petroleum coke plants, metallurgical plants, saw mills and other kinds of facilities that process dust.
1492:
1154:
721:
The buoyant force component is in the inward radial direction. It is in the opposite direction to the particle's centrifugal force because it is on a volume of fluid that is missing compared to the surrounding fluid. Using
914:
714:
948:
is equal to the volume of the particle (as opposed to the velocity). Determining the outward radial motion of each particle is found by setting Newton's second law of motion equal to the sum of these forces:
157:
Airflow diagram for
Aerodyne cyclone in horizontal position, an alternate design. Secondary air flow is injected to reduce wall abrasion, and to help move collected particulates to hopper for extraction.
825:
2246:
D. Benoni, C.L. Briens, T. Baron, E. Duchesne and T.M. Knowlton, 1994, "A procedure to determine particle agglomeration in a fluidized bed and its effect on entrainment", Powder
Technology, 78, 33-42.
1036:
1754:
1902:
630:
542:
1934:, possibly based upon the injection angle, and a cutoff radius, a characteristic particle filtering radius can be estimated, above which particles will be removed from the gas stream.
353:
and particle transport equations can be used to describe the behaviour of a cyclone. The air in a cyclone is initially introduced tangentially into the cyclone with an inlet velocity
1083:
1830:
1144:
1368:
321:
1951:
has also been used extensively in the study of cyclonic behaviour. A major limitation of any fluid mechanics model for cyclone separators is the inability to predict the
1085:
is zero. This occurs when the radial velocity has caused enough drag force to counter the centrifugal and buoyancy forces. This simplification changes our equation to:
747:
572:
381:
1932:
1784:
1689:
1360:
946:
470:
443:
221:
Analogous devices for separating particles or solids from liquids are called hydrocyclones or hydroclones. These may be used to separate solid waste from water in
1654:{\displaystyle {\frac {dV_{r}}{dt}}+{\frac {9}{2}}{\frac {\mu }{\rho _{p}r_{p}^{2}}}V_{r}-\left(1-{\frac {\rho _{f}}{\rho _{p}}}\right){\frac {V_{t}^{2}}{r}}=0}
404:
1325:{\displaystyle -6\pi r_{p}\mu V_{r}+{\frac {4}{3}}\pi r_{p}^{3}{\frac {V_{t}^{2}}{r}}\rho _{p}-{\frac {4}{3}}\pi r_{p}^{3}{\frac {V_{t}^{2}}{r}}\rho _{f}=0}
831:
418:
forces. Given that the fluid velocity is moving in a spiral the gas velocity can be broken into two component velocities: a tangential component,
636:
1835:
This means that the established feed velocity controls the vortex rate inside the cyclone, and the velocity at an arbitrary radius is therefore:
1486:
In non-equilibrium conditions when radial acceleration is not zero, the general equation from above must be solved. Rearranging terms we obtain
2259:
116:
are used to separate mixtures of solids and fluids. The method can also be used to separate fine droplets of liquid from a gaseous stream.
2081:
Martin Huard, Cedric Briens, Franco
Berruti, Thierry Gauthier, 2010, "A Review of Rapid Gas-Solid Separation Techniques", IJCRE, 8, R1.
2195:
2294:
755:
383:. Assuming that the particle is spherical, a simple analysis to calculate critical separation particle sizes can be established.
2299:
476:, the drag force in the outward radial direction that is opposing the outward velocity on any particle in the inlet stream is:
1041:
To simplify this, we can assume the particle under consideration has reached "terminal velocity", i.e., that its acceleration
2264:
2100:
955:
149:
Airflow diagram for
Aerodyne cyclone in standard vertical position. Secondary air flow is injected to reduce wall abrasion.
386:
If one considers an isolated particle circling in the upper cylindrical component of the cyclone at a rotational radius of
264:
2309:
2057:
1841:
1991:
290:
68:
46:
272:
39:
580:
2164:"Evaluation of cyclone geometry and its influence on performance parameters by computational fluid dynamics (CFD)"
2043:"Solid Gas separation methods - Industrial dust collectors - cyclone - scrubbers - filtration - PowderProcess.net"
1966:
482:
194:
preheaters. Cyclones are increasingly used in the household, as the core technology in bagless types of portable
2006:
268:
2284:
2319:
2304:
1948:
1044:
1792:
1694:
1090:
1471:{\displaystyle V_{r}={\frac {2}{9}}{\frac {r_{p}^{2}}{\mu }}{\frac {V_{t}^{2}}{r}}(\rho _{p}-\rho _{f})}
2314:
1955:
of fine particles with larger particles, which has a great impact on cyclone collection efficiency.
2289:
253:
215:
33:
2141:
257:
2001:
725:
550:
199:
50:
1759:
Experimentally it is found that the velocity component of rotational flow is proportional to
356:
2204:
1952:
1910:
1762:
1667:
1338:
924:
448:
421:
218:) to achieve fast separation of the catalyst particles from the reacting gases and vapors.
134:
81:
2042:
142:
re-entrainment when the air vortex reverses direction to move in direction of the outlet.
8:
574:
as the particle's density, the centrifugal component in the outward radial direction is:
203:
195:
389:
2324:
2096:
411:
2197:
PhD Thesis: On the
Potential of Large Eddy Simulation to Simulate Cyclone Separators
2180:
2163:
2119:
PhD thesis: Experimental and
Analytical Study of the Vortex in the Cyclone Separator
2175:
2123:
2016:
226:
2228:
350:
303:
The most common types of centrifugal, or inertial, collectors in use today are:
2011:
1986:
1972:
473:
407:
183:
2269:
2061:
2278:
2021:
909:{\displaystyle =-{\frac {4\pi r_{p}^{3}}{3}}{\frac {V_{t}^{2}}{r}}\rho _{f}.}
16:
Method of removing particulates from a fluid stream through vortex separation
2117:
1691:
is distance per time, this is a 2nd order differential equation of the form
709:{\displaystyle ={\frac {4}{3}}\pi \rho _{p}r_{p}^{3}{\frac {V_{t}^{2}}{r}}.}
1996:
211:
105:
191:
93:
2127:
406:
from the cyclone's central axis, the particle is therefore subjected to
1981:
222:
124:
A high-speed rotating (air)flow is established within a cylindrical or
97:
153:
242:
415:
145:
109:
85:
A partially demolished factory with dominating cyclonic separators
349:
As the cyclone is essentially a two phase particle-fluid system,
179:
175:
125:
113:
2230:
PhD Thesis: Droplet collection in a scaled-up rotating separator
187:
101:
320:
129:
104:
separation. When removing particulate matter from liquid, a
820:{\displaystyle F_{b}=-V_{p}\rho _{f}{\frac {V_{t}^{2}}{r}}}
2161:
1483:
actual performance is evaluated and modified empirically.
2162:
Martignoni, W. P.; Bernardo, S.; Quintani, C. L. (2007).
2142:"Cyclone design - Step by step guide - Powderprocess.net"
202:. Cyclones are also used in industrial and professional
1031:{\displaystyle m{\frac {dV_{r}}{dt}}=F_{d}+F_{c}+F_{b}}
2007:
Rust (fungus) § Management of rust fungi diseases
96:
from an air, gas or liquid stream, without the use of
1913:
1844:
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639:
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392:
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1962:
749:
for the density of the fluid, the buoyant force is:
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1824:
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2122:(Thesis). Massachusetts Institute of Technology.
108:is used; while from gas, a gas cyclone is used.
2276:
2115:
1897:{\displaystyle U_{r}=U_{in}{\frac {r}{R_{in}}}.}
335:
182:from extracted air. Cyclones are also used in
315:
625:{\displaystyle F_{c}=m{\frac {V_{t}^{2}}{r}}}
306:
537:{\displaystyle F_{d}=-6\pi r_{p}\mu V_{r}.}
445:, and an outward radial velocity component
271:. Unsourced material may be challenged and
128:container called a cyclone. Air flows in a
2260:High Efficiency Horizontal Dust Collection
2179:
2168:Brazilian Journal of Chemical Engineering
2090:
291:Learn how and when to remove this message
69:Learn how and when to remove this message
152:
144:
80:
32:This article includes a list of general
186:to separate oils and gases, and in the
2277:
1943:cyclone at real operating conditions.
2084:
1937:
2058:"How cyclone grease separators work"
2055:
1078:{\displaystyle {\frac {dV_{r}}{dt}}}
269:adding citations to reliable sources
236:
18:
2093:Introduction to particle technology
1825:{\displaystyle V_{t}\propto r^{2}.}
1749:{\displaystyle x''+c_{1}x'+c_{2}=0}
1139:{\displaystyle F_{d}+F_{c}+F_{b}=0}
210:Similar separators are used in the
13:
319:
38:it lacks sufficient corresponding
14:
2336:
1992:Helikon vortex separation process
344:
174:Large scale cyclones are used in
1965:
1907:Subsequently, given a value for
241:
23:
2240:
2181:10.1590/S0104-66322007000100008
2295:Pollution control technologies
2270:alternate link to cited patent
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2188:
2155:
2134:
2109:
2075:
2049:
2035:
1465:
1439:
1:
2300:Air pollution control systems
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336:Secondary-air-flow separators
1949:computational fluid dynamics
119:
7:
1958:
316:Multiple-cyclone separators
10:
2341:
2310:Waste treatment technology
2265:patent 2377524 (June 1945)
190:industry as components of
2116:Smith, J. L. Jr. (1959).
742:{\displaystyle \rho _{f}}
567:{\displaystyle \rho _{p}}
307:Single-cyclone separators
2028:
232:
216:Fluid catalytic cracking
92:is a method of removing
2095:. John Wiley and Sons.
200:central vacuum cleaners
165:
53:more precise citations.
2002:Hydrodynamic separator
1928:
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376:{\displaystyle V_{in}}
324:
158:
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86:
1929:
1927:{\displaystyle V_{t}}
1899:
1827:
1781:
1779:{\displaystyle r^{2}}
1751:
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1684:{\displaystyle V_{r}}
1656:
1473:
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1355:{\displaystyle V_{r}}
1327:
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1080:
1033:
943:
941:{\displaystyle V_{p}}
911:
822:
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467:
465:{\displaystyle V_{r}}
440:
438:{\displaystyle V_{t}}
401:
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84:
2285:Solid-gas separation
1911:
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265:improve this section
135:volumetric flow rate
2320:Particle technology
2305:Particulate control
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214:industry (e.g. for
204:kitchen ventilation
90:Cyclonic separation
2091:Rhodes M. (1998).
1938:Alternative models
1924:
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1148:Which expands to:
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2102:978-0-471-98483-2
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399:{\displaystyle r}
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2315:Gas technologies
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2203:. Archived from
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2131:
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2060:. Archived from
2053:
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2039:
2017:Spiral separator
1975:
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1969:
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351:fluid mechanics
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286:
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196:vacuum cleaners
168:
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45:Please help to
44:
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2048:
2033:
2032:
2030:
2027:
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2024:
2019:
2014:
2012:Spark arrestor
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2004:
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1989:
1987:Dust collector
1984:
1978:
1977:
1976:
1973:Physics portal
1960:
1957:
1939:
1936:
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1101:
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1017:
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1008:
1004:
999:
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991:
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967:
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931:
921:In this case,
919:
918:
917:
916:
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900:
896:
890:
885:
880:
876:
868:
862:
857:
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804:
800:
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788:
782:
778:
774:
771:
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762:
736:
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719:
718:
717:
716:
705:
700:
695:
690:
686:
678:
673:
669:
663:
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650:
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619:
614:
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533:
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524:
520:
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504:
501:
498:
493:
489:
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455:
432:
428:
395:
370:
367:
363:
346:
345:Cyclone theory
343:
337:
334:
317:
314:
308:
305:
299:
298:
249:
247:
240:
234:
231:
184:oil refineries
167:
164:
137:, defines the
121:
118:
77:
76:
31:
29:
22:
15:
9:
6:
4:
3:
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2210:on 2007-07-09
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2064:on 2017-04-21
2063:
2059:
2052:
2044:
2038:
2034:
2023:
2022:Trickle valve
2020:
2018:
2015:
2013:
2010:
2008:
2005:
2003:
2000:
1998:
1995:
1993:
1990:
1988:
1985:
1983:
1980:
1979:
1974:
1968:
1963:
1956:
1954:
1953:agglomeration
1950:
1944:
1935:
1919:
1915:
1891:
1884:
1881:
1877:
1873:
1866:
1863:
1859:
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1846:
1838:
1837:
1836:
1819:
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1797:
1789:
1788:
1787:
1786:, therefore:
1771:
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1727:
1723:
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1177:
1172:
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1164:
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1149:
1146:
1133:
1130:
1125:
1121:
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1069:
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980:
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812:
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750:
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693:
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645:
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585:
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576:
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457:
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384:
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342:
333:
329:
322:
313:
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295:
292:
284:
274:
270:
266:
260:
259:
255:
250:This section
248:
244:
239:
238:
230:
228:
224:
219:
217:
213:
208:
205:
201:
197:
193:
189:
185:
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177:
172:
163:
155:
147:
143:
140:
136:
131:
127:
117:
115:
111:
107:
103:
99:
95:
91:
83:
73:
70:
62:
52:
48:
42:
41:
35:
30:
21:
20:
2242:
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2223:
2212:. Retrieved
2205:the original
2196:
2190:
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2145:. Retrieved
2136:
2128:1721.1/11792
2118:
2111:
2092:
2086:
2077:
2066:. Retrieved
2062:the original
2051:
2037:
1997:Hydrocyclone
1945:
1941:
1906:
1834:
1758:
1663:
1485:
1481:
1335:Solving for
1334:
1147:
1087:
1040:
920:
720:
546:
385:
348:
339:
330:
326:
310:
302:
287:
278:
263:Please help
251:
220:
212:oil refining
209:
173:
169:
160:
138:
123:
112:effects and
106:hydrocyclone
94:particulates
89:
88:
65:
59:October 2018
56:
37:
474:Stokes' law
472:. Assuming
412:centrifugal
51:introducing
2279:Categories
2254:References
2214:2009-06-20
2068:2015-10-07
2056:Jeven Oy.
1982:Centrifuge
223:wastewater
178:to remove
110:Rotational
100:, through
34:references
2174:: 83–94.
1807:∝
1608:ρ
1598:ρ
1592:−
1581:−
1544:ρ
1539:μ
1457:ρ
1453:−
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1267:π
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773:−
731:ρ
658:ρ
654:π
556:ρ
519:μ
506:π
500:−
252:does not
139:cut point
120:Operation
2325:Aerosols
2147:26 March
1959:See also
1724:′
1703:″
1362:we have
281:May 2024
176:sawmills
416:buoyant
273:removed
258:sources
180:sawdust
130:helical
126:conical
114:gravity
98:filters
47:improve
2099:
1664:Since
547:Using
414:, and
188:cement
102:vortex
36:, but
2234:(PDF)
2208:(PDF)
2201:(PDF)
2029:Notes
233:Types
2149:2023
2097:ISBN
408:drag
256:any
254:cite
225:and
198:and
192:kiln
166:Uses
2176:doi
2124:hdl
267:by
2281::
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2170:.
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2045:.
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1892:.
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288:(
283:)
279:(
275:.
261:.
72:)
66:(
61:)
57:(
43:.
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