Segregation in water fluidized beds of sand particles
Abstract
Fluidization experiments were conducted on four fractions of filtration (quartz) sand using columns of 144 and 64 mm i.d. The size distribution of the fractions obtained by sieving followed an approximately modified normal (Gaussian) particle size distribution with respect to the projected particle diameter, while the shape factor decreased linearly with increasing projected particle diameter. The expansion characteristics of the sand particles followed a Richardson-Zaki relationship. The intercept velocity, i.e., the extrapolated value of the fluid superficial velocity to epsilon=1 on the plot log (U) vs. log (epsilon), agreed quite well with the experimentally determined mean free settling velocity of the cloud of about 30 randomly selected particles. During fluidization, the beds were hydraulically separated into 10 sub-fractions, which are then analyzed. For the mixture d(p)=0.75-1.25 mm during fluidization at an overall bed expansion of 35%, the bed partially segregated since, rem...arkably, the smallest particles were concentrated at the top, while the largest particles were concentrated in the bottom zone. In the remaining part of the bed (about 80% of total mass), the particles were well mixed. Similar experiments were performed with sand mixtures d(p)=1.60-2.00 mm, d(p)=1.40-2.00 mm and d(p)=1.166-2.00 mm. By analyzing the particle size distribution at the bottom and at the top of the bed, it was concluded that the bed was well mixed if the sieving ratio of the largest to smallest sieve opening was less than about 1.5.
Keywords:
Fluidization / Liquid-solids / Sand / SegregationSource:
Powder Technology, 2013, 235, 173-179Publisher:
- Elsevier Science Sa, Lausanne
Funding / projects:
- The development of efficient chemical-engineering processes based on the transport phenomena research and process intensification principles (RS-MESTD-Basic Research (BR or ON)-172022)
DOI: 10.1016/j.powtec.2012.10.004
ISSN: 0032-5910
WoS: 000316039400022
Scopus: 2-s2.0-84871514817
Collections
Institution/Community
IHTMTY - JOUR AU - Đuriš, Mihal AU - Garić Grulović, Radmila AU - Arsenijević, Zorana AU - Jaćimovski, Darko AU - Grbavčić, Željko PY - 2013 UR - https://cer.ihtm.bg.ac.rs/handle/123456789/1291 AB - Fluidization experiments were conducted on four fractions of filtration (quartz) sand using columns of 144 and 64 mm i.d. The size distribution of the fractions obtained by sieving followed an approximately modified normal (Gaussian) particle size distribution with respect to the projected particle diameter, while the shape factor decreased linearly with increasing projected particle diameter. The expansion characteristics of the sand particles followed a Richardson-Zaki relationship. The intercept velocity, i.e., the extrapolated value of the fluid superficial velocity to epsilon=1 on the plot log (U) vs. log (epsilon), agreed quite well with the experimentally determined mean free settling velocity of the cloud of about 30 randomly selected particles. During fluidization, the beds were hydraulically separated into 10 sub-fractions, which are then analyzed. For the mixture d(p)=0.75-1.25 mm during fluidization at an overall bed expansion of 35%, the bed partially segregated since, remarkably, the smallest particles were concentrated at the top, while the largest particles were concentrated in the bottom zone. In the remaining part of the bed (about 80% of total mass), the particles were well mixed. Similar experiments were performed with sand mixtures d(p)=1.60-2.00 mm, d(p)=1.40-2.00 mm and d(p)=1.166-2.00 mm. By analyzing the particle size distribution at the bottom and at the top of the bed, it was concluded that the bed was well mixed if the sieving ratio of the largest to smallest sieve opening was less than about 1.5. PB - Elsevier Science Sa, Lausanne T2 - Powder Technology T1 - Segregation in water fluidized beds of sand particles VL - 235 SP - 173 EP - 179 DO - 10.1016/j.powtec.2012.10.004 ER -
@article{ author = "Đuriš, Mihal and Garić Grulović, Radmila and Arsenijević, Zorana and Jaćimovski, Darko and Grbavčić, Željko", year = "2013", abstract = "Fluidization experiments were conducted on four fractions of filtration (quartz) sand using columns of 144 and 64 mm i.d. The size distribution of the fractions obtained by sieving followed an approximately modified normal (Gaussian) particle size distribution with respect to the projected particle diameter, while the shape factor decreased linearly with increasing projected particle diameter. The expansion characteristics of the sand particles followed a Richardson-Zaki relationship. The intercept velocity, i.e., the extrapolated value of the fluid superficial velocity to epsilon=1 on the plot log (U) vs. log (epsilon), agreed quite well with the experimentally determined mean free settling velocity of the cloud of about 30 randomly selected particles. During fluidization, the beds were hydraulically separated into 10 sub-fractions, which are then analyzed. For the mixture d(p)=0.75-1.25 mm during fluidization at an overall bed expansion of 35%, the bed partially segregated since, remarkably, the smallest particles were concentrated at the top, while the largest particles were concentrated in the bottom zone. In the remaining part of the bed (about 80% of total mass), the particles were well mixed. Similar experiments were performed with sand mixtures d(p)=1.60-2.00 mm, d(p)=1.40-2.00 mm and d(p)=1.166-2.00 mm. By analyzing the particle size distribution at the bottom and at the top of the bed, it was concluded that the bed was well mixed if the sieving ratio of the largest to smallest sieve opening was less than about 1.5.", publisher = "Elsevier Science Sa, Lausanne", journal = "Powder Technology", title = "Segregation in water fluidized beds of sand particles", volume = "235", pages = "173-179", doi = "10.1016/j.powtec.2012.10.004" }
Đuriš, M., Garić Grulović, R., Arsenijević, Z., Jaćimovski, D.,& Grbavčić, Ž.. (2013). Segregation in water fluidized beds of sand particles. in Powder Technology Elsevier Science Sa, Lausanne., 235, 173-179. https://doi.org/10.1016/j.powtec.2012.10.004
Đuriš M, Garić Grulović R, Arsenijević Z, Jaćimovski D, Grbavčić Ž. Segregation in water fluidized beds of sand particles. in Powder Technology. 2013;235:173-179. doi:10.1016/j.powtec.2012.10.004 .
Đuriš, Mihal, Garić Grulović, Radmila, Arsenijević, Zorana, Jaćimovski, Darko, Grbavčić, Željko, "Segregation in water fluidized beds of sand particles" in Powder Technology, 235 (2013):173-179, https://doi.org/10.1016/j.powtec.2012.10.004 . .