Prediction of single particle settling velocities through liquid fluidized beds
Abstract
Single particle settling velocities through water fluidized beds of mono-sized glass spheres (dp = 0.645, 1.20, 1.94, 2.98 and 5 mm in diameter) were studied experimentally using a column, 40 mm in diameter. The settling spherical particles (Dp = 10 and 19.5 mm) had different densities (1237 to 8320 kg/m3), while the settling particles (Dp = 5 and 2.98 mm) were glass spheres. The pseudo-fluid model, which considers a liquid fluidized bed as a homogenous pseudo-fluid, predicts single particle settling velocities quite well if the ratio Dp/dp is larger than about 10. With decreasing ratio Dp/dp, the overall friction between the settling particle and the fluidized media increases. A method for predicting single particle settling velocities through a liquid fluidized bed is proposed and discussed. Following the approach of Van der Wielen et al. [L.A.M. Van der Wielen, M.H.H Van Dam, K.C.A.M. Van Luyben, On the relative motion of a particle in a swarm of different particles, Chem. Eng. Sci.... 51 (2006) 995-1008], the overall friction is decomposed into a particle-fluid and a particle-particle component. The effective buoyancy force is calculated using the transition function proposed by Ruzicka [M.C. Ruzicka, On buoyancy in dispersion, Chem. Eng. Sci. 61 (2006) 2437-2446]. A simple model for predicting the collision force is proposed, as well as a correlation for the collision coefficient. The mean absolute deviation between the experimental and calculated slip velocities was 5.08%.
Keywords:
Effective density / Liquid fluidized bed / Pseudo-fluid / Settling velocitySource:
Powder Technology, 2009, 190, 3, 283-291Funding / projects:
- Research Council of Serbia
DOI: 10.1016/j.powtec.2008.08.005
ISSN: 0032-5910
WoS: 000264471800001
Scopus: 2-s2.0-60349094391
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Institution/Community
IHTMTY - JOUR AU - Grbavčić, Željko AU - Arsenijević, Zorana AU - Garić Grulović, Radmila PY - 2009 UR - https://cer.ihtm.bg.ac.rs/handle/123456789/604 AB - Single particle settling velocities through water fluidized beds of mono-sized glass spheres (dp = 0.645, 1.20, 1.94, 2.98 and 5 mm in diameter) were studied experimentally using a column, 40 mm in diameter. The settling spherical particles (Dp = 10 and 19.5 mm) had different densities (1237 to 8320 kg/m3), while the settling particles (Dp = 5 and 2.98 mm) were glass spheres. The pseudo-fluid model, which considers a liquid fluidized bed as a homogenous pseudo-fluid, predicts single particle settling velocities quite well if the ratio Dp/dp is larger than about 10. With decreasing ratio Dp/dp, the overall friction between the settling particle and the fluidized media increases. A method for predicting single particle settling velocities through a liquid fluidized bed is proposed and discussed. Following the approach of Van der Wielen et al. [L.A.M. Van der Wielen, M.H.H Van Dam, K.C.A.M. Van Luyben, On the relative motion of a particle in a swarm of different particles, Chem. Eng. Sci. 51 (2006) 995-1008], the overall friction is decomposed into a particle-fluid and a particle-particle component. The effective buoyancy force is calculated using the transition function proposed by Ruzicka [M.C. Ruzicka, On buoyancy in dispersion, Chem. Eng. Sci. 61 (2006) 2437-2446]. A simple model for predicting the collision force is proposed, as well as a correlation for the collision coefficient. The mean absolute deviation between the experimental and calculated slip velocities was 5.08%. T2 - Powder Technology T1 - Prediction of single particle settling velocities through liquid fluidized beds VL - 190 IS - 3 SP - 283 EP - 291 DO - 10.1016/j.powtec.2008.08.005 ER -
@article{ author = "Grbavčić, Željko and Arsenijević, Zorana and Garić Grulović, Radmila", year = "2009", abstract = "Single particle settling velocities through water fluidized beds of mono-sized glass spheres (dp = 0.645, 1.20, 1.94, 2.98 and 5 mm in diameter) were studied experimentally using a column, 40 mm in diameter. The settling spherical particles (Dp = 10 and 19.5 mm) had different densities (1237 to 8320 kg/m3), while the settling particles (Dp = 5 and 2.98 mm) were glass spheres. The pseudo-fluid model, which considers a liquid fluidized bed as a homogenous pseudo-fluid, predicts single particle settling velocities quite well if the ratio Dp/dp is larger than about 10. With decreasing ratio Dp/dp, the overall friction between the settling particle and the fluidized media increases. A method for predicting single particle settling velocities through a liquid fluidized bed is proposed and discussed. Following the approach of Van der Wielen et al. [L.A.M. Van der Wielen, M.H.H Van Dam, K.C.A.M. Van Luyben, On the relative motion of a particle in a swarm of different particles, Chem. Eng. Sci. 51 (2006) 995-1008], the overall friction is decomposed into a particle-fluid and a particle-particle component. The effective buoyancy force is calculated using the transition function proposed by Ruzicka [M.C. Ruzicka, On buoyancy in dispersion, Chem. Eng. Sci. 61 (2006) 2437-2446]. A simple model for predicting the collision force is proposed, as well as a correlation for the collision coefficient. The mean absolute deviation between the experimental and calculated slip velocities was 5.08%.", journal = "Powder Technology", title = "Prediction of single particle settling velocities through liquid fluidized beds", volume = "190", number = "3", pages = "283-291", doi = "10.1016/j.powtec.2008.08.005" }
Grbavčić, Ž., Arsenijević, Z.,& Garić Grulović, R.. (2009). Prediction of single particle settling velocities through liquid fluidized beds. in Powder Technology, 190(3), 283-291. https://doi.org/10.1016/j.powtec.2008.08.005
Grbavčić Ž, Arsenijević Z, Garić Grulović R. Prediction of single particle settling velocities through liquid fluidized beds. in Powder Technology. 2009;190(3):283-291. doi:10.1016/j.powtec.2008.08.005 .
Grbavčić, Željko, Arsenijević, Zorana, Garić Grulović, Radmila, "Prediction of single particle settling velocities through liquid fluidized beds" in Powder Technology, 190, no. 3 (2009):283-291, https://doi.org/10.1016/j.powtec.2008.08.005 . .