Residence Time Distribution of Particles during Two‐Phase Non‐Newtonian Flow in Conventional as compared with Helical Holding Tubes
Tóm tắt
The residence times of multiple particles during the flow of a non‐Newtonian suspension through a conventional holding tube assembly were compared with that in a helical holding tube assembly of identical length and tube diameter. The residence times were measured for different combinations of process parameters (viscosity, flow rate of fluid, size and concentration of particles). The effects of these parameters on Residence Time Distribution (RTD) of particles was determined and dimensionless equations were developed to predict the mean, minimum and standard deviation of residence times. The RTDs in the helical holding tube were found to be narrower than in the conventional holding tube. The RTD of particles at all combinations of process parameters were normally distributed. The ratio of mean to minimum residence time was within 1.05 to 1.11 in the helical holding tube and 1.06 to 1.16 in the conventional holding tube for the range of parameters studied.
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Tài liệu tham khảo
Ahmad M., 1993, Distribution of solid particles in multisized particulate slurry flow through a 90° pipe bend in horizontal plane, Bulk Solids Handling., 13, 379
Bateson R.N., 1969, The effect of age distribution on aseptic processing, Chemical Engineering Progress Symposium Series no. 168. vol., 67, 44
Carlson V.R.1991.Enhancement of heat transfer in heat exchangers for aseptic processing. ASAE Paper no. 916608.
Cuming A.G.1952.Aeronautical Research Council London Reports and Memoranda no. 2880. Feb. 1952.
Nesaratnam R.N., 1987, Application of a particle technique to the study of particle sterilization under dynamic flow
Sandeep K.P.andZuritz C.A.1994b.Modeling the flow of non‐Newtonian suspensions in straight and helical holding tubes.ASAE Paper No. 946575.
SAS Institute, Inc., SAS procedures guide, 617
Whorlow R.W., 1979, Rheological Techniques, 115