tailieunhanh - Intro to Practical Fluid Flow Episode 10

Tham khảo tài liệu 'intro to practical fluid flow episode 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Sedimentation and thickening 171 10-1 10-2 . -3 E 10 3 E I 10-4 CT 10 5 10-6 Gypsum slurry. in batch test Gypsum slurry. in batch test Gypsum slurry. in batch test Gypsum slurry. in batch test Extended Wilhelm-Naide equation TiO2 slurry. in batch test TiO2 slurry. in batch test TiO2 slurry. in batch test Extended Wilhelm-Naide equation 2 3 4 5 6 7 8 9 102 Slurry concentration volume Figure Measured settling velocities for unflocculated slurries. The lines are calculated using the Extended Wilhelm-Naide equation. Data is from Ma 1987 . Equation describes the settling behavior of these flocculated slurries well and for these data is significantly better than the Richardson-Zaki model. This model is also useful for unflocculated slurries and a comparison is shown in Figure using batch settling data from Ma 1987 which is also presented in Turian etal. 1997 . The original data were analyzed using the Kynch graphical construction and are shown as settling velocity as a function of the solids concentration. In spite of the inevitable scatter in the data that is associated with the batch settling test method and the subsequent graphical construction the extended Wilhelm-Naide equation provides an appropriate representation of the data. The T1O2 slurry was made from particles having dso jUm dỹQ Um and dio am. The gypsum suspension was made from coarser particles having dso jUm dỹQ am and dio jUm. The parameters in the extended Wilhelm-Naide equation for these suspensions are given by 1 855 X 1OV0 and 1 X 105 p6 73 X 108 p24 2 for the gypsum and T1O2 respectively. The concentration is expressed as volume fraction in both cases. 172 Introduction to Practical Fluid Flow In spite of its completely empirical nature the extended Wilhelm-Naide equation provides a versatile and flexible description of the settling velocity. It is used in the FLUIDS toolbox and has proved .

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