Slurry line limit deposit velocity

To start the slurry line limit deposit velocity calculatioit, an initial line size (inside diameier) has to be selected. Ihen, use following method to estimate the limit deposit velocity. 

Method 1 Jh 1987, J. T. Davis [9] published an equation based on theoretical reasoning to estimate slurry line (with One solid particle size) limit deposit velocity (V LD In fl/sec) as follows  

For slurry has many different sizes solid particles, its avemge solid panicle diameter can be calculated by following equation  

Rep is solid particle Reynolds number vp is solid particles settling velocity in quiescent liquid, in m/sec C is drag coefEicicnt Ar is Archimedes number. 

Method 2 In 1980, A. R. Oroskar and R. M. Turtan [10] based on theoretical reasoning (fraction of turbulent eddies to keep solid particles suspended) and regression analysis of 357 experimental data. These data cover solid particle diameter from 0.1 to 2.04 mm, line diameter from 1.9 to 31.5 cm, solid particle specific gravity from 1.3 to 5.25, solid volume fraction from 0.01 to 0.50, fluid specific gravity from 0.9 to 1.35, and fluid viscosity from 0.47 to 1300 cp. See reference 10 Table 2 for more details. Oroskar and Turian reported their equation can predict experimental data within 21.8% error. 

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P, Doron and D. Bamea [7], developed a set of equations to estimated the limit deposi t velociQr and slurry line pressure drop at any line velocity. Their equations are compticated (integral and differential fbnns) and needs to be soJved numerically- 1995, P. Doron and D, Bamea [ft] compared their theoretical model with experimental data. They found better estimation in limit deposit velocity and slurry line pressure drop estimation. The advantage of their model is able to estimate the slurry line operation at flow below or above limit deposit velocity, the height of stationary bed, and their estimations (V LD and DP) are very dose to expcHmental data, but it is difficult to use their model. Therefore, an easier way to estimation sluny line limit deposit velocity and line pressure drop is presented below,... 

Once sluny limit deposit velocity is found, it iarecomntenided to select slurry line design velocity by adding 1 to 2 Wssc to the estimated limit deposit velocity or by times it by 1.23, whichever is greater. One caution is that for hard solid particles, too high slurry velocity will cause line erosion. Therefore, for sluny handling hard solid particles, a moderate safety margin should be added to the limit deposit velocity. 

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