Fluid superficial

Many factors affect gas holdup in three-phase fluidized systems, including bead size and density, liquid physical properties, temperature, sparger type, and fluid superficial velocities (Bly and Worden, 1990). System parameters such as reactor and gas distributor design can have... 

G = fluid superficial mass velocity based on empty methanator cross-sectional area, lb/(sXft2)... 

PDab Pi = fluid density p, = fluid viscosity Vs = fluid superficial velocity dp = particle diameter k = mass transfer coefficient Dab = diffusion coefficient of sorbate in fluid. 

In shortcut methods the reactor volume may be approximated from information about the residence time, expressed either as LHSV, GHSV or WHSV (see section 8.3.1). Technological constraints, as allowable pressure drop, heat and mass transfer, catalyst attrition, etc., are other elements that lead to the final geometric characteristics. An important design parameter is the fluid superficial velocity (phase volumetric flow divided by cross-area). Recommended values are ... 

D30. We have a 500 cm long column packed with a strong acid resin (crx = 2.2 eq/L, = 0.42). Fluid superficial velocity is 25.0 cm/min. Counter-ions are not excluded. Co-ions are excluded. 

A more interesting way to plot the calculations is in the form of certain dimensionless groups which have been discussed extensively in the literature on hydrodynamic dispersion (Fried and Cambarnous, 1971) the groups in question are D/UL and the group UL/Dq where U is the fluid superficial velocity, L is the macroscopic length of the medium, D is the calculated... 

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