Interstitial velocity of carrier gas

Interstitial velocity of carrier gas. u. The linear velocity of the carrier gas inside a packed column calculated as the average over the entire cross section. Under idealized conditions it can be calculated as ... 

Mean Interstitial Velocity of Carrier Gas u. The interstitial velocity of the carrier gas multiplied by the pressure-gradient correction factor ... 

There are four unknown parameters in the theoretical impulse response for porous particles, h(t) the pellet diffusion time, tdif (which contains the effective diffusion coefficient of the pair T-C, Dtc, td.fs R p/D.f( , R is the radius of the pellet equivalent sphere), the mean residence time of the carrier-gas in the interparticle space, tc (tc = v/L with the carrier gas linear interstitial velocity, v, and column length, L), Peclet number, Pe (Pe = L.v/E, with E the effective axial dispersion coefficient) and the adsorption parameter, 5q (see below). Because matching with four unknown parameters would give highly correlated parameters, it is better to determine some parameters independently,... 

Mass transfer from a surface to the gas-solid suspension is significantly higher than that for particle-free conditions. This increase is due to a possible reduction of the mass transfer boundary layer and an increase in the interstitial gas velocity when particles are present. The effect on heat transfer is even more significant as solid particles also act as heat carriers. 

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