In general, these Peclet numbers are positive and less than one. For binary systems frequently encountered such as KCl, NaCl, and HCl,Fig. 1.15shows that their mobilities are essentially the same over the entire range ofκaexamined for highly charged particles withϕr= 3 or 5. This indicat...
The diffusion deposition of monodisperse submicrometer aerosol particles in model and real fibrous filters was measured for the Peclet number range 0.110. The model consisted of a grid of parallel cylinders and a fan filter. The real filters consisted of ultrathin fibers with diameter of 0.16 m. ...
Mass transfer coefficients from packed beds of benzoic acid spheres to water and propylene glycol solutions were measured in the very low Reynolds number, N Re′, range of 0.0016 to 55. Studies using bed heights from 1/4 to 4 inches showed the mass transfer, J, to be affected only slightl...
(as it is valid in the range of high Peclet numbers), the apparent overall transfer coefficients for the nonuniform system become much lower, and show the same characteristic variation with Peclet number and the ratio of particle diameter to bed height as the majority of the experimental data....
The experimental work was carried out in a packed bed of combustible materials for the flow rates of 15 脳 10 6 to 50 脳 10 6 m 3/s and a temperature range of 30 to 60掳C. Using the results of experimental work along with numerical modeling and applying a power law formulation, the...
a = x temp = [] while x!=0: temp.append(x%10) x = int(x/10) for i in range(len(temp)): x = x*10+temp[i] return True if a==x else False 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16....
the authors demonstrated that considerable vertical velocities occur outside the instantaneous plume envelope. Velocities beyond the plume edge cannot be induced by viscous effects and must be a result of long-range pressure gradients. The authors observed that the vertical transport outside the plume...
From the experiments we conclude that, in the investigated range, the uncertainty in the interface position is almost well accomplished by the closed form solution, but also that, for finite Peclet values, the pore-scale diffusion may give effects comparable with those due to the spatially ...
In the range of Pe where the macrodispersion mechanism dominated, increasing the Hurst exponent caused the increase of alpha(L) and the secondary roughness played a significant role in enhancing the alpha(L). As the Taylor dispersion mechanism dominated, the alpha(L) was insensitive...
3D models with varying dispersion formulations should be explored in future developments to capture the full range of effects at high viscosity ratio and Peclet number.Keable, DanielDepartment of Earth Science & Engineering, Imperial College London, London, UKJones, Alistair...