Showing papers in "Chemical Engineering Science in 1962"

TL;DR: In this paper, a theory for predicting diffusion rates at constant pressure through bi-disperse porous media is proposed, where the total rate is the sum of separate contributions for diffusion through macropores, micropores and a series path.

TL;DR: In this paper, a general graphical correlation involving Fr = u2/gd, Eo = ρgd2/σ and Y = gμ4/ρσ3 is given.

TL;DR: In this article, a theory is presented which shows that the velocity of the bubbles consists of a component equal to the superficial liquid velocity, a component equivalent to the gas velocity and a component due to buoyancy.

TL;DR: In this paper, a study of the stability and disintegration of flat sheets produced by single-hole spray nozzles at various densities of the surrounding air has been made, and it is shown that a flat laminar sheet injected in vacuo is stable, and that drops are formed only at its edges.

TL;DR: In this article, the relationship between these models and generalization of all the previously presented measurement techniques is discussed, which gives a comprehensive picture of the field of dispersion, allows a quantitative evaluation of the error incurred when a simple model is used in place of a more exact but more unwieldy model, and gives future experimenters the necessary information to decide what combination of experimental set-up and mathematical model yields, within prescribed limits of error, an analysis of desired accuracy.

TL;DR: In this paper, the terminal velocity at small Reynolds numbers has been related to the cap size and then to the type and amount of surfactant used, which agreed well with the theory except in two instances.

TL;DR: A new model for mass transfer from a turbulent fluid to an interface is presented in this article, where eddies arriving at random times come to within random distances from the surface, sweeping away the accumulated solute Transfer is by molecular diffusion in the interval between eddies.

TL;DR: The classical theory of fluidization does not take into account the possibility of the occurrence, in fluidized beds, of electrical forces conditioned by static electricity as discussed by the authors, and the electric charges which accumulate on solid particles may cause the adhesion of a layer of solid particles to the walls of the fluidizing equipment.

TL;DR: In this article, the transient rates of absorption of CO2 into NaOH, Na2CO3/NaHCO3 and Na2SO4 solutions have been measured for times up to one second.

TL;DR: In this paper, the absorption rate of carbon dioxide from single rising bubbles of equivalent diameter 0·8-4·2 cm in water has been measured and compared with a theoretical equation for absorption at the upper surface of a spherical cap bubble.

TL;DR: In this article, the authors considered the problem of finding dispersion coefficients for each of the two important classes of dispersion models and treated the models as if they were completely separate, but in some cases certain conditions must be satisfied for the relationships between models to hold.

TL;DR: In this paper, the influence of a profile in the carbon content of the catalyst on the rate coefficient derived from experiments in integral piston flow reactors has been discussed and a relatively simple reaction scheme that leads to important variations in the selectivity is solved as an example.

TL;DR: In this paper, a theory, developed earlier by the authors, which describes charge generation in the turbulent flow of low-conductivity (hydrocarbon) liquids in tubes, is recapitulated.

TL;DR: In this paper, an experimental work dealing with the laminar flow of relatively non-viscous Newtonian liquids through a horizontal jacketed tube is described and the extent of the heat transfer by natural convection differs from that previously predicted.

TL;DR: In this paper, a new mathematical model was developed for the stirred tank reactor, which assumes a circulating flow, created by the pumping action of the stirrer, and an isotropic homogeneous turbulence in the circulated fluid.

TL;DR: In this article, a theoretical equation for the rate of liquid phase-controlled gas absorption by an annular jet was derived and confirmed by measurements of the absorption rate of CO2 in annular jets of water.

TL;DR: In this paper, temperature profiles were measured for fully developed turbulent flow of air in a pipe using small wall-heat fluxes, and measurements over the central 85 per cent of the pipe cross-section can be represented by the following equation which was derived assuming a constant eddy diffusivity for heat.

TL;DR: In this paper, the mass transfer associated with the regeneration of a single porous catalyst is described and the local carbon burning rate is taken to first order with respect to local partial pressure oxygen.

TL;DR: In this article, the reaction model for the reduction of NiO pellets by hydrogen has been postulated to consist of two simultaneous reactions, first a reaction between NiO and hydrogen gas adsorbed on NiO, and second, a reaction at the boundary between the two solid phases NiO/Ni with hydrogen adsorbbed on nickel.

TL;DR: In this paper, pressure-drop data obtained in the pneumatic transport of fine cracking catalyst in vertical risers of 2-in. diameter and of several lengths, with air and steam as transport gases at various temperatures and pressures.

TL;DR: In this article, it was shown that surface active agents at Reynolds numbers corresponding to wavy flow suppressed both the waves and the velocity fluctuations, and that the rate of acceleration of the liquid film to the steady state conditions was determined mainly by surface tension.

TL;DR: In this article, a plot of all the data over at least five orders of magnitude of the dimensionless group fell well within experimental scatter of the theoretically drawn curve for smooth tubes.

TL;DR: In this article, a suitable index of mixing has been obtained from the variance of a number of small samples to which a correction has to be applied for the random variance owing to the small sample size.

TL;DR: In this article, the approximate boundary-layer treatment originally due to Pohlhausen has been extended both for two-dimensional and for axially symmetric bodies to fluids whose behaviours may be described by the Ostwald-de Waele model.

TL;DR: In this paper, the rate of collapse of small bubbles has been used to measure the diffusion coefficients (in water) of air, oxygen, nitrogen, hydrogen, helium, neon and argon.

TL;DR: In this article, a method of analysis is presented to obtain the asymptotic form of the conservation equations used to describe non-isothermal chemical reaction in porous catalysts.

TL;DR: In this paper, an approximate and simplified equation for the jet profile has been derived, but its validity is limited to long jets with high velocities, and the results compare well with theoretical predictions, provided the orifice is clean.

TL;DR: In this paper, an elementary analysis for isothermal selectivity in the first-order reaction sequence A → B → C as catalysed by porous pellets consisting of micropores branched from macropores is provided.

TL;DR: Theoretical equations which predict the temperature as a function of time and position in a catalytic bed during regeneration are presented for the case of adiabatic operation and the case where heat is lost to an isothermal coolant as mentioned in this paper.

TL;DR: An interferometric technique based on the Gouy method for determining the diffusion coefficients of mono-, di- and triethanolamines in aqueous solutions is described in this article. But the results differ from those based on semi-empirical equations.