Showing papers in "Chemical Engineering Science in 1961"

TL;DR: In this paper, bipolar co-ordinates are employed to obtain exact solutions of the equations of slow viscous flow for the steady motion of a solid sphere towards or away from a plane surface of infinite extent.

TL;DR: In this paper, the authors measured the interfacial area in gas-liquid dispersions and correlated the data with other published data for heat and mass transfer in liquid-liquid and solid-gas dispersions in which the dispersed phases are free to move under the action of gravity.

TL;DR: In this article, the authors compared the results of their own investigations on the flow of granular solids (a number of seeds) with results published by others, and showed that the results were similar to those of others.

TL;DR: In this paper, a series of correlations are developed for the pressure drop and the separating power of hydrocyclones and rules for establishing the optimum design of the cyclone are derived, and a pressure drop correlation is derived as the product of two independent functions, one describing the dependence on the Reynolds number based on inlet conditions, and the other describing the shape of cyclone.

TL;DR: In this article, the influence of catalyst fouling on the conversion to the product of interest has been studied by coupling a rate equation for the formation of the catalyst fouler compound to the continuity equation of the main product, and it is shown that in the case of a descending profile of carbonaceous material the rate and temperature profiles exhibit peak values whose loci travel through the reactor as time increases.

TL;DR: In this paper, a two-phase model of a gas-solid fluidized bed is applied to steady-state and transient gas mixing tests, where a dense phase consisting of particle aggregates and a dispersed phase of high vertical gas velocity are exchanged continuously between the two phases.

TL;DR: In this paper, a theoretical study of multicomponent isotope separation cascades is presented, which leads to the multicomponent analogue of the two component ideal cascade, a matched abundance ratio cascade.

TL;DR: In this article, the Stokes stream function for flow past a single sphere is used in order to obtain an equation relating the settling velocity of a suspension of monosize spherical particles to the volume concentration of the solid phase.

TL;DR: In this article, the distribution of residence times of solid particles is examined in fluidized beds at steady state with continuous feed and discharge of solids, both for beds consisting of a single particle size and for beds with a wide spectrum of particle sizes, and the mean age of particles of a given size is the same in both overflow and carryover streams.

TL;DR: In this article, it is suggested that the adsorbed inhibitors increase the surface concentration of carbonate ions and thereby increase the rate of the reverse reaction, and a kinetic equation developed on this basis agreed reasonably well with the observations.

TL;DR: In this paper, an optical method has been developed for measurement of concentration fluctuations at a point within systems undergoing turbulent mixing, where intensity, two-point correlation and spectral density of mean-square concentration fluctuation have been measured in a jet of smoky air discharged into ambient air.

TL;DR: In this article, a non-isochronal diffusion equation is proposed to determine the drying rate of wheat in spouted beds. But the diffusion coefficient is independent of the amount of moisture in the spouted bed.

TL;DR: In this article, an integral method was used to find solutions for zero wall velocity and for a mass-transfer velocity at the wall, with the wall either insulated or held at a constant temperature.

TL;DR: In this article, the relationship between the variables involved in the spouting of coarse particles are considered, and the dependent variables are divided into four categories: those dependent only on the gas and particle properties, those dependent also on the column geometry, those additionally dependent on the bed depth, and those moreover dependent on position within the bed.

TL;DR: Several surface renewal models are developed to describe mass transfer between phases as mentioned in this paper, and the first of these predicts a maximum in mass transfer rate with respect to system agitation, and two other models are based respectively on assumptions of a transient, non-equilibrium interface, and a thin interfacial layer of reduced effective diffusivity.

TL;DR: In this paper, a laminar liquid jet absorber was first used, and the results obtained (which covered the contact time range between 0·02 and 0·07 sec), showed good agreement with the penetration theory equations as well as with the kinetics of the mechanism of the chemical reaction which presumably takes place in the liquid phase.

TL;DR: In this paper, the process of thermal decomposition of calcium carbonate has been treated as one governed by simultaneous heat and mass transfer, under quasi steady state conditions, to the decomposition interface.

TL;DR: In this article, a reologischen Messungen ihre ursprungliche Struktur beibehielten, konnten die Fliesskurven dargestellt werden.

TL;DR: In this article, the authors measured heat transfer coefficients in a pool boiler for fourteen binary mixtures, including ideal solutions and systems with strong positive and negative deviations from Raoult's law.

TL;DR: In this article, the authors measured the drag coefficient of a sphere moving through five aqueous solutions of carboxymethylcellulose (CMC) and found that the behavior of these fluids could be approximated by the Ellis model and two dimensionless correlations for the drag coefficients in terms of a modified Reynolds number and two other dimensionless groups were prepared.

TL;DR: The fourth part of a series of papers on hydrocyclones is presented in this article, in which the size of the particles to be separated is known and constructional details and items to be observed in designing a cyclone or cyclone battery are discussed.

TL;DR: In this article, the heat transfer characteristics of a laminar wall jet with constant physical properties are treated in some detail, and exact solutions are found when the flow is self-preserving in shape, and the wall temperature is variable and of the form Σ Anxn.

TL;DR: In this article, a pressure drop equation for ideally fluidized beds consisting of spheres of uniform size is presented, which differs from the Ergun equation inasmuch as it includes a tortuosity factor, q, a cross-section factor, z, both of which are void fraction dependent, and an inertial drag coefficient, c i, dependent only on particle Reynolds number.

TL;DR: In this paper, the problem of intraparticle diffusion and conduction is considered for complex reactions taking place in porous catalytic spheres, where it is assumed that Knudsen diffusion prevails and that heat generated in the reaction is conducted through the porous structure to the catalyst surface.

TL;DR: In this article, the flow equations of a general non-elastic fluid are solved for the case of steady, incompressible, laminar flow between parallel boundaries in linear movement, and with an arbitrary pressure gradient.

TL;DR: In this paper, a simple model of particles which keep their diameters almost constant during reaction with the gas flowing in the fluidized bed, and applying the exit age distribution functions obtained in Part I, equations for the conversion of product particles were derived.

TL;DR: In this paper, the results obtained when using baffled beds show that the baffles improve the conversion from 10 per cent to 40 per cent over that obtained in non-baffled fluidized reactors.

TL;DR: In this paper, the axiale mischkoeffizient is considered as a charakteristische Grosse zur Kennzeichnung der Verweilzeitverhaltnisse.

TL;DR: In this paper, the dynamics of the absorption of nitrous gases into water is explained as the result of a number of separate reaction mechanisms, and the relative importance of these mechanisms is primarily dependent on the gas composition.

TL;DR: In this paper, a discussion of a pilot plant study of the oxidation reactor, being the first part of an installation producing cyclohexanone from cyclomethane, is given.