Showing papers in "Chemical Engineering Science in 1975"

TL;DR: In this paper, a general form of the equations for multi-phase transport is derived and applied to the particular case of mass transport, with particular attention paid to the proper allocation of the transport mechanisms between convection and diffusion.

TL;DR: A review of previous calculations of particle collision rates in a turbulent fluid shows that they are suitable only for low intensity turbulence, such as that found in water treatment plants as discussed by the authors, and the assumption of independent particle velocities as in the gas kinetic theory is appropriate for the high intensity turbulence generated in suspensions being pumped and mixed under normal industrial conditions.

TL;DR: In this article, the authors proposed an orthogonal collocation method for heat and mass transfer with chemical reaction in a catalyst pellet, which is especially suited to situations corresponding to high Thiele modulus when the solution is confined to a thin boundary region near the catalyst surface.

TL;DR: In this article, the problem of deposition of particles from a turbulent gas stream is examined and the prediction for deposition, in both inertial and diffusional-controlled situations, are compared with available experimental data and show satisfactory agreement.

TL;DR: In this paper, the dissolution of calcite in hydrochloric acid was studied with the aid of a rotating disk system at 800 psig in the temperature range −15·6-25°C.

TL;DR: In this paper, an analysis of the vortex field in terms of a solution to the simplified Navier-Stokes equations shows reasonable agreement with the measured velocity profiles, and pressure field determinations at two different scales prove that Reynolds number alone is a sufficient scale-up parameter.

TL;DR: In this paper, the authors determined the mass transfer coefficient for external and internal transport using experimentally established time-concentration curves in batch tests for the adsorption of organic impurities from water on activated carbon particles.

TL;DR: In this paper, a new model is proposed for predicting anomalously low heat and mass transfer coefficients that have been derived from experiments in packed and fluidized beds of fine particles or fine wire packs at low Reynolds number.

TL;DR: In this paper, a special device to send a plane impulse of tracer liquor was developed, and a correlation has been given for a wide range of flow and dispersion in packed beds.

TL;DR: In this article, a modified version of the original Jenike theory is presented, with simplified, purely analytical expressions for the distribution of active and passive stresses in the powder in the converging hopper section of a silo.

TL;DR: In this paper, heat and mass gas-to-solid coefficients associated with the vaporization of water and some hydrocarbons from the surface of a monolithic structure were experimentally established.

TL;DR: In this paper, a one parameter model is proposed to represent the reaction of an initially nonporous solid with gas, where cracks form at the pellet surface and penetrate into the interior.

TL;DR: In this paper, the relations proposed by Ash and Barrer on the basis of the thermodynamics of irreversible processes for the description of surface flow are transferred to the adsorption kinetics of binary gas mixtures.

TL;DR: In this article, a procedure involving high speed cine photography and novel optical probes has been used to study droplet interaction phenomena in liquid-liquid dispersions and the rate of coalescence was measured at various positions in a stirred tank for dispersions of methylisobutylketone.

TL;DR: In this article, the heat and mass transfer in a monolithic honeycomb catalyst is described. But the authors focus on the control of automobile emissions and exhaust gases from some industrial processes.

TL;DR: In this paper, an improved probe technique for the measurement of bubble size and velocity in turbulent bubble dispersion has been developed, which makes use of fast real-time data processing methods to identify the bubble orientation during measurement and to accept readily interpretable data for only those bubbles whose central axes are coincident with the probe axis.

TL;DR: In this paper, the effect of some liquid physical properties on gas holdup was investigated in a glass column of 15·9 cm dia and 390 cm high, where the steady-state tracer injection technique and the axial-dispersed-plug-flow model were used.

TL;DR: In this paper, it is proposed that Stewart's model, which contains a single unknown parameter k (the mean liquid-wake/bubble volume ratio in the bed), should be used in conjunction with Wallis' drift flux approach.

TL;DR: In this paper, the onset and growth of the spinning instability is analyzed for an isothermal Newtonian liquid by examining the nonlinear dynamics of the most unstable spatial mode, which is characterized by large amplitude fluctuations in the takeup area and the force.

TL;DR: The results of an experimental study of dispersion of solute in helical coils under laminar flow conditions are reported in this paper, where it is shown that coiling can reduce axial dispersion by a factor of upto 500.

TL;DR: In this paper, the effect of axial and radial thermal dispersion and wall thermal resistance upon heat transfer to fixed beds of solids is analyzed by applying non-linear regression.

TL;DR: This paper uses primal and dual bounds in a branch and bound strategy to develop a procedure for locating a small number of nearly optimal separation sequences; furthermore, the optimal sequence must be among those found.

TL;DR: In this article, the dissolution of a potassium and a sodium feldspar in hydrochloric-hydrofluoric acid mixtures was studied in a rotating disk system at 25 and 100°C under a pressure of 40 psig.

TL;DR: In this paper, a nonadiabatic, well-stirred, continuous-flow reactor was used to study the stability of unstable states by means of conventional feedback control, and the construction of phaseplane diagrams showing experimental limit cycles and other time-dependent behavior.

TL;DR: Based on the adsorption-rate equation derived in Part I of this investigation, a differential equation has been obtained for the prediction of the concentration distribution in activated carbon columns in this article.

TL;DR: In this paper, a distributed model for a first order irreversible reaction between a porous solid and a gas in which allowance is made for a grain size distribution in the reactant solid matrix is proposed.

TL;DR: In this paper, a general equation for predicting the minimum fluidisation velocity of a mixture of particles of various sizes but all of the same shape and density is proposed, based on the change in voidage that occurs on changing the mixture composition.

TL;DR: In this paper, the authors extended the free volume model of gas permeation to the transport of gas mixtures through nonporous polymeric membranes and showed that the effect of these components on free volume is additive.

TL;DR: In this article, the peak broadening is due to axial dispersion alone and when either the macro-or micropore resistance becomes significant, the peak assumes a skewed shape.