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Showing papers in "Chemical Engineering Science in 1970"


Journal ArticleDOI
TL;DR: In this paper, an alternative representation is proposed by describing the progress of the reaction in terms of the porosity, grain size, gas phase and solid state diffusivities and a heterogeneous reaction rate constant, which is now independent of structure.

428 citations


Journal ArticleDOI
TL;DR: In this article, the authors measured the longitudinal dispersion coefficient in batch type bubble columns of 40, 80 and 160 mm diameter with perforated plates and established models to interpret the behaviour of the coefficient.

178 citations


Journal ArticleDOI
TL;DR: In this paper, a constant volume technique is described for measuring the instantaneous rates of solution of rising gas bubbles in liquids; this simultaneously determines the bubble shape, area and rising velocity at the instant of measurement.

149 citations


Journal ArticleDOI
TL;DR: In this article, two intrinsic criteria for runaway in fixed bed tubular reactors based on the occurrence of characteristic points in the temperature profile along the reactor were introduced, and their transposition in the partial pressure-temperature phase plane allows the derivation of some very simple formulae for the prediction of the critical values for the operating variables.

139 citations


Journal ArticleDOI
TL;DR: In this paper, a non-linear theory was used to calculate the profile of the waves on the surface of the jet at breakup, and also to predict the volume of the main and satellite drops.

125 citations


Journal ArticleDOI
Norman R. Morrow1
TL;DR: In this article, the irreducible wetting phase saturation retained by drained porous solid has been investigated systematically, and it was concluded that the magnitude of irreducerable phase saturations is dominated by heterogeneity of pore structure.

109 citations


Journal ArticleDOI
TL;DR: In this article, a new technique is presented which, for the parameter study of a problem, enables one to transform the boundary value problem to the initial value problem and different criteria for testing of uniqueness and multiplicity respectively are discussed.

103 citations


Journal ArticleDOI

102 citations


Journal ArticleDOI
TL;DR: In this paper, the elasticity modulus of a fluidized bed has been calculated from a drag force-interparticle distance relation, and a satisfactory criterion for the transition between homogeneous and heterogeneous fluidization has been obtained.

100 citations


Journal ArticleDOI
TL;DR: The results of tracer experiments can depend on the methods of injection and measurement of the tracer when the fluid velocity is not uniform through the injection/measurement planes as discussed by the authors.

84 citations


Journal ArticleDOI
TL;DR: The stability of steady shear flows of some viscoelastic fluids relative to small perturbations in the initial data is examined in this article, where it is shown that all values of the steady-shear rate where the flow curve exhibits a zero or negative slope the flow is unstable.

Journal ArticleDOI
TL;DR: The kinetic data of the reaction were calculated from the absorption rate of oxygen into the mechanically agitated sulphite solutions and it was found that the reaction order in oxygen depends on the oxygen concentration in the liquid phase at the interface.

Journal ArticleDOI
TL;DR: Park et al. as mentioned in this paper measured the local bubble properties in a gas-fluidized bed using an electroresistivity probe and analyzed the probe data with a hybrid computer using the techniques applied by Park et. al. to gas fluidized beds.

Journal ArticleDOI
TL;DR: In this article, the salt redistribution process occurring in the freezing of a NaCl solution was examined, and the factors responsible for controlling salt rejection were analyzed, and two parameters were found to control the redistribution process: (1) the liquid phase interface concentration which is controlled by constitutional supercooling, and (2) the thermal driving force imposed on the system to initiate and maintain freezing.

Journal ArticleDOI
TL;DR: In this article, a solution based on the film theory is presented for gas absorption accompanied by a generalized, reversible chemical reaction of the form γAA+γBB⇋γEE+γFF.

Journal ArticleDOI
TL;DR: In this article, the authors analyzed the concentration and temperature profiles arising in adiabatic fixed-bed adsorption of a single gaseous component, with particular reference to the special case of a pure temperature wave preceding the mass transfer zone.

Journal ArticleDOI
TL;DR: In this paper, Gas absorption accompanied by the parallel chemical reactions is discussed from the view-point of the film theory and the approximate solutions for the ratio Φ are derived by the same method described in our previous papers and compared with the analytical or numerical solutions for several cases.

Journal ArticleDOI
TL;DR: In this paper, an analysis of the facilitated transport problem with steady diffusion through a finite membrane, accompanied by rapid and reversible, homogeneous chemical reaction is presented, where matched asymptotic expansions are used to analyze the structure of the diffusion field, which is shown to consist of an equilibrium core, together with boundary-layer reaction zones at the membrane boundaries.

Journal ArticleDOI
TL;DR: In this article, the effects of axial mixing in the industrial adiabatic packed beds are discussed. Butler et al. presented numerical results in graphical form for a range of parameters where multiple solutions may occur.

Journal ArticleDOI
D.E. Smiles1
TL;DR: In this article, two equivalent analyses that describe the one dimensional process of cake filtration are presented, which permit the prediction of density gradients in the solid material at any time, as it accumulates on the filter membrane.


Journal ArticleDOI
TL;DR: In this article, the authors proposed a new theory for withdrawal from viscous Newtonian liquids by vertical plates, and the thickness of the liquid layer on the withdrawn plate was determined experimentally by a light adsorption method.

Journal ArticleDOI
TL;DR: In this paper, it was shown that coupling between diffusion and convection occurs not only in longitudinal dispersion of matter by fluid flow through packed beds, but also in radial dispersion.

Journal ArticleDOI
TL;DR: In this article, the authors measured the extent of gas exchange between the bubble and emulsion phases in gas-solid fluidized beds using ozone as a tracer and found that the exchange coefficient values measured for single bubbles, as seen in this study, were found to be roughly one third of that obtained from freely bubbling fluidized bed, which fact was attributed to the coalescence of bubbles in the freely bubblebed.

Journal ArticleDOI
TL;DR: In this article, mass and enthalpy balances for a homogeneous CSTR with recirculation of both heat and mass have been performed and necessary and sufficient conditions for multiplicity are developed.

Journal ArticleDOI
TL;DR: In this paper, an instrumented copper sphere was provided with a small calorimeter which permitted measurements of the local thermal transfer within a packed bed of spheres of uniform diameter, and a boundary layer model based upon the established behavior of thermal and material transfer from single cylinders and spheres in turbulent fluid streams was discussed.

Journal ArticleDOI
TL;DR: In this paper, it was shown that the fundamental stoichiometric constraints on a set of chemical reactions carry over to the dynamics of open systems in the analysis of asymptomatic stability.

Journal ArticleDOI
TL;DR: In this paper, the authors presented four convenient methods for determination of the mean residence time and axial dispersion coefficient of a flow system by analysis of data obtained by means of the imperfect tracer pulse method.

Journal ArticleDOI
TL;DR: In this paper, special experimental techniques have been developed to measure the thermal conductivity of porous lime and the diffusion coefficient of carbon dioxide through it, and measurements have been made on lime whose porosity varied in the range 0·45

Journal ArticleDOI
TL;DR: For a pulse input, the shape of the output tracer curve depends on the way tracer is distributed across the flowing fluid, and the way it is measured as discussed by the authors, and it is shown which one of these represents directly the residence time distribution of the fluid.