Showing papers in "Chemical Engineering Science in 1972"

TL;DR: In this article, a modified Redlich-Kwong equation of state is proposed, which can be extended successfully to multicomponent-VLE calculations for mixtures of nonpolar substances, with the exclusion of carbon dioxide.

TL;DR: In this paper, the surface dilational modulus is obtained from a surface-tension variation, caused by a small-amplitude, sinosoidal-area variation.

TL;DR: In this paper, the heat transfer between a fluid flowing through a packed bed and the wall is interpreted according to a one-dimensional model characterized by an overall heat transfer coefficient, hw and by two-dimensional models with one parameter, the effective thermal conductivity, ke or two parameters, the Effective Thermal Conductivity (ETC) λe and αw.

TL;DR: In this paper, a general structural model is developed for the description of non-catalytic gas-solid reactions; which allows for spherical and flat plate like pellets, made up of spherical or flat plate-like grains.

TL;DR: In this paper, the turbulent Graetz problem is solved numerically for the lower eigenvalues and constants for Reynolds numbers in the range 10 4 Re 6 and for Prandtl numbers in range 0 Pr 4.

TL;DR: In this paper, a general theory is presented for determining the quasistatic Stokes resistance of a particle or an aggregate of particles of arbitrary shape which move with arbitrary translational and rotational velocities in an infinite viscous fluid subjected to a general linear shear flow in the absence of the particles.

TL;DR: In this paper, the growth of an isolated, stationary bubble in an isothermal liquid supersaturated with an atomically or molecularly dissolved gas is treated theoretically, with emphasis on departures from "parabolic" growth produced by: (i) finite rate exsolution kinetics, nonzero surface tension and (iii) nonzero initial bubble size.

TL;DR: In this paper, three pertinent aspects associated with grinding of brittle solids, namely, grinding kinetics, particle-size distributions and energy-size reduction relationships have been unified in the framework of a phenomenological model of particle size reduction.

TL;DR: In this paper, a linear mathematical model of heatless adsorption of a trace component obtained by the method of characteristics was used to investigate the effect of CO 2 in excess He.

TL;DR: The applicability of Kolmogoroff's theory of local isotropic turbulence to problems involving particle-liquid mass transfer in turbulent flow is critically examined in this paper, which leads to the conclusion that the hydrodynamics of mass transfer can be accounted for by a single parameter; the power input per unit mass.

TL;DR: Solutions of the transient diffusion equation for sorption in a system of spherical particles in which the diffusivity of the sorbate varies with concentration are presented in this paper, where a difference between the rates of adsorption and desorption is to be excepted.

TL;DR: In this article, the turbulance field was anisotropic and intermittent, the latter being caused by a highly turbulent and randomly moving jet generated by the impeller blades, which revealed the presence of periodic velocities close to the rotating blades.

TL;DR: In this paper, mass transfer coefficients were measured for the liquid phase for gas absorption into a turbulent liquid flowing down a long wetted-wall column, and the results were interpreted in terms of an eddy diffusivity model and indicate that the eddy diffusion increases as the square of the distance from the interface.

TL;DR: In this paper, a population balance equation for kinetics of granulation in the ball growth region by non-random coalescence mechanism has been proposed and it is shown that the granule-size spectra eventually acquire a self-preserving form and the rate of growth of the median granule dia obeys a power function law.

TL;DR: In this article, the authors compared the uniform and non-uniform distribution of catalyst on porous supports with regard to: (1) the catalyst selectivity in a series reaction A → B → C, (2) the catalytic deactivation under a self-fouling reaction A→ B →C.

TL;DR: In this paper, the drop size distributions produced for the kerosene water system in a 30 cm dia stirred vessel dispersed phase hold-up values of 0·05,0·10 and 0·20 and stirrer speeds of 250, 300, 350 and 400 rpm are examined.

TL;DR: In this article, it was shown that the infinite multiplicity of steady states is reduced to a few solutions if one assumes heat conduction to take place in the catalyst phase, which is not the case in this paper.

TL;DR: In this article, exact solutions of the Stokes flows in and around a spherical fluid particle in the presence of another fluid particle or of a plane surface normal to the settling velocity are obtained using bispherical co-ordinates.

TL;DR: In this article, the authors studied the kinetics of crystal growth of a number of sparingly soluble salts and found that the rate of growth of barium sulphate showed a third order dependence on concentration when the crystals were small.

TL;DR: In this article, the energy and adsorbate conservation equations for continuous changes of state are transformed to characteristic form, and recognized to be two kinematic wave equations, each describing the propagation of a small change in a combined potential depending on temperature and adorbate concentration.

TL;DR: In this paper, a study of the inception and growth of waves on falling liquid films is reported, and the results obtained include measurements of the wave growth rates and the variations of the maximum wave height, mean film thickness, and residual film thickness in the area of wave inception.

TL;DR: Box's Complex method, is used to solve an actual example amenable to the integrated approach, and it is shown that one of the alternative streams can be eliminated to give the optimal synthesis.

TL;DR: In this paper, a cellular structure was proposed, consistent with the observed lack of solids mobility in the expanded beds, and a photographic study made to find out their average size, size distribution, shape and orientation.

TL;DR: In this article, a nickel-aluminum alloy wire of 0·0315 cm in diameter was used as the heating element for pool boiling data for 7 concentrations of isopropanol in water and 9 concentrations of acetone in water, as well as for 3 pure components.

TL;DR: In this article, the influence of enforced periodic concentration variations on a continuous stirred tank reactor was studied theoretically, and it was shown that the unsteady-state processing becomes advantageous under certain conditions.

TL;DR: In this article, the authors used psychrometric charts to predict the behavior of a silica-gel air-drier operating under equilibrium conditions, and compared these charts with published measurements taken from a real system.

TL;DR: In this paper, a general dynamical theory of dilute suspensions of rigid particles of arbitrary shape dispersed in a Newtonian fluid, including rotary Brownian motion and external couples acting upon the suspended particles, is presented.

TL;DR: In this article, the steady-state, continuous couter current contacting of SO 2 -bearing air with water in a column packed with carbon was modeled by combining the classical treatment for gas absorption with expressions for the rate of transport through the liquid and for the catalytic oxidation within the porous carbon.

TL;DR: In this paper, pressure drop and void fraction measurement were carried out for the two-phase cocurrent flow of gas and liquid in a helical coil of 12.5 mm i.d.

TL;DR: The absorption of oxygen from air into tap water in a pulsed bubble column has been investigated in this article, where the column consisted of two 3 in. dia. vertical tubes 9 ft. 10 in. high connected at the base and pulsed by compressed air at frequencies of 1·09-1·35 Hz and amplitudes up to 3·7 in.