Showing papers in "Chemical Engineering Science in 1966"

TL;DR: In this paper, the heat transfer from a hot metal wall to impinging mist droplets has been studied with a non-stationary method, based on differentiation of the cooling curve of a thin metal disc, that was heated to a high temperature, and then cooled by a mist of steam and water droplets flowing perpendicular to it.

TL;DR: In this article, a simple theory is developed which yields the approximate stresses within a granular material or powder flowing in hopper systems and gives the critical factors which ensure continued gravity flow.

TL;DR: In this paper, two general equations are proposed for prediction of the flow rate and maximum velocity versus pressure drop relationship in the isotherma,l steady, uniform, laminar flow of incompressible, time-independent non-Newtonian fluids in ducts of arbitrary cross section.

TL;DR: In this paper, the authors measured diffusion coefficients for dissolved hydrogen, oxygen, nitrogen, air, helium, argon, methane, ethane proprane and n-butane in water at 10°, 20°, 30°, 40°, 50° and 60°C by following the rate of collapse of small bubbles in gas-free water.

TL;DR: In this article, the terminal settling motion of two identical, homogeneous, unconstrained spheres in an unbounded fluid at small Reynolds numbers was determined by computing the linear and angular velocities of the spheres as a function of their relative separation and of the orientation of their line of center relative to the direction of gravity.

TL;DR: The continuity equation and the equations of motion for flow in anisotropic porous media were developed in this paper, and the conditions under which Darcy's law holds were clearly established.

TL;DR: In this paper, a simple model for the creeping motion of a bubble contaminated with an "insoluble" surface active agent is proposed, which is consistent with experimental observations and explains the success of the empirical correlation relating the bubble drag to the Bond number.

TL;DR: In this paper, the desirability of steady state operation is normally assumed both for the design and control of chemical processes, however, it appears that in many cases this assumption is not correct, and two simple problems concerned with chemical reactors are presented which demonstrate that the process performance is sometimes improved by unsteady state operation.

TL;DR: In this paper, the problem of momentum and heat transfer by free convection from a semi-infinite vertical plate to a liquid at its maximum density is analyzed and it is shown that the magnitude of the convective velocities may be much reduced when operating at this density.

TL;DR: In this paper, the authors investigated the heat transfer from a hot metal surface to a water drop resting upon it, and the experimentally determined evaporation rate in a saturated atmosphere agreed rather well with the predictions of a simple theory, in which the bottom of the drop was assumed to be flat.

TL;DR: In this article, the authors considered two aspects of the behaviour of a bubbling fluidized bed, namely, how the rising velocity of a bubble in a cloud of bubbles related to the velocity of the same bubble in complete isolation, and how the total flow of fluidising fluid to the bed divided between the bubble and particulate phases.

TL;DR: In this article, the authors analyzed the combined forced and free convection heat transfer in laminar boundary layer flows, in which the momentum equation is coupled with the energy equation on account of the presence of the gravitational term.

TL;DR: In this paper, a transition from laminar to turbulent flow in a dumped bed of spheres was detected by measuring the local rates of mass transfer around the circumference of one of the packings, and the change from a steady to an unsteady mass transfer rate occurred over the whole surface of the test sphere at approximately the same Reynolds number.

TL;DR: In this paper, a quantitative theory is presented which describes the mixing of two identical powders in a horizontal barrel mixer, and it is proposed that when two components are loaded end-to-end in a simple barrel mixers, mixing can occur only by diffusion.

TL;DR: In this paper, the authors derived the differential equations governing the dissolution or growth of a sphere of finite initial radius controlled by mass diffusion for the case where the density of the solution is a linear function of solvent concentration.

TL;DR: In this article, the homogeneous reaction rate of oxygen and sodium sulfite in aqueous solution was investigated by the rapid-mixing method of HARTRIDGE and ROUGHTON.

TL;DR: In this article, the structure of random beds packed with spheres or irregular shaped particles is characterized theoretically and experimentally by means of statistical methods, and a relation for the mean hydraulic radius is derived for a random bed of spheres.

TL;DR: The gas velocities for flooding in a wetted wall column have been measured as a function of liquid viscosity and flow rate as mentioned in this paper, and they were found to be somewhat higher than those predicted by D avidson and S hearer.

TL;DR: In this article, the authors derived analytical solutions giving the concentration profiles and separation factors for differential stagewise counter current extraction with backmixing when there is a linear equilibrium relationship, and reduced these general solutions to those for simpler cases.

TL;DR: The variation of local voidage relative to a given sphere within a random assembly of packed spheres is of interest, particularly in defining local transport coefficient variations as mentioned in this paper, where experimental measurements of various geometric packing properties are used to estimate the probability distribution of this voidage at any given distance.

TL;DR: In this article, a method for the determination of the interfacial area between a gas and a liquid and of the surface renewal rate of this interface was proposed based on the oxidation of a concentrated aqueous sulphite solution with gaseous oxygen in the presence of cobaltous sulphate as a catalyst.

TL;DR: In this article, the authors classified solutes according to their ability to impede or promote movement of a free interface, and explained the influence of concentration of the solute on the obstruction of movement.

TL;DR: In this article, the results of liquid extraction accompanied by fast pseudo-first order reaction were used to evaluate the effective area of the interface between the two liquids, and it was found that the alkaline hydrolysis of formate esters could be conveniently employed for this purpose.

TL;DR: The inner dimension of a hexamethylene tetramine has been shown to be 65 ± 10μ as discussed by the authors, which is a critical size below which inclusions are not formed.

TL;DR: In this article, an illustration of Nicklin's conclusions for two-phase flow is given, and application of these conclusions is made to the two phase theory of fluidised beds.

TL;DR: In this article, the kinematic eddy viscosity computed from these measurements agrees well with the previous data on free circular turbulent jets, and the critical impact pressure is shown to increase with increasing surface tension of the liquid.

TL;DR: In this article, the intrinsic hydrodynamic resistance of a rigid particle of arbitrary shape, immersed in an arbitrary quasistatic Stokes flow extending to infinity, may be represented by a pair of symbolic, dyadic operators.

TL;DR: In this article, the effect of drop volumes of variables like volumetric flow-rate, interfacial tension, continuous phase viscosity and capillary diameter on drop volumes was studied.

TL;DR: In this article, a theory is given to describe the motion of a small spherical bubble in an inviscid liquid which is in forced oscillation with an up and down movement.

TL;DR: In this paper, it is shown that for both metallic (conducting) and non-metallic particles high rates of heat transfer are achievable between the wall and the solids, but at the same time the net heat exchange with the gas is greatly reduced.