scispace - formally typeset
Search or ask a question

Showing papers in "Chemical Engineering Science in 1964"



Journal ArticleDOI
Novak Zuber1
TL;DR: In this article, a steady-state solution of the governing set of equations is applied to an analysis of sedimentation and of fluidization (batch, cocurrent and countercurrent) for the laminar flow regime.

346 citations


Journal ArticleDOI
TL;DR: In this paper, it was shown that the intrinsic hydrodynamic resistance of an arbitrary particle to translational motion through an incompressible, unbounded, viscous fluid can be represented by a symmetric second-rank tensor (dyadic), uniquely determined by the exterior geometry of the particle.

281 citations


Journal ArticleDOI
TL;DR: Theoretical equations are developed to describe mass transfer around any solid or rapidly circulating axisymmetric body of revolution as discussed by the authors, which apply only when the Peclet and Schmidt numbers are large in value.

262 citations


Journal ArticleDOI
TL;DR: In this paper, a phenomenological scheme is formulated for calculating the quasistatic Stokes force and torque on a rigid particle of any shape immersed in a flow field which tends to an arbitrary Stokes flow at infinity.

246 citations


Journal ArticleDOI
TL;DR: In this article, a theoretical calculation of the low Reynolds number resistance of a rigid, slightly deformed sphere to translational and rotational motions in an unbounded fluid is presented, where explicit expressions are derived which relate the Stokes resistance dyadic, the torque dyadic and the location of the centre of hydrodynamic stress of the particle to its geometry.

175 citations


Journal ArticleDOI
TL;DR: In this paper, the Coupling tensor has been used to characterize the intrinsic hydrodynamic resistance of rigid particles to translational and rotational motions in Stokes flow, via two fundamental symmetric tensors.

172 citations


Journal ArticleDOI

169 citations


Journal ArticleDOI
TL;DR: In this paper, a phenomenological scheme is formulated for relating the Stokes hydrodynamic force and torque experienced by a rigid body in an otherwise uniform shear field to the rate of strain dyadic of the latter.

143 citations


Journal ArticleDOI
TL;DR: In this paper, the authors measured the response to a pulse of ionic tracer, injected into the impeller zone, with a conductivity cell around the turbine-stirred, baffled vessel and obtained the circulation time, i.e., the average time required for a fluid element to complete one circulation around the tank.

126 citations


Journal ArticleDOI
TL;DR: In this paper, an equation for the frequency of coalescence of uniformly sized drops in a homogeneous isotropic turbulent-flow suspension of infinite extent is proposed, based on the assumption that most collisions between drops result in cohesion or coalescence, but for coalescence to occur, the relative velocity along the line of centres of two drops at the instant of collision must exceed a critical value.

Journal ArticleDOI
TL;DR: In this paper, the distribution of liquid droplet mass velocity and local linear velocity for the gas core in air/water annular flow were presented using a sampling/impact probe which was maintained in a position far from the water injector.

Journal ArticleDOI
TL;DR: In this paper, the mass transfer coefficients of carbon dioxide bubbles in the size range 0·4 d e d e and 0.1 cm in equivalent spherical diameter were reported. But the shape of the bubble was also recorded at the instant its solution rate was being measured.

Journal ArticleDOI
TL;DR: In this article, the shape and size of gas clouds as they form around bubbles in two-dimensional fluidized beds of spherical and irregular particles is described. And the behavior of clouds as their parent bubbles split and coalesce was described.

Journal ArticleDOI
TL;DR: In this article, the moment-of-momentum balance for moving surfaces with simultaneous mass transfer to the adjacent phases is developed to show that the surface stress tensor is symmetric.

Journal ArticleDOI
TL;DR: In this paper, the authors established equations for the mass transfer coefficient in the continuous phase from a single spherical bubble or drop, valid for the whole range of values of the tangential component of velocity at the interface.

Journal ArticleDOI
TL;DR: In this article, the dispersion during the circulation of a tracer pulse, injected into the impeller zone of a turbine-stirred vessel, was investigated, and a model of the imperfect mixer was presented, which showed good agreement with the experimental data over a large range of vessel diameters and impeller diameters.

Journal ArticleDOI
TL;DR: In this article, the rate-controlling mechanism was found to be the surface reaction on dual sites, without dissociation, and the adsorption-and kinetic coefficients were determined by the method of least squares applied to the reaction rate equation.


Journal ArticleDOI
TL;DR: In this article, the hydrodynamic instability theory is used in order to establish the conditions under which the Marangoni effect produces interfacial turbulence, and the criteria of instability differ in this case essentially from that valid for the case of diffusion without chemical reaction.



Journal ArticleDOI
TL;DR: In this article, a turbulent jet of hot air is measured in terms of the RMS temperature (or concentration) fluctuations at different points in the jet, and also the fraction of time for which the temperature or concentration of jet fluid at a specified point exceeds a specified value; the effect of the magnitude of the molecular diffusivity on the intimacy of mixing is appreciable.

Journal ArticleDOI
TL;DR: In this paper, the effect of variable fluid properties was isolated by varying the local wall-to-bulk temperature difference at fixed values of the local Reynolds and Prandtl numbers.

Journal ArticleDOI
TL;DR: In this article, the condensation coefficient for water near 0°C and 43°C was mesaured using the technique of vaporization into a closed system and was found to be 0·042 and 0·027 respectively.

Journal ArticleDOI
TL;DR: In this paper, a turbulent jet of hot air is measured in terms of the RMS temperature (or concentration) fluctuations at different points in the jet, and also the fraction of time for which the temperature or concentration of jet fluid at a specified point exceeds a specified value; the effect of the magnitude of the molecular diffusivity on the intimacy of mixing is appreciable.

Journal ArticleDOI
TL;DR: In this paper, the Danckwerts theory of mass transfer with random surface renewal was adapted to the case of a freshly contacted liquid-liquid interface, and two new designs of liquid liquid contactor were developed: a wetted wall column (contact time 0·5−10 seconds) and a horizontal contactor (100−900 seconds).

Journal ArticleDOI
TL;DR: In this article, the Danckwerts surface-renewal model was used to predict the absorption rate of CO2 in carbonate-bicarbonate buffer solutions containing arsenite as a catalyst.

Journal ArticleDOI
TL;DR: In this article, the rates of absorption of various gases into turbulently stirred water have been measured, both with carefully cleaned surfaces and with surfaces covered with varying amounts of surface active material.

Journal ArticleDOI
TL;DR: In this article, it is shown that five different mechanisms of mass transfer in forming drops and bubbles have been proposed in the literature, for a sphere growing uniformly with time, can be described by the equation: where NA is the mass transferred from the drop or bubble in time t, and df is the drop diameter at the end of the formation period tf.