Showing papers in "Chemical Engineering Science in 1977"

TL;DR: In this paper, phenomenological models are proposed to describe drop breakup and coalescence in a turbulently agitated liquid-liquid dispersion, and the breakage and rate functions are developed and used to solve the general population balance equation describing drop interactions in a continuous flow vessel.

TL;DR: In this paper, data for heat transfer from packed beds are reexamined in the light of new insights, including a length effect resulting from a higher bidderpϵR(1-ϵ)=0.27.

TL;DR: In this paper, a correlation valid for a free liquid trickling, modified in order to take into account the effect of the pressure drop, is proposed and used to correlate liquid holdup in the presence of a concurrent gas flow.

TL;DR: In this paper, a systematic formulation of the conservation equations of momentum and energy is given, and the cooling of a monofilament proves to be independent of the drawing speed, which compares well with the results obtained in practice.

TL;DR: In this paper, the phenomenon of size spreading of a narrow crystal-size distribution due to fluctuations in growth velocity was modeled using an effective numb and growth diffusivities of the order of 100μm2/min were calculated for sugar crystals grown from pure syrups and result in typical growth Peclet num.

TL;DR: In this paper, the simulation of a reactor for a strongly exothermic process based on a model accounting for radial void, velocity and temperature profiles is compared with the predictions based upon a less refined model which does not consider the effect of radial void and velocity profiles.

TL;DR: In this paper, the authors derived reaction schemes for the thermal cracking of ethane, propane and their mixtures from observed product distribution, radical mechanisms, and thermodynamic principles and determined the rate parameters in a systematic way by estimation techniques minimizing a multi-response objective function.

TL;DR: In this paper, the effect of intraparticle forced convection on a heterogeneous reaction within a porous catalytic pellet is examined, and it is found that an appreciable enhancement of the catalyst performance can be expected for liquid-phase reactions on coarse-grained particles.

TL;DR: In this paper, general equations are presented to describe multi-component adsorption from a finite bath onto adsorbent particles, where external film resistance and diffusional resistance within the particle are both included.

TL;DR: In this paper, Tsypkin's analytical methods for approximate solution of this and higher order problems are elaborated and tested for relay feedback controllers to maintain process states near unstable steady states, the CSTR with an irreversible exothermic reaction.

TL;DR: In this paper, a theoretical approach is presented which shows how the interaction of bubble size distribution and bubble rise velocity functions leads to predictions of the overall steady state hold-up in a bubble column within which the liquid flow is understood.

TL;DR: In this article, a theoretical equation was derived by dealing with the instability problem of such waves and an experimental correlation was worked out on the basis of the derived theoretical equation and experimental data.

TL;DR: In this paper, the authors examined the influence of operating conditions and liquid properties on the frequencies of bubble passing, coalescence and breakup in high speed cinematography and found that there was a critical distance at which the leading bubble began to exert an noticeable influence on the following one.

TL;DR: In this article, the effect of radiation from wall to wall on a cylindrical passage is investigated and various approximations for the length required for 99% conversion are discussed.

TL;DR: In this paper, the steady state and dynamic behavior of two typical vinyl polymerizations (polymethylmethacrylate and polystyrene with AIBN) carried out in a CSTR has been analyzed.

TL;DR: In this paper, the authors provide quantitative information on the drag coefficients for isolated gas bubbles moving in the low and high Reynolds number region and bubble shapes and velocity transition and discontinuity in non-Newtonian media.

TL;DR: In this article, surface heterogeneity can induce sustained kinetic oscillations, when a simple, isothermal reaction occurs on a catalytic surface, and the proposed model demonstrates that these oscillations may occur for realistic values of surface heterogeneity.

TL;DR: In this paper, the authors developed a dynamical model of a jacketed non-adiabatic tubular reactor and the effect of the wall heat capacity is briefly examined, and the distributed stability and feed-back control problems are defined and the method of orthogonal collocations is used to obtain a discretized model.

TL;DR: In this article, the driving force for crystallization in a binary system is considered from the thermodynamic viewpoint, and exact relationships, derived for particular cases, are compared with commonly used expressions of supersaturation calculated from solution concentrations.

TL;DR: In this paper, the kinetics of the catalytic air-oxidation of o-xylene to phthalic anhydride over various commercial V2O2 and TiO2-V2O 2 catalysts are extended and a model derived which correctly predicts the temperature and yield profiles in a quasi-isothermal fixed-bed reactor of commercial dimensions.

TL;DR: In this article, the analysis of the mass transfer in a bundle of parallel capillaries with various diameters is presented, and it is shown that within a certain range the achievable changes of the concentration are almost independent of mass flow rate, the diffusivity and the magnitude of the interface.

TL;DR: In this article, it is shown that the dispersion of drops in a gravitational field transverse to the flow can be predicted using correlations for the terminal velocity and for the drop diffusivity.

TL;DR: In this paper, a mathematical model to describe the protonation of weak acid ion exchange resins with various acids has been developed and the charge profiles calculated using the theory are demonstrated by photographs.

TL;DR: In this article, a cationic surfactant was used to promote flotation, and the charge on the particles and bubbles was controlled by addition of sodium sulphate solution.

TL;DR: In this article, a mechanistic model of the interaction between bubbles forming at orifices and the gas in the chamber below the orifice is presented. But the model's experimental confirmation over a wide range of variables is not yet available.

TL;DR: The solubility data for gases in alkane solvents are frequently required in the petroleum and petrochemical industries, data for H 2 S (for example) bein The solubilities of CO 2 and H 2 s have been measured as functions of temperature in the n -alkanes C 6 to C 16 at normal pressure less.

TL;DR: In this article, the selectivity of a sequence of isothermal irreversible heterogeneous reactions within a catalytic pellet is investigated under conditions where intraparticle forced convection is a non-negligible transport mechanism.