Showing papers in "Chemical Engineering Science in 1983"

TL;DR: In this article, a novel method is presented for the design of heat exchanger networks, which combines sufficient simplicity to be used by hand with near certainty to identify "best" designs, even for large problems.

TL;DR: In this paper, a semi-empirical model was formulated to correlate the experimental kinetic data, which revealed that the formation kinetics were dependent on the interfacial area, pressure, temperature and degree of supercooling.

TL;DR: In this paper, the authors consider the simple case of uniform temperatures and concentrations in the isothermal CSTR and the simplest of reaction schemes: (i) quadratic autocatalysis (A + B →2 B ); and (ii) cubic autoccatalysis ( A + 2 B →3 B ).

TL;DR: The results for DEA and DIPA were analyzed by means of a zwitterion-mechanism which was derived from the mechanism originally proposed by Danckwerts as mentioned in this paper.

TL;DR: It is shown that dynamic resilence is determined by characteristics inherent in the system and that it is independent of the imposed controller structure and type.

TL;DR: In this paper, the Brinkman-equation is solved by an equivalent variational problem in order to obtain steady flow profiles which satisfy the conditions w = 0 and e = 1 at the container wall of a packed bed.

TL;DR: In this article, the minimum utility calculation for a heat exchanger network synthesis is formulated as a transportation problem from linear programming, allowing one to develop an effective interactive computing aid for this problem.

TL;DR: A systematic treatment of the dynamics and control of acid-base reactions is presented and a new scheme for adaptive control of pH is proposed, relating pH to the reaction invariant state variables.

TL;DR: In this paper, the authors applied the theoretical development put forth in Part II to several two-dimensional, spatially periodic porous media in order to determine components of the dispersion tensor for Peclet numbers ranging from 1 to 104.

TL;DR: In this paper, a model is derived for a fluidized bed that enables its steady state particulate expansion to be predicted as a function of superficial velocity from the initial (packed bed) condition to the final fully expanded (single suspended particle) state.

TL;DR: In this paper, a general theory for calculating the dispersion tensor for pulsed systems in spatially periodic porous media is presented. But the analysis has its origin in the original work of Taylor, and the results quite naturally reduce to the Taylor-Aris result for passive dispersion when applied to the case of laminar flow in a tube.

TL;DR: The design of individual distillation columns into context with the heat integration for the overall process is put into context.

TL;DR: In this paper, the effect of physical properties of the fluid (surface tension, ionic strength, liquid viscosity) and that of the non-Newtonian behavior on mixing time was studied.

TL;DR: Singularity theory with a distinguished parameter, as developed by Golubitsky and Schaeffer, is a very useful tool for predicting the influence of changes in a control or design variable on the steady-state of lumped-parameter systems as mentioned in this paper.

TL;DR: In this paper, a general model of adsorption of surfactants at a gas-liquid surface has been developed, which accounts for both the diffusion in the bulk and the barrier to adaption.

TL;DR: An algorithm which is readily computer implementable for the synthesis of heat exchanger networks by permitting the user to impose constraints disallowing in part or in total the matching of any of the stream pairs is presented.

TL;DR: In this article, the authors considered the dispersion of a pulse of solute in a capillary tube undergoing irreversible, heterogeneous reaction or reversible adsorption at the tube wall.

TL;DR: In this article, a population balance equation that governs the floc size distribution in turbulent flow, incorporating both the splitting and erosion mechanisms of floc breakage has been presented, and the experimentally determined size distributions are then fit to those computed from the population balance equations, using constrained nonlinear least squares.

TL;DR: In this paper, a mechanism of particle growth is proposed in which the strength of inter-particle bridges and the extent of fluid drag and inertial forces on particles determine the equilibrium granule form and size.

TL;DR: In this article, the authors used a new model of micromixing, based on the spectral interpretation of mixing in the isotropic, homogeneous turbulent field to evaluate the influence of the intensity of mixing on the rate of precipitation and on the particle size of the product obtained in a stirred vessel with ideal macromix.

TL;DR: In this article, the Bodenstein numbers for three different lengths of draught tubes were measured for a laboratory concentric-tube air-lift reactor operating with air-water mixtures.

TL;DR: In this paper, the relationship between the diffusion coefficient of asphaltenes and pore size was studied experimentally using track-etched mica membranes, and the results showed a very strong pore-size effect on diffusion coefficient in the range 70-500.

TL;DR: A physical model for the hydrodynamic mechanisms associated with gravity rolling waves in thin liquid films is presented in this paper, where the model is based on a periodical distortion of the hydrogrodynamic boundary layer in the wave front, followed by a recovery process in a wave trail.

TL;DR: In this article, a mathematical model for continuous drying process in a fluidized bed-dryer is presented to describe the heat and mass transfer in gas phase, a Kunii-Levenspiel type, three-phase model representing a dilute (bubble) phase, interstitial Ga Numerical computation based on this model was done to study the effects of the process parameters as particle and bubble-size, gas velocity, inlet gas.

TL;DR: The literature on the stirred tank reactor with consecutive reactions is reviewed and a census of multiplicity diagrams, bifurcation diagrams and phase portraits is given in this article, where the location of the organizing centre, introduced by Balakotaiah and Luss, and some features of the butterfly singularity are discussed with reference to variations in the ratio of activation energies.

TL;DR: Ahsbaet et al. as discussed by the authors found that a critical rate of salinity decrease (CRSD) exists in the water sensitivity of Berea sandstone and determined the CRSD by conducting core.

TL;DR: A new procedure to be used in the sequential design of experiments for discriminating among rival models is presented, consisting of a new design criterion and a model adequacy test based on statistical principles.

TL;DR: In this paper, a model for solid mixing, based on the combined effects of diffusive and convective mechanisms, has been used in conjunction with the experimental resumption of lead glass spherical particles.

TL;DR: In this paper, a theoretical analysis is given of the separation of oxygen and nitrogen in air by a single column pressure swing gas separation process, which includes changes in mass flow due to adsorption.