Showing papers in "Chemical Engineering Journal in 1971"

TL;DR: In this paper, a transcendental equation first derived by Howe is solved in order to determine under what conditions a given volume of liquid can form a stable bridge between two given equal coaxial circular plates: the existence of a positive infimum of the set of volumes of stable liquid bridges has been known experimentally for some time.

TL;DR: In this article, the effect of off-low pulsations on a 4 in dia air-fluidized bed of glass beads has been investigated in the frequency range 1 to 10 Hz.

TL;DR: In this paper, an Oseen-type linearisation is employed to obtain equations for slow viscoelastic flow past submerged objects, where the velocity of propagation of shear waves emerges as a primary ordering parameter.

TL;DR: In this article, the propagation of information in a viscoelastic liquid can occur through an elastic shear wave mechanism, and the comparison of the shear-wave velocity with t is made.

TL;DR: Methods of exact and approximate lumping for mixtures in which many parallel first order irreversible reactions occur are discussed and it is shown that a recycled stream may have to be lumped with a different rate expression than the non-recycled stream.

TL;DR: A numerical procedure for generating successive approximations to the optimum policy is developed using the method of steepest-descent in a function space and an exact reflux policy is found for a ternary system by application of the maximum principle.

TL;DR: In this paper, a thin liquid sheet of water flowing at high velocity in a saturated steam atmosphere was used for the determination of the evaporation and condensation coefficient of water, which was determined by interferometric measurement of the thickness variation in the sheet due to phase change.

TL;DR: In this paper, the authors describe a convenient and accurate method of measuring a surface temperature and compare it with conventional methods using thermocouples, and compare their method with the conventional method using a thermocouple.

TL;DR: An improvement of the semi-implicit Runge-Kutta method achieves close fitting of the characteristic root of the diffe efficient as it requires only one inversion at each step.

TL;DR: In this article, the diffusional flux through a pellet of compressed aluminium oxide of eight binary gas mixtures were measured by the steady counter-diffusion technique (Wicke-Kallenbach technique).

TL;DR: This paper presents a technique permitting the derived solution procedure to account directly for the problem numbers also, and an algorithm results which also leads to a new method of obtaining structural information about the equation set.

TL;DR: The paper indicates that the resulting dynamic programming network is a compact structural representation for the equation set and can be used to obtain tearing information for all output set assignments for the equations directly.

TL;DR: A theory to predict the physical absorption mass transfer coefficient for annular two-phase flow systems presented by Banerjee et al. as discussed by the authors was shown to be correct in the case of annular flow systems.

TL;DR: In this paper, the performance of the Galerkin and collocation methods were tested in the local stability analysis of the nonadiabatic tubular reactor with axial mixing (TRAM), without and with recycle, respectively.

TL;DR: In this paper, a renewal model is proposed in which one considers that the elements of liquid in contact with the interface have a micro hydrodynamic structure and are not ‘solid’ as in Danckwerts' theory.

TL;DR: An algorithm for automatically choosing an appropriate set of decision variables which chooses a set which avoids leaving singular or nearly singular N × N equation sets for solution, an effective method for evaluating sparse embedded systems of determinants thus permitting one to avoid singularities.

TL;DR: In this article, a semi-empirical partition function for representing the configurational properties of nonpolar liquids is presented. The partition function reproduces with good accuracy saturated liquid volumes, compressibilities, vapor pressures and energies of vaporisation.

TL;DR: The semi-empirical partition function for real liquids is extended to mixtures using Scott's two-liquid theory and a modified form of the mixing rules agreement is good for simple mixtures and fair for complex mixtures.

TL;DR: In this paper, responses to tracer dye have been measured in a laboratory scale stirred tank using fiber optics for water and aqueous polymer solutions, and the observable segregation decreases markedly as stirrer spee models are also evaluated and compared with those of the current study.

TL;DR: It is shown that when a batch distillation is performed, in which a recycled waste cut is permitted, the optimal reflux policy will, in many cases, be very close to the constant overhead purity policy.

TL;DR: In this paper, the healing exchange between afluid flowing down a tube in the walls of which heat may be generated if the temperature rises above a threshold value is described. But the model is based on a packed bed catalytic reactor.

TL;DR: In this paper, a simplified form of Kubin's theory of gas was used to evaluate axial dispersion due to molecular diffusion in a chromatographic system, and the results showed that the simplified form can be applied to several new gas systems.

TL;DR: A high-level language (PROTOL) based on Algol 60 designed for engineers to write process control programs and compared with the similar Fortran-based language, PROTRAN, devised by the authors.

TL;DR: In this article, a unified time delay model is applied to describe the effects of intrasolid resistance and axial mixing on the outlet response to disturbances in the inlet concentration during steady flow in packed beds.

TL;DR: In this paper, the axial dispersion model was used to represent the combined effects of diffusion, non-uniform reaction rate distribution, and nonuniform velocity distribution in photoreactors.

TL;DR: In this article, a method for solving convective diffusion equations having the form: The method is based on a succession of contractions of this equation up to the equation, which can be described by the above equation, namely diffusion processes near a liquid-fluid interface.

TL;DR: In this paper, the structure of solutions representing the transient behaviour of chemical reactors is discussed and conclusions that might be drawn in an abstract way concerning the structure and properties of solutions are discussed.

TL;DR: The Deborah number, a dimensionless ratio of characteristic fluid and flow times, is often used to correlate turbulent drag reduction data as mentioned in this paper, but the proper definition of this quantity is somewhat elusive.

TL;DR: In this paper, a qualitative study of fluid flow in the neighbourhood of a continuously moving material surface as it passes between a series of contacting rollers is carried out, and boundary layer profiles at the material surface have been visualised and found to deviate from those predicted by a theoretical analysis due to Sakiadis.