摘要:

AbstractPrevious studies in this laboratory have verified the assumption of a single fundamental relation between void fraction and slip velocity for counter‐current flow and batch fluidization of solid rigid particles in water. The present investigation was undertaken to test the applicability of a generalized theoretical analysis to the case of cocurrent counter‐gravity flow.The cocurrent countergravity flow and batch fluidization of two ideal fluidized systems were studied experimentally in a 1 in. diameter column. The systems were 0.0184 in. diameter glass spheres‐water and 0.00396 in. diameter glass spheres‐water. Holdup, pressure drop, and fluid and particle velocities were measured for the cocurrent counter‐gravity flow experiments. Holdup and fluid velocity were measured for the batch fluidization runs.Calculated slip velocities for cocurrent counter‐gravity flow and batch fluidization gave a single curve when plotted against holdup. It is therefore concluded that the experimental results support the validity of the basic assumption for the cocurrent countergravity flow of liquid‐solid systems.The experimental data for cocurrent countergravity flow are in excellent agreement with the operating diagram (holdup as a function of fluid and particle velocities) for cocurrent countergravity flow determined from the holdup‐slip velocity relationship obtained from the batch fluidization experiments. Stable operation in the cocurrent counter gravity flow region where the fluid velocity is less than the single particle transport velocity is possible provided there is mechanical support for the solids and the solids flow rate is controlled at the bottom of the column. The application of the theory to the prediction of behaviour in compound cocurrent countergravity flow fluidized systems

ISSN:0008-4034    

DOI:10.1002/cjce.5450360401

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1958

数据来源: WILEY

摘要:

AbstractAn expression for the energy transferred from air bubbling through the contents of a tank is developed as a function of the fluid depth in the tank, the specific gravity of the tank contents, the vapor pressure of the solution, atmospheric pressure, and the volume of air used. The variation of the energy transfer with height from the bottom of the tank is also developed.It is shown that a portion of the energy transferred is used up in small‐scale turbulence and eddy effects, and the remainder is available for generation of a circulation pattern in the contents of the tank.The information developed is used to determine the pulp circulation pattern in pachuca tanks of various design. The functions fulfilled by pachuca tanks are discussed, and the considerations affecting a choice of tank describe

ISSN:0008-4034    

DOI:10.1002/cjce.5450360402

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1958

数据来源: WILEY

摘要:

AbstractIn establishing a relationship between the plate efficiency and point efficiency for perforated plates, splashing of the liquid was considered as an entirely new mechanism for the mixing of the liquid phase in the direction of the flow. Actual splashing measurements were reported and correlated here, under different conditions of flow rates, weir height, kinematic viscosity of the liquid and some aspects of tray geometry.Plate efficiencies for the desorption of ammonia by air were reported for a perforated plate 36 inches long and 3 inches wide. Concentration gradients across the plate were also measured for the ammonia desorption case and for backward distribution of sodium chloride by splashing. These concentration gradients have been related to the splashing measurements.

ISSN:0008-4034    

DOI:10.1002/cjce.5450360403

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1958

数据来源: WILEY

摘要:

AbstractRecent developments in the manufacture of steel require the use of large quantities of high purity oxygen. To supply this demand new air separation plants have had to be designed and built which are capable of producing oxygen of large tonnage quantities at a minimum purity of 99.5%. This paper will describe in detail the 100 ton/day oxygen units built for Dominion Foundries and Steel Company, at Hamilton, two of which are now in operation. The process flowsheet and the reasons for adopting it is explained. Some of the problems encountered in the choice of certain specialized pieces of equipment are considered. Details of flow, pressure and temperatures are presented for normal operating conditions as well as operating control, methods, and measurement. The paper is illustrated with pictures of the equipment and the assembled plant.

ISSN:0008-4034    

DOI:10.1002/cjce.5450360404

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1958

数据来源: WILEY

摘要:

AbstractNew approaches to studies of spray systems were demonstrated by a series of experiments involving liquid jets spraying in liquids. Attention was focused on those conditions where the stresses causing breakup arose from the inertia of the surroundings and where the induced motion of the surroundings controlled the characteristics of the spray zone in front of the orifice. Experiments and analysis involved principle of balanced stresses, dispersion angle, motion of induced phase, development of spray zone, and drop size.

ISSN:0008-4034    

DOI:10.1002/cjce.5450360405

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1958

数据来源: WILEY

摘要:

AbstractThe throughput, and the sharpness of separation of the oil from the wax, are factors which must be balanced against each other in the design and operation of a lubricating oil dewaxing plant. Changes in this balance can be made by varying such quantities as dilution ratio, speed of filter rotation, quantity of wash applied and wax content of the feed. The relations between these quantities and their effect on the performance of a plant are discussed. The treatment is largely a theoretical one and involves an extension of conventional filtration theory to take account of the quantity of liquid remaining in the filter cake and the rate at which wash can be applied to displace it. The predicted interrelationships between the different variables have been shown by families of curves plotted on coordinates of dewaxed oil output (capacity) and dewaxed oil yield (efficiency). From these diagrams it is possible to predict the effect of changes in the operating conditions on the yield and capacity for a plant.

ISSN:0008-4034    

DOI:10.1002/cjce.5450360406

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1958

数据来源: WILEY