摘要:

AbstractExperimental and theoretical coefficients are reported for mass transfer in a turbulent radial wall jet initiated by an impinging free jet. The hydrodynamic solution was obtained by the momentum integral technique, and mass transfer was predicted by analogy.Point mass transfer data were obtained for air‐naphthalene and cinnamic acid‐water systems. At low Schmidt numbers, experimental coefficients were slightly above the theoretical prediction, and followed the theoretical trend with radial distance and nozzle Reynolds number from 10,000 to 60,000. Coefficients at high Schmidt numbers showed large positive deviations from theory, which decreased with radial distance and increased with Schmidt number. These discrepancies were attributed to surface roughness effe

ISSN:0008-4034    

DOI:10.1002/cjce.5450440301

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

年代:1966

数据来源: WILEY

摘要:

AbstractCocurrent flow pipeline reactors would have several advantages for gas‐liquid reacting systems. However, design data are lacking, particularly for absorption rates of gas. The present study was purely exploratory, for the purpose of obtaining the first data on liquid‐phase controlled absorption of gases in horizontal cocurrent two phase flow. CO2and helium were used as gases and water, ethanol and ethylene glycol as liquids over a wide range of operating conditions.The data in the bubble and plug flow regions have been correlated by an equation based on qualitative observation and analogy to the case of a single flowing fluid. The resulting expression, reproduces most bubble flow data to ± 15%, and includes the effects of gas and liquid flow rates, pipe diameter, surface tension, liquid viscosity and diffusi

ISSN:0008-4034    

DOI:10.1002/cjce.5450440302

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

年代:1966

数据来源: WILEY

摘要:

AbstractImpact‐static‐shielded tubes were found to be suitable for measuring time‐average velocities in the jet stream flow generated by the marine propeller. Pumping capacities and entrainment flow were then calculated from these velocity profiles. Pumping capacities were correlated by:Q=KpND3.When the tank contained water:Kp= 0.54. The same probe was found to be useful in evaluating qualitatively the flow patterns from turbine and paddle type impellers. The effect of several parameters on the flow patterns are rep

ISSN:0008-4034    

DOI:10.1002/cjce.5450440303

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

年代:1966

数据来源: WILEY

摘要:

AbstractLongitudinal particle mixing in a screen‐packed, gas‐solid fluidized bed, 5 cm. I.D. × 100 cm. bed height, has been studied by employing a colorimetric concentration impulse technique. The packings were 1/2‐in. × 1/2‐in. open‐end screen cylinders.For the screen‐packed bed the results were in good agreement with a diffusion model, while the results for the unpacked fluidized bed showed that the simple diffusion model could not be readily applied. A cell model was also developed and compared with the diffusion model. The experimental data were analysed in terms of

ISSN:0008-4034    

DOI:10.1002/cjce.5450440304

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

年代:1966

数据来源: WILEY

摘要:

AbstractViscosity measurements for the gaseous state of three binary mixtures of the methane‐carbon dioxide system were carried out at 50, 100, 150 and 200 °C. for pressures ranging from 34 to 680 atm. The compositions of these mixtures were 0.243, 0.464 and 0.755 mole fraction methane. These measurements were made using an unsteady state capillary viscometer which had been used previously in the procurement of viscosities of pure substances.The resulting measurements for these mixtures produced relationships between μ‐μ* and ρ which were consistent in behavior with the corresponding relationships of the pure constituents of this binary system. When these variables were normalized with ϵ the viscosity parameter, and ρc, the critical density, the quantities (μ‐μ*)ϵ and ρRfor these mixtures and the pure components yielded a single relationship which can represent the viscosity behavior for this entir

ISSN:0008-4034    

DOI:10.1002/cjce.5450440305

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

年代:1966

数据来源: WILEY

摘要:

AbstractEquations which predict the course of the reversible first order reaction A ⇄ R in backflow cell models of isothermal flow reactors are developed and compared to those of the continuous dispersion model. The conditions of convergence of the concentration A profile of the backflow cell model to that of the continuous dispersion model were investigated for isothermal first order irreversible (A ⇄ R) reactors of finite size. For this case figures are displayed which allow the models to be compared and the effects of axial mixing to be included in reactor design. The effect of backmixing upon the optimum temperature and maximum product yields ofRis considered for the reversible reaction in the finite reac

ISSN:0008-4034    

DOI:10.1002/cjce.5450440306

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

年代:1966

数据来源: WILEY

摘要:

AbstractThis paper presents a method for the dynamic optimization of a chemical process, applicable whether or not the uncontrolled system is stable at the desired operating conditions. The system has several advantages over other methods of dynamic optimization: (1) Dimensionality is not a limitation; (2) Inequality constraints are handled directly; (3) A two‐point boundary value problem is not encountered; and (4) Control is designed around a stability criterion. Numerical results on a second order stirred‐tank reactor system are presented in order to verily the practicality of the proposed met

ISSN:0008-4034    

DOI:10.1002/cjce.5450440307

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

年代:1966

数据来源: WILEY

摘要:

AbstractThe Enskog modulus, bρx, has been subjected to a generalized treatment to develop reduced state correlations for nonpolar and polar substances that exhibit hydrogen bonding. These correlations present relationships between 1 +bρxand ρR, the reduced density.For nonpolar substances, the PVT data of argon, nitrogen, methane, ethane, and carbon dioxide were used for the development of these relationships, which were found to depend onzc, the critical compressibility factor. PVT data for ammonia, methyl alcohol, and water yielded a different correlation, which is applicable to polar substances which exhibit hydrogen bonding. These relationships were found to depend on the parameter, β = (Tb‐Tm)/M, which quantitatively describes the extent of hydrogen bonding for polar comp

ISSN:0008-4034    

DOI:10.1002/cjce.5450440308

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

年代:1966

数据来源: WILEY

摘要:

AbstractHeal transfer coefficients for steam condensing on the outside of a smooth, and three artificially roughened pipes have been obtained for a condensate film Reynolds Number range of 1,500 to 9,000.Dimensionless local and mean heat transfer coefficient are presented, and in all cases significant increases in tht coefficients for the rough pipes are observed.

ISSN:0008-4034    

DOI:10.1002/cjce.5450440309

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

年代:1966

数据来源: WILEY

ISSN:0008-4034    

DOI:10.1002/cjce.5450440310

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

年代:1966

数据来源: WILEY