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  • 1
    Electronic Resource
    Electronic Resource
    Advances in heat transfer: Bioengineering heat transfer. Edited By Y. I. Chao, J. P. Hartnett, and T. F. Irvine, Jr., Academic Press, 443 pp., 1992 (1992)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 38 (1992), S. 2000-2000 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690381223
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  • 2
    Electronic Resource
    Electronic Resource
    Process modeling using stacked neural networks (1996)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 42 (1996), S. 2529-2539 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A new technique for neural-network-based modeling of chemical processes is proposed. Stacked neural networks allow multiple neural networks to be selected and used to model a given process. The idea is that improved predictions can be obtained using multiple networks, instead of simply selecting a single, hopefully optimal network, as is usually done. A methodology for stacking neural networks for plant-process modeling has been developed. This method is inspired by the technique of stacked generalization proposed by Wolpert. The proposed method has been applied and evaluated for three example problems, including the dynamic modeling of a nonlinear chemical process. Results obtained demonstrate the promise of this approach for improved neural-network-based plant-process modeling.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690420913
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  • 3
    Electronic Resource
    Electronic Resource
    Particle generation in a chemical vapor deposition process with seed particles (1990)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 36 (1990), S. 409-419 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The formation of aerosol particles by gas-phase chemical reaction in the presence of seed particles has been studied experimentally and theoretically. Titanium tetraisopropoxide (TTIP) vapor containing ultrafine TiO2 seed particles was introduced into a laminar flow aerosol reactor, and the properties of produced TiO2 aerosol were measured. By comparing the particle numbers and size distributions of the resulting aerosol with those of the seed particles and those of homogeneously nucleated particles in the absence of seed particles, the effects of initial concentrations of TTIP vapor, reaction temperatures, and properties of seed particles on the suppression of homogeneous nucleation were experimentally clarified. In the theoretical analysis, the population balance equation expressing simultaneous generation of TiO2 monomer, Brownian coagulation and diffusive deposition of TiO2 monomer and aerosols was solved. The observed suppression of homogeneous nucleation by the seed particles is explained qualitatively by the theoretical analysis.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690360310
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  • 4
    Electronic Resource
    Electronic Resource
    Redox catalysis of absorption from reactive bubbles near electrodes (1988)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 34 (1988), S. 1781-1788 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Electrolyzing sparingly soluble gases as they are absorbed from bubbles can be significantly facilitated by addition of a soluble redox couple which serves to increase both mass and charge transfer rates. A diffusion layer model is used to calculate reaction-catalyzed mass transfer rates in regions of boundary layer penetration by reactive bubbles for the case of (m, n)-order irreversible homogeneous reaction. The dissolved redox catalyst is continuously regenerated at the solid electrode surface. Approximate solutions, which relate surface flux to concentration driving force, are in excellent agreement with the numerical solutions under conditions of fast homogeneous reaction and concentrated catalyst (modified Damköhler number and dimensionless catalyst concentration greater than 3). Diffusion layer thickness is calculated from the mass transfer coefficient kp in penetrated regions. A model based on spherical penetrating bubbles is used to determine kp and specific surface area ap of penetrated regions from kpap values that have been measured in gas-liquid flow through a packed bed. The mass transfer behavior provides useful insight into why the penetration process is so effective in increasing overall reaction rates.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690341104
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  • 5
    Electronic Resource
    Electronic Resource
    Mass transfer from dispersed bubbles to electrolyte solution in packed beds (1988)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 34 (1988), S. 1504-1510 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The measurement of gas-liquid interfacial areas and mass transfer coefficients in concurrent upward bubbly flow (uG from 0.02 to 0.16 m/s, uL from 0.0051 to 0.056 m/s) over a packed bed consisting of 1.2 mm glassy carbon particles is described. Specific surface areas were measured by chemical absorption of O2 into Na2SO3 solutions; volumetric mass transfer coefficients were measured by physical desorption of O2 into N2 bubbles. Surface areas were obtained in the range of 4 × 103 to 2 × 105 m-1, much higher than have been previously reported. High areas are related to the use of electrolytes and small packing particles. Bubble size was found to depend primarily on liquid velocity. Volumetric mass transfer coefficients kLaG are also high (0.1 〈 kLaG 〈 2.3 s-1), primarily as a result of high gas-liquid interfacial areas. Mass transfer coefficients kL are small, however. For the smaller bubble dispersions, mass transport is controlled by diffusion rather than by convection.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690340912
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  • 6
    Electronic Resource
    Electronic Resource
    Evaluation and control of particle properties in aerosol reactors (1988)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 34 (1988), S. 1249-1256 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The production of powders by aerosol routes spans a wide range of operating temperatures depending on the type of aerosol reactors used. The dominant mechanism of particle growth and evolution depends highly on the rate at which the reactions producing the condensible species are carried out. Numerical solutions of the discrete-sectional aerosol general dynamic equation that accounts for the interactions of the discrete clusters were obtained for conditions representative of the different types of aerosol reactors used for powder production today. Simplified reaction and coagulation equations that give fast and useful prediction of the evolution of aerosols associated with chemical reactions were derived, and a simple reaction-coagulation model was developed. The effects of reaction rate, initial vapor concentration, residence time, seed particles, and temperature profile on the properties of tine particles produced by gas-phase chemical reactions were evaluated using both models. Results show good agreement between the two.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690340803
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  • 7
    Electronic Resource
    Electronic Resource
    Corrosion handbook. Vol. 1, ed., Dieter Behrens, VCH Publishers, New York, 1988, 333 pp. $450.00 (1989)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 35 (1989), S. 876-876 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690350529
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  • 8
    Electronic Resource
    Electronic Resource
    Axial solid distribution in gas-solid fluidized beds (1962)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 8 (1962), S. 239-244 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Γ-ray attenuation method was applied to determine the axial fluidizing bulk density profile for an air-solid aggregative fluidized bed. Except for beds fluidized at very high air velocities two distinct density zones were noted. The density of the bed in the lower portion of the column was relatively constant for a particular set of operating conditions and did not vary with bed height. The density in the top portion of the bed fell rapidly with bed height.The average density of the lower zone was correlated as a function of the operating variables. The density in the top zone was represented by a one-tail normal distribution curve. A somewhat better correlation was obtained by a two-parameter equation at high air velocities. The effects of operational variables, such as air velocity, static bed height, particle size, and particle-size distribution on these correlations were investigated.Friction-factor correlations based on two different definitions of bed height were also obtained.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690080222
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  • 9
    Electronic Resource
    Electronic Resource
    Laminar-turbulent transitional flow phenomena in isosceles triangular cross-section ducts (1970)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 16 (1970), S. 528-535 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A theoretical analysis of the laminar-turbulent transition phenomenon is presented for the case of steady, isothermal, fully developed flow of Newtonian fluids in straight ducts of constant isosceles triangular cross section. As a result of this analysis, the simultaneous existence of macroscopically large stable regions of laminar and turbulent flow are predicted to occur during the transition phenomenon. The existence of this special type of flow field, which has not been previously predicted theoretically, is shown to be a consequence of the presence of an asymmetric shear stress distribution. The results of an experimental study are also presented. These data verify the predictions made by the theoretical analysis.
    Additional Material: 19 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690160405
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  • 10
    Electronic Resource
    Electronic Resource
    Optimal operation of a variable-volume stirred tank reactor (1971)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 17 (1971), S. 30-37 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: For certain classes of chemical reactions, it is possible to increase the yield of the desired products by choosing appropriate variable-volume operating policies. An analysis of the steady state and semibatch operation of a stirred tank reactor demonstrates operating policies for both the isothermal and adiabatic case to maximize the steady state yield and to produce an improved semibatch yield. Computations carried out by using an analogue computer with a digital logic expansion system demonstrate further relationships between yield increase and operating policy.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690170110
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