摘要:

AbstractThe droplets that appear in annular gas‐liquid flows are formed by the eruption of wavelets from the surface of the wall layer. Ninety per cent of the volume of this dispersed liquid is carried by only about 10% of the drops. We find, as suggested by Wicks and Dukler, that the distribution of drop sizes can be characterized by an upper limit, log normal function with only one of the three parameters, the volume median diameter, a strong function of flow conditions. A method for predicting the average diameter is suggested which is consistent with a theoretical interpretation based on a Kelvin‐Helmholtz mechanism, whereby the destabilizing force is the pressure variation over the wavel

ISSN:0001-1541    

DOI:10.1002/aic.690230112

出版商:American Institute of Chemical Engineers    

年代:1977

数据来源: WILEY

摘要:

AbstractAn algorithmic‐evolutionary approach to the systematic synthesis of minimum cost networks of exchangers, heaters, and coolers is proposed. The new approach is easy to apply by hand calculations, requiring no special mathematical background and computational skill from the user. In addition to generating many cheaper networks for sample problems ranging in size from 4 to 10 streams as compared to previous studies, the proposed method provides an explicit theoretical guidance on the optimal exchange among hot and cold streams and on the optimal locations of heating and cooling utilities in the network. It also has a provision for the use of stream splitting and for generating a cyclic network. The new method is particularly effective in the synthesis of minimum cost networks for industrial crude unit preheat recover

ISSN:0001-1541    

DOI:10.1002/aic.690230113

出版商:American Institute of Chemical Engineers    

年代:1977

数据来源: WILEY

摘要:

AbstractThe kinetics and product distributions of the thermal cracking of binary and ternary mixtures of ethane, propane,n‐ andi‐butane were determined in a pilot plant under conditions of residence time, temperature, total pressure, and dilution as close as possible to those prevailing in industrial operation. The kinetics and yields observed with ternary mixtures were compared with those obtained with binary mixtures and with pure components. The experimental selectivities were compared with those which would be obtained from separate cracking and subsequent addition of the product streams. The deviations between the two can be predicted by means of the so‐called global kinetics selectivities, which are based upon the selectivities obtained from the pure components cracking and upon the global rates of cracking of the feed components in the mi

ISSN:0001-1541    

DOI:10.1002/aic.690230114

出版商:American Institute of Chemical Engineers    

年代:1977

数据来源: WILEY

摘要:

AbstractExperimental assessment of theory on the convective dispersion of blood gases by vortices in a curved channel exchanger has demonstrated the impracticality of the proposed design. A nonlinear stability analysis of the fluid dynamics provided an amplitude factor an order of magnitude less than that previously assumed for the system secondary circulations.

ISSN:0001-1541    

DOI:10.1002/aic.690230115

出版商:American Institute of Chemical Engineers    

年代:1977

数据来源: WILEY

ISSN:0001-1541    

DOI:10.1002/aic.690230116

出版商:American Institute of Chemical Engineers    

年代:1977

数据来源: WILEY

ISSN:0001-1541    

DOI:10.1002/aic.690230117

出版商:American Institute of Chemical Engineers    

年代:1977

数据来源: WILEY

ISSN:0001-1541    

DOI:10.1002/aic.690230118

出版商:American Institute of Chemical Engineers    

年代:1977

数据来源: WILEY

ISSN:0001-1541    

DOI:10.1002/aic.690230119

出版商:American Institute of Chemical Engineers    

年代:1977

数据来源: WILEY

ISSN:0001-1541    

DOI:10.1002/aic.690230120

出版商:American Institute of Chemical Engineers    

年代:1977

数据来源: WILEY

ISSN:0001-1541    

DOI:10.1002/aic.690230121

出版商:American Institute of Chemical Engineers    

年代:1977

数据来源: WILEY