摘要:

AbstractThe number of overall liquid transfer units as a function of the total pressure, flow rate, and nozzle height has been measured for the removal of butane and F‐22 refrigerants from water for a flat spray nozzle in a vacuum spray chamber. The number of transfer units increases with the flow rate and with the total pressure with the increase proportional to 0.2 power of the Weber number in which the gas density is used.NOLalso increases linearly with length, but more than two‐thirds of the mass transfer always takes place in liquid sheet attached to the nozzle. Because the rate of mass transfer in a spray chamber is much greater than in a packed column, vacuum spray stripping is recommended for the removal of refrigerants from water and brine in the freezing and hydrate processes for desalination and other slightly soluble gases from aqueous solution in other proces

ISSN:0001-1541    

DOI:10.1002/aic.690230402

出版商:American Institute of Chemical Engineers    

年代:1977

数据来源: WILEY

摘要:

AbstractRecently reported varieties of photoassisted heterogeneous catalysts are summarized. A cylindrical, light carrying, optical fiber coated with a catalyst layer is evaluated as a novel configuration for all such light assisted catalysis. Equations are obtained which describe the light intensity in the fiber and its surrounding catalyst layer. A dimensionless group of the form Φ = (4αcβcdL)/(df) [d=dcfordcλ] determines the relative influence of light loss by all absorption and scattering to light transported in the fiber length. An effectiveness factor ηIfor heterogeneous photoassisted catalysis is determined for reactions which are first order in intensity and without mass transport limitations. Asymptotic forms of ηIare ηI= 1.0 (Φ ≪ 1.0) and ηI=

ISSN:0001-1541    

DOI:10.1002/aic.690230403

出版商:American Institute of Chemical Engineers    

年代:1977

数据来源: WILEY

摘要:

AbstractClosed‐form expressions are presented for predicting vertical concentration distribution of the dispersed phase in the turbulent core of pipe and channel flow. Experimental data obtained with spherical particles, of mean diameterd50comparable to the Kolmogorov microscale, are in good agreement with model predictions. The average value of dimensionless lateral particle diffusivity, ζ = ε/Ru*, determined from these data is approximately 0.25, that is, fairly close to previously reported measurements with much coarser partic

ISSN:0001-1541    

DOI:10.1002/aic.690230404

出版商:American Institute of Chemical Engineers    

年代:1977

数据来源: WILEY

摘要:

AbstractA packed‐bed electrochemical method is presented for the removal of copper from scrap steel. The method is based on the principle that at certain potentials, steel can be passivated in a suitable electrolyte, whereas copper dissolves anodically. A rotating hemispherical electrode was used to determine the polarization curves of copper and mild steel in various electrolytes. Extraction tests were carried out with an electrochemical cell composed of a cathodic carbon packed bed and an anodic bed packed with synthesized steel scra

ISSN:0001-1541    

DOI:10.1002/aic.690230405

出版商:American Institute of Chemical Engineers    

年代:1977

数据来源: WILEY

摘要:

AbstractA mathematical model of combustion in a utility type of pulverized, coal fired furnace is developed by dividing the furnace into a number of isothermal zones. The method dovetails the combustion rate data available for single char particles with a gas flow pattern to predict local combustion heat release rates and local radiation absorption coefficients, which are used as input to a zoned heat transfer model.The furnace heat transfer is shown to be insensitive to combustion related parameters such as coal rank and coal fineness. For carbon in ash, local gas temperature, and to a lesser extent local heat flux, significant variations are predicted. It is concluded that for calculation of radiative heat transfer, combustion data are adequate. Further research activity on ignition and combustion stability, together with the radiative properties of fly ash, is recommended.

ISSN:0001-1541    

DOI:10.1002/aic.690230406

出版商:American Institute of Chemical Engineers    

年代:1977

数据来源: WILEY

摘要:

AbstractCurrent literature describes forced convecting, boiling heat transfer as primarily convective heat transfer. The original evidence for this concept, reported by Dengler and Addoms, was reexamined and found misinterpreted. Nucleate boiling data, instead, correlate with their data. Subsequent use of the concept in correlations and models now requires close scrutiny.

ISSN:0001-1541    

DOI:10.1002/aic.690230407

出版商:American Institute of Chemical Engineers    

年代:1977

数据来源: WILEY

摘要:

AbstractA method was developed for providing continuously wiped and, therefore, clean liquid surfaces in vacuo. By means of a mass spectrometer detector, the absolute evaporation flux from such clean surfaces was measured for diethylene glycol, glycerine, dibutyl phthalate, and oleic acid. The molecular flux from equilibrium vapor was also measured by the same detector. The ratio of the former to the latter, the evaporation coefficient, was found in each case to be close to unity and independent of the temperature.

ISSN:0001-1541    

DOI:10.1002/aic.690230408

出版商:American Institute of Chemical Engineers    

年代:1977

数据来源: WILEY

摘要:

AbstractA laboratory mixed suspension mixed product removal (MSMPR) crystallizer was operated with and without continuous fines segregation and destruction. Predicted improvements in product‐crystal size were observed. By carefully representing the crystallizer flow pattern, quantitative agreement of crystal size distribution with prediction was achieve

ISSN:0001-1541    

DOI:10.1002/aic.690230409

出版商:American Institute of Chemical Engineers    

年代:1977

数据来源: WILEY

摘要:

AbstractA flow type of apparatus is built to give equilibrium gas and liquid samples at elevated pressures and temperatures while minimizing thermal decomposition. Saturated vapor and liquid compositions andKvalues are determined with this apparatus for the binary system hydrogen/tetralin (1,2,3,4‐tetrahydronaphthalene) at four temperatures from 189.6° to 389.1°C, and seven pressures from 20 to 250 atm. Vapor pressures of tetralin are determined with the same apparatus, and values are reported at the four temperatures of this w

ISSN:0001-1541    

DOI:10.1002/aic.690230410

出版商:American Institute of Chemical Engineers    

年代:1977

数据来源: WILEY

摘要:

AbstractThe experimental work reported here gives hydrate forming conditions in the water liquid‐hydrocarbon liquid‐hydrate region for five mixtures of methane andn‐butane. Data available in the literature were used to establish the parameters in a computer program for predicting hydrate forming conditions in condensed systems. The method is shown to be reliable for several systems of widely variable compos

ISSN:0001-1541    

DOI:10.1002/aic.690230411

出版商:American Institute of Chemical Engineers    

年代:1977

数据来源: WILEY