ISSN:0001-1541    

DOI:10.1002/aic.690100203

出版商:American Institute of Chemical Engineers    

年代:1964

数据来源: WILEY

ISSN:0001-1541    

DOI:10.1002/aic.690100204

出版商:American Institute of Chemical Engineers    

年代:1964

数据来源: WILEY

摘要:

AbstractA method is presented for using an adiabatic reactor to study the kinetics of reactions of gases on solid catalysts. The method is based on measurement of the steady state axial profile of temperature or composition in a specially designed adiabatic packed bed reactor. Reaction rates are calculated from these measured profiles by graphical differentitation. The method is applicable for multireaction systems and for any type of kinetic behavior.The method was demonstrated by an experimental study of cumene cracking an silica‐alumina catalyst at 420° to 480°C. The measured reaction rates are in satisfactory agreement with results obtained by other investigators who used isothermal reactors. Areas of application of the adiabatic method are sugges

ISSN:0001-1541    

DOI:10.1002/aic.690100205

出版商:American Institute of Chemical Engineers    

年代:1964

数据来源: WILEY

ISSN:0001-1541    

DOI:10.1002/aic.690100206

出版商:American Institute of Chemical Engineers    

年代:1964

数据来源: WILEY

ISSN:0001-1541    

DOI:10.1002/aic.690100207

出版商:American Institute of Chemical Engineers    

年代:1964

数据来源: WILEY

ISSN:0001-1541    

DOI:10.1002/aic.690100208

出版商:American Institute of Chemical Engineers    

年代:1964

数据来源: WILEY

ISSN:0001-1541    

DOI:10.1002/aic.690100209

出版商:American Institute of Chemical Engineers    

年代:1964

数据来源: WILEY

摘要:

AbstractUnusual heat transfer phenomena have been observed between solid surfaces and fluids near their thermodynamic critical point. To understand better these phenomena temperature and velocity profiles and local heat transfer coefficients were measured for turbulent flow of carbon dioxide in a tube at 1,075 lb/sq. in. abs. (pc= 1,071). The results indicate a severe flattening of the radial temperature profiles, a maximum in the velocity profile between the wall and the tube axis, and a maximum inh' when the bulk fluid temperature passes through the transposed critical temperature.The results can be explained qualitatively by considering the variation with temperature of thermal conductivity near the tube wall and specific heat in the turbulent core.

ISSN:0001-1541    

DOI:10.1002/aic.690100210

出版商:American Institute of Chemical Engineers    

年代:1964

数据来源: WILEY

摘要:

AbstractTurbulent mixing of a dye solution injected at the center of a pipe was studied by means of a new light probe developed for the measurement of concentration fluctuations were made both along the axial distance and across the pipe. The concentration fluctuations persisted longer at the center‐line region than anywhere else; this suggested the use of the decay of intensity at the center as an upper limit. Approximately 99% of the initial intensity decayed within 7.5 ft. (30 L/d). The concentration spectra along the axial distance indicated that the eddies initially undergo a scalar energy cascade. Because of the huge difference in the kinematic viscosity and molecular diffusivities the concentration spectra extend much farther toward high wave numbers than the velocity spectrum. Apparently a state of imbalance resulted between the supply of small eddies and their dissipation; this was marked by the appearance of a small hump in the spectra. The phenomenological approximations of Corrsin and of Beek and Miller could be used for the practical problem of predicting the decay of the intensity of the concentration fluctuations or mixing in the pipe geometry studie

ISSN:0001-1541    

DOI:10.1002/aic.690100211

出版商:American Institute of Chemical Engineers    

年代:1964

数据来源: WILEY

ISSN:0001-1541    

DOI:10.1002/aic.690100212

出版商:American Institute of Chemical Engineers    

年代:1964

数据来源: WILEY