ISSN:0009-286X    

DOI:10.1002/cite.330601202

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractFormation and coalescence of bubbles and droplets.Generation and coalescence of bubbles and droplets are essential requirements for technical reactions and exchange processes. The paper deals with the dispersion of gases and liquids with the aid of single orifices and of sieve plates in liquids of various viscosities under gravity and centrifugal conditions and furthermore with the mechanical foam separation and with the coalescence of drops on inclined plates. The paper summarizes results from the literature as well as from the Sonderforschungsbereich (SFB) 153 at the Technical University of Munich.

ISSN:0009-286X    

DOI:10.1002/cite.330601203

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractMacro‐ and micromixing in stirred tanks.Macromixing time, based on turbulence theory, is calculated theoretically as a function of the specific power input, the kinematic viscosity, the Schmidt number, and the degree of segregation. A comparison of the micromixing time with data for macromixing found in literature reveals that the micromixing time governs the reaction for very small vessel diameters. If the vessel diameter is greater than the critical size than the turbulent macromixing time controls the mixing process. The micromixing time θmikrois calculated by means of the experimental results of the turbulent velocity distributions in different stirred vessels for several geometrical arrangements of stirred tanks and different positions of feed input. The calculated data for turbulent mixing times are only valid for geometrically optimized stirred vessels. The necessary mixing time may increase or, if a chemical reaction of 2nd order takes place, the desired yield of the product may decrease considerably if the geometrical conditions are not taken into accou

ISSN:0009-286X    

DOI:10.1002/cite.330601204

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

ISSN:0009-286X    

DOI:10.1002/cite.330601205

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

ISSN:0009-286X    

DOI:10.1002/cite.330601206

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

ISSN:0009-286X    

DOI:10.1002/cite.330601207

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

ISSN:0009-286X    

DOI:10.1002/cite.330601208

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

ISSN:0009-286X    

DOI:10.1002/cite.330601209

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

ISSN:0009-286X    

DOI:10.1002/cite.330601210

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

ISSN:0009-286X    

DOI:10.1002/cite.330601211

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY