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  • 1
    Electronic Resource
    Electronic Resource
    Effects of corrugation parameters on fluid mixing characteristics in corrugated passages (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 1465-1465 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Static mixers are well established in process engineering. Their particular advantages are in-line mixing, no moving parts, low power consumption, and simultaneous homogenization of residence time behavior. Several species of static mixers are well known. An example of their arrangement is based on corrugated passages formed by layers of single plates with opposing orientation. Until now, the corrugation parameters of this species have mainly been designed according to few experimental studies. However, flow phenomena, implied by the geometry of the corrugated structure, are of significant influence on the mixing behavior, the pressure drop, and the residence time characteristics in corrugated passages. In new investigations, the effects of a variety of corrugation parameters on flow phenomena, mixing characteristics/and pressure drop have been systematically determined. The results prove that there are quite different kinds of flow phenomena depending on the geometrical parameters of the structure. Some parameter combinations lead to no mixing at all, others lead to a homogeneous mixing within a small length. Examples are shown of flow behavior in corrugated passages; here the flow has been traced locally making the flow direction evident.The effects of corrugation parameters on the fundamental flow phenomena will be discussed. In order to describe and predict the flow behavior in these corrugated passages, a model has been set up based on the fundamental flow phenomena. This model allows the simulation of flow behavior in corrugated passages, thereby allowing, also, the simulation of the mixing characteristics and the residence time behavior of the fluid in these structures. Examples of the simulation, where the local addition of a tracer and its mixing across the structure has been simulated, are shown. Further results of flow simulation on mixing characteristics and dynamic aspects will be compared to experiments. Combined with the pressure drop in corrugated passages, the model allows the optimization of motionless mixer design. Several aspects of structure optimization will be discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857999
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  • 2
    Electronic Resource
    Electronic Resource
    Flow phenomena and local heat and mass transfer in corrugated passagesPaper presented by G. Gaiser at the “Jahrestreffen der Verfahrens-Ingenieure”, Hannover, September 21 to 23, 1988. (1989)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 12 (1989), S. 400-405 
    Details
    ISSN: 0930-7516
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Flow phenomena, local heat and mass transfer and pressure drop of corrugated passages in process equipment are examined. Based on a method for measuring local heat and mass transfer, developed in previous investigations, a procedure has been formulated for the determination of local heat and mass transfer in corrugated passages. Using the analogy between heat and mass transfer, this technique allows the determination of heat transfer distributions in any structures with high local resolution. The corresponding pressure drop is presented together with the local and integral heat and mass transfer of different structures. It is shown that differences in heat and mass transfer as well as in pressure drop are due to different flow phenomena which also characterize mixing behaviour.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ceat.270120157
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of turbulence on heat and mass transfer in stagnation flowsPaper presented at the “Jahrestreffen der Verfahrens-Ingenieure”, Freiburg, September 30 to October 2, 1987.Dedicated to Professor Dr. Josef Kestin on the occasion of his 75th birthday (1989)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 12 (1989), S. 176-187 
    Details
    ISSN: 0930-7516
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The influence of turbulence on local heat and mass transfer is systematically analyzed. Essential prerequisite is the availability of measurement methods, based on convective mass transfer, which allow the visualization of heat and mass transfer distributions. The results show that, even at low turbulence intensities, the flow and transport phenomena are decisively influenced by the specific design of turbulence grids and the orientation of the grid wires with respect to the stagnation line. Thereby, two different flow mechanisms occur which may interact. The anisotropy of grid turbulence leads to the “wire-gap effect” depending on the actual position of the grid wires in relation to the stagnation line. The other mechanism is based on the wavy wake velocity distribution behind screens and grid which, in conjunction with the centrifugal instability of stagnation flows, may lead to longitudinal vortices. The results indicate why turbulence has not been sufficiently considered in the available (semi-) empirical correlations. Information needed for an accurate prediction of heat and mass transfer in turbulence flows is discussed.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ceat.270120124
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  • 4
    Electronic Resource
    Electronic Resource
    Örtlicher Wärmeübergang und örtliche Wärmeströme in Rippenrohr-WärmeübertragernVortrag von G. Schüz auf dem Jahrestreffen der Verfahrens-Ingenieure, 3. bis 5. Okt. 1990 in Stuttgart. (1993)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 65 (1993), S. 195-197 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330650213
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  • 5
    Electronic Resource
    Electronic Resource
    Strömungs- und Transportvorgänge in RohrbündelwärmeübertragernVortrag von H. LI anläßlich der GVC-Fachausschußsitzung „Wärme- und Stoff übertragung“, 7./8. März 1996 in Lahnstein. (1997)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 69 (1997), S. 119-122 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330690121
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  • 6
    Electronic Resource
    Electronic Resource
    28. Plattenwärmeübertrager mit asymmetrischer Zuordnung gegenüberliegender Prägestrukturen - Strömungsvorgänge und örtlicher Wärmeübergang (1996)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 68 (1996), S. 1080-1080 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    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/cite.330680930
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  • 7
    Electronic Resource
    Electronic Resource
    Wärme- und Stoffübergang in Katalysatoren mit regelmäßiger Formgebung (1989)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 61 (1989), S. 729-731 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330610912
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  • 8
    Electronic Resource
    Electronic Resource
    Sichtbarmachung und Bestimmung der örtlichen Stoff- und Wärmeübertragung an festen Wänden in FlüssigkeitsströmungenVortrag von W. KÜHNEL anläßlich der GVC-Fachausschußsitzung Wärme- und Stoffübertragung, 25./26. Februar 1997 in Würzburg. (1998)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 70 (1998), S. 531-534 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330700508
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  • 9
    Electronic Resource
    Electronic Resource
    Meßmethoden konvektiver StoffübertragungVortrag auf dem Jahrestreffen der Verfahrens-Ingenieure, 28. bis 30. September 1977 in Stuttgart. (1978)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 50 (1978), S. 81-90 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Methods of measuring convective mass transfer. The principal methods of measuring convective transfer of momentum, heat, and mass are surveyed on the basis of the three-fold analogy existing between the transfer of momentum, heat, and mass. The most simple and most sensitive method is the mass transfer technique based on the principle of absorption with chemical reaction and coupled colour reaction. It is shown by selected examples that this measuring technique is already developed to the point where it serves adequately for the solution of most complex problems met with in practice. It is distinguished by its high accuracy of measurement, simple application, high local resolution, and its utilizability both for developable as well as for undevelopable surfaces. By way of the local mass transfer observable as colour-intensity distribution it also affords a simple and illustrative means of making flow processes on solid surfaces visible. The quantitative evaluation is accomplished by reflectance photometry; quantitative image processing methods are available for complex distributions. In addition, it is shown that the mass transfer technique is also suitable for practical utilization as a method for measuring turbulence. The measuring principle is based on the extremely high dependence of the length of transitional separation bubbles in the nose section of flat plates of finite thickness in longitudinal flow on the turbulence intensity.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330500204
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  • 10
    Electronic Resource
    Electronic Resource
    Local heat transfer and heat flux distributions in finned tube heat exchangers (1992)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 15 (1992), S. 417-424 
    Details
    ISSN: 0930-7516
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A detailed analysis of the effect of local heat transfer distributions, which were determined experimentally, on temperature distributions in the fins and in the fluid between two adjacent fins of finned tube heat exchangers is presented. The heat transfer distributions, obtained by a mass transfer technique, prove to be very inhomogeneous over the fin surface, leading to variable results for fin efficiency calculated by the conventional method. In addition, the effect of temperature variation in the fluid, which is usually neglected in fin analysis, is shown in many cases to exert a very strong influence on fin efficiency and total heat flux. For the optimization of fin designs, a combined analysis of local heat transfer, conduction resistance in the fin and temperature variation in the passage is indispensable.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ceat.270150609
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