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  • Industrial Chemistry  (5)
  • Industrial Chemistry and Chemical Engineering  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 15 (1992), S. 219-223 
    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: Results of experimental investigations on the influence of turbulence intensity and pitch-to-diameter ratio on heat transfer and pressure drop in single rows of plain tubes are presented. Vertically arranged tubes with 16 different pitch-to-diameter ratios between 1.26 and 5.73 were heated by saturated steam, condensing inside, and cooled outside by air in cross-flow. The turbulence intensity in the entrance cross-section was enhanced by means of different biplanar grids installed in the test section of a wind tunnel upstream of the single rows. The mean streamwise turbulence intensity behind the grids, measured with a constant temperature hot-wire anemometer, varied between 0.8% and 38.8%. Reynolds numbers ranged from 4 × 103 to 2 × 105. For single rows, the measurements show that the Nusselt number for a given turbulence intensity increases with increasing Reynolds number. In the investigated range of Reynolds numbers, the drag coefficient is only slightly influenced by the inlet turbulence intensity. The use of turbulence grids thus leads to higher efficiencies of heat exchangers.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 12 (1989), S. 406-413 
    ISSN: 0930-7516
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: During molecular distillation in a falling film apparatus, temperature and concentration of the more volatile components undergo a marked decrease in axial and radial directions, due to the distillation in vacuo. The gradients produce changes in the rate of surface evaporation and separation efficiency along the flow path. A theoretical study of this problem is presented for binary mixtures. The respective differential equations for heat and mass transfer in the liquid film are solved numerically. As the results demonstrate, the aspect ratio of an apparatus should be large when a high separation is required and small when a high distillation rate is more important.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Die bekannte Graetz-Nußelt-Lösung für den Wärmeübergang laminarer Rohrströmungen setzt ausgebildete Geschwindigkeitsprofile voraus. Sofern jedoch bei Beginn einer Beheizung oder Abkühlung das Geschwindigkeitsprofil noch nicht ausgebildet ist, überlagern sich die hydrodynamische und die thermische Einlaufströmung. Dieses Problem wird unter Annahme konstanter Stoffwerte untersucht.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Das Zustandsverhalten der Viskosität und Wärmeleitfähigkeit reiner Fluide wird an Hand von Zustandsdiagrammen diskutiert. Wie sich hierbei zeigt, kann man die gesamte Zustandsfläche in drei Bereiche aufteilen, in denen besonders einfache Ansätze für Zustandsgleichungen möglich sind. Diese müssen bestimmten Bedingungen am kritischen Punkt und für den Grenzfall des verdünnten Gases genügen. Für eine Auswahl von Stoffen werden vollständige Gleichungen angegeben und mit Meßwerten verglichen. Die Genauigkeit ist für technische Rechnungen zufriedenstellend.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This special event held at the 1996 Annual Meeting of the GVC addressed the bright and the dark sides of technological forecasting. The review article on pp. 44 to 54 presents the content of a lecture delivered by Prof. Dr. ORTWIN RENN, Baden-Württemberg Academy for Assessment of the Consequences of Technology. As an introduction to the assessment of the consequences of technology, Prof. Dr.-Ing. KARL STEPHAN, University of Stuttgart, examined the significance of the assessment of the consequences of technology for the professional activities of the engineer. In this issue we publish extracts from his lecture.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 33 (1961), S. 338-343 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Es wird eine analytische Lösung für den Wärmeübergang laminar strömender Stoffe in ringförmigen Querschnitten angegeben. Unter der Annahme einer hydrodynamisch ausgebildeten Strömung und einer konstanten Temperatur der Rohrwände werden folgende Fälle behandelt: 1. Außenrohr isoliert, Innenrohr beheizt oder gekühlt, 2. Innenrohr isoliert, Außenrohr beheizt oder gekühlt, 3. beide Rohre beheizt oder gekühlt, wobei die Wandtemperaturen der beiden Rohre auch voneinander verschieden sein können. Die Ergebnisse der Rechnung lassen sich durch einfache Gleichungen darstellen. Die mittlere Nußelt-Zahl Nu ist abhängig von einer thermischen Einlaufzahl L/D Pe, dem Durchmesserverhältnis Di/Da und einer Temperaturkennzahl Θ, die jedoch nur im Fall des beidseitig beheizten oder gekühlten Ringquerschnittes auftritt.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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