The flow over steep hills has been studied experimentally and numerically. The sinusoidally-shaped hills follow the parametric shape equations of the RUSHIL experiments. In the wind tunnel of the University of Kaiserslautern the flow over the hill was measured with the Laser Doppler Anemometry. Thereby, devices had to be found in order to thicken artificially the boundary layer. The numerical investigation has been carried out using several turbulence models comparing the calculated results with the experimental ones. In order to carry out reliable wind energy power predictions recommendations concerning numerical calculations are given.

The initial fill and the subsequent discharge of containers containing granular material have been modeled using the discrete element method (DEM). In particular, the behavior of granular material in three dimensions is accounted for. The aim is to study the distributions of normal wall forces and pressures developed at the end of filling process (static state) and those developed during outflow from the containers (dynamic state). A hopper, a silo with a hopper bottom, and a flat-bottomed silo have been chosen for DE analysis. The granular material is modeled as a particle assembly consisting of mono-sized, spherical, cohesionless particles. Movement of individual particles during the outflow caused by gravity was also studied. The simulation results obtained in the present work are realistic and show clearly the advantages of DEM to understand the complex flow behavior of granular materials.

Chemie Ingenieur TechnikVolume 72, Issue 7 p. 718-721 Article Numerische Berechnungen undVisualisierung von Geschwindigkeitsfeldern in Rohrbündelwärmeaus tauschern Tatiana Savtchenko Dr.-Ing , Tatiana Savtchenko Dr.-Ing ABB ALSTOM POWER, Postfach 100351, D-68128 Mannheim;Search for more papers by this authorManfred Fallen Dr.-Ing., Manfred Fallen Dr.-Ing. Lehrstuhl für Mechanische Verfahrenstechnik und Strömungsmechanik, Postfach 3049, D-67653 Kaiserlautern.Search for more papers by this authorFritz Ebert o. Prof. Dr.-Ing. habil., Fritz Ebert o. Prof. Dr.-Ing. habil. Lehrstuhl für Mechanische Verfahrenstechnik und Strömungsmechanik, Postfach 3049, D-67653 Kaiserlautern.Search for more papers by this author Tatiana Savtchenko Dr.-Ing , Tatiana Savtchenko Dr.-Ing ABB ALSTOM POWER, Postfach 100351, D-68128 Mannheim;Search for more papers by this authorManfred Fallen Dr.-Ing., Manfred Fallen Dr.-Ing. Lehrstuhl für Mechanische Verfahrenstechnik und Strömungsmechanik, Postfach 3049, D-67653 Kaiserlautern.Search for more papers by this authorFritz Ebert o. Prof. Dr.-Ing. habil., Fritz Ebert o. Prof. Dr.-Ing. habil. Lehrstuhl für Mechanische Verfahrenstechnik und Strömungsmechanik, Postfach 3049, D-67653 Kaiserlautern.Search for more papers by this author First published: 29 November 2000 https://doi.org/10.1002/1522-2640(200007)72:7<718::AID-CITE718>3.0.CO;2-SCitations: 1 Teilergebnisse wurden auf den GVC-Sitzungen 1995 in Goslar und 1998 in Aachen vorgetragen. AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat References [1] Gregorig R. Trommer H.Verminderung des Wärmedurchganges bei ungleichmäßiger Geschwindigkeitsverteilung und ungenauer Rohrteilung, Schweizer. Bauzeitung 11, ;. 701952 15115612174 176701952 [2] Berrsche H.Der Einfluss einer ungleichen Geschwindigkeitsverteilung auf die Leistung eines Wärmetauschers, Chem.-Ing.-Tech. 8. 621990 646650 [3] Linke W.Untersuchungen über Rohrbündel-Wärmetauscher, Chem.-Ing.-Tech. 3. 271955 142148 [4] Linke W. Dia T.Die Bemessung der Zu- und Abflusshauben von Wärmetauschern, Kältetechnik 3.1963 8591 [5] Weber J.Experimentelle Untersuchungen an freifahrenden Düsenkühlern, Abh. d. Aerodynamischen Instituts an der TH Aachen.Heft 61927 [6] Kröll K.Trocknungstechnik. Trockner und Trocknungsverfahren, Zweite Auflage, Springer-Verlag, Berlin, Heidelberg, New York.1992 [7] Dia T.Experimentelle Untersuchungen zur Dimensionierung der Zu- und Abflusshauben von Wärmetauschern, Dissertation, RWTH Aachen.1958 [8] Savtchenko T.Numerische und experimentelle Untersuchungen zum Einfluss einer ungleichmäßigen Geschwindigkeitsverteilung auf Wärmeübergang, Dissipation und Fouling in den Rohrbündeln von Wärmetauschern, Dissertation, Universität Kaiserslautern.1997 [9] VDI-Wärmeatlas, VDI-Verlag, Düsseldorf.7. Auflage1994 Citing Literature Volume72, Issue7Juli 2000Pages 718-721 ReferencesRelatedInformation

Chemie Ingenieur TechnikVolume 67, Issue 11 p. 1489-1491 Kurzmittilungen Verbesserung der Feinstaubabscheidung in Trägheitsabscheidern durch mehrstufige Kondensation in porösen Rohren Dipl.-Ing. Samuel Schabel, Dipl.-Ing. Samuel Schabel Lehrstuhl für Mechanische Verfahrenstechnik und Strömungsmechanik, Universität Kaiserslautern, D-67653 KaiserslauternSearch for more papers by this authorProf. Dr.-Ing. habil. Fritz Ebert, Prof. Dr.-Ing. habil. Fritz Ebert Lehrstuhl für Mechanische Verfahrenstechnik und Strömungsmechanik, Universität Kaiserslautern, D-67653 KaiserslauternSearch for more papers by this author Dipl.-Ing. Samuel Schabel, Dipl.-Ing. Samuel Schabel Lehrstuhl für Mechanische Verfahrenstechnik und Strömungsmechanik, Universität Kaiserslautern, D-67653 KaiserslauternSearch for more papers by this authorProf. Dr.-Ing. habil. Fritz Ebert, Prof. Dr.-Ing. habil. Fritz Ebert Lehrstuhl für Mechanische Verfahrenstechnik und Strömungsmechanik, Universität Kaiserslautern, D-67653 KaiserslauternSearch for more papers by this author First published: November 1995 https://doi.org/10.1002/cite.330671114AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Volume67, Issue11November 1995Pages 1489-1491 RelatedInformation

The calibration of an optical particle counter (OPC) by means of the Aerodynamic Particle Sizer APS (TSI, Model 3310) was investigated. The pulse-height distribution and the aerodynamic size distribution were measured by parallel use of an OPC and the APS. A calibration curve was obtained by comparison of the two different cumulative distribution curves. First calibration results are presented for spherical particles (water droplets and glycerine droplets). A comparison of these results with Mie calculations and aerodynamic calibrations by means of sampling cyclones shows good agreement. Furthermore, measurements were carried out with non-spherical particles. Quartz dust was used for these measurements. In order to calibrate the OPC by means of the APS, the behaviour of both devices was investigated.

Inertial deposition of aerosol droplets (diameter: 1 - 14 mum) on steel spheres (diameter: 3 - 9 mm) was investigated. Air velocity was varied between 7 and 28 m/s (corresponding sphere Reynolds numbers: 1400 - 17 000). The impaction on single spheres as well as that on linear arrays of eight spheres was measured. Theoretical results, based on potential flow investigations were verified by single sphere experiments. Of special interest was the range of lower Stokes numbers, where the theoretically predicted limit of deposition cannot be verified. The experiments on sphere arrays were for the first time performed in the low Stokes number range. Deposition on the leading sphere, relative to that on the shielded spheres, exhibits a maximum in the high Stokes number range, but this changes drastically in the low Stokes number range. Here, maximum deposition can be found on the shielded spheres while the leading sphere shows a markedly lower deposition.

ABSTRACT The “nozzle scrubber” is a wet scrubber in which the scrubbing water is dispersed in the dust laden gas stream by means of one or more pneumatic nozzles. This scrubber is distinguished by an excellent collection efficiency for submicron dust at an unusually low energy and water consumption. No well-defined theory exists for this process. The collection efficiency in the “nozzle scrubber” depends primarily on turbulent diffusion respectively on the interaction of particles and droplets induced by turbulence, and not on inertial separation as in the case of the venturi scrubber. A light scattering device was used to measure the particle distributions. The experimental set-up was built up in a technical scale. The influence of operation parameters, especially water consumption, residence time, and pressurized air, on the grade efficiency has been demonstrated by their systematic variation. The contribution of turbulent diffusion to the collection efficiency has been confirmed.

Chemie Ingenieur TechnikVolume 63, Issue 3 p. 250-252 Kurzmitteilungen Bestimmung der Geschwindigkeiten und räumlicher Orientierungen monodisperser, faserartiger Feststoffpartikeln in einer konvergierenden Düse Dipl.-Ing. Mansur Maleki, Dipl.-Ing. Mansur Maleki Lehrstuhl für Mechanische Verfahrenstechnik und Strömungsmechanik, FB Maschinenwesen, Univ. Kaiserslautern, Postfach 30 49, 6750 Kaiserslautern.Search for more papers by this authorDr.-Ing. Michael Krol, Dr.-Ing. Michael Krol Lehrstuhl für Mechanische Verfahrenstechnik und Strömungsmechanik, FB Maschinenwesen, Univ. Kaiserslautern, Postfach 30 49, 6750 Kaiserslautern.Search for more papers by this authorProf. Dr.-Ing. Fritz Ebert, Prof. Dr.-Ing. Fritz Ebert Lehrstuhl für Mechanische Verfahrenstechnik und Strömungsmechanik, FB Maschinenwesen, Univ. Kaiserslautern, Postfach 30 49, 6750 Kaiserslautern.Search for more papers by this author Dipl.-Ing. Mansur Maleki, Dipl.-Ing. Mansur Maleki Lehrstuhl für Mechanische Verfahrenstechnik und Strömungsmechanik, FB Maschinenwesen, Univ. Kaiserslautern, Postfach 30 49, 6750 Kaiserslautern.Search for more papers by this authorDr.-Ing. Michael Krol, Dr.-Ing. Michael Krol Lehrstuhl für Mechanische Verfahrenstechnik und Strömungsmechanik, FB Maschinenwesen, Univ. Kaiserslautern, Postfach 30 49, 6750 Kaiserslautern.Search for more papers by this authorProf. Dr.-Ing. Fritz Ebert, Prof. Dr.-Ing. Fritz Ebert Lehrstuhl für Mechanische Verfahrenstechnik und Strömungsmechanik, FB Maschinenwesen, Univ. Kaiserslautern, Postfach 30 49, 6750 Kaiserslautern.Search for more papers by this author First published: March 1991 https://doi.org/10.1002/cite.330630314Citations: 1AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Citing Literature Volume63, Issue3March 1991Pages 250-252 RelatedInformation

Chemie Ingenieur TechnikVolume 62, Issue 6 p. 504-505 Wissenschaftliche Forschungsarbeit Bestimmung des Fließverhaltens von Granulaten in Schachttrocknern† Dr.-Ing. Günter Dau, Dr.-Ing. Günter Dau Univ. Kaiserslautern, Lehrstuhl für Mechanische Verfahrenstechnik und Strömungsmechanik, Postfach 30 49, 6750 KaiserslauternSearch for more papers by this authorProf. Dr.-Ing. habil. Fritz Ebert, Prof. Dr.-Ing. habil. Fritz Ebert Univ. Kaiserslautern, Lehrstuhl für Mechanische Verfahrenstechnik und Strömungsmechanik, Postfach 30 49, 6750 KaiserslauternSearch for more papers by this author Dr.-Ing. Günter Dau, Dr.-Ing. Günter Dau Univ. Kaiserslautern, Lehrstuhl für Mechanische Verfahrenstechnik und Strömungsmechanik, Postfach 30 49, 6750 KaiserslauternSearch for more papers by this authorProf. Dr.-Ing. habil. Fritz Ebert, Prof. Dr.-Ing. habil. Fritz Ebert Univ. Kaiserslautern, Lehrstuhl für Mechanische Verfahrenstechnik und Strömungsmechanik, Postfach 30 49, 6750 KaiserslauternSearch for more papers by this author First published: June 1990 https://doi.org/10.1002/cite.330620617 † Überarbeitete Fassung eines Vortrages von G. Dau auf der Sitzung des GVC-Fachausschusses „Agglomerations- und Schüttguttechnik”︁ am 8./9. Mai 1989 in Friedrichshafen. AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume62, Issue6June 1990Pages 504-505 RelatedInformation

Chemie Ingenieur TechnikVolume 62, Issue 2 p. 156-157 Wissenschaftliche Forschungsarbeit Partikelabscheidung in kleinen Laborzyklonen als Grundlage für Auslegung von großen Betriebszyklonen Dr.-Ing. habil. Helmut Büttner, Dr.-Ing. habil. Helmut Büttner Lehrstuhl für Mechanische Verfahrenstechnik und Strömungsmechanik, Univ. Kaiserslautern, Erwin-Schrödinger-Straße, 6750 KaiserslauternSearch for more papers by this authorProf. Dr.-Ing. habil. Fritz Ebert, Prof. Dr.-Ing. habil. Fritz Ebert Lehrstuhl für Mechanische Verfahrenstechnik und Strömungsmechanik, Univ. Kaiserslautern, Erwin-Schrödinger-Straße, 6750 KaiserslauternSearch for more papers by this author Dr.-Ing. habil. Helmut Büttner, Dr.-Ing. habil. Helmut Büttner Lehrstuhl für Mechanische Verfahrenstechnik und Strömungsmechanik, Univ. Kaiserslautern, Erwin-Schrödinger-Straße, 6750 KaiserslauternSearch for more papers by this authorProf. Dr.-Ing. habil. Fritz Ebert, Prof. Dr.-Ing. habil. Fritz Ebert Lehrstuhl für Mechanische Verfahrenstechnik und Strömungsmechanik, Univ. Kaiserslautern, Erwin-Schrödinger-Straße, 6750 KaiserslauternSearch for more papers by this author First published: February 1990 https://doi.org/10.1002/cite.330620233AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL No abstract is available for this article. Volume62, Issue2February 1990Pages 156-157 RelatedInformation

AbstractThe “nozzle scrubber” is a wet scrubber in which the scrubbing water is dispersed in dust laden gas stream by means of one or more pneumatic nozzle. This scrubber is distinguished by an excellent collection efficiency for submicron dust at an unusually low energy and water consumption. So far, the physical effects affecting the separation cannot be explained by a well‐defined theory. Therefore, it is sensible to investigate the collection efficiency with regard to the mechanisms of inertial impaction, turbulent diffusion and coalescence induced by turbulence. The experimental equipment is of a very simple design. A light scattering device was used to measure the particle distributions. In addition, electron micrographs were analyzed to obtain information about the submicron particles. The influence of operating parameters on grade efficiency has been demonstrated by their systematic variation. The contribution of turbulent diffusion to the collection efficiency has been confirmed; nevertheless, grade efficiencies were also measured when inertial impaction prevailed.

Chemie Ingenieur TechnikVolume 60, Issue 2 p. 122-123 Kurzmitteilungen Experimentelle Untersuchung eines Naßentstaubers† Prof. Dr.-Ing. habil. Fritz Ebert, Prof. Dr.-Ing. habil. Fritz Ebert Univ. Kaiserslautern, Fachbereich Maschinenwesen/Lehrstuhl für Mechanische Verfahrenstechnik und Strömungsmechanik, Postfach 3049, 6750 KaiserslauternSearch for more papers by this authorPriv.-Doz. Dr.-Ing. habil. Helmut Büttner, Priv.-Doz. Dr.-Ing. habil. Helmut Büttner Univ. Kaiserslautern, Fachbereich Maschinenwesen/Lehrstuhl für Mechanische Verfahrenstechnik und Strömungsmechanik, Postfach 3049, 6750 KaiserslauternSearch for more papers by this authorDipl.-Ing. Peter Centner, Dipl.-Ing. Peter Centner Univ. Kaiserslautern, Fachbereich Maschinenwesen/Lehrstuhl für Mechanische Verfahrenstechnik und Strömungsmechanik, Postfach 3049, 6750 KaiserslauternSearch for more papers by this author Prof. Dr.-Ing. habil. Fritz Ebert, Prof. Dr.-Ing. habil. Fritz Ebert Univ. Kaiserslautern, Fachbereich Maschinenwesen/Lehrstuhl für Mechanische Verfahrenstechnik und Strömungsmechanik, Postfach 3049, 6750 KaiserslauternSearch for more papers by this authorPriv.-Doz. Dr.-Ing. habil. Helmut Büttner, Priv.-Doz. Dr.-Ing. habil. Helmut Büttner Univ. Kaiserslautern, Fachbereich Maschinenwesen/Lehrstuhl für Mechanische Verfahrenstechnik und Strömungsmechanik, Postfach 3049, 6750 KaiserslauternSearch for more papers by this authorDipl.-Ing. Peter Centner, Dipl.-Ing. Peter Centner Univ. Kaiserslautern, Fachbereich Maschinenwesen/Lehrstuhl für Mechanische Verfahrenstechnik und Strömungsmechanik, Postfach 3049, 6750 KaiserslauternSearch for more papers by this author First published: February 1988 https://doi.org/10.1002/cite.330600211Citations: 1 † Vortrag von P. Centner auf der GVC-Fachausschußsitzung “Partikelabscheidung – Abgasreinigung” am 18./19. Mai 1987 in Würzburg. AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL No abstract is available for this article.Citing Literature Volume60, Issue2February 1988Pages 122-123 RelatedInformation