NIPPERT

GERMANY (see also List of Individuals)

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28.10.1894 Essen/D - 5.8.1963 Mannheim/D

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Hans Nippert graduated as a mechanical engineer from the Technical University of Danzig in 1921. He moved then to the Imperial shipyard in Wilhelmshaven and later to Krupp machinery in Essen. Nippert then collaborated with Hermann Föttinger (1877-1945) at Danzig University where he submitted a PhD thesis in 1927. Nippert returned from 1927 to 1929 to Krupp again in Kiel and then moved as a technical director to Maschinenfabrik Ahlborn in Hildesheim. After World War II, Nippert joined the Enzinger-Union-Werke in Mannheim. He was from 1950 a Member of Schiffbautechnische Gesellschaft STG.

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Nippert is known for some research works elaborated during and shortly after his dissertation was published. These works relate to the flow structure in channel bends, which he investigated both based on the oil film technique and hydraulically by measuring pressure losses across this hydraulic element. Nippert is one of the first that observed with his technique the secondary currents across curves, which may be described with a twin vortex about the axis of symmetry. The flow in the channel center with a relatively high velocity has a radial velocity component away from the center of curvature, whereas slower fluid moves radially towards its center along the channel walls. Nippert also investigated the pressure distribution along a curve, and observed a low pressure zone along the inner wall and a high pressure zone along the outer wall. The minimum pressure may become so low that cavitation occurs. Along with these findings, Nippert documented his results with long-exposure photographs demonstrating secondary flow zones with a special technique employed. His 1930 paper is a general account of head losses in pipe flow because of fluid viscosity. After 1930, no hydraulic research papers of Nippert were located.

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_{Anonymous (1963). Hans Nippert. Jahrbuch Schiffbautechnische Gesellschaft 57: 61-62.}

_{Nippert, H. (1929). Über Strömungsverluste in gekrümmten Kanälen. Forschungsarbeiten auf dem Gebiete des Ingenieurwesens 320. VDI-Verlag: Berlin; also Zeitschrift VDI 73(39): 1391-1392.}

_{Nippert, H. (1930). Neuere Versuche über den Strömungsvorgang in gekrümmten Kanälen. Der Bauingenieur 11(5): 76-79.}

_{Nippert, H. (1930). Ursachen der Strömungsverluste in Rohren. Die Röhrenindustrie 23(25): 377-379; 23(26): 389.}

_{Segall-Nippert, I. (2006). Hans Nippert. Personal communication. P}