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Hydrodynamic processes at the water-sediment interface of streambeds

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Book Series: Dissertationsreihe am Institut für Hydromechanik der Universität Karlsruhe / Universität Karlsruhe (TH), Institut für Hydromechanik ISSN: 14394111 ISBN: 9783866442443 Year: Volume: 2008/1 Pages: IV, 153 p. DOI: 10.5445/KSP/1000008267 Language: GERMAN
Publisher: KIT Scientific Publishing
Subject: General and Civil Engineering
Added to DOAB on : 2019-07-30 20:02:00
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Simultaneous 2D pressure and 2D velocity information at the rough water-sediment interface of streambeds were gained by a newly developed measurement setup. In the bed the pressure fluctuations decay exponentially within the first 1-2 equivalent sand roughnesses. Structural findings concerning coherent flow structures are consistent with models originally developed for smooth walls. A significant bed destabilizing flow-pressure pattern was identified for the first time.

Untersuchung zum effizienten Betrieb von Hydraulikzylindern in Konstantdrucksystemen unter Verwendung einer Zwischendruckleitung

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Book Series: Karlsruher Schriftenreihe Fahrzeugsystemtechnik / Institut für Fahrzeugsystemtechnik ISSN: 18696058 ISBN: 9783731502951 Year: Volume: 28 Pages: XXI, 161 p. DOI: 10.5445/KSP/1000043836 Language: GERMAN
Publisher: KIT Scientific Publishing
Subject: Technology (General)
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A constant pressure system with discrete pressure potentials is investigated for efficient actuation of hydraulic cylinders. These pressure potentials are created using an intermediate pressure line. Two switch valves can combine high- intermediate- and tank pressure in order to enable multiple pressure potentials at the controlling porportional valve.

High accuracy determination of skin friction differences in an air channel flow based on pressure drop measurements

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Book Series: Schriftenreihe des Instituts für Strömungsmechanik, Karlsruher Institut für Technologie ISSN: 21998868 ISBN: 9783731505020 Year: Volume: 2 Pages: VIII, 222 p. DOI: 10.5445/KSP/1000053260 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:01:58
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The present work delivers a versatile, accurate and reliable wind tunnel facility that is particularly developed to test different flow control techniques for drag reduction in precisely adjustable test conditions. Skin friction changes of 0.4% are resolved, which is comparable to the most accurate reported studies in liquids. this high accuracy is verified through a comprehensive uncertainty analysis. Subsequently, various passive and active flow control strategies are investigated.

Energieeffizienz von Konstantdrucksystemen mit sekundärgeregelten Antrieben beim Einsatz in mobilen Arbeitsmaschinen

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Book Series: Karlsruher Schriftenreihe Fahrzeugsystemtechnik / Institut für Fahrzeugsystemtechnik ISSN: 18696058 ISBN: 9783731503774 Year: Volume: 35 Pages: XXV, 163 p. DOI: 10.5445/KSP/1000047003 Language: GERMAN
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:01:59
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Within this work, it is investigated under which conditions constant pressure systems with secondary controlled drives may be an energetic efficient and cost effective alternative to established mobile hydraulic circuit configurations. For this purpose, a methodology is introduced to evaluate chances and risks at employment of this technology in mobile machines. A demonstrator with three secondary controlled variable displacement drives is developed to confirm the results of the methodology.

Investigation of flow and pressure characteristics around pyramidal buildings

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Book Series: Dissertationsreihe am Institut für Hydromechanik der Universität Karlsruhe (TH) ISSN: 14394111 ISBN: 3937300724 Year: Volume: 2005,3 Pages: XVI, 138 p. DOI: 10.5445/KSP/1000003455 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: General and Civil Engineering
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Pyramidal buildings are undergoing a renaissance in todays architectural design due to their attractive mystery that has fascinated many architects. From an aerodynamic engineering point of view, structural buildings with the shape of a pyramid have their own interesting and particular aerodynamic characteristics as compared to other usual structural buildings (i.e. cuboidal).However, despite its distinct aerodynamic characteristics compared to other usual structural buildings, the flow and pressure characteristics around pyramidal structures have not yet been investigated completely. Very limited studies about pyramidal buildings can be found in the literature.Consequently, the technical layout with respect to wind load assumption of pyramidal buildings are usually not listed in standard tables which underlines the need of systematic investigations for pyramidal structures.In this study, pyramids with a wide range of base angle variation (theta = 30°, 40°, 45°, 50°, 55°, 60°, 70°) have been investigated intensively through a detailed and accurate laboratory experiments at the Laboratory of Building- and Environmental Aerodynamics, Institute for Hydromechanics, at the University of Karlsruhe. The flow measurements were performed using a 2-D Laser Doppler anemometry (LDA) and The pressure measurements were carried out using a standard pressure tapping technique. The present study focuses on the most important parameters affecting the flow and pressure characteristics that include the influence of base angles, the influence of wind directions and the influence of the pyramid heights with respect to a characteristic length. Besides the experimental investigations, numerical investigations with the aid of a software package called FLOVENT were also additionally performed in order to prove, whether experimental and numerical studies deliver the same results.Based on the flow measurement results, this study was able to distinguish the general characteristics of flow around pyramid building when compared to other type of structures (i.e. cuboidal structure). A set of equations to calculate the reattachment length at the leeward side of the pyramid was generated. In addition, an equation to estimate the zero streamline and an area below line as a function of the reattachment length and base angle, respectively, are proposed. These equations will illustrate the recirculation zone at the leeward side of the pyramid.The pressure measurement results show that the three investigated parameters (base angle, wind direction and pyramid height) have an important influence to the pressure characteristics (magnitude of pressure, suction and fluctuation) in the surfaces of the pyramids. For practical purposes, this study was able to provide the typical values of pressure and aerodynamic coefficients for pyramidal buildings that can be used for structural calculations. The values that are given in this study can be used to fill in the gap of the unavailable design values for pyramidal buildings in standard tables.

Metallmatrixverbunde mit Verstärkungselementen aus metallischem Glas Ni??Nb??Ta?? – Herstellung und Charakterisierung

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Book Series: Schriftenreihe des Instituts für Angewandte Materialien, Karlsruher Institut für Technologie ISSN: 21929963 ISBN: 9783731507826 Year: Volume: 75 Pages: XVI, 402 p. DOI: 10.5445/KSP/1000081432 Language: GERMAN
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-28 18:37:01
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Abstract

AlSi12-based metal matrix composites using metallic glass Ni??Nb??Ta?? as reinforcement were produced via gas pressure melt infiltration technique. Comprehensive investigations were performed to determine the composite´s microstructural, mechanical and thermal properties as well as damage mechanisms. The results contribute to a better understanding on the material´s processing-structure-property relations.

Bestimmung zeitabhängiger Blutdruckfelder aus Strömungsdaten der Magnetresonanztomographie

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ISBN: 9783731503354 Year: Pages: VII, 208 p. DOI: 10.5445/KSP/1000045315 Language: GERMAN
Publisher: KIT Scientific Publishing
Subject: Computer Science
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In cardiovascular diagnostics, blood pressure computation from flow data acquired by magnetic resonance imaging is considered promising. Accordingly, this work describes a method for the computation of complete spatiotemporal blood pressure fields in the human aorta. Key issues are the robust pressure computation from noisy input data, the application of regularized blood flow models, the combination of spatial and temporal blood pressure information, and the experimental evaluation.

Modellierung der Stoffübertragung beim Niederdruckcarbonitrieren mit Ammoniak und Acetylen

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Book Series: Schriftenreihe des Instituts für Angewandte Materialien, Karlsruher Institut für Technologie ISSN: 21929963 ISBN: 9783731505686 Year: Volume: 63 Pages: XXVIII, 159 p. DOI: 10.5445/KSP/1000057840 Language: GERMAN
Publisher: KIT Scientific Publishing
Subject: Technology (General)
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A mathematical model has been developed for the description of the transport process for low-pressure carbonitriding with ammonia and acetylene. As an example the case hardening steel 18CrNi8 was used. It can be shown that the concentration profiles of carbon and nitrogen as well as the ammonia exhaust gas concentration are described well. Based on the modelling, first simulation runs could be carried out for further optimization of the heat treatment process.

Entwicklung eines druckgetriebenen dynamischen Kolonnenmodells zur Erhöhung der Flexibilität von kryogenen Luftzerlegungsanlagen

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ISBN: 9783731507604 Year: Pages: VIII, 175 p. DOI: 10.5445/KSP/1000080378 Language: GERMAN
Publisher: KIT Scientific Publishing
Subject: Technology (General)
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Driven by market signals, energy consumers are motivated to adapt their grid load. Due to their cryogenic storage capacity, air separation units can efficiently be used for load shifting. Such an operation leads to new challenges for plant operation and control. The developed pressure-driven dynamic column model is used to investigate load-flexible operation.

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