FG Fluidsystemdynamik - Strömungstechnik in Maschinen und Anlagen

11 Items

Recent Submissions
Heat metering with glycol-water-mixtures

Baack, Sebastian (2020)

Due to its physical properties, glycol-water-mixtures cause typical heat meters to measure with increased deviations. Both the volume flow measurement and the fluid’s heat coefficient are affected. For the determination of the exchanged energy, for example in cooling or solar thermal installations, heat meters which are suitable for commonly used glycol-based heat conveying media are necessary....

Data Mining to Uncover Heterogeneous Water Use Behaviors From Smart Meter Data

Cominola, Andrea ; Nguyen, K. ; Giuliani, Matteo ; Stewart, Rodney A. ; Maier, Holger R. ; Castelletti, Andrea (2019-11-19)

Knowledge on the determinants and patterns of water demand for different consumers supports the design of customized demand management strategies. Smart meters coupled with big data analytics tools create a unique opportunity to support such strategies. Yet, at present, the information content of smart meter data is not fully mined and usually needs to be complemented with water fixture invento...

Causes, effects and solutions of operational problems in wastewater systems due to nonwoven wet wipes

Mitchell, Raja-Louisa (2019)

Operational problems due to sewer system incompatible nonwoven wipes in wastewater systems affect nearly all wastewater system operators in regions where nonwoven wipes are used as convenience products. They disrupt the operation of the critical infrastructure, cause equipment failures, and large additional expenditures. To date, however, there is no agreement as to which nonwoven wet wipes are...

Kennliniencharakteristik von Diagonalventilatoren mit modifizierter Meridiankontur

Treder, Anne (2018)

Die Durchströmungsrichtung im Laufrad klassifiziert Ventilatoren in die axiale, diagonale und radiale Bauform. Axial- und Radialventilatoren sind in einer Vielzahl unterschiedlicher Formen auf dem Markt vertreten. Für große Volumenströme sind Axialventilatoren bevorzugt einzusetzen, Radialventilatoren sind hingegen für große erforderliche Druckerhöhungen geeignet. Wenn die Anforderungen an den ...

The influence of impeller designs on the performance of a vortex pump

Gerlach, Angela (2018)

Vortex pumps are particularly suitable for the transportation of solids-containing fluids. Hence, vortex pumps are applied to a wide range of operation domains, from wastewater transport to food processing. Characteristics of vortex pumps are their recessed, semi-open impeller and their enlarged gap between the impeller and the casing. These features strongly reduce the risk of clogging compare...

Simulation-based determination of systematic errors of flow meters due to uncertain inflow conditions

Weissenbrunner, Andreas ; Fiebach, André ; Schmelter, Sonja ; Bär, Markus ; Thamsen, Paul Uwe ; Lederer, Thomas (2016-12)

Computational fluid dynamics (CFD) provides well-established tools for the prediction of the velocity profiles in turbulent pipe flows. As far as industrial pipe and district heating systems are concerned, combinations of elbows are the most common pipe assemblies. Among the different pipe combinations, double elbows out-of-plane are of special interest, since they introduce strong disturbances...

Uncertainty evaluation for velocity–area methods

Steinbock, Jonas ; Weissenbrunner, Andreas ; Juling, Markus ; Lederer, Thomas ; Thamsen, Paul Uwe (2016-02)

Velocity–area methods are used for flow rate calculation in various industries. Applied within a fully turbulent flow regime, modest uncertainties can be expected. If the flow profile cannot be described as “log-like”, the recommended measurement positions and integration techniques exhibit larger errors. To reduce these errors, an adapted measurement scheme is proposed. The velocity field insi...

Kreiselpumpe mit horizontalem Leistungsverlauf über dem Volumenstrom

Beck, Marcus Klaus (2018-03)

In der Doktorarbeit wurde der neuartige Ansatz verfolgt, eine Kreiselpumpe kleiner Baugröße mit einer Hydraulik zu entwickeln, welche bei Veränderung des Volumenstromes die Leistungsaufnahme der Pumpe konstant hält, so dass sich ein horizontaler Verlauf der elektrischen Leistungskennlinie über den gesamten Volumenstrombereich ergibt. Eine flache Leistungskurve ist für kleine Maschinen interessa...

Design Parameters of Vortex Pumps: A Meta-Analysis of Experimental Studies

Gerlach, Angela ; Thamsen, Paul Uwe ; Wulff, Sebastian ; Brix Jacobsen, Christian (2017)

Vortex pumps can impel solid-containing fluids and are therefore widely applied, from wastewater transport to the food industry. Despite constant efforts to improve vortex pumps, however, they have remained relatively inefficient compared to conventional centrifugal pumps. To find an optimized design of vortex pumps, this paper provides a systematic analysis on experimental studies that investi...

Aufbau und Validierung eines laseroptischen Normal-Durchfluss-Messgeräts für die metrologische Rückführung einer Hochtemperatur-Prüfanlage

Steinbock, Jonas Johannes (2017)

Die klassischen gravimetrischen oder volumetrischen Methoden zur Kalibrierung von Durchflussmessgeräten sind aufgrund ihrer drucklosen Ausführung in ihrer Anwendung für das Medium Wasser auf Temperaturen unter 100 °C beschränkt. Eine Kalibrierung unter Prozessbedingungen ist daher zum Beispiel für Anwendungen in der Kraftwerkstechnik nicht möglich. Zur Ausweitung des metrologisch abgesicherten ...

A hydrodynamically optimized nano-electrospray ionization source and vacuum interface

Pauly, M. ; Sroka, M. ; Reiss, J. ; Rinke, G. ; Albarghash, A. ; Vogelgesang, R. ; Hahne, H. ; Kuster, B. ; Sesterhenn, J. ; Kern, K. ; Rauschenbach, S. (2014)

The coupling of atmospheric pressure ionization (API) sources like electrospray ionization (ESI) to vacuum based applications like mass spectrometry (MS) or ion beam deposition (IBD) is done by differential pumping, starting with a capillary or pinhole inlet. Because of its low ion transfer efficiency the inlet represents a major bottleneck for these applications. Here we present a nano-ESI vac...