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Publication type: Article in scientific journal
Type of review: Peer review (publication)
Title: Ultra low temperature microturbine for magic angle spinning system
Authors: Herzog, Nicoleta
Weber, Alexander Séverin
Purea, Armin
Osen, David
Knott, Benno
Engelke, Frank
Wilhelm, Dirk
et. al: Yes
DOI: 10.1115/1.4053746
Published in: Journal of Fluids Engineering
Volume(Issue): 144
Issue: 8
Pages: 081205-1
Pages to: 081205-12
Issue Date: Aug-2022
Publisher / Ed. Institution: The American Society of Mechanical Engineers
ISSN: 0098-2202
Language: English
Subjects: Nuclear magnetic resonance; Magic angle spinning; Microturbine
Subject (DDC): 620: Engineering
Abstract: We investigate the fluid dynamics of a microturbine system that is applied in a device for chemical and biological analysis—a so-called magic angle spinning (MAS) nuclear magnetic resonance (NMR) probe. The present system is utilized in a wide temperature range from 45K to 293 K. Pressurized air, nitrogen, or helium are used to drive a Pelton type microturbine. This turbine is mounted on a MAS rotor with a diameter between 0.7mm and 3.2 mm. The rotor system is equipped with a pressurized gas bearing that is operated by the same gas species as the turbine. Computational fluid dynamics (CFD) simulations have been performed and compared with fluid dynamics measurements of the MAS system for different diameters, temperatures, and spinning rates between 23 kHz and 120 kHz. To our knowledge, this work is the first comprehensive CFD and experimental study of such a wide temperature range that has been carried out for microturbines with pressurized gas bearings. The results show good agreement between measurements and CFD simulations with appropriate (real) gas models, i.e., the ideal gas model for air at room temperature, Peng–Robinson model for nitrogen at 105 K, and ideal gas model for helium at 45 K.
Fulltext version: Published version
License (according to publishing contract): CC BY 4.0: Attribution 4.0 International
Departement: School of Engineering
Organisational Unit: Institute of Applied Mathematics and Physics (IAMP)
Institute of Energy Systems and Fluid Engineering (IEFE)
Published as part of the ZHAW project: Entwicklung eines Ultra-Low-Temperature NMR Probenkopfes für hochgeschwindigkeits Magic-Angle-Spinning Anwendungen mit Hilfe von Computational Fluid Dynamics (CFD) Simulationen
Appears in collections:Publikationen School of Engineering

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