Reference : Simulation of gas-dynamic, pressure surges and adiabatic compression phenomena in geo...

	Document type :	Scientific journals : Article
	Discipline(s) :	Engineering, computing & technology : Mechanical engineering
	Focus Areas :	Computational Sciences
	To cite this reference:	http://hdl.handle.net/10993/47067

Title :	Simulation of gas-dynamic, pressure surges and adiabatic compression phenomena in geometrically complex respirator oxygen valves
Language :	English
Author, co-author :	Obeidat, Anas [University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Engineering (DoE) >]
	Andreas, Thomas []
	Bordas, Stéphane [University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Engineering (DoE) >]
	Zilian, Andreas [University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Engineering (DoE) >]
Publication date :	1-Aug-2021
Journal title :	Thermal Science and Engineering Progress
Volume :	24
Peer reviewed :	Yes
Audience :	International
Keywords :	[en] Oxygen valve ; Pressure surges ; Adiabatic compression ; Thermal ; Temperature ; Remesh smoothed particle hydrodynamics ; Brinkman penalisation
Abstract :	[en] Gas-dynamic pressure surges and adiabatic compression phenomena are generally hard to predict numerically. In this contribution, we study the effect of the pressure reserve capacity on the compressible gas-dynamics pressure surge and adiabatic compression in a fitted respirator oxygen valve geometry. A three-dimensional remeshed smoothed particle hydrodynamics method for the simulation of isotropic turbulence is used, the method is coupled with Brinkman penalisation technique for flow simulation inside the complex valve geometry. Simulations are carried out for three different pressure reserve quantities, to replicate the opening of the valve, two time-based pressure inlet boundary condition functions were simulated along with an impulsively started scenario. A geometrical sensitivity analysis is provided, where the simulation is performed on a modified valve design which exhibits a damping effect on the gas dynamics and flow characteristics, which has a favourable effect on the valve functionality and safety. It is found that the capacity of the pressure reserve has a considerable effect on the simulated flow fields (velocity, temperature), as the temperature could rise 6.0X the reference temperature, and up to 2.7X the reference velocity. The numerical results are compared with a previous study carried out by Rotarex S.A., demonstrating that the remeshed particle-mesh method coupled with Brinkman penalisation provides a good quality simulation and the results are in agreement with the reference solution.
Funders :	Fonds National de la Recherche - FnR
Name of the research project :	Simulation of gas-dynamic, pressure surges and adiabatic compression phenomena in complex geometries of gas valves.
Target :	Researchers ; Professionals
Permalink :	http://hdl.handle.net/10993/47067
DOI :	10.1016/j.tsep.2021.100906
Other URL :	https://www.sciencedirect.com/science/article/pii/S2451904921000688?via%3Dihub

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