Arbeiter, Frederik

Klein, Ch.

Klimenko, D.

Pasler, V.

Schlindwein, G.

von der Weth, A.

Fusion Engineering and Design

English

Frederik Arbeiter

Dmitry Klimenko

Christine Klein

Georg Schlindwein

Volker Pasler

Axel von der Weth

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Simulations and pre-experiment uncertainty analyses for a hydrogen diffusion experiment using a “two side purged membrane” setup

Weth, A. von der

KITopen

KIT – The Research University in the Helmholtz AssociationUncertainty estimationAs figure of merit, propagated uncertainties to D and KS are estimated for a simplified analytic evaluation method.(1) 0.16877 ⋅ / ∆ ,     (2) ϕ 	 	 	 ⋅→ ⋅, ,Experimental setpoints can be optimized. For example:large flow rate and/or large membrane thickness: good time resolution but low signal level (and vice versa).1⁄ 	; 0	 ∧ 	0	; 	0	 ∨ 	inoutSimulation methodologySystem response ∗ ⋅Impulse response function is residence time distribution Convolution integral ∗ is numerically solvedFurther model for QMS sampling and noise applied Complete system signal simulation (prediction) implemented .Background and ObjectiveAn experiment “Q-PETE” representative for the situation in the Helium Cooled Pebble Bed breeding zone and suitable for validation of relevant tritium transport codes is planned. In a temperature controlled setup a hydrogen loaded feed gas is directed over a steel membrane into which it can permeate. On the other side of the membrane a sweep gas flow collects the permeated hydrogen and transports it to a gas analysis (QMS) for quantitative time resolved detection.  Methods to handle time resolved permeation experiments with sweep gas, considering the residence time distribution of the sweep gas are introduced. Institute for Neutron Physics and Reactor TechnologyContact: Dr.-Ing. Frederik Arbeiter <f.arbe@kit.edu>Simulations and pre-experiment uncertainty analyses for a hydrogen diffusion experiment using a “two side purged membrane” setupFrederik Arbeiter, D. Klimenko, Ch. Klein, G. Schlindwein, V. Pasler, A. von der WethIssueThe time resolved permate flux signal over the membrane  is of interest for code validation and material parameter (Diffusivity D, Sieverts constant KS) determinationThe purge flow  residence time distribution in the permeate chamber (PSC) and the piping effects a lag and a dispersion in the measurable concentration signal / The difference between and must be described !Schematic flow and instrumentation diagram of Q-PETEQuadrupole MassSpectrometer0	; 	01⁄ 	; 	 0	 ∧ 	 2 3⁄ 	1 1.5 1 0.5 13 0.5 ; 2 3⁄	1 1 1.5	⁄1/2	“QQ“: species with twohydrogen atoms, like D2ArColor code: QQ concentrationGrey: Streamlines(mixture)Sweepgas permeated hydrogenfluxMem-branePermeatechamber(PSC)Flow and concentration field in the purged permeate chamberconvolution integralResidence time distributionscan be obtained by analyticformulae (abstracted cases)or by CFD calculation fora specific geometry andflow boundary conditions.They differ by the effectedsignal dispersion.2.83	„true“ membraneflux signalmeasurable(convoluted)signalmeasurablesignal , sampledwith noise10	 ,1.198 ³⁄12.4	2000	 ,4.459 ³⁄2.83	large signal lag & dispersion !Simulated signals for two experimental conditions: feed gas hydrogen content. : Sweep gas flow ratesignal rise time ∆for both cases 41.2 smoderate signal lag & dispersion !Predicted uncertaintiesdepending on the sweepgas flow rate show an optimum range (in thiscase, ~300 sccm)The residence time distribution in the permeation setupvolume before the analysis station has significant effect andcan be predicted by appropriate methods.Experimental uncertainties of ~ 15% for the derived Sieverts constant for breeder zone typical conditions are expected forthe Q-PETE purged permeation experiments.

Simulations and pre-experiment uncertainty analyses for a hydrogen diffusion experiment using a \u27two side purged membrane\u27 setup

https://publikationen.bibliothek.kit.edu/1000076471/4822442

Simulations and pre-experiment uncertainty analyses for a hydrogen diffusion experiment using a \u27two side purged membrane\u27 setup

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