“利用吸收光谱和计算流体动力学测定细长空腔内的蒸汽量” （英文版）.pdf

1、Determination of the steam amount insidelong,fine cavities using absorption spectroscopy and computational fluid dynamicsName:Simon PletzerCo-authors:Benjamin Lang,Marco Miranda,Alexander Bergmann,and Christoph HochenauerAffiliation:Technical University of Graz&W&H Sterilization1OverviewI.Background

2、II.MethodsAbsorption spectroscopy Computational fluid dynamicsIII.Steam penetration in thin-walled channelsGeometry pipeResults original 134 C sterilization cycleResults adapted 134 C sterilization cycleIV.Steam penetration in hollow devicesGeometry simplified MDResults V.Conclusion2Backgrounddead-e

3、nded pipeairsteam Steam penetration into lumen is still not fully understoodInfluence of the geometry and material of the MD(medical device)Influence of condensation&re-evaporation on the steam penetration behaviorInfluence of the sterilization cycle(pressure curve)Monitoring currently based on CIs/

4、BIsFeedback only after cycle completionNo precise quantitative data New method needed Aim:improve fundamental understandingOptimize sterilization cyclesSupport manufactures with MD designs 3Absorption spectroscopy Water vapor interacts with light at specific wavelengthsAbsorption occurs Intensity is

5、 reduced(1 0)As light source a tunable laser diode was usedat a wavelength of 1364 nmwavelength tuned(changed)by current and temperaturePhotodetector measures the reduced light intensity Gas cellH2Omolecules01DetectorAirmoleculesLaser4Computational fluid dynamicsWhy we use CFD in addition to experim

6、entsExperiment provides real data but only at a few pointsCFD Information of the entire domain Possible to investigate complex geometriesdead-ended pipeExperiment validates CFDTogether:Spectroscopy data ensures CFD is reliableWhat is CFD:Powerful tool to simulate the fluid flow(liquids&gases)of real