Fluid Dynamics
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04 Jan

Posted at 16:30h in Biomedical and Biological Flows, Computation Fluid Dynamics, Fluid Dynamics, Measurement and Data Science by
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This study introduces a novel wall shear stress (WSS) estimation method for 4D flow MRI. The method improves the WSS accuracy by using the reconstructed pressure gradient and the flow-physics constraints to correct velocity gradient estimation. The method was tested on synthetic 4D flow data...

04 Jan

Posted at 15:24h in Fluid Dynamics, Measurement and Data Science by
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This work introduces a method to estimate the uncertainty of the pressure fields reconstructed from particle image velocimetry / particle tracking velocimetry (PIV/PTV) measurements by propagating the instantaneous velocity vector uncertainty through the pressure reconstruction. The uncertainty propagations through the calculation and integration of pressure...

19 Dec

Posted at 00:03h in Biomedical and Biological Flows, Biomedical Device, Fluid Dynamics by
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Interface motion and hydrodynamic shear of the liquid slosh during the insertion of syringes upon autoinjector (AI) activation may damage the protein drug molecules. We experimentally investigate the interfacial motion and hydrodynamic shear due to the acceleration and deceleration of syringes. No study to date...

18 Dec

Posted at 17:46h in Biomedical Device, Fluid Dynamics, Measurement and Data Science by
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Pharmaceutical industry focuses on developing prefilled syringe and autoinjector (AI) products by expanding features and capabilities. However, most of them might not be aware of an undesired phenomenon that may occur during drug solution injection called cavitation collapse. Cavitation is a phenomenon in which rapid...

27 Jan

Posted at 16:41h in Biomedical and Biological Flows, Fluid Dynamics, Measurement and Data Science by
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4D flow magnetic resonance imaging (MRI) allows for the in vivo acquisition of time-resolved three-dimensional (3D) blood flow, enabling the evaluation of hemodynamic quantities for cerebral aneurysms (CAs). However, the accuracy of flow-derived hemodynamic quantities such as pressure and wall shear stress (WSS) is affected...

22 Sep

Posted at 11:25h in Biomedical and Biological Flows, Fluid Dynamics by
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Silicone Sylgard 184 (PDMS) is commonly used when manufacturing geometries for bioflow studies due to its optical transparency and compliant nature. However, for use with particle image velocimetry (PIV), a suitable blood analog working fluid is needed which both matches the physical properties of blood...

14 Sep

Posted at 15:57h in Biomedical and Biological Flows, Fluid Dynamics, Measurement and Data Science by
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4D flow magnetic resonance imaging (MRI) allows for in vivo acquisition of time-resolved three-dimensional (3D) blood flow, thus enabling quantitative analysis of volumetric, time-varying hemodynamic quantities such as flow rates, wall shear stress (WSS), pressure difference, etc. 4D flow MRI is based on the phase...

30 Apr

Posted at 07:49h in Fluid Dynamics, Measurement and Data Science by
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The uncertainty in a planar PIV measurement has been a topic of great interest in the last decade. Here, we present a new direct uncertainty estimation method for Particle Image Velocimetry (PIV), that uses the correlation plane as a model for the probability density function...