1,721,353 research outputs found
Humidity measurements in passive heat and moisture exchangers applications: a critical issue
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Ottimizzazione emodinamica di un trattamento chirurgico di patologie cardiache congenite
No full textVirtual bench testing to study coronary bifurcation stenting
Full text linkVirtual bench testing is a numerical methodology which has been applied to the study of coronary interventions. It exploits the amazing growth of computer performance for scientific calculation and makes it possible to simulate very different and complex multiphysics environments and processes, including coronary bifurcation stenting. The quality of prediction from any computer model is very sensitive to the quality of the input data and assumptions. This also holds true in stent virtual bench testing. This paper reviews the state of the art in the field of bifurcation stenting modelling and identifies the current advantages and limitations of this methodology
Combined computational study of mechanical and transport behavior of a porous hydroxyapatite-based ceramic biomaterial
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Computational modeling of passive furrowed channel micromixers for lab-on-a-chip applications
Full text linkBackground: Effective micromixers represent essential components for micro total analysis systems or lab-on-a-chip. Indeed,
mixing is a key process for the success of all chemical or biochemical reactions. Most microfluidic systems operate in a laminar
flow regime dominated by molecular diffusion, which is not favorable to mixing. In the present work, numerical analyses
of mixing in 3-dimensional channels with obstacles on the walls were performed to investigate mixing behavior and flow
characteristics with geometric parameters as well as Reynolds number.
Methods: Several channel wall geometries were numerically modeled, and the influence of obstacle height, phase shift between
the walls, channel cross-section shape (aspect ratio) and Reynolds number on mixer performances was investigated.
Wall geometries were evaluated comparatively in terms of index of mixing and pressure drops caused.
Results: Results indicated that furrowed channels with proper triangle-shaped obstacles show good performances in terms
of achieving complete mixing in a very short length of channel, and at the same time offer low pressure losses. Convective
motions are the main influences responsible for successful mixing, and micromixers with triangle-shaped obstacles show an
improvement in the mixing performances for increasing Reynolds numbers. Moreover, short times are required for the mixing
process. Finally, depending on the Reynolds number that one works at, there is also some flexibility in the choice of the
channel geometry, as the occurrence of effective chaotic advection was obtained for several conformations of the channels
proposed in this study.
Conclusions: Mixing enhancement can be achieved by optimizing the shape of the furrowed channel
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