000015966 001__ 15966
000015966 005__ 20161115135334.0
000015966 04107 $$aeng
000015966 046__ $$k2013-06-12
000015966 100__ $$aHollweg, F-R.
000015966 24500 $$aNumerical Analysis About the Influence of Inappropriate Shape of the Cross-Section of Microchannels in Laminar Flow

000015966 24630 $$n34.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000015966 260__ $$bNational Technical University of Athens, 2013
000015966 506__ $$arestricted
000015966 520__ $$2eng$$aIn the past decades, several experimental investigations performed to the hydrodynamics and heat transfer in microscale laminar flow have showed divergences to the Darcy friction factor and the Poiseuille and Nusselt numbers, when the results obtained for the same ones were compared to those provided by classical theory. There are reports of deviations to the Darcy friction factor and the Poiseuille and Nusselt numbers attributed to geometric imperfections at the cross-section of the microchannels. The aim of this numerical study is to analyze how the hydrodynamic and heat transfer characteristics in single-phase laminar flow, of a fluid with constant thermophysical properties, can be affected by imperfections at the cross-section of the microchannels. The results obtained for single-phase laminar flow of water in microchannels with imperfections at the cross-section are compared to those obtained for a geometrically perfect microchannel through Poiseuille and Nusselt numbers. Deviations at Poiseuille and Nusselt numbers due to imperfections at the cross-section of the microchannels were verified. The results showed that Nusselt number is more sensitive to shape of the cross-section of the microchannels than Poiseuille number. This study showed that knowledge about the geometrical shape of the cross-section of the microchannels is important to determine properly the hydrodynamic parameters of the flow, such as Poiseuille number. This study was carried out through computational fluid dynamics (CFD) and the numerical model made up by mass conservation, Navier-Stokes and energy equations.

000015966 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000015966 653__ $$amicrochannels, Poiseuille, Nusselt, CFD.

000015966 7112_ $$aCOMPDYN 2013 - 4th International Thematic Conference$$cIsland of Kos (GR)$$d2013-06-12 / 2013-06-14$$gCOMPDYN2013
000015966 720__ $$aHollweg, F-R.$$iOliveski, R-C.$$iDalla Corte, M.
000015966 8560_ $$ffischerc@itam.cas.cz
000015966 8564_ $$s1042455$$uhttps://invenio.itam.cas.cz/record/15966/files/2028.pdf$$yOriginal version of the author's contribution as presented on CD, section: SC-RS 04 COMPUTATIONAL NANOSCIENCE AND NANOTECHNOLOGY
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000015966 962__ $$r15525
000015966 980__ $$aPAPER