000003466 001__ 3466
000003466 005__ 20141118153358.0
000003466 04107 $$acze
000003466 046__ $$k2006-05-15
000003466 100__ $$aHrubý, J.
000003466 24500 $$aTransient temperature field in the chamber for measurement of surface tension of supercooled liquids

000003466 24630 $$n12.$$pENGINEERING MECHANICS 2006
000003466 260__ $$bInstitute of Theoretical and Applied Mechanics, AS CR, v.v.i., Prague
000003466 506__ $$arestricted
000003466 520__ $$2eng$$aWe present results of mathematical modeling of the transient temperature field in a new chamber developed to measure surface tension of supercooled liquids, and results of auxiliary measurements. The chamber is designed to enable a very fast (within 0.1 s) formation of a homogeneous temperature field (within 0.02 K) after a temperature jump of 60 K. The interior of the chamber of dimensions 20x16x32 mm is filled with dry nitrogen surrounding the measuring capillary and thermometers (very fine thermocouples and RTD’s). The temperature jump is generated by switching the flow direction of the nitrogen serving as a heat transmitting fluid. To reduce the thermal boundary layer near the bottom and ceiling walls, they are made permeable and some gas is sucked out. The flow in the chamber is laminar. We compute the temperature field analytically and numerically, using the commercial software Fluent. The analytical solution results in a series of goniometric and confluent hyperbolic functions. The Fluent code has been adapted to accept special boundary conditions for the velocity and temperature fields at the permeable walls. The results indicate that the design objectives of the experimental device were met.

000003466 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000003466 653__ $$a

000003466 7112_ $$aENGINEERING MECHANICS 2006$$cSvratka (CZ)$$d2006-05-15 / 2006-05-18$$gEM2006
000003466 720__ $$aHrubý, J.$$iMareš, R.$$iRichtr, K.$$iMüller, M.
000003466 8560_ $$ffischerc@itam.cas.cz
000003466 8564_ $$s389399$$uhttps://invenio.itam.cas.cz/record/3466/files/Hruby-290-PT.pdf$$y
             Original version of the author's contribution as presented on CD, , paper No. 290.
            
000003466 962__ $$r3410
000003466 980__ $$aPAPER