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A study of heat transfer from cylinders in turbulent flows by using thermochromic liquid crystals

<p>In gas quenching, metal parts are rapidly cooled from hightemperatures, and the convection heat transfer coefficientdistributions are of importance for the hardness and thedistortion (the shape nonuniformities) of the quenched parts.Thermochromic liquid crystals (TLC) and a thin foil techniques,were investi- gated and used for studies of a circular cylinderin axial flows, affected and not affected by upstream owmodifying inserts. Quadratic prisms in cross ows were alsostudied, a single prism, two prisms arranged in-line, and forfour prisms arranged in a square pattern. In this study,particle image velocime- try (PIV) was used for visualizationof the flow, giving physical insight to the convection heattransfer data. Further, relations of the type<i>Nu</i>=<i>CRe</i><i>e</i>were established. The TLC and thin foil techniques werealso used to indicate the dimensions of separated flowregions.</p><p><b>Descriptors:</b>Fluid mechanics, wind-tunnel, turbulence,gas quenching, con- vection heat transfer, thermochromic liquidcrystals, calibration, temperature measurement errors, thinfoils, particle image velocimetry, cylinder in axial flow, flowmodifying inserts, quadratic prisms in cross flow</p>

Identiferoai:union.ndltd.org:UPSALLA/oai:DiVA.org:kth-1695
Date January 2004
CreatorsWiberg, Roland
PublisherKTH, Mechanics, Stockholm : Mekanik
Source SetsDiVA Archive at Upsalla University
LanguageEnglish
Detected LanguageEnglish
TypeLicentiate thesis, comprehensive summary, text
RelationTrita-MEK, 0348-467X ; 2004:01

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