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contributor authorEnno Wagner
contributor authorPeter Stephan
date accessioned2017-05-09T00:33:32Z
date available2017-05-09T00:33:32Z
date copyrightDecember, 2009
date issued2009
identifier issn0022-1481
identifier otherJHTRAO-27876#121008_1.pdf
identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/140919
description abstractIn a special boiling cell, vapor bubbles are generated at single nucleation sites on top of a 20μm thick stainless steel heating foil. An infrared camera captures the rear side of the heating foil for analyzing the temperature distribution. The bubble shape is recorded through side windows with a high-speed camera. Global measurements were conducted, with the pure fluids FC-84 and FC-3284 and with its binary mixtures of 0.25, 0.5, and 0.75mole fraction. The heat transfer coefficient (HTC) in a binary mixture is less than the HTC in either of the single component fluid alone. Applying the correlation of Schlünder showed good agreement with the measurements (1982, “ Über den Wärmeübergang bei der Blasenverdampfung von Gemischen,” Verfahrenstechnik, 16(9), pp. 692–698). Furthermore, local measurements were arranged with high lateral and temporal resolution for single bubble events. The wall heat flux was computed and analyzed, especially at the three-phase-contact line between liquid, vapor, and heated wall. The bubble volume and the vapor production rate were also investigated. For pure fluids, up to 50–60% of the latent heat flows through the three-phase-contact region. For mixtures, this ratio is clearly reduced and is about 35%.
publisherThe American Society of Mechanical Engineers (ASME)
titleHigh-Resolution Measurements at Nucleate Boiling of Pure FC-84 and FC-3284 and Its Binary Mixtures
typeJournal Paper
journal volume131
journal issue12
journal titleJournal of Heat Transfer
identifier doi10.1115/1.3220143
journal fristpage121008
identifier eissn1528-8943
keywordsTemperature
keywordsFluids
keywordsMeasurement
keywordsBubbles
keywordsBoiling
keywordsMixtures
keywordsHeat flux
keywordsResolution (Optics)
keywordsNucleate boiling
keywordsPressure
keywordsHeating AND Shapes
treeJournal of Heat Transfer:;2009:;volume( 131 ):;issue: 012
contenttypeFulltext


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