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Digitale Medien

Investigation of flow and heat transfer in corrugated-undulated plate heat exchangers (2000)

Ciofalo, M. ; Di Piazza, I. ; Stasiek, J. A.

Springer

Heat and mass transfer 36 (2000), S. 449-462

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ISSN: 1432-1181

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau , Physik

Notizen: Abstract An experimental and numerical investigation of heat transfer and fluid flow was conducted for corrugated-undulated plate heat exchanger configurations under transitional and weakly turbulent conditions. For a given geometry of the corrugated plates the geometrical characteristics of the undulated plates, the angle formed by the latter with the main flow direction, and the Reynolds number were made to vary. Distributions of the local heat transfer coefficient were obtained by using liquid-crystal thermography, and surface-averaged values were computed; friction coefficients were measured by wall pressure tappings. Overall heat transfer and pressure drop correlations were derived. Three-dimensional numerical simulations were conducted by a finite-volume method using a low-Reynolds number k–ɛ model under the assumption of fully developed flow. Computed flow fields provided otherwise inaccessible information on the flow patterns and the mechanisms of heat transfer enhancement.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/s002310000106

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Digitale Medien

Experimental and theoretical study on the radiation of gases containing dust particles (1993)

Stasiek, J. A. ; Collins, M. W.

Springer

Heat and mass transfer 28 (1993), S. 185-193

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ISSN: 1432-1181

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau , Physik

Beschreibung / Inhaltsverzeichnis: Zusammenfassung Es wird die Abschwächung thermischer Strahlung in einer verdünnten Wolke aus pulverisierter Kohle und Asche experimentell und theoretisch für verschiedene Bereiche der Partikelgröße untersucht. Zur Bestimmung des Absorptions- und Emissionsvermögens einer Kohle/Asche-Wolke wird ein empirisch gefundener Ausdruck entwickelt, der außerdem Grundlage eines neuen Nomogramms ist.

Notizen: Abstract The attenuation of thermal radiation within a dilute cloud of pulverised coal and ash is investigated experimentally and theoretically, for different ranges of particle size. An empirical expression is developed for obtaining the absorptivity and emissivity of a coal/ash cloud. A new nomogram is also presented on the basis of this expression.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01541189

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