Intensification of heat transfer between heat exchange surfaces at low RE values

• Autorzy: Cernecky J. , Brodnianska Z. , Koniar J.

Identyfikatory

DOI

10.1515/cpe-2015-0023

• Języki publikacji: EN

Abstrakty

EN

This contribution deals with the heat transfer parameters and pressure losses in heat exchange sets with six geometrical arrangements at low Re values (Re from 476 to 2926). Geometrical arrangements were characterised by the h/H ratio ranging from 0.2 to 1.0. The experiments used the holographic interferometry method in real time. This method enables visible and quantitative evaluations of images of temperature fields in the examined heat exchange. These images are used to determine the local and mean heat transfer parameters. The obtained data were used to determine the Colburn j-factor and the friction coefficient f. The measured values show that by using the profiled heat exchange surfaces and inserting regulating tubes, an intensification of heat transfer (increase of Num, and/or j) was achieved. However, pressure losses recorded a significant increase (increase of f).

Słowa kluczowe

EN

heat transfer; heat exchange surface; Colburn j-factor; interferometry

PL

przenikanie ciepła; powierzchnia wymiany ciepła; interferometria

• Wydawca: Komitet Inżynierii Chemicznej i Procesowej Polskiej Akademii Nauk
• Czasopismo: Chemical and Process Engineering
• Rocznik: 2015
• Tom: Vol. 36, nr 3
• Strony: 331--344
• Opis fizyczny: Bibliogr. 23 poz., rys., tab.

Twórcy

autor

Cernecky J.

• Technical University in Zvolen, Faculty of Environmental and Manufacturing Technology, Department of Environmental and Technology, Studentska 26, 960 53 Zvolen, Slovakia

autor

Brodnianska Z.

• Technical University in Zvolen, Faculty of Environmental and Manufacturing Technology, Department of Environmental and Technology, Studentska 26, 960 53 Zvolen, Slovakia

autor

Koniar J.

• Technical University in Zvolen, Faculty of Environmental and Manufacturing Technology, Department of Environmental and Technology, Studentska 26, 960 53 Zvolen, Slovakia

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