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

• Authors: Jozef Cernecky , Zuzana Brodnianska , Jan Koniar
• Languages of publication: EN

Abstracts

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).

Keywords

EN

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

• Publisher: De Gruyter Open
• Journal: Chemical and Process Engineering
• Year: 2015
• Volume: 36
• Issue: 3
• Pages: 331-344

Dates

published

1 - 9 - 2015

received

18 - 7 - 2014

accepted

25 - 7 - 2015

online

5 - 11 - 2015

revised

5 - 5 - 2015

Contributors

author

Jozef Cernecky

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

author

Zuzana Brodnianska

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

author

Jan Koniar

• 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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Identifiers

DOI

10.1515/cpe-2015-0023