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2015 | 36 | 3 | 331-344
Article title

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

Content
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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).
Publisher

Year
Volume
36
Issue
3
Pages
331-344
Physical description
Dates
published
1 - 9 - 2015
received
18 - 7 - 2014
accepted
25 - 7 - 2015
online
5 - 11 - 2015
revised
5 - 5 - 2015
Contributors
  • Technical University in Zvolen, Faculty of Environmental and Manufacturing Technology, Department of Environmental and Technology, Studentska 26, 960 53 Zvolen, Slovakia, cernecky@tuzvo.sk
  • Technical University in Zvolen, Faculty of Environmental and Manufacturing Technology, Department of Environmental and Technology, Studentska 26, 960 53 Zvolen, Slovakia
author
  • Technical University in Zvolen, Faculty of Environmental and Manufacturing Technology, Department of Environmental and Technology, Studentska 26, 960 53 Zvolen, Slovakia
References
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.-psjd-doi-10_1515_cpe-2015-0023
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