- Tytuł:
- Intensification of heat transfer between heat exchange surfaces at low RE values
- Autorzy:
-
Cernecky, J.
Brodnianska, Z.
Koniar, J. - Powiązania:
- https://bibliotekanauki.pl/articles/184897.pdf
- Data publikacji:
- 2015
- Wydawca:
- Polska Akademia Nauk. Czytelnia Czasopism PAN
- Tematy:
-
heat transfer
heat exchange surface
Colburn j-factor
interferometry
przenikanie ciepła
powierzchnia wymiany ciepła
interferometria - Opis:
- 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).
- Źródło:
-
Chemical and Process Engineering; 2015, 36, 3; 331-344
0208-6425
2300-1925 - Pojawia się w:
- Chemical and Process Engineering
- Dostawca treści:
- Biblioteka Nauki
Artykuł