Heat transfer due to unsteadily impinging jets.
Author(s) : HERWIG H., MOCIKAT H., GÜRTLER T., et al.
Type of article: Article
Summary
In a systematic experimental study, the heat transfer under three different periodically unsteady jets is compared with that of the corresponding steady inline jet. Unsteadiness of the jets is created by vortex shedding (Karman jet nozzle), alternating flow passages (flip-flop nozzle) as well as by a precessing motion of the whole jet (precessing jet nozzle). The unsteadiness of the jets is self-sustained, i.e. there are no external (mechanical) means and no external energy input to create unsteadiness. Heat transfer data in terms of Nusselt numbers were determined on a specially designed heat transfer plate in the plane of jet impingement. Whilst there is a slight increase in heat transfer performance when vortex shedding occurs within the jet (Karman jet nozzle), in both other cases there is a considerable decrease in heat transfer.
Details
- Original title: Heat transfer due to unsteadily impinging jets.
- Record ID : 2005-0610
- Languages: English
- Source: International Journal of thermal Sciences - vol. 43 - n. 8
- Publication date: 2004/08
Links
See other articles in this issue (1)
See the source
Indexing
- Themes: Mass transfer
- Keywords: Jet; Heat transfer; Transient state; Steady state; Research; Expérimentation
-
Transient thermal structure, turbulence, and he...
- Author(s) : NARAYANAN V., SEYED-YAGOOBI J., PAGE R. H.
- Date : 2004/11
- Languages : English
- Source: International Journal of Heat and Mass Transfer - vol. 47 - n. 24
View record
-
Theoretical study on impingement heat transfer ...
- Author(s) : CHEN Y. C., MA C. F., QIN H., et al.
- Date : 2005/07
- Languages : English
- Source: International Journal of Heat and Mass Transfer - vol. 48 - n. 16
View record
-
Heat transfer under a precessing jet: effects o...
- Author(s) : GÖPPERT S., GÜRTLER T., MOCIKAT H., et al.
- Date : 2004/06
- Languages : English
- Source: International Journal of Heat and Mass Transfer - vol. 47 - n. 12-13
View record
-
Delay of wetting propagation during jet impinge...
- Author(s) : MOZUMDER A. K., MONDE M., WOODFIELD P. L.
- Date : 2006/04
- Languages : English
- Source: International Journal of Heat and Mass Transfer - vol. 48 - n. 25-26
View record
-
Numerical study of momentum and heat transfer i...
- Author(s) : MARZOUK S., MHIRI H., GOLLI S. el, et al.
- Date : 2003/10
- Languages : English
- Source: International Journal of Heat and Mass Transfer - vol. 46 - n. 22
View record