Transient thermal structure, turbulence, and heat transfer in a reattaching slot jet flow.
Author(s) : NARAYANAN V., SEYED-YAGOOBI J., PAGE R. H.
Type of article: Article
Summary
The role of turbulent fluctuations on the mean heat transfer coefficient in a reattaching slot jet flow was studied experimentally. The convective heat transfer rate and near-wall fluid flow were examined in the recirculation, reattachment, and post-reattachment regions for two nozzle-to-surface spacings of 0.25 and 0.75 times the width of the nozzle bottom plate. In the reattachment region, results indicate a strong correspondence between variances of near-wall velocity fluctuation and peak heat transfer rate for both spacings. Thermal structures that vary in the span-wise direction were identified in the recirculation region from low-frequency transient infrared thermographs of the heated surface. While these thermal structures are confined to regions in the vicinity of nozzle bottom plate for the low nozzle spacing, they span the entire recirculation region at larger spacings. Thermal streaks are observed past reattachment for the larger nozzle spacing, suggesting a periodic break-up and re-formation of the jet curtain. The scaling of heat transfer distribution is affected by the flow structure in the geometrically non-similar area of the recirculating flow beneath the nozzle. A correlation for peak Nusselt number is presented.
Details
- Original title: Transient thermal structure, turbulence, and heat transfer in a reattaching slot jet flow.
- Record ID : 2005-0614
- Languages: English
- Source: International Journal of Heat and Mass Transfer - vol. 47 - n. 24
- Publication date: 2004/11
Links
See other articles in this issue (4)
See the source
Indexing
- Themes: Mass transfer
- Keywords: Jet; Geometry; Heat transfer; Research; Expérimentation; Distribution
-
Numerical modelling of slot-jet impingement coo...
- Author(s) : SAHOO D., SHARIF M. A. R.
- Date : 2004/09
- Languages : English
- Source: International Journal of thermal Sciences - vol. 43 - n. 9
View record
-
Heat transfer characteristics of a slot jet imp...
- Author(s) : CHAN T. L., LEUNG C. W., JAMBUNATHAN K., et al.
- Date : 2002/02
- Languages : English
- Source: International Journal of Heat and Mass Transfer - vol. 45 - n. 5
View record
-
Spray cooling of enhanced surfaces: impact of s...
- Author(s) : SILK E. A., KIM J., KIGER K.
- Date : 2006/12
- Languages : English
- Source: International Journal of Heat and Mass Transfer - vol. 49 - n. 25-26
View record
-
Effects of geometric parameters on confined imp...
- Author(s) : LOU Z. Q., MUJUMDAR A. S., YAP C.
- Date : 2005/12
- Languages : English
- Source: Applied Thermal Engineering - vol. 25 - n. 17-18
View record
-
Effects of jet plate size and plate spacing on ...
- Author(s) : SAN J. Y., SHIAO W. Z.
- Date : 2006/09
- Languages : English
- Source: International Journal of Heat and Mass Transfer - vol. 49 - n. 19-20
View record