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Research Papers: Heat Transfer Enhancement

The Effect of Heat Transfer Area Roughness on Heat Transfer Enhancement by Forced Convection

[+] Author and Article Information
Jozef Cernecky

Associate Professor
Department of Environmental Technology,
Faculty of Environmental and
Manufacturing Technology,
Technical University in Zvolen,
Studentska 26,
Zvolen 960 53, Slovakia
e-mail: cernecky@tuzvo.sk

Jan Koniar

Department of Environmental Technology,
Faculty of Environmental and
Manufacturing Technology,
Technical University in Zvolen,
Studentska 26,
Zvolen 960 53, Slovakia
e-mail: koniar@tuzvo.sk

Zuzana Brodnianska

Department of Environmental Technology,
Faculty of Environmental and
Manufacturing Technology,
Technical University in Zvolen,
Studentska 26,
Zvolen 960 53, Slovakia
e-mail: zuzana.brodnianska@tuzvo.sk

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received December 5, 2012; final manuscript received October 18, 2013; published online January 9, 2014. Assoc. Editor: Phillip M. Ligrani.

J. Heat Transfer 136(4), 041901 (Jan 09, 2014) (8 pages) Paper No: HT-12-1649; doi: 10.1115/1.4025920 History: Received December 05, 2012; Revised October 18, 2013

The paper deals with the visualization of temperature fields in the vicinity of profiled heat transfer surfaces and a subsequent analysis of local values of Nusselt numbers by forced air convection in an experimental channel. Holographic interferometry was used for visualizing the temperature fields. Experiments were carried out at Re 462 up to 2338 at the distances between heat transfer surfaces of 0.025 m and 0.035 m. Temperature contours were determined from the obtained images of holographic interferograms of temperature fields and the local values of Nusselt numbers along the profiled surface for x/s = 0 up to x/s = 1.25 were calculated from them. A significant effect of the profiled surface on the local values of Nusselt numbers can be observed from the obtained results.

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References

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Figures

Grahic Jump Location
Fig. 1

Temperature course through shaped heat transfer surface toward the flowing air

Grahic Jump Location
Fig. 2

Scheme of a holographic variant of the Mach-Zehnder interferometer with a set experimental channel for research into heat transfer

Grahic Jump Location
Fig. 3

Determination of the interference fringe centers (distance from surface, level of gray)

Grahic Jump Location
Fig. 4

Part of the experimental channel for research into heat transfer in the vicinity of heat transfer surfaces

Grahic Jump Location
Fig. 5

Main geometric dimensions of the examined part of heat transfer surfaces and the indication of measuring points for measuring surface temperature (values in mm)

Grahic Jump Location
Fig. 6

Image of holographic interferogram at H = 0.025 m and Re (a) 462, (b) 925, and (c) 1619

Grahic Jump Location
Fig. 7

Image of holographic interferogram at H = 0.035 m and Re (a) 668, (b) 1336, and (c) 2338

Grahic Jump Location
Fig. 8

Distribution of local Nusselt numbers in the vicinity of lower heat transfer area at the gap between the areas H = 0.025 m and Re 462; 925; and 1619

Grahic Jump Location
Fig. 9

Distribution of local Nusselt numbers in the vicinity of the lower heat transfer area at the gap between the areas H = 0.035 m and Re 668; 1336; and 2338

Grahic Jump Location
Fig. 10

Distribution of local Nusselt numbers in the vicinity of lower heat transfer area at the gaps between the plates H = 0.025 m and 0.035 m and Re 462 up to 2338

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