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Research Papers

Enhancement of Convective Heat Transfer in Internal Compressible Flows by Stationary Inserts

[+] Author and Article Information
Ramin K. Rahmani

Department of MIME, University of Toledo, Toledo, OH 43606rkhrahmani@yahoo.com

Emad Y. Tanbour

Department of Mechanical Engineering, Prince Mohammad Bin Fahd University, Al Khobar 31952, Kingdom of Saudi Arabiaemad-y-tanbour@hotmail.com

Anahita Ayasoufi

Department of MIME, University of Toledo, Toledo, OH 43606aayasoufi@yahoo.com

Hosein Molavi

Department of Mechanical Engineering, Tarbiat Modares University, 14115-143 Tehran, Iranhn.molavi@gmail.com

GAMBIT is a preprocessing tool from FLUENT .

J. Thermal Sci. Eng. Appl 2(1), 011005 (Aug 12, 2010) (10 pages) doi:10.1115/1.4002011 History: Received November 25, 2009; Revised June 16, 2010; Published August 12, 2010; Online August 12, 2010

Enhancement of the natural and forced convection heat transfer has been the subject of numerous academic and industrial studies. Air blenders, mechanical agitators, and static mixers have been developed to increase the forced convection heat transfer rate in compressible and incompressible flows. Stationary inserts can be efficiently employed as heat transfer enhancement devices in natural and mixed convection systems with compressible flow. These devices have low maintenance and operating costs, low space requirements, and no moving parts. Through numerical studies, this paper demonstrates how an insert improves heat transfer in buoyancy driven flow. The numerical predictions are validated using experimental data. Using different measurement tools, the global performance of the insert and the impact of the geometrical parameters are studied, leading to identification of the most effective design for a given application.

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Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

A wavy heat transfer enhancement insert with 101.60 mm pitch size and ten turns (left: top view; right: side view)

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Figure 2

Incoming and outgoing radiant beams

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Figure 3

Schematic view of the test rig

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Figure 4

Schematic view of the water-cooled test jacket

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Figure 5

Wavy heat transfer enhancement insert design (from top to the bottom: 8-, 10-, 12-, and 14-turn inserts)

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Figure 6

Axial velocity contours at the middle of vertical pipe equipped with wavy insert (m/s)

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Figure 7

Cross-sectional velocity vectors at the middle of vertical pipe equipped with wavy insert (m/s)

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Figure 8

Temperature contours at pipe outlet for the pipe with 8-, 10-, 12-, and 14-turn inserts (K)

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Figure 9

Nusselt number contours in the pipe with 8-turn insert

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Figure 10

Nusselt number versus pipe axis (m) for the pipe with no insert

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Figure 11

Nusselt number versus pipe axis (m) from insert leading edge to insert trailing edge for the pipe with 8-turn insert

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Figure 12

Nusselt number versus pipe axis (m) from insert leading edge to insert trailing edge for the pipe with 10-turn insert

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Figure 13

Nusselt number versus pipe axis (m) from insert leading edge to insert trailing edge for the pipe with 12-turn insert

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Figure 14

Nusselt number versus pipe axis (m) from insert leading edge to insert trailing edge for the pipe with 14-turn insert

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