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TECHNICAL BRIEFS

Heat Transfer Correlations for Turbulent Mixed Convection in the Entrance Region of a Uniformly Heated Horizontal Tube

[+] Author and Article Information
Walter Grassi

LOTHAR (Low gravity and Thermal Advanced Research laboratory) Department of Energetics “L. Poggi,”  University of Pisa, via Diotisalvi 2, 56126 Pisa, Italyw.grassi@ing.unipi.it

Daniele Testi

LOTHAR (Low gravity and Thermal Advanced Research laboratory) Department of Energetics “L. Poggi,”  University of Pisa, via Diotisalvi 2, 56126 Pisa, Italyd.testi@ing.unipi.it

J. Heat Transfer 128(10), 1103-1107 (Mar 06, 2006) (5 pages) doi:10.1115/1.2345436 History: Received January 13, 2006; Revised March 06, 2006

Flow of perfluorohexane in the entry region of a uniformly heated horizontal cylindrical duct was studied in a regime of weakly turbulent mixed convection. Heat transfer coefficients were measured at five cross sections along the heated length and various values of flow rate and heat flux were imposed. A different thermofluid-dynamic behavior was observed between the upper and lower sides of the pipe. Correlations of the Nusselt number for developed and developing flow were proposed, showing agreement with the experimental data within the 10% deviation band.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of the test loop

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Figure 2

Detail of the test section

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Figure 3

Nuup̱down versus Riq̱x

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Figure 4

Deviation between the experimental data and the values predicted by Eq. 9

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