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Research Papers: Forced Convection

Experimental Investigation of the Effects of Fluid Properties and Geometry on Forced Convection in Finned Ducts With Flow Pulsation

[+] Author and Article Information
B. O. Olayiwola

Mechanical Process Engineering, Faculty of Biochemical and Chemical Engineering, Technische Universität Dortmund, Emil-Figge Strasse 68, 44227 Dortmund, Germanyb.olayiwola@bci.uni-dortmund.de

P. Walzel

Mechanical Process Engineering, Faculty of Biochemical and Chemical Engineering, Technische Universität Dortmund, Emil-Figge Strasse 68, 44227 Dortmund, Germanyp.walzel@bci.uni-dortmund.de

J. Heat Transfer 131(5), 051701 (Mar 16, 2009) (6 pages) doi:10.1115/1.2970068 History: Received August 24, 2007; Revised May 13, 2008; Published March 16, 2009

An experimental study was conducted on the effects of flow pulsation on the convective heat transfer coefficients in a flat channel with series of regular spaced fins. Glycerol-water mixtures with dynamic viscosities in the range of 0.001–0.01 kg/ms were used as working fluids. The device contains fins fixed to the insulated wall opposite to the flat and smooth heat transfer surface to avoid any heat transfer enhancement by conduction of the fins. Pulsation amplitude xo=0.37mm and pulsation frequencies f in the range of 10Hz<f<47Hz were applied, and a steady-flow Reynolds number in the laminar range of 10<Re<1100 was studied. The heat transfer coefficient was found to increase with increasing Prandtl number Pr at a constant oscillation Reynolds number Reosc. The effect of the dh/L ratio was found to be insignificant for the system with series of fins and flow pulsation due to proper fluid mixing in contrast to a steady finned flow. A decrease in heat transfer intensification was obtained at very low and high flow rates. The heat transfer was concluded to be dynamically controlled by the oscillation.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Description of the flow behavior

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Figure 2

Experimental setup for heat transfer measurements. (a) cryostat; (b) centrifugal pump; (c) fin (d); PT 100 sensor; (e) copper plate; (f) ratometer; (g) collection vessel; (h) hose pump; (i) motor; (j) connecting rod; (k) diaphragm; (l) overhead tank; (m) unbalanced mass; and (n) insulation.

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Figure 3

Dependence of the heat transfer coefficient on the Reynolds number Re for different Prandtl numbers Pr: (a) Reosc=0, (b) Reosc=200, and xo/dh=0.025

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Figure 4

Influence of the Prandtl number Pr on the heat transfer enhancement at constant Reosc=200 and xo/dh=0.025

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Figure 5

Dependence of the heat transfer enhancement on the Peclet number Pe at constant Reosc for Pr=15, xo/dh=0.025, dh/L=0.0163, hf/dh=0.204, l/dh=1.021, and b/dh=0.136

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Figure 6

Effect of dh/L on heat transfer coefficients for a steady finned flow: Pr=15, hf/dh=0.204, l/dh=1.021, and b/dh=0.136

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Figure 7

Effect of dh/L on heat transfer coefficients for a pulsating finned flow at Reosc=200: Pr=15, xo/dh=0.025, hf/dh=0.204, l/dh=1.021, and b/dh=0.136

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