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Article

Unsteady Heat Transfer Enhancement Around an Engine Cylinder in Order to Detect Knock

[+] Author and Article Information
Khaled Loubar, Jéro⁁me Bellettre, Mohand Tazerout

Ecole des Mines de Nantes, DSEE., 4, rue Alfred Kastler, B.P. 20722, 44307 Nantes Cedex 3, France

J. Heat Transfer 127(3), 278-286 (Mar 24, 2005) (9 pages) doi:10.1115/1.1857943 History: Received November 07, 2003; Revised October 22, 2004; Online March 24, 2005
Copyright © 2005 by ASME
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References

Figures

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Computational domain and boundary conditions
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Instantaneous heat flux on wall combustion chamber
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Computational grid for a 2 mm square rib geometry (refined mesh around the rib)
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Grid dependency test—local Nusselt number distributions (Re=12,600, s=0 at xj=0.133 m on the cylinder wall)
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Temperature signal across the cylinder wall (cast iron)
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Temperature amplitude attenuation along the cylinder wall thickness
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Effect of turbulence model choice on the Nusselt number prediction (Re=12,600)
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Streamlines (Re=37,200); (a) Kim et al. 15 and (b) present calculations
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Comparison of predicted and measured mean velocity profiles (Re=37,200)
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Comparison of predicted and measured local Nusselt number (Re=12,600)
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Temporal variation of thermal signal in the fluid (0.5 mm from the wall)
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Recirculation zone downstream the rib (Re=12,000)
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Thermal signal variation for different rib geometries
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Flow structure downstream of the ribs (Re=12,000)
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Effect of rib number on thermal signal variations (h=2 mm)
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Flow structure downstream of one or two ribs (Re=12,000)
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Thermal signal variation for rib heights of 1 mm and 2 mm
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Turbulent kinetic energy contours for square ribs (Re=12,000)
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Thermal signal variation at different locations within the fluid
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Effect of heat transfer intensity on thermal signal amplitude

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