A thermal spray coating process was used to deposit dense 2 mm thick metal skins on the surfaces of square cross-section channels (300 mm × 20 mm × 20 mm) of nickel and copper foams with 10 and 40 PPI (pores per inch) pore densities. A heater was wrapped around the channels to apply surface heat-fluxes varying from 427 to 6846 W/m2. Compressed air was blown through the channels at flow rates of 5–80 l/min. Foam and fluid temperature distributions along the length of the channel and the pressure drop across it were measured. The foam was modeled as a porous medium and properties such as permeability K and inertial coefficient CF were determined from the experimental data. Local and average convective heat transfer coefficients were calculated from air and foam temperature measurements. Nusselt numbers were calculated and correlated in terms of the Reynolds, Prandtl, and Darcy numbers. Heat transfer to air flowing through a 10 PPI foam channel was shown to have increased nearly seven times compared to that of hollow tube with the same dimensions.
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Porous Media
Forced Convection Heat Transfer in Spray Formed Copper and Nickel Foam Heat Exchanger Tubes
Sanjeev Chandra
Sanjeev Chandra
Department of Mechanical and Industrial Engineering, Centre for Advanced Coating Technologies,
University of Toronto
, Toronto, ON, M5S 3G8, Canada
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Sanjeev Chandra
Department of Mechanical and Industrial Engineering, Centre for Advanced Coating Technologies,
University of Toronto
, Toronto, ON, M5S 3G8, Canada
J. Heat Transfer. Jun 2012, 134(6): 062602 (10 pages)
Published Online: May 8, 2012
Article history
Received:
March 18, 2011
Revised:
November 16, 2011
Online:
May 8, 2012
Published:
May 8, 2012
Citation
Tsolas, N., and Chandra, S. (May 8, 2012). "Forced Convection Heat Transfer in Spray Formed Copper and Nickel Foam Heat Exchanger Tubes." ASME. J. Heat Transfer. June 2012; 134(6): 062602. https://doi.org/10.1115/1.4006015
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