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Research Papers

Local Heat Transfer Dependency on Thermal Boundary Condition in Ribbed Cooling Channel Geometries

[+] Author and Article Information
Beni Cukurel

e-mail: bcukurel@technion.ac.il

Tony Arts

e-mail: arts@vki.ac.be
von Karman Institute for Fluid Dynamics,
Turbomachinery Department,
Chaussée de Waterloo, 72,
B-1640 Rhode-St-Genese, Belgium

1Present address: The Turbo and Jet Engine Laboratory, Faculty of Aerospace Engineering, Technion, Israel Institute of Technology, Haifa 32000, Israel.

2Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the Journal of Heat Transfer. Manuscript received April 17, 2012; final manuscript received January 17, 2013; published online September 11, 2013. Assoc. Editor: Roy E. Hogan.

J. Heat Transfer 135(10), 101001 (Sep 11, 2013) (11 pages) Paper No: HT-12-1168; doi: 10.1115/1.4024494 History: Received April 17, 2012; Revised January 17, 2013

The present study is geared toward quantifying the effects of imposed thermal boundary condition in cooling channel applications. In this regard, tests are conducted in a generic passage, with evenly distributed rib type perturbators at 90 deg, with a 30% passage blockage ratio and pitch-to-height ratio of 10. Uniform heat-flux is imposed on the external side of the slab which provides Biot number and solid-to-fluid thermal conductivity ratio around 1 and 600, respectively. Through infrared thermometry measurements over the wetted surface and via an energy balance within the solid, conjugate heat transfer coefficients are calculated over a single rib-pitch. The local heat extraction is demonstrated to be a strong function of the conduction effects, observed more dominantly in the rib vicinity. Moreover, the aero-thermal effects are investigated by comparing the findings with analogous aerodynamic literature, enabling heat transfer distributions to be associated with distinct flow structures. Furthermore, the results are contrasted with the iso-heat-flux wetted boundary condition test case. Neglecting the thermal boundary condition dependence, and thus the true thermal history of the boundary layer, is demonstrated to produce large errors in heat transfer predictions.

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References

Figures

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Fig. 1

Conjugate (a) versus convective (b) heat transfer

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Fig. 2

Schematic of the experimental setup

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Fig. 3

Ribbed slab FEM model

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Fig. 4

Conjugate flat plate Nusselt number

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Fig. 5

Visualization of the ribbed channel flow field [33]

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Fig. 6

Pitch temperature distribution (K)

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Fig. 7

Symmetry line temperature/normalized heat flux

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Fig. 8

Pitch enhancement factor distribution

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Fig. 9

Widthwise averaged EF and X distribution

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