In many practical instances such as basic design, parametric study, and optimization analysis of thermal systems, it is often very convenient to have closed form relations to obtain the trends and a reasonable estimate of the Nusselt number. However, finding exact solutions for many practical singly-connected cross-sections, such as trapezoidal microchannels, is complex. In the present study, the square root of cross-sectional area is proposed as the characteristic length scale for Nusselt number. Using analytical solutions of rectangular, elliptical, and triangular ducts, a compact model for estimation of Nusselt number of fully-developed, laminar flow in microchannels of arbitrary cross-sections with “H1” boundary condition (constant axial wall heat flux with constant peripheral wall temperature) is developed. The proposed model is only a function of geometrical parameters of the cross-section, i.e., area, perimeter, and polar moment of inertia. The present model is verified against analytical and numerical solutions for a wide variety of cross-sections with a maximum difference on the order of 9%.
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ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels
June 23–25, 2008
Darmstadt, Germany
Conference Sponsors:
- Nanotechnology Institute
ISBN:
0-7918-4834-5
PROCEEDINGS PAPER
Estimation of Nusselt Number in Microchannels of Arbitrary Cross-Section With Constant Axial Heat Flux Available to Purchase
Ehsan Sadeghi,
Ehsan Sadeghi
University of Victoria, Victoria, BC, Canada
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Majid Bahrami,
Majid Bahrami
Simon Fraser University, Burnaby, BC, Canada
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Ned Djilali
Ned Djilali
University of Victoria, Victoria, BC, Canada
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Ehsan Sadeghi
University of Victoria, Victoria, BC, Canada
Majid Bahrami
Simon Fraser University, Burnaby, BC, Canada
Ned Djilali
University of Victoria, Victoria, BC, Canada
Paper No:
ICNMM2008-62198, pp. 203-211; 9 pages
Published Online:
June 11, 2009
Citation
Sadeghi, E, Bahrami, M, & Djilali, N. "Estimation of Nusselt Number in Microchannels of Arbitrary Cross-Section With Constant Axial Heat Flux." Proceedings of the ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels. ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels. Darmstadt, Germany. June 23–25, 2008. pp. 203-211. ASME. https://doi.org/10.1115/ICNMM2008-62198
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