Journal of Fluids Engineering

Volume: Page/CID:

Modification of Axial Fan Flow by Trailing Edge Self-Induced Blowing
Axial fans often show adverse flow conditions at the fan hub and at the tip of the blade. The modification of conventional axial fan blade is presented. Hollow blade was manufactured from the hub to t...

Direct Simulation Based Model-Predictive Control of Flow Maldistribution in Parallel Microchannels
Flow maldistribution, resulting from bubbles or other particulate matter, can lead to drastic performance degradation in devices that employ parallel microchannels for heat transfer. In this work, dir...

J. Fluids Eng. / Volume 131 / Issue 11 / Research Papers / Flows in Complex Systems

Pressure Drop in Laminar Developing Flow in Noncircular Ducts: A Scaling and Modeling Approach

J. Fluids Eng. -- November 2009 -- Volume 131, Issue 11, 111105 (11 pages)
doi:10.1115/1.4000377

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ABSTRACT

REFERENCES (23)

Author(s):
Y. S. Muzychka
Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, NF, A1B 3X5, Canada

M. M. Yovanovich
Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, ON, N2L 3G1, Canada

Adetailed review and analysis of the hydrodynamic characteristics of laminardeveloping and fully developed flows in noncircular ducts is presented.New models are proposed, which simplify the prediction of thefriction factor–Reynolds product f Re for developing and fully developed flowsin most noncircular duct geometries found in heat exchanger applications.By means of scaling analysis it is shown that completeproblem may be easily analyzed by combining the asymptotic resultsfor the short and long ducts. Through the introduction ofa new characteristic length scale, the square root of cross-sectionalarea, the effect of duct shape has been minimized. Thenew model has an accuracy of ±10% or better formost common duct shapes when nominal aspect ratios are used,and ±3% or better when effective aspect ratios are used.Both singly and doubly connected ducts are considered.