Abstract
In this paper, an exact analytical solution for creeping flow of Bingham plastic fluid passing through curved rectangular ducts is presented for the first time. The closed form of axial velocity distribution, flow resistance ratio, and wall shear stress are derived using bounded Fourier transformation. An extensive investigation on mutual effects of Hedstrom number, curvature ratio, and aspect ratio is conducted. The results indicate that a drag reduction is caused in the flow field by increasing the Hedstrom number. It is shown that unlike the Newtonian creeping Dean flow, the critical aspect ratio (an aspect ratio in which the flow resistance ratio is independent from curvature ratio) does not exist at large enough Hedstrom numbers. Analytical solution also indicated that as Hedstrom number is increased, the value of Poiseuille number is enhanced, and unlike the Newtonian flows, the value of Poiseuille number is not zero at edges of cross section.
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This paper is presented based on a research project which is granted by Shahrood University. Therefore, the authors appreciate for their financial supports.
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Norouzi, M., Zare Vamerzani, B., Davoodi, M. et al. An exact analytical solution for creeping Dean flow of Bingham plastics through curved rectangular ducts. Rheol Acta 54, 391–402 (2015). https://doi.org/10.1007/s00397-014-0807-x
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DOI: https://doi.org/10.1007/s00397-014-0807-x