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Energies 2017, 10(9), 1401; doi:10.3390/en10091401

Experimental Investigation of Flow Domain Division in Beds Packed with Different Sized Particles

1,2
,
1,2,* , 1
and
1,2
1
Center of Rock Instability and Seismicity Research, School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China
2
Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, Northeastern University, Shenyang 110819, China
*
Author to whom correspondence should be addressed.
Academic Editor: Leonardo P. Chamorro
Received: 14 August 2017 / Revised: 3 September 2017 / Accepted: 11 September 2017 / Published: 14 September 2017
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Abstract

Seepage in a medium packed with particles of variable granular size can be seen in many fields of engineering applications. Due to the relative complex spatial aspect of pore geometry, there are notable differences in the critical parameters of flow transition (Reynolds number and Forchheimer number) between different structures. It is difficult to distinguish the available range of seepage equations and predict the water flux accurately. This work aims to establish the relationship between particle size and flow transition. This is conducted according to the results of flow region division, which obtains the application range for seepage equations. Experiments were carried out in sand columns with nine different particle sizes of sand with mean diameters of 0.0375, 0.1125, 0.225, 0.45, 0.8, 1.5, 2.18, 3.555 and 7.125 mm. Four flow regimes were identified (pre-Darcy regime, Darcy regime, Forchheimer regime and turbulent regime). The experimental data indicate that the permeability increases exponentially and the inertia factor reduces exponentially with an increase in particle diameter. The inertial effect becomes more significant in the medium with larger particles than with finer particles when the flow transition occurs. View Full-Text
Keywords: flow domain division; particle size; flow transition; Reynolds number; Forchheimer number flow domain division; particle size; flow transition; Reynolds number; Forchheimer number
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Yang, X.; Yang, T.; Xu, Z.; Yang, B. Experimental Investigation of Flow Domain Division in Beds Packed with Different Sized Particles. Energies 2017, 10, 1401.

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