EFFECT OF HOLE SHAPE ON ROUGHNESS FRICTION FACTOR IN PERFORAT-ED AND SLOTTED HORIZONTAL BOREHOLES USED FOR OPENCAST MINE DEWATERING


https://doi.org/10.17073/2500-0632-2018-2-9-12

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Abstract

Horizontal boreholes were adapted for using in mine dewatering systems. Efficient and economically sound application of this new method of dewatering requires using perforated or slotted pipes as filters when installing casing. Pressure drop along a horizontal borehole is a major factor that affects the borehole performance. The pressure drop is caused by four separate effects: wall friction, perforation roughness, inflow acceleration, and mixing effects. This paper is devoted to studying the effects of these two former factors in perforated or slotted pipes. Numerical analysis was carried out using different types of perforation holes and slots. The simulation model was constructed using ANSYS Fluent 14.5 software. The results showed that at high Reynolds number, roughness friction factor values in perforated pipes with circular holes are significantly higher than those in slotted pipes with axially elongated slots and slotted pipes with perpendicular (to pipe axis) slots.

About the Authors

Duc Huan Tran
Freiberg University of Mining and Technology Hanoi University of Mining and Geology
Germany

6, Akademischestrafte, Freiberg, Germany, D-09596

18, Pho Vien Street, Duc Thang Ward, Bac Tu Liem District, Hanoi, Vietnam


Carsten Drebenstedt
Freiberg University of Mining and Technology
Germany
6, Akademischestrafte, Freiberg, Germany, D-09596


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Supplementary files

For citation: Tran D., Drebenstedt C. EFFECT OF HOLE SHAPE ON ROUGHNESS FRICTION FACTOR IN PERFORAT-ED AND SLOTTED HORIZONTAL BOREHOLES USED FOR OPENCAST MINE DEWATERING. Gornye nauki i tekhnologii = Mining Science and Technology (Russia). 2018;(2):9-13. https://doi.org/10.17073/2500-0632-2018-2-9-12

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