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Effect of vortex formation on sediment transport at dual pipe intakes

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Abstract

Vortex formation and subsequent sediment transport into the intake due to sea water withdrawal is one of the problems in coastal engineering. The effect of vortex formation on rate of sediment transport at coastal dual pipe intakes was investigated using a scaled physical model. Experiments were performed on dual pipe intakes at three common intake withdrawal directions (vertical, horizontal and with angle of 45°). In each experiment, the class of vortex with respect to its strength was determined. Particle tracking velocimetry (PTV) was employed to measure tangential velocity of vortices. Results indicated that the rate of sediment transport was considerably affected by the strength of formed vortices. The rate of transported sediment was increased by increasing the strength of formed vortex. Moreover, amount of sediment transport was affected by angle of pipe intakes. It could be concluded that the minimum and maximum rates of sediment transport occur for inclined and horizontal intakes, respectively.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Amirkabir University of Technology, Hafez Avenue, Tehran, Iran

    M R Khanarmuei, H Rahimzadeh, A R Kakuei & H Sarkardeh

Authors
  1. M R Khanarmuei
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  2. H Rahimzadeh
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  3. A R Kakuei
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  4. H Sarkardeh
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Corresponding author

Correspondence to H Rahimzadeh.

List of symbols

D

diameter of pipe intake (m)

D

particle diameter (m)

Fr

Froude number

Fr s

sediment Froude number

G

gravity (m/s2)

K

Von Kármán constant

N Γ

circulation number

Q i

intake discharge (lit/s)

Q s

rate of sediment transport (cm3/s)

Re

Reynolds number

S

submerged depth (m)

S c

critical submerged depth (m)

SG

specific gravity

S/D

non-dimensional submerged depth

\( u^{ * } \)

shear velocity (m/s)

\( V_{\theta } \)

tangential velocity (m/s)

w

particle falling velocity (m/s)

We

Weber number

\( \beta \)

ratio of particle distribution coefficient to momentum coefficient

\( \varGamma \)

vortex strength (m2/s)

\( \gamma_{s} \)

specific weight of sediment (N/m3)

\( \gamma_{f} \)

specific weight of fluid (N/m3)

\( \mu \)

viscosity (kg/m.s)

\( \rho \)

density of fluid (kg/m3)

\( \upsilon \)

kinematic viscosity (kg/s.m)

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Khanarmuei, M.R., Rahimzadeh, H., Kakuei, A.R. et al. Effect of vortex formation on sediment transport at dual pipe intakes. Sādhanā 41, 1055–1061 (2016). https://doi.org/10.1007/s12046-016-0531-6

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  • DOI: https://doi.org/10.1007/s12046-016-0531-6

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