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Experimental investigation of slip velocity and settling distribution of micro-particles in converging–diverging microchannel

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Abstract

An experimental test bed based on single particle tracking techniques is employed in order to investigate the velocity domain, slip velocity, and settling distribution of micro-particles in low-Reynolds number poiseuille flow in converging–diverging microchannel. Three-dimensional velocity domain of particles are studied in the presence of walls and compared with the particle-free fluid. The results show that the velocity of particles moving near the side walls of microchannel decreases about 30 % compared to those moving at the centerline. Furthermore, the effects of converging–diverging geometry on sedimentation of micro-particles are considered. The results show an average decrease of about 40 % in sedimentation of particles among the total particles in converging–diverging channels which is one of the main advantages of these channels in comparison with the straight types.

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Abbreviations

A :

Channel cross section (µm2)

a :

Distance of particle center from the side wall (µm)

D :

Particle diameter (µm)

d :

Distance of particle center from the bottom wall (µm)

g :

Gravitational acceleration (ms−2)

H :

Channel height (µm)

p :

Pressure gradient (pa)

Q :

Flow rate (µl h−1)

RMS :

Root mean square

u :

Fluid velocity (µm s−1)

v :

Particle velocity (µm s−1)

w :

Channel width (µm)

μ :

Viscosity of liquid (Pa s)

ρ :

Density (g cm −3)

α :

Percentage of velocity variation

c :

Centerline

Cs:

Center of straight channel

Ct:

Center in the throat

f :

Fluid

g :

Gravity

gl :

Glycerol

h :

Hydraulic diameter

max :

Maximum

p :

Particle

s :

Straight channel

T:

Throat

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Acknowledgments

The experiments were conducted in the research laboratory supervised by Professor M. H. Saidi at Center of Excellence in Energy Conversion (CEEC) of Sharif University of Technology.

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Authors and Affiliations

  1. Department of Mechanical and Aerospace Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran

    Farhud Shirinzadeh & Alireza Davari

  2. Center of Excellence in Energy Conversion (CEEC), School of Mechanical Engineering, Sharif University of Technology, Tehran, P. O. Box 11155-9567, Iran

    Mohammad Hassan Saidi

Authors
  1. Farhud Shirinzadeh
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  2. Mohammad Hassan Saidi
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  3. Alireza Davari
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Correspondence to Mohammad Hassan Saidi.

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Shirinzadeh, F., Saidi, M.H. & Davari, A. Experimental investigation of slip velocity and settling distribution of micro-particles in converging–diverging microchannel. Microsyst Technol 23, 3361–3370 (2017). https://doi.org/10.1007/s00542-016-3139-1

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  • DOI: https://doi.org/10.1007/s00542-016-3139-1

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