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Heat and Mass Transfer

, Volume 52, Issue 12, pp 2593–2608 | Cite as

Experimental investigation of head resistance reduction in bubbly Couette–Taylor flow

  • R. MaryamiEmail author
  • M. Javadpoor
  • S. Farahat
Original

Abstract

Small bubble experiments are carried out in a circulating vertical Couette–Taylor flow system to investigate the effect of air bubbles on head resistance. In the system with inner rotating cylinder and circulating flow, flow is combined with circumferential and axial flow. Moreover, the variation range of rotational Reynolds number is \(7 \times 10^{3} \le {Re}_{\omega } \le 70 \times 10^{3}\) and small bubbles are dispersed into fully turbulent flow which consists of Taylor vortices. The modification of head resistance is examined by measuring the pressure difference between two certain holes along the cylinders axis. The results show that head resistance is decreased in the presence of small bubbles and a head resistance reduction greater than 60 % is achieved in low \({Re}_{\omega }\) s and in all \({Re}_{ax}\) s changing from 299.15 to 396.27. The effect of air bubbles on vortices could be possible reason for head resistance reduction. Since Taylor vortices are stable in this regime, bubbles decrease the momentum transfer by elongating vortices along the axis of cylinders and decreasing their numbers. The positive effect of air bubbles on head resistance reduction is diminished when \({Re}_{\omega }\) is increased. Moreover, in certain ranges of \({Re}_{\omega }\), small bubbles enhance head resistance when \({Re}_{ax}\) is increased. It is predicted that negative effect of small bubbles on head resistance reduction is due to flow turbulence enhancement when \({Re}_{\omega }\) and \({Re}_{ax}\) are increased.

Keywords

Void Fraction Drag Reduction Axial Flow Small Bubble Fluid Element 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

List of symbols

r

Cylinder radius (m)

l

Distance between pressure holes (m)

h

Head loss (m)

vm

Mean velocity of axial flow (m/s)

Q

Volume flow rate (m3/s)

g

Gravity (m/s2)

\(\Delta P = P_{2} - P_{1}\)

Pressure difference between pressure holes (N/m2)

Re

Reynolds number (−)

Ta

Taylor number (−)

Greek symbols

λ

Head resistance coefficient (−)

ν

Kinematic viscosity (m2/s)

ω

Angular velocity (rpm)

\(\delta = r_{2} - r_{1}\)

Gap width (m)

ξ

Head resistance coefficient ratio (−)

γ

Specific weight (N/m3)

ρ

Density (kg/m3)

Subscripts

1

Inner cylinder

2

Outer cylinder

ax

Axial

ω

Rotational

w

Water

a

Air

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringUniversity of Sistan and BaluchestanZahedanIran

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