Heat and Mass Transfer

, Volume 52, Issue 3, pp 611–619 | Cite as

Numerical analysis of lamination effect in a vortex micro T-mixer with non-aligned inputs

  • Ramin Rabani
  • Shahram Talebi
  • Mehrdad Rabani


In the present study, the lamination effect in a micro T-mixer with non-aligned inputs on the mixing index has been investigated numerically in four different cases. The multi-block lattice Boltzmann method has been implemented for the flow field simulation and the second order upwind finite difference scheme has been used to simulate mass transfer. Reynolds numbers includes in the range of 10 ≤ Re ≤ 70. The simulation results show that the lamination effect in the mixer inputs, despite of its simple design, causes the interface of two fluids to increase and also to make the vortex effect stronger in the confluence of two fluid streams that increases the mixing index considerably. Of four lamination cases included for the mixing input, the maximum mixing index is for the vertical and asymmetrical lamination at the Reynolds number of 70 that is equal 0.689 and the minimum mixing index is for the horizontal and asymmetrical lamination at the Reynolds number of 10 that is equal 0.198.


Vortex Reynolds Number Lamination Recirculation Zone Lattice Boltzmann Method 
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




Water mass-fraction


Ethanol mass-fraction


Diffusivity of water and ethanol


Hydraulic diameter


Characteristic length


Dimensionless pressure


Reynolds number


Schmit number

U, V, W

Dimensionless velocity


Velocity vector

X, Y, Z

Dimensionless directions


Lattice speed vector in the link of ith


Velocity distribution function


Post-collision distribution function


Equilibrium distribution function


Mean static pressure (Pa)


Location vector

x, y, z

Cartesian directions

Greek symbols




Velocity relaxation time


Kinematic viscosity (m2/s)


Weighting coefficient


Non-dimensional circulation


Vorticity in the z direction


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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringYazd UniversityYazdIran

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