MODULES

Isothermal Mixing Of Two Co-Flowing Laminar Jets In A Horizontal Channel

Problem Definition:

The isothermal mixing of two laminar jets coflowing at different velocities in a coaxial horizontal channel has been taken. The Argon (Ar) is flowing through the inner channel having radius R1 into the mixing section while ambient air is drawn through the outer channel having radius R2. A schematic layout of the problem definition is shown in Fig. 1.1. At the inlet of the channel fully developed velocity profiles for both the gases has been specified such that the ratio of average velocities for both the gases is 0.517 m/s. The geometric and flow parameters for the given problem are as follows:






Figure 1.1: Schematic diagram of the coaxial horizontal channel for isothermal mixing case


Results:

The numerical simulation is carried out by considering the half of the domain with 4000 hexahedral cells. At t = 0, both the two gases starts flowing into the channel which at steady-state forms a homogenous mixture. A quantitative comparison of transverse distribution of concentration of Ar at different axial locations (at x = 4, 16, 30 in.), previously done by Shavit and Laval [36], are shown in Figure 1.2.


Figure 1.2: Transverse distribution of Ar Concentration at different axial locations

References

[1] Shavit G. and Lavan Z. (1973) ‘Analytical and experimental investigations of laminar mixing of confined heterogeneous jets’, The American Institute of Aeronautics and Astronautics, vol. 11(3), pp. 352–358.