Study on the numerical simulation of the dissolved air releaser in the energy microalgae recovery device

Dissolved air flotation recovery is one of the feasible microalgae recovery methods. Choose the standard k - ε turbulent calculation model to conduct numerical simulation to the flow field of the dissolved air releaser of the energy microalgae recovery device, and study the structural parameters and power dissipation. The result of the numerical simulation conducted to the value of the velocity, pressure and turbulent kinetic energy shows that, under the given boundary conditions, the total energy consumption of the dissolved air water flowing through the releaser can reach over 90%, among which, 60% comsumed in the flow is occurred from the small room to the paralleled slit, and nearly 30% is consumed in the ring groove. So the two structures are useful tools to dissipate energy and dissolve air. Meanwhile, the structure of small room-paralleled slit can turn the internal energy into kinetic energy effectively, generate vortex turbulence and large velocity gradient, to promote the escape of air molecules and gas-liquid mass transferation, facilitating the merging of micro bubbles in the same direction and produce tiny bubbles.