The video featured on this page illustrates the performance of the Airius fan unit in a real-world test. Airius fans destratify by delivering a laminar flow of air from ceiling to floor with enough energy to cause the “plume” of air movement you see above. Our patented technology removes the rotational component from the air that is induced by the axial fan. This “untwisting” of the air mitigates dispersal as the organized column reaches floor level. The column then entrains a portion of the surrounding dead pool of air and sets in motion a torus shaped circulation pattern.
The Reynolds number (Re) is a fluid mechanics measurement used to predict the transition from laminar to turbulent flow. Its equation (Re = ρuL/μ) states that the density of the fluid, times the velocity of the fluid, times the length the fluid must travel, mediated by the fluid’s dynamic viscosity, will be a predictor of the turbulence of the flow. The following values would create a flow that is more laminar and less turbulent: low fluid density, low kinematic velocity, low travel distance, and high dynamic viscosity.
The critical Reynolds number, the point at which a flow changes from laminar to turbulent, depends on the environment in which the flow occurs. The most troubling environmental problem we face with axial turbine destratification fans is the rotational energy introduced into the flow by the fan itself. In the equation for a Reynold’s number calculation, we must include not only the kinematic velocity of the air leaving the fan perpendicular to the floor, but the angular velocity of the rotating air within the turbine.
The Stator Advantage
All Airius units include our patented stator which was designed to counteract the rotational energy introduced by the axial turbine fan before the air exits the nozzle. This angular force is redirected parallel to the main kinematic flow, creating more force and a less turbulent flow. By achieving this reduction to the flow’s Reynolds number, we were able to add our patented venturi nozzle which gives the fan its “pear” shape. The nozzle increases the pressure of the flow exiting the unit. Since the stator has given us the advantage of a lower Reynold’s number, and the venturi nozzle has increased our kinematic velocity, we can achieve air throws of up to 125ft. before we approach the critical Reynold’s number and the air flow becomes turbulent.