The problem is also solved for (i) rocking motion and uniform annuli and (ii) translational motion for diffuser-shaped annuli, with only MP analysis.
It is not clear, however, if there is a limit for diffuser-augmented turbines or whether the structural and other costs of the diffuser outweigh any gain in power.
These were: 10 1 and 9.2 1 for the BK7 diffuser for 0.5 and 0.9 NA respectively; 1.2 1 and 1.1 1 for the SF2 diffuser for 0.5 and 0.9 NA respectively.
For example, they are only valid for one diffuser type at a particular location.
Although we assumed the board has Lambertian-transmission property and scattering effect is ignored, which did not give obvious effects in the results in the experiment, for more precise reconstruction, calibration method for the diffuser board should be considered.
Also look for a diffuser that's about 2½-3" wide for better heat distribution and that has at least 1-2" long "fingers" to help separate curls.
The model is based on plume theory for the heat source and a fountain model for the diffuser flow, and predicts a steady-state two-layer stratification in the room.
Also, the air flow was changed to produce different corresponding throw for the tested diffusers (T0.25), which with characteristic space length for the diffuser jet flow (L) defined T0.25/L ratio.
David Scarborough, a senior research engineer, teaches the jet and rocket propulsion class, full of terms like isentropic flow and stagnation states as well as adiabatic efficiency for the diffuser.
