Parametric Golden Spiral Fan Duct v0.2

thingiverse

Updated Apr 2017 User PGent fixed the shroud wall generation code back in 2015. I owe him or her a huge apology for not merging the bugfix for a year and a half. Thank you and I am sorry. Parametric fan duct derived from http://www.thingiverse.com/thing:139984 incorporating cross-section reduction as an exponential function of the golden ratio conjugate. Default settings result in: 40mm cpu fan form factor M3 screw bores approximately 25% reduction in diameter 5 fins 10mm OD ball joint articulating surface Overview and Background Golden Spiral Fan Duct v0.2 Edward Stradinger - Jan 2014 Shroud 2d polygon code fixed by user PGent - Nov 2015 Derivative of http://www.thingiverse.com/thing:139984 by ei8ghtohms Given fan dimensions construct a conical shroud featuring internal fins to guide the airflow into a vortex. As the cross sectional area of the cone decreases the radial motion component also decreases, allowing a greater distance over which the air can accelerate, diminishing turbulent flow and fostering an axial low pressure zone which, upon exiting the nozzle, increases the duration of vortex coherence.