Parametric Golden Spiral Fan Duct v0.2

thingiverse

In April 2017, I'd like to express my gratitude to user PGent, who fixed the shroud wall generation code back in November 2015. Regrettably, I failed to merge that bug fix for a year and a half. Thank you so much, and please accept my apology. This design is based on the parametric fan duct derived from http://www.thingiverse.com/thing:139984. The cross-section reduction is an exponential function of the golden ratio conjugate. Default settings provide a 40mm CPU fan form factor, M3 screw bores, approximately 25% diameter reduction, and five fins. Additionally, there's a 10mm OD ball joint articulating surface. The Golden Spiral Fan Duct v0.2 was created by Edward Stradinger in January 2014, while the shroud 2D polygon code was fixed by user PGent in November 2015. This design features a conical shroud with internal fins to guide airflow into a vortex. As the cross-sectional area of the cone decreases, so does the radial motion component, allowing for a greater distance over which air can accelerate, reducing turbulent flow and fostering an axial low pressure zone. This results in increased coherence of the vortex upon exiting the nozzle.