How did Ludwig Prandtl suggest the condition known as the Prandtl Condition?
Ludwig Prandtl Ludwig Prandtl (4 February 1875 – 15 August 1953) was a German engineer. He was a pioneer in the development of rigorous systematic mathematical analyses which he used for underlying the science of aerodynamics, which have come to form the basis of the applied science of aeronautical engineering. In the 1920s he developed the mathematical basis for the fundamental principles of subsonic aerodynamics in particular; and in general up to and including transonic velocities. His studies identified the boundary layer, thin-airfoils, and lifting-line theories. The Prandtl number was named after him.
Incontinentia pigmenti Incontinentia pigmenti (IP, also known as "Bloch–Siemens syndrome", "Bloch–Sulzberger disease", "Bloch–Sulzberger syndrome" "melanoblastosis cutis", and "nevus pigmentosus systematicus") is a genetic disorder that affects the skin, hair, teeth, nails, and central nervous system. It is named due to its microscopic appearance.