When1: 1904
When2: 1920
Who: Ludwig Prandtl [Prandtl, Ludwig]
What: physicist
Where: Germany
Detail: He lived 1875 to 1953. Flow has two regions. One is potential flow, with incompressible and non-rotating fluid. The other is thin boundary layer next to tube or obstruction, where there are viscous effects and where surface interacts thermally and mechanically with fluid [1904]. Wing induces drag as it lifts {lifting line theory, Prandtl} [1920].
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Date Modified: 2022.0224