Fig. 1: Classification of thermally induced flows.
From: Knudsen pumps: a review

a Thermal creep flow, b inverted thermal creep flow, c thermal stress slip flow, d (nonlinear) thermal stress flow, e thermal edge flow, f radiometric flow
From: Knudsen pumps: a review

a Thermal creep flow, b inverted thermal creep flow, c thermal stress slip flow, d (nonlinear) thermal stress flow, e thermal edge flow, f radiometric flow