Thermal transpiration

1879 Thermal transpiration

The book of science

Tom Sharp

Osborne Reynolds, Martin Knudsen fluid dynamics

Thermal transpiration

When molecules abhor

Leaking pores

Thermal transpiration is enhanced when the average distance that a gas molecule moves between collisions is larger than the dimensions of the channel in which the molecules move, given that the walls of the channel at its entrance are cooler than the walls at its exit.

However, even after all these years, Osborne Reynold’s explanation of the Crookes radiometer is still controversial.

See also in The book of science:

Readings on wikipedia: