Abstract
The free molecule flow regime of rarefied gas dynamics and heat transfer is of considerable Interest In any situation dealing with a highly rarefied atmosphere. Free molecule flow occurs when the Knudsen number Kn, is greater than about 3 where Kn = λ/L is the ratio of the mean free path λ to the characteristic length of the system L [1,2]. In a free molecule flow situation collisions between gas molecules are negligible when compared with collisions between gas molecules and the solid surfaces. Hence, a molecule may be considered to travel from one wall to the other without suffering a collision in between.
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