The current work revisits the radiometric channel pumps [1-2] bounded by various configurations investigating their capacity in gas species separation. Direct simulation Monte Carlo (DSMC) method is successfully employed to analyze the separation performance of a series of arrangements for radiometric channel pumps ranging from a simple model inspired by Crookes radiometer to sawtooth structures on both top and bottom walls of the channel. Here, it was suggested to use diffusive walls but set the blade temperature differently to create an axial temperature gradient at the tips of the vane/tooth . The simulations were performed at 퐾푛~1, based on the impeller height. Thus, abrupt temperature variation near the edge extends roughly to a region mean free path away from the edge.Using the esigned pumps, gas separators that make use of the species separation effect of radiometric flow are designed, where it was shown that binary mixtures of different masses and sizes, e.g., He and Xe, could be separated due to the difference of force on species, see Fig. 1.

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