... on the molecular distribution function of the surrounding gas, the ther-mophoretic force can be calculated by integrating the momentum flux imparted by the molecules strik-ing the particle. The ... Equation IncludingThermal Creep Flow,” J. Tribol. 110, p. 253. Gad- el- Hak, M. (2002) “Flow Physics,” in Handbook of MEMS, 1st ed., M. Gad- el- Hak, ed., CRC Press,Boca Raton.Gallis, M. A., Rader, D.J., ... such flows include the hypersonic flows about space vehicles in low earth orbit[Ivanov and Gimelshein, 199 8] or flows in microchannels of MEMS [Gad- el- Hak, 199 9].In high-altitude hypersonic...