Rf. Barron et al., EVALUATION OF THE EIGENVALUES FOR THE GRAETZ PROBLEM IN SLIP-FLOW, International communications in heat and mass transfer, 23(4), 1996, pp. 563-574
A technique was developed for evaluation of the eigenvalues for the Gr
aetz problem extended to slip-flow. The first four eigenvalues for Knu
dsen numbers of 0.02, 0.04,..., 0.12 were found. By using a least squa
re curve-fit method, simplified relationships between the eigenvalues
and Knudsen number were obtained. The efficient and accurate determina
tion of the eigenvalues will lead to better predictions of heat transf
er in rarefied gas flows and for gas flows in microtubes.