An analysis was made for predicting temperature recovery factors for fully developed flow in a tube. Most of the attention was confined to turbulent flow. Some qualitative results were obtained for laminar flow by setting the eddy diffusivity in the equation for turbulent flow equal to zero and using the incompressible parabolic velocity profile for laminar flow. For zero Mach number the laminar flow results were exact. Radial variation of properties was neglected in most of the calculations. The effect of wall temperature gradient along the tube was negligible for turbulent flow below Mach numbers of 0.9 and 0.96 for Reynolds numbers of 20,000 and 390,000, respectively. For laminar flow the effect became im¬portant at much lower Mach numbers.
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