Abstract
A brief account is given of the analogy between the transfer of heat and the transfer of momentum. For asymmetric heat transfer in annular flow, the distributions of friction and thermal flux associated with the transport processes are considered. By simplifying the equations describing these distributions, and using an observed experimental fact concerning the temperature profile, the analogy is modified to apply to the annular flow with a fluid having a Prandtl number equal to 1. The modification results in additional factors in the final form of the conventional heat-transfer equation. These factors are functions of the annulus radius ratio parameter. A comparison is made between the final result and the recommendation of a well known authority.
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