Prediction of friction factors and heat transfer in rib-roughened pipes.

摘要

A computer program based on the discrete element method has been developed and validated to compute Fanning friction factors and Nusselt numbers for fully-developed turbulent flow in pipes artificially roughened with 2-dimensional, rectangular rib-type roughness elements spaced such that reattachment occurs between ribs. The development is presented, and the computed results are compared with appropriate experimental data sets from the heat transfer literature. The predictions generated by the program are, for most cases, in excellent agreement with the experimental data.