SINOPSIS

Results of an experimental study of heat transfer and hydraulic resistance for the flow of water in tubes with straight and twisted-tape inserts, with axial and radial fluid-flow inlets to the tube, are presented. The transition-to-turbulent-flow regime experimental data are analyzed to show the generalized dependencies of convection on variables that describe the flow geometry and thermal-hydraulic conditions. Based on this parametric analysis, predictive equations are developed for calculation of heat transfer at the initial section of the tube with twisted-tape insert with both axial and radial fluid inlet.