The limit enhancement of heat transfer for coolants in the form of a dropping liquid with variable thermophysical properties

A theoretical model is developed for the first time for calculating the limit values of the hydraulic-resistance parameter and heat transfer under conditions of its enhancement in tubes by means of flow turbulization for coolants in the form of dropping liquids with variable thermophysical properties. It is shown that the model describes the relevant processes for a wide range of Reynolds numbers and Prandtl numbers, thus, allowing the reserves for enhancing the nonisothermal heat transfer to be predicted.