Convective heat transfer from in-tube flow of turbulent supercritical carbon dioxide: Part 1 - Numerical analysis

A mathematical model to simulate the turbulent flow of supercritical carbon dioxide during in-tube cooling is presented. The model is based on the Fav re-averaged, parabolized Navier-Stokes equations and an appropriate turbule nce model. Accurate thermophysical property data for supercritical carbon d ioxide are used as input. The model is used to predict the variations of th e heat transfer coefficient along the length of the tube. It is found that the heat transfer coefficient displays a maximum at some location downstrea m of the inlet. The model results are used to provide an explanation for th e unusual behavior of the heat transfer coefficient and to gain insights on in-tube cooling of supercritical carbon dioxide.