Sharif Digital Repository

In this study, counterflow heat transfer around a rotating cylinder, heated and cooled cylinders, as well as through converging and diverging channels with hyperbolic, elliptical, and forward- and backward-facing step geometries, is numerically investigated. The simulations are performed using the two-fluid model based on the Gorter–Mellink formulation, with the primary objective of achieving a deeper understanding of superfluid helium behavior and improving the design of thermal heat exchangers. To this end, a novel algorithm is developed to couple the momentum equations of the two components with the pressure field. Unlike many previous studies, common simplifying assumptions are avoided,...