2021/04/26 by Carlos López Plana, Plana, Carlos, Baofang Song +3
Materials Science · #FOS: Physical sciences #Fluid Dynamics (physics.flu-dyn) #Solidification and crystal growth phenomena
paper · pdf · doi:10.48550/arxiv.2104.12600
openalex publication_date 2021/04/26 · openalex created_date 2022/07/25 · openalex updated_date 2026/07/28
We perform direct numerical simulations of a kerosene-water mixture in pipe\nflow under realistic experimental conditions by solving the\nCahn-Hilliard-Navier-Stokes equations. We compute the linear stability of\ncore-annular flow of kerosene and water in a vertical pipe and find that it is\nhighly unstable. By performing DNS initialized with a slightly perturbed\ncore-annular flow, we show that the system transitions to turbulence and\nfinally relaxes into a turbulent slug flow regime provided that the pipe is\nsufficiently long. This configuration presents mild turbulence and large scale\nthree-dimensional recirculation patterns inside the slugs. Our work highlights\nthe need for applying nonlinear-dynamics approaches and carefully selecting the\ndomain length to investigate the patterns observed in two-phase pipe flows and\ndemonstrates the capabilities of phase field methods to reliably simulate\nexperimental conditions.\n