![](/ii/tfec2019.jpg)
ISSN Online: 2379-1748
ISBN Flash Drive: 978-1-56700-483-0
ISBN Online: 978-1-56700-482-3
4th Thermal and Fluids Engineering Conference
ASSESSING THE PHYSICAL VALIDITY OF DNS BENCHMARK TESTS FOR PHASE CHANGE
Abstract
DNS studies aimed at solving flows undergoing phase change commonly make the following two assumptions: i) a constant interface temperature and ii) an incompressible flow field in both the gas and liquid phases. The physical validity of these assumptions is examined by studying a canonical, spherically symmetric bubble growth configuration. This system is solved in the present work by employing a compressible flow treatment combined with a time-varying saturated bubble contents description using an ALE scheme. It is shown that for bubble growth cases, which are parameterized by the Jakob (ja) number, an initial stage of growth exists, which cannot be reliably solved with the current DNS methods. Also, this initial stage is shown to exist for a longer period for higher Jakob numbers, essentially rendering current DNS methods inapplicable for such cases. The reasons controlling this
behavior are analyzed and discussed.