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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

NUMERICAL SIMULATION OF FILM BOILING ON DOWNWARD FACING HORIZONTAL FLAT AND CURVED SURFACES

Get access (open in a dialog) DOI: 10.1615/IHTC16.bae.023412
pages 779-786

Аннотация

In the present study, a Coupled Level Set and Volume of Fluid (CLSVOF) interface capturing method is used to investigate the flow and heat transfer characteristics of two-dimensional laminar film boiling on downward facing surfaces. The CLSVOF method is developed for collocated, unstructured grids and incorporates a multi-dimensional advection of the volume fraction, and a geometrically reinitialized level set field for the interface normal and curvature estimation. The heated surface is considered to be isothermal and submerged in a saturated liquid pool. Different geometries of the surface − flat and curved − are considered, and the effect of curvature and surface area of the heated surface on heat transfer is quantified. An increase in the surface curvature results in the enhancement of the overall heat transfer coefficient due to the corresponding increase in the vapour release angle at the edge of the heated surface, while an increase in the surface area has a minor detrimental effect on the same. Comparison is also made between heat transfer results from the aforementioned configurations and saturated film boiling from an upward facing flat plate at the same wall superheat.