Abo Bibliothek: Guest

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

EXPERIMENTAL INVESTIGATION ON POOL BOILING MECHANISM OF THE GRADIENT METAL FOAM

Get access (open in a dialog) DOI: 10.1615/IHTC16.bae.022409
pages 871-878

Abstrakt

Pool boiling curves, bubble growth and fiber temperature variations of the gradient metal foam have been experimentally investigated during pool boiling under atmospheric pressure in pure water and surfactant solutions. The experimental results show that sodium dodecyl sulfate enhances pool boiling heat transfer the gradient foam in most heat fluxes while n-heptanol worsens. The phenomena captured by a high-speed cameral show that, small bubbles generating beside the heating wall are sucked into the gradient metal foam pores, in which coalescence and breakage happens. Bubble growth frequency and size heavily affect fiber temperature variation of the gradient foams. Fiber temperature variation trend differs with the locations on gradient foam surface. Bubble growth and fiber temperature are heavily affected by the pore gradient and liquid surface tension. The experimental results also show that adding surfactants into pure water change the fiber temperature in gradient metal foams.