The study of heat transfer during boiling subcooled water with micro- and nanoparticles adding


Аuthors

Bobylev P. G.*, Pavlov A. V., Kikot N. E., Bikmulin A. V., Sapozhnikov S. Z.

Peter the Great St. Petersburg Polytechnic University, 29, Polytechnicheskaya str., St. Petersburg, 195251, Russia

*e-mail: pavel_b.g.97@mail.ru

Abstract

The boiling of subcooled water with addition of the Al2O3 and TiO2 micro- and nanoparticles has been studied. The dependencies of the local heat flux density at the heat exchange surface on time were obtained by the gradient heat-metering method. When considering the heat exchange intensification while subcooled liquid boiling on the overheated surface in a large volume, the main criterion is maximum heat flux density. This parameter is directly dependent on both transient and film modes. The dependences of the maximum heat flux density on the suspension subcooling, particles concentration, their size and material were obtained. Gradient heat metering is rather prospective while studying phase transitions and non- stationary processes as long as it allows direct determining of the local heat flux density.

Keywords:

gradient heat metering, heterogeneous gradient heat flux sensors, heat flux per unit area, temporal thermogram, maximum heat flux density, micro- and nanoparticles Al2O3 and TiO2

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