Subcooled Flow Boiling Heat Transfer of Water Based ZnO Nanofluid In A Vertical Annulus

Nanofluid is a colloidal suspension containing nanometer-sized particles dispersed in an aqueous or organicbase fluid. In this study, subcooled flow boiling heat transfer experiments of aqueous nanofluid with low concentrationof ZnO at the atmospheric pressure is conducted. These experiments are performed at several subcooling conditions (30-50 ̊C) and volume flow rate (2-4 lit/min) and heat fluxes (8-110 kW/m2) for both pure water and ZnO nanofluid. Eachexperiment includes two mechanisms of single-phase convection and flow boiling for laminar flow in annular space. Inthe mechanism of single-phase convection, the increment rate of ZnO nanofluid is 11.18 % and it is 8.14 % for boilingregime.

کلیدواژه ها:

Nanofluid ، subcooled boiling ، ZnO