Vortex based hydrodynamic cavitation and anaerobic digestion sugarcane bagasse biorefineries for revitalising the sugar industry.

The aim of this study was to evaluate the effectiveness hydrodynamic cavitation (HC) as a pre-treatment method for selected organic wastes. In these HC experiments, municipal wastewater (MW) and mature landfill leachate (MLL) well mixtures lignocellulosic waste (LB) suspended in streams were investigated. For all tests, same operational parameters assumed: an inlet pressure 7 bar, 30 recirculat...

Surfaces can be slippery or sticky depending on surface chemistry and roughness. We demonstrate in atomistic simulations that regular and random slip patterns on a surface lead to pressure excursions within a lubricated contact that increase quadratically with decreasing contact separation. This is captured well by a simple hydrodynamic model including wall slip. We predict with this model that...

The direct numerical simulation (DNS) method has been used to the study of the linear and shock wave propagation in bubbly fluids and the estimation of the efficiency of the cavitation mitigation in the container of the Spallation Neutron Source liquid mercury target. The DNS method for bubbly flows is based on the front tracking technique developed for free surface flows. Our front tracking hy...

Cavitation is a phase change phenomenon generated by the static pressure reduction of liquid medium at constant temperature. This process has been considered as disadvantageous mechanism in most turbomachinery systems, however, its potential releasing energy bubble collapse stage received lots attention recent decades. Particularly, applicability this micro scale gives rise to research studies ...

The influence of leading edge sheet cavitation and supercavitation on the added mass effects experienced by a 2-D NACA0009 truncated hydrofoil has been experimentally investigated in a hydrodynamic tunnel. A non-intrusive excitation and measuring system based on piezoelectric patches mounted on the hydrofoil surface was used to determine the natural frequencies of the fluid–structure system. Th...

Submerged structures that operate under extreme flows are prone to suffer large scale cavitation attached to their surfaces. Under such conditions the added mass effects differ from the expected ones in pure liquids. Moreover, the existence of small gaps between the structure and surrounding bodies filled with fluid also influence the dynamic response. A series of experiments and numerical simu...