The effect of mechanical agitation on the microalgae Phaeodactylum tricornutum and Porphyridium cruentum was investigated in aerated continuous cultures with and without the added shear protectant Pluronic F68. Damage to cells was quantified through a decrease in the steady state concentration of the biomass in the photobioreactor. For a given aeration rate, the steady state biomass concentrati...

Axial-flow pumps, in addition to providing high anti-cavitation properties, must have anti-erosion properties ensure the required lifetime of pump. Erosion damage surfaces occurs when net positive suction head (NPSH) significantly exceeds its critical value. The object study this article is axial-flow pump with a specific speed 600 two alternatives: № 1 and 2. By analysis flow impeller blade sy...

This paper describes the shape optimization of impeller blades for a anti-heeling bidirectional axial flow pump used in ships. In general, a bidirectional axial pump has an efficiency much lower than the classical unidirectional pump because of the symmetry of the blade type. In this paper, by focusing on a pump impeller, the shape of blades is redesigned to reach a higher efficiency in a bidir...

Sewage water pumps very often are equipped with impellers featuring a small number of blades which therefore provide big cross sections of the flow channel. Single-blade impellers comprise the smallest possible number of blades and are known as non-clogging pumps. But severe disadvantages occur during operation, because the timevariant flow in such pumps results in periodic unsteady flow forces...

Although the mathematics that define the operation of an impeller can be complex (it is the stuff of Bernoulli and Euler), its purpose is straight forward. An impeller is designed to impart energy to a fluid so that it will flow or, if it is already flowing, undergo some increase in its elevation or pressure. It accomplishes this by increasing the fluid’s velocity as it travels through its vane...

This paper designed a centrifugal shellfish seeding device with conical disc structure to improve the efficiency and uniformity of device. The dynamic model seedling moving on disk is established, main parameters affecting seedling’s movement characteristics are determined as cone angle impeller, speed offset blade. Using EDEM software seedlings blanking rate influencing factors, single factor ...