In the present work, the effects of dual impeller configurations comprising of Rushton turbine (RT) and Concave-bladed disk turbine (CD-6) on the oxygen transfer profile and fermentation performance of kojic acid production by Aspergillus flavus Link 44-1 was investigated. Batch cultivations of A. flavus Link 44-1 were performed in 2 L stirred tank bioreactor. The fermentations were conducted u...

one of the most problems that limits use of turbomachines at high speed applications is cavitation. cavitation can damage casing and blades of turbopump, also can make unstability in system. inducer that was installed in front of main impeller can improve cavitation characteristic of system and increase static pressure just before entrance of centrifugal pump. specially in fuel feed system of l...

The mixing of immiscible oil and water by a pitched blade turbine in cylindrical vessel is studied numerically. Three-dimensional simulations combined with hybrid front-tracking/level-set method are employed to capture the complex flow interfacial dynamics. A large eddy simulation approach, Lilly–Smagorinsky model, simulate turbulent two-phase dynamics at Reynolds numbers $Re=1802{-}18\ 026$ . ...

The changes in chemical production processes, in particular the shift from chemical production to biotechnology, puts more emphasis on shear rate control of mixing devices. At the same time, mixing devices should be highly optimized with respect to power consumption, both for economical reasons and due to the prevention of additional heat-up of the mixing process. In addition, most biotechnolog...

Results on overall pump head and efficiency performance, pressure pulsation high speed camera visualization of flow patterns behavior are presented for different inlet air-water void fractions at a given rotational speed. With the increase decrease rates, size bubbles tend to agglomerate in specific impeller passage locations along blade chord. The starting point breakdown is related strong inw...

with the prolonged use of domestic centrifugal pump, due to erosion, corrosion and an unbalance the sever vibration of the pump are resulted. an erratic sound coming out of pump makes the user uncomfortable. here, tuned vibration absorber (tva) is used as a vibration controlling device. it is designed to reduce the rms velocity below 20% of the circumferential speed, at which the impeller is ba...

In many industries, reducing the size of compression system represents a significant goal for designers. fact, increasing power density compressor actually means lowering production costs. The chief purpose this study is to compare, in terms aerodynamic performances, centrifugal consisting an impeller and volute, innovative concept based on principle two successive impellers designed work count...

To improve the transport performance of a rotodynamic multiphase pump for gas–liquid mixture, we took head and efficiency index at rated flow rate with 15% inlet gas volume fraction as indices, used orthogonal test design method CFD technology to optimize. We selected blade shroud angles leading edge trailing edge, axial length impeller, well incidence angle number diffuser, total five factors ...

When considering the creation of pumps with improved anti-cavitation characteristics, results an in-depth analysis problem pumping viscous liquids at high temperatures are presented. On example technological process evaporation sugar syrup on a film evaporator latest type, occurrence cavitation when was revealed. After analyzing existing machines used for specified operating conditions, critica...