Stirred tank reactors are one of the most commonly used equipments in industry for achieving mixing and reaction. Flow fields in a stirred reactor are obtained via computational fluid dynamics. In this work CFD is used for the simulation of a reactive flow process consisting of a second order reaction. The extent of reaction is found to depend on impeller speed and its position from the bottom ...

A CMOS LC-tank VCO and phase-shifting network are described for a direct-conversion receiver of IEEE 802.11a. The direct-conversion receiver is configured to have sub-harmonic mixing structure which requires multi-phase local oscillator (LO) signals spaced by 45°. A poly-phase filter with 3and 4-stage RC networks generates multi-phase LO signals whose amplitude imbalance is removed by cascaded ...

Background The commercial success of mammalian cell-derived recombinant proteins has fostered an increase in demand for novel single-use bioreactor (SUB) systems, that facilitate greater productivity, increased flexibility and reduced costs. Whilst maintaining auspicious mixing parameters, these systems exhibit fluid flow regimes unlike those encountered in traditional glass/stainless steel bio...

The liquid level control in Coupled Tank System is a basic problem in process industries. Many times the liquids will be processed by chemical or mixing treatment in the tanks, but always the level of fluid in the tanks must be controlled and the flow between tanks must be regulated in presence of non-linearity, disturbance and time varying system parameters. The control of liquid level in tank...

In the mid-1990s, a groundwater plume of uranium (U) was detected in monitoring wells in the B-BX-BY Waste Management Area at the Hanford Site in Washington. This area has been used since the late 1940s to store high-level radioactive waste and other products of U fuel-rod processing. Using multiple-collector ICP source magnetic sector mass spectrometry, high-precision uranium isotopic analyses...

The Arkansas recommendation for Heliothine control is to use the higher recommended rates when a cotton production area is under heavy Heliothine pressure (Greene, 2003). However, Heliothine resistance to pyrethroid insecticides has been documented several times in the past few years (Payne et al., 2001; Williams,1999). Tank mixing pyrethroids with non-pyrethroids has been shown to be effective...

In order to enhance the fluid mixing in stirred tank and reduce power consumption under condition of full baffle, a sinusoidal sawtooth baffle was established present study. Based on Eulerian–Eulerian method, numerical simulation mixed flow conducted, reliability method verified by means PIV experiments. The different structural characteristics standard sine were compared, explore effect modifi...

Forced precipitation of struvite (MgNH4PO4*6H2O) has been demonstrated to be an effective method to reduce dissolved reactive phosphorus (DRP) from swine manure. The development of a robust and flexible continuous flow struvite precipitation reactor is essential to the application of this method to modern livestock operations. Swine manure generally requires pH adjustment, magnesium amendment a...

Abstract The use of a liquid level sensor made it possible to measure changes in gas hold-up over time stirred tank during unsteady mixing. These results were subjected Fourier series analysis and model was proposed. It allowed one determine the value hold-up, which can be useful for characterizing mixing as comparison steady characteristic frequency also determined, corresponds about twice osc...

The detection of compartments and dead zones as well the estimation mixing efficiency in stirred tanks are vital interest for a variety biochemical chemical processes. Here, numerically derived time-dependent 3D fluid velocity fields tank reactor computed using Lattice Boltzmann Method. Mixing is analysed by means Lagrangian Coherent Structures which allow to unravel states complex flows. This ...