Sentence examples for minimum impeller speed from inspiring English sources
The minimum impeller speed required for the gas induction (Ncr) in hollow shaft impellers can be predicted; the minimum impeller speed required for surface aeration (Ns) can also be predicted.
In particular, it is important to know the minimum impeller speed (Njs) that guarantees the suspension of all particles.
The aim was to determine which configuration resulted in maximum particle suspension and local gas hold-up while using the minimum impeller speed and power consumption.
A novel experimental method (the "steady cone radius method", SCRM) is proposed to determine experimentally the minimum impeller speed at which solids are completely suspended.
The mixing time has been measured by conductivity measurements using a pulse technique, whereas the minimum impeller speed for the complete drawdown of floating solid particles, NJS, was determined using Joosten visual method.
In the literature on mechanically agitated solid liquid systems, several methods are described to estimate the minimum impeller speed Njs at which all particles are suspended, but few studies have been devoted so far to their critical comparative assessment [67].
Instead of comparing impellers at a given rotational speed or a given power input, they are compared at their respective minimum impeller rotational speed that leads to a complete microcarrier suspension, i.e. at their respective just-suspended speed Njs.
The culture was supplied with 400 ml/min filtered air and the dissolved oxygen tension maintained at a minimum of 35% by variation in the impeller speed; pH was maintained at 5.0 by addition of 25% w/v potassium hydroxide; foaming was controlled with 0.01% v/v Acepol-83E (Emerald Foam Control, Hamburg).
They decreased with increasing impeller speed.
In addition, less impeller power was consumed by punched rigid-flexible impeller compared with rigid impeller and rigid-flexible impeller at the same impeller speed.
