Читать книгу Agitator Design for Gas-Liquid Fermenters and Bioreactors - Gregory T. Benz - Страница 21

As described in Chapter 6, D/T has effects on power, performance, and gassing factors (gassing factor is the ratio of power draw in the gassed condition to that in the ungassed condition). For example, we have found that designs requiring a D/T of more than 1.0 are unlikely to be successful. In general, smaller D/T ratios have less impact of gas flow changes on power draw than large ones, but create a less uniform bubble size and may be difficult to design mechanically. Also, the need for internal heat transfer surfaces may limit the maximum D/T.

If the chosen shaft speed causes problems with gassing factors or mechanical interference, go back and choose a different shaft speed. If it is OK, go to the next step.