Abstract
A torque meter has been developed for determining the power consumption in a bench stirred tank. The device has been bonded in the stirrer shaft inside a commercial bench fermentor, in order to avoid frictional losses in the mechanical seal. Power consumption measurements in ungassed and gassed systems were obtained at different agitation and aeration conditions, for Newtonian and non-Newtonian fluids. Also, a “simple modified sulfite method” for volumetric oxygen transfer coefficient (kLa) determination was developed and the experimental data were correlated with the gassed power (Pg) by using well-known correlations presented in the literature.
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