Dear all,
What is the mixing energy in (watt/volume of slurry) in order to keep a slurry stored in a tank in suspension? I assume that this mixing energy depends on the % of dry solids in the slurry since it affects the coefficient of rigidity. Does it depend on other parameters? If yes, is it possible to provide me with data or direct me to references that contain such data that show how this mixing energy changes as other parameters change? I have a typical value for mixing energy but it is in (watt/cubic meter of sludge) and I do not know if I can use that for a slurry since slurry has a higher wt% of water content and I do not know how this would affect the mixing energy? What would be a typical efficiency value for an external slurry mixing pump? Any help would be appreciated.
Best,
Simon Sakhel
Have a look at papers on similar subjects in the mining fields, especially gold mining CIP or CIL processing. Much depends on particle size profiling and especially the self supporting effect of high fines levels.
You can keep the slurry in suspension, provided the ingredients are soluble. Otherwise, you hav to devise a stirrer, which can operate periodically, with automatic timing gap setting electronically .
Years ago I have studied adaptive control and energetic optimization of aerobic fermenters, having both air flow and agitation speed as manipulated variables. The power dissipated by agitation was accessed by a torque meter inserted at the impeller shaft. The parameters from the (O2 mass-transfer) KLa correlation were successfully estimated using sinusoidal excitation of air flow and agitation speed, through the recursive least squares algorithm with forgetting factor. The (adaptive) control algorithm compared favourably with PID. This investigation was reported at the following MSc Thesis:
Thesis Controlo do Oxigénio Dissolvido em Fermentadores para Minimi...
- Badges
- Science topic
- Similar topics
- Chemistry, Organic
- Organic