MartinLe
Civil/Environmental
- Oct 12, 2012
- 394
Hello all, at a wastewater treatment plant a static mixer will be used to mix a thin suspension (~1m³/h, <2% solids) into the wastewater stream (~300m³/h). If possible I want to know the magnitude of the headloss of my mixer. 100mbar? 1 bar? 5?
DN350 pipe.
I don't yet have hard numbers for the mixing quality required, since the mixer is upstream of a stirred tank I don't think I need to achieve a very high quality (whatever that means). My thinking is that a huge determining factor (alongside final quality) will be the ratio between the two flows.
In mixing (basically) water into water, a helical mixer is used - correct?
Edit to add:
Perry states that headloss of static mixers is usually given as a factor K, ration between headloss mixer and headloss empty pipe. K is between 6 and "several hundred". At my flowrates, headloss of 1m pipe is ~0.2 mbar I would expect single digit mbar headloss for my mixer - correct?
DN350 pipe.
I don't yet have hard numbers for the mixing quality required, since the mixer is upstream of a stirred tank I don't think I need to achieve a very high quality (whatever that means). My thinking is that a huge determining factor (alongside final quality) will be the ratio between the two flows.
In mixing (basically) water into water, a helical mixer is used - correct?
Edit to add:
Perry states that headloss of static mixers is usually given as a factor K, ration between headloss mixer and headloss empty pipe. K is between 6 and "several hundred". At my flowrates, headloss of 1m pipe is ~0.2 mbar I would expect single digit mbar headloss for my mixer - correct?