How much pipe length is required for two different liquids to mix thoroughly when they enter the same pipe?
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When two liquids (with a volume ratio of 10:1) flow into a pipe, their flow velocity is 0.45 m/s, the viscosity is approximately 2 mPa·s, the pipe diameter is DN40, and the pressure ranges from atmospheric pressure to 0.02 MPa. How can the length of the pipe required for thorough mixing of these two liquids be calculated? If any fellow travelers know, please help out by providing a calculation formula; it would be great if the source of the formula could also be indicated. Thank you!
Why not use a static mixer? Mixing is completed as soon as the material goes in and comes out
Yes, why not add a static mixer?
Originally, a static mixer was considered, but one end of the material consists of 50% sulfuric acid, which causes overflow; moreover, the overflow pressure is quite low, so there is concern that the material won’t be retained properly. Therefore, a Venturi mixer was considered instead； Since the inlet pressure is only 1.5 kilograms, there is concern that the mixing effect will not be good; therefore, it is planned to add a straight pipe or a bent pipe, but it is not known how long it should be. That’s why there is the request for help as mentioned in the title.
Originally, a static mixer was considered, but one end of the material consists of 50% sulfuric acid, which causes overflow; moreover, the overflow pressure is quite low, so there is concern that the material won’t be retained properly. Therefore, a Venturi mixer was considered instead； Since the inlet pressure is only 1.5 kilograms, there is concern that the mixing effect will not be good; therefore, it is planned to add a straight pipe or a bent pipe, but it is not known how long it should be. That’s why there is the request for help as mentioned in the title.
Originally, a static mixer was considered, but one end of the material consists of 50% sulfuric acid, which causes overflow; moreover, the overflow pressure is quite low, so there is concern that the material won’t be retained properly. Therefore, a Venturi mixer was considered instead； Since the inlet pressure is only 1.5 kilograms, there is concern that the mixing effect will not be good; therefore, it is planned to add a straight pipe or a bent pipe, but it is not known how long it should be. That’s why there is the request for help as mentioned in the title.
Re is too low; if a straight tube is used, it will need to be extremely long~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The viscosity is twice that of water, the density is close to that of water, and Re=0.04×1000×0.45/0.002 – which is quite high
Originally, a pipe mixer was intended to be used, but since one of the media is sulfuric acid, there is overflow from the high-temperature tank and low pressure; there are concerns that the mixture won’t be able to remain there properly； So I want to use a venturi mixer to draw in the material. Since the inlet pressure of the venturi mixer is only 1.5 kilograms, I’m concerned that the mixing effect won’t be good; therefore, I want to add a straight section or a bent tube at the outlet. That’s why I’m asking for help as mentioned in the title – I don’t know how to do the calculations
I misread it; you’re right, Re=18000 now~~~~ In this condition, a 20-fold L/D ratio should suffice for thorough mixing~~~~
Are there any empirical formulas mentioned in the literature? Tell me about it