The flow pattern of a fluid under the following conditions
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1. The toluene in the high-level tank is fed into the reaction vessel through a DN25 pipeline with the valve fully open. Is the flow state of the toluene laminar or turbulent? 2. The sodium nitrite solution in the dosing tank is added to the reaction vessel through a DN25 pipeline with the valve partially open; is the flow state of the liquid laminar or turbulent? Thank you!
1. The static pressure of toluene in the high-level tank is high enough to result in a low flow velocity of the liquid as it passes through the DN25 pipeline. According to the formula for calculating the Reynolds number, Re = VD/Dv, where V is the flow velocity, D is the diameter of the pipe, and v is the dynamic viscosity of the fluid. At Re4000, the flow state is turbulent. According to this formula, when toluene flows through a DN25 pipeline in a high-level tank, the flow velocity is low, and the flow regime should be laminar. 2. Since the valve is partially open, the flow rate of the sodium nitrite solution through the pipeline increases, but during the dripping process the flow rate is very low; thus it can be considered slow, and as a result the Reynolds number is also low. The flow state of the sodium nitrite solution should therefore be laminar. .
The flow regime should be determined by calculating the Reynolds number
Yes, calculations should normally be carried out. I just want to know that in normal engineering calculations, for situations like the two mentioned above, is it usual to use laminar flow assumptions or turbulent flow assumptions for the calculations?