Pipe flow velocity calculation
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I would like to ask fellow professionals: In a given application, there is a liquid storage tank on the second floor. A DN80 rigid pipe is connected to the bottom of this tank and leads down to the first floor. The fluid involved is nitrotoluene (with a purity of 97%) along with waste sulfuric acid, and the temperature is 50°C. The flow takes place by gravity from the second floor to the first floor; the height between the floors is 6 meters. What is the flow velocity?
What is the flow rate? Generally, the pipe diameter is determined based on the flow rate; for gravity flow, a recommended flow velocity of 0.3~0.6 m/s is used. The Bernoulli equation can be employed to make an approximate calculation for LZ
The situation is as follows: the requirement at the site is a processing capacity of 10 m³/h. We used DN80 pipes, which results in a flow velocity of 0.55 m/s in those pipes. However, we are not sure what the actual flow velocity is for DN80 pipes under such operating conditions
The actual flow velocity cannot be calculated; it is influenced by various factors such as the viscosity and density of the medium, the roughness of the pipe walls, the frictional losses in straight sections of the pipe, and local resistance, making it difficult to determine