The discussion revolves around calculating the internal pressure of a tube based on the flow rate of water exiting the tube. Participants explore the necessary parameters and assumptions required for such a calculation, including tube dimensions, material properties, and flow conditions. The context includes theoretical and practical considerations related to fluid dynamics.
Participants express differing views on the sufficiency of the provided information for calculating internal pressure. While some believe that assumptions can lead to an approximate calculation, others highlight the need for more specific data and clarity regarding the system's configuration. The discussion remains unresolved regarding the exact method and assumptions necessary for an accurate calculation.
Limitations include the lack of information on the flow rate entering the tube, the need for assumptions about fluid properties, and the potential impact of elevation changes on pressure calculations.
You said you don't know the flow rate and then that you do. Which is it? More to the point: do you have a complete picture of the system configuration? If not, exactly what do you know and not know?PaulB said:I have pump of unknown flowrate pumping water through a tube of length L and diameter D. I know that the flowrate of water exiting the tube is X mL/min.
Not with the information provided, no. It could even be zero.PaulB said:I would like to know the internal pressure of the tubing, how can I calculate it? This all occurs at sea level elevation.
I know the flowrate of the water exiting the tubing. I don't have any knowledge of the florwrate of the water entering the tube. All I know is tube length, diameter, water density and atmospheric conditions. Is it possible to determine internal pressure from this?russ_watters said:You said you don't know the flow rate and then that you do. Which is it? More to the point: do you have a complete picture of the system configuration? If not, exactly what do you know and not know?
The flow rates into and out of the tube must be the same due to conservation of mass.PaulB said:I know the flowrate of the water exiting the tubing. I don't have any knowledge of the florwrate of the water entering the tube.
You said this all occurs at sea level - so it's completely horizontal? Do you know the hose material?PaulB said:All I know is tube length, diameter, water density and atmospheric conditions. Is it possible to determine internal pressure from this?
russ_watters said:The flow rates into and out of the tube must be the same due to conservation of mass.
You said this all occurs at sea level - so it's completely horizontal? Do you know the hose material?
I agree with @Dullard that with a few assumptions you can calculate an answer but if it is accurate enough for your needs is another matter.
Dullard said:what are your Length and Flowrate?
Dullard said:what are your Length and Flowrate?
Length is 0.3 m, flowrate is 8 mL/minute. How can I calculate the answer?Dullard said:what are your Length and Flowrate?