Is dynamic head loss considered in the calculation of pressure drop?
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For example, if a straight pipe has a length of 20 m, an inner diameter of 200 mm, and a flow velocity of 20 m/s, then after passing through an eccentric reducing fitting, it becomes a pipe with an inner diameter of 100 mm and a length of 20 m; the fluid in this pipe is superheated steam at 400°C and 3.5 MPa. Need the pressure drop?
The flow of the liquid phase can be ignored, while that of the gas phase cannot; this is generally referred to as dynamic head. In the original poster’s question, it’s better not to include the dynamic head; compared to a pressure drop of just 3.5 MPa, this value can be ignored.
I don’t understand either; thanks for the explanation from above
The main plant is only 40 meters long, so the pressure loss can be ignored; however, if the pipeline is very long, pressure loss must be taken into account.
The resistance caused by the dynamic head cannot be ignored even in the liquid phase. Do you know how long the pipeline is? For long pipelines, any head loss must be taken into consideration. Dynamic head depends mainly on the flow velocity of the fluid as well as the properties of the fluid itself, such as viscosity, and these factors need to be considered together.