Question:
When we model a tee junction, if we turn off the branch pipe, should we have a pressure loss for the straight pipe, ie a straight loss?
Answer:
According to Idelchik, Miller and SAE, the straight losses in the case of the branch connection being turned off is zero. However, for Crane type tees there should be a loss.
The image below shows a test exercise for the exact same model only using the four different tee pressure loss relationships.
As we can see, the Crane method produces a pressure loss for the straight whereas all other methods have a zero results as per the literature.
