I would like to ask an expert: Where can I find the local resistance coefficient for elbows filled with pure air?
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The values found in the hydraulics handbooks and heating engineering handbooks are absurd, and they seem not to be applicable to pure air. Which manual can provide the relevant empirical data? Thank you!
The local resistance coefficient is the ratio of the local resistance generated as fluid flows through equipment and pipe fittings to the corresponding dynamic pressure, and it is a dimensionless value. According to the \"Design Manual for Small and Medium-Sized Cogeneration Plants\", the local resistance coefficient of a 120-degree elbow in air and flue gas ducts is 0.532, while that of a 150-degree elbow is 0.52. Hope this can be useful as a reference! By the way. Is this local drag coefficient highly dependent on the medium? I think it’s mainly a problem with the pipeline structure.
The local resistance coefficient of an elbow is independent of the fluid; it depends only on the elbow’s own structure. The resistance coefficient for standard elbows can be found in various sources, such as manuals on chemical engineering design and pipeline design, as well as textbooks on principles of chemical engineering.
If the resistance at a single elbow is such an important factor, then this pipeline is really strange. If the local drag coefficients found are inconsistent and it isn’t specified exactly how they differ, then such a request for advice is truly insincere.