Seeking help with a problem regarding the resistance analysis of smoke ducts
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The vertical flue pipe is connected to the horizontal flue pipe using an elbow. Personally, I feel that the resistance when using two 45° elbows in combination with straight sections to connect to a horizontal section is lower. However, when looking at the resistance coefficients of various elbows, it turns out that using one 90° elbow results in less resistance. The ratio of the elbow radius to the pipe diameter is 1:1; in this case, the resistance coefficient for a 45° elbow is 0.16 ； The drag coefficient of a 90° elbow is 0.25. Has there been any practical analysis in real engineering projects to determine which of these two bending methods results in less resistance?
Give it a push~~~~ Some big shot, please~~~~
According to the information found in the \"Fan Manual,\" replacing 90° elbows with 45° elbows in order to reduce air resistance seems like a measure with very little effect, right? A 45-degree elbow has a resistance coefficient that is half that of a 90-degree elbow. The wind resistance coefficient is related to the radius of the elbow’s center line; the smaller the turning radius of the elbow, the greater the resistance coefficient. Please upload the image for reference only.
Where did the original poster find the resistance coefficient for gas elbows? Could you recommend some relevant materials? What I see are all liquids, and their elbow coefficient is different from that of gases.