Equivalent diameter

Reference data et engineering information about equivalent diameter pour fluid mechanics applications.

equivalentdiameter

Overview

Equivalent diameter is the diameter of a circular duct that gives the same pressure drop per unit length as a rectangular or non-circular duct for the same flow rate. For rectangular ducts, the hydraulic diameter $D_h = \frac{2ab}{a+b}$ is commonly used as an approximation.

Data Table

16 lignes

Hydraulic and equivalent circular diameters for rectangular ducts (equal friction method)
Side a(mm)	Side b(mm)	Hydraulic Diameter(mm)	Equivalent Circular Diameter(mm)
100	100	100	100
150	100	120	115
200	100	133	127
200	150	171	162
250	100	143	135
250	150	188	178
300	150	200	189
300	200	240	226
400	200	267	251
400	250	308	289
500	250	333	313
500	300	375	351
600	300	400	375
600	400	480	449
800	400	533	499
1000	500	667	623

Source: engineeringtoolbox.com

Notes

Values are at standard conditions unless otherwise noted
Always verify values for critical applications

References

Original Source

Source: engineeringtoolbox.com