typeRoughness
Real type for roughness of a pipe
A type of Modelica.Icons.TypeReal.
Information
This Real type defines the absolute roughness of the inner surface of a pipe or fitting, i.e., the absolute average height of surface asperities. It has usually to be estimated. In [Idelchik 1994, pp. 105-109, Table 2-5; Miller 1990, p. 190, Table 8-1] many examples are given. As a short summary:
| Type of pipe | Roughness | |
| Smooth pipes | Drawn brass, copper, aluminium, glass, etc. | 0.0025 mm |
| Steel pipes | New smooth pipes | 0.025 mm |
| Mortar lined, average finish | 0.1 mm | |
| Heavy rust | 1 mm | |
| Concrete pipes | Steel forms, first class workmanship | 0.025 mm |
| Steel forms, average workmanship | 0.1 mm | |
| Block linings | 1 mm | |
References
- Idelchik I.E. (1994):
- Handbook of Hydraulic Resistance. 3rd edition, Begell House, ISBN 0-8493-9908-4
- Miller D. S. (1990):
- Internal flow systems. 2nd edition. Cranfield:BHRA(Information Services).
Attributes
| Name | Value |
|---|---|
| quantity final | "Length" |
| unit final | "m" |
| displayUnit | "mm" |
| min | 0 |