| Autor: |
C L Giusca, I Severn, J Greenwood |
| Rok vydání: |
2008 |
| Předmět: |
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| Zdroj: |
Journal of Physics: Conference Series. 121:152001 |
| ISSN: |
1742-6596 |
| DOI: |
10.1088/1742-6596/121/15/152001 |
| Popis: |
The effective area of a hydraulic pressure balance is typically characterised using the cross-floating technique, where the pressure balance is compared against a standard instrument. This method usually involves operating both instruments in the pressure transmitting fluid of the standard, even if the tested device is normally operated with a different fluid. We describe novel experiments to determine the influence of various commonly used oils on the measured effective area of the balances. Measurements were made using five different oils in the pressure range 28 MPa to 200 MPa. Our results show that in some cases the contribution to the effective area when using different oils was nearly 60 ppm. Although a difference in the effective area with respect to the liquid viscosity was intuitively expected, the results appear to show a greater dependency on the liquid density, which contradicts the current assumptions used to formulate the theory describing the pressure balance. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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