
Series | Appendix C Fluid Calculations |
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Calculations for Liquid
Use this formula to determine the settings for
and “Other Liquid” selections entered in the Fluid Menu. The liquid cal- culations were taken from Richard W. Miller, Flow Measurement Engi- neering Handbook (Second Edition, 1989).
Density
The liquid density is found using the
G |
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| pc Mw | 0.008 |
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| T f | |||
F | = |
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T | Z 0.773 |
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| 0.01102T | ||||||
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| c | | c |
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| C |
The specific gravity can then be converted into density.
Viscosity
The liquid viscosity is found by Andrade's equation. This uses two vis- cosities at different temperatures to extrapolate the viscosity.
Andrade's equation:
∝ | = AL exp | BL | ||||
T |
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| deg R | |||
To find A and B | ||||||
B | = Tdeg R1Tdeg R 2 ln(∝1 / ∝2 ) | |||||
L |
| Tdeg R 2 − Tdeg R1 | ||||
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AL | = | ∝1 |
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exp(BL / Tdeg R1 ) | ||||||
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The temperatures are all in degrees Rankin. Do not believe the subscript
R means they are reduced temperatures.
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