## Faast-3 Reference Manual Errata # 1

#### Application Note # 2 "Sprinkler and Nozzles"

#### Application Note # 3, "Modeling Compressible Flow in Pipes"

Errata sheet revised 23 March 1998
**
1. Overview. **

It has been brought to our attention that there are two errors in the
Faast-3 Reference Manual, Appendix N (Application Notes).

**a.** In Note # 2, "Nozzles, Sprinklers, Spray Heads and Elastic Demands",
pages N-6 through N-10: on page N-10, there is an error in a formula.
There is also a point in need of clarification.

**b.** In Note # 3, "Modeling Compressible Flow in Pipes", pages N-11 through
N-15: on page N-14 there is a missing minus sign.

2. Erratum

On page N-10, equation 10 at the bottom of the page, the appearance of
`"k"` in the denominator should read:
`"k`^{2}". After this correction, Equation 10
should read:

(1+f) = 890 * d^{4} / k^{2} . (10)

**Clarification:** In equation 10, note that the entire term
`(1+f)` on the left side of the equation is equivalent to
the friction factor used by the `TVALVE` element when that
element is used as a nozzle or other discharge to atmospheric pressure. The
friction portion of pressure drop in the nozzle is represented by the variable
`f` and the velocity portion of pressure drop is represented
by the integer `1`. Input the value of
`(1+f)` as the `TVALVE` friction factor.

3. Erratum

On page N-14, in the "Numeric Example" concerning the fluid viscosity, the
value is missing the minus sign from the power-of-ten exponent. Change the
viscosity to read:

3.8*10^{-7} .

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Copyright (c) 1998 *Faast* Software. All rights Reserved.