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
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.
On page N-10, equation 10 at the bottom of the page, the appearance of
"k" in the denominator should read:
"k2". After this correction, Equation 10
(1+f) = 890 * d4 / k2 . (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.
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:
# # #
Copyright (c) 1998 Faast Software. All rights Reserved.