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Clarify Valve coefficient vs function

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Bryan W. Weber 2017-06-13 18:43:57 -04:00 • committed by Ray Speth
parent fec6c34ed8
commit 35ac1acfa8
1 changed files with 12 additions and 8 deletions
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20
interfaces/cython/cantera/reactor.pyx
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@ -732,14 +732,18 @@ cdef class Valve(FlowDevice):
.. math:: \dot m = K_v*(P_1 - P_2)
if :math:`P_1 > P_2.` Otherwise, :math:`\dot m = 0`.
However, an arbitrary function can also be specified, such that
where :math:`K_v` is a constant set by the `set_valve_coeff` method.
Note that :math:`P_1` must be greater than :math:`P_2`; otherwise,
:math:`\dot m = 0`. However, an arbitrary function can also be specified,
such that
.. math:: \dot m = F(P_1 - P_2)
.. math:: \dot m = f(P_1 - P_2)
if :math:`P_1 > P_2`, or :math:`\dot m = 0` otherwise.
It is never possible for the flow to reverse and go from the downstream
to the upstream reactor/reservoir through a line containing a `Valve` object.
where :math:`f` is the arbitrary function that returns the mass flow rate given
a single argument, the pressure differential. See the documentation for the
`set_valve_coeff` method for an example. Note that it is never possible for
the flow to reverse and go from the downstream to the upstream
reactor/reservoir through a line containing a `Valve` object.
`Valve` objects are often used between an upstream reactor and a
downstream reactor or reservoir to maintain them both at nearly the same
@ -764,8 +768,8 @@ cdef class Valve(FlowDevice):
rate [kg/s] given the pressure drop [Pa].
>>> V = Valve(res1, reactor1)
>>> V.set_valve_coeff(1e-4)
>>> V.set_valve_coeff(lambda dP: (1e-5 * dP)**2)
>>> V.set_valve_coeff(1e-4) # Set the value of K to a constant
>>> V.set_valve_coeff(lambda dP: (1e-5 * dP)**2) # Set the value of K to a function
"""
cdef Func1 f
if isinstance(k, _numbers.Real):