feedtwin.comps.elements.FlexHose Class Reference

Inheritance diagram for feedtwin.comps.elements.FlexHose:

Collaboration diagram for feedtwin.comps.elements.FlexHose:

Public Member Functions
float	pressure_drop (self, float mdot, FlowConditions flow)
dict[str, float]	diagnostics (self, float mdot, FlowConditions flow)
list[Violation]	check (self)
Public Member Functions inherited from feedtwin.comps.base.HydraulicComponent
None	__init__ (self, ComponentInstance instance)
str	id (self)
str	type (self)
float	static_head (self, FlowConditions flow)
float	total_dp (self, float mdot, FlowConditions flow)
float	signal (self, FlowConditions flow, str name, float default=1.0)
bool	isolates (self, Mapping[str, float]|None signals=None)
float|None	flow_ceiling (self, FlowConditions flow)
float|None	pinned_flow (self, float dp_available, FlowConditions flow)
bool	is_choked (self, float dp_available, FlowConditions flow)
int	n_residuals (self)
Sequence[float]	residuals (self, EvalContext ctx)
Mapping[str, float]	outputs (self, EvalContext ctx)
FlowConditions	conditions (self, PortState port, Mapping[str, float] signals)
str	__repr__ (self)

Protected Member Functions
float	_friction_factor (self, float mdot, FlowConditions flow)

Additional Inherited Members
Public Attributes inherited from feedtwin.comps.base.HydraulicComponent
	instance = instance
	p = instance.si_params()
	opt = dict(instance.options)
Static Public Attributes inherited from feedtwin.comps.base.HydraulicComponent
str	inlet_port = "inlet"
str	outlet_port = "outlet"
bool	symmetric = False
	conditions_provider = None

Detailed Description

A flexible hose: rougher than tube, crimped ends, and a bend limit.

Three things separate it from hardline, and all three change the answer:

* **It is rougher.** A smooth-bore liner is close to drawn tube; convoluted
  metal hose is several times worse, because the convolutions are in the
  flow path and not merely in the braid.
* **Its ends are fittings.** Two crimped transitions, which on a short hose
  dominate the loss entirely.
* **It is usually bent.** When ``installed_bend_radius`` is set, friction is
  computed for curved flow through
  ``fluids.friction_factor_curved`` -- and unlike a discrete bend, the whole
  developed length is curved, so this is where that term belongs.

Minimum bend radius is generally what actually constrains a routing, and is
quoted twice: a static limit, and a larger dynamic one for anything that
gimbals, grows thermally or vibrates.

Definition at line 334 of file elements.py.

Member Function Documentation

_friction_factor()

float feedtwin.comps.elements.FlexHose._friction_factor ( self, float mdot, FlowConditions flow )

protected

Definition at line 356 of file elements.py.

References feedtwin.comps.base.HydraulicComponent.opt, p, and feedtwin.comps.base.HydraulicComponent.p.

Referenced by diagnostics(), and pressure_drop().

check()

list[Violation] feedtwin.comps.elements.FlexHose.check

(

self

)

Is the hose routed tighter than it may be bent?

Both limits are checked. The dynamic one is a warning rather than an
error because whether a given hose actually moves in service is a fact
about the installation that the model does not know -- but a run inside
the static limit and outside the dynamic one is exactly the case worth
surfacing rather than silently passing.

Reimplemented from feedtwin.comps.base.HydraulicComponent.

Definition at line 401 of file elements.py.

References _USBD_HandleTypeDef.id, anonymous_namespace{config_broadcast_service_main.cpp}::BoardInfo.id, anonymous_namespace{idle_e2e.cpp}::Check.id, backend.routers.layerx.Job.id, check_t.id, detail::exception.id, engine.layerx.sources.Drawing.id, feedtwin.comps.base.HydraulicComponent.id(), feedtwin.comps.elements.OrificeISO5167.id, feedtwin.comps.gas.GasOrifice.id, feedtwin.comps.manifold.Manifold.id, feedtwin.comps.regulator.Regulator.id, feedtwin.comps.relief.ReliefValve.id, feedtwin.engine.component.InjectorLeg.id, feedtwin.session.core.Session.id, feedtwin.session.hookup.Knob.id, fsw::config::StateDef.id, p, and feedtwin.comps.base.HydraulicComponent.p.

diagnostics()

dict[str, float] feedtwin.comps.elements.FlexHose.diagnostics	(		self,
		float	mdot,
		FlowConditions	flow )

Derived quantities worth reporting: velocity, Reynolds number, K.

Never consumed by a solver. This is what a frame and a report show, and
what makes a result inspectable rather than just a number.

Reimplemented from feedtwin.comps.base.HydraulicComponent.

Definition at line 385 of file elements.py.

References feedtwin.comps.elements._dynamic_head(), _friction_factor(), p, and feedtwin.comps.base.HydraulicComponent.p.

pressure_drop()

float feedtwin.comps.elements.FlexHose.pressure_drop	(		self,
		float	mdot,
		FlowConditions	flow )

Flow-dependent pressure loss [Pa]. Always non-negative.

A *loss*: it opposes the flow, so it lowers the downstream pressure
whichever way the fluid is going. Reverse flow is each component's own
business -- symmetric for a pipe, very much not for a check valve.

Anything that does **not** depend on the direction of flow belongs in
:meth:`static_head`, not here. See that method for why the distinction
is load-bearing rather than tidy.

Reimplemented from feedtwin.comps.base.HydraulicComponent.

Definition at line 379 of file elements.py.

References feedtwin.comps.elements._dynamic_head(), _friction_factor(), p, and feedtwin.comps.base.HydraulicComponent.p.

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The documentation for this class was generated from the following file:

• lib/feedtwin/feedtwin/comps/elements.py