Functions
Tank	_tank (bool by_level)
	_state (Tank tank, float fill)
None	test_the_dry_fraction_is_the_wall_above_the_liquid ()
None	test_the_ullage_loses_heat_to_the_dry_wall_only ()
None	test_on_in_the_cockpit_off_in_the_study ()

Variables
float	PSI = 6894.757293168361

Detailed Description

An ullage cools against the wall it touches: the dry wall above the liquid.

A tank's ``wall_conductance`` is the whole tank's hA (a per-litre default, or the
still-gas film over the full inner surface). Applied to the ullage at every
fill, it let a 0.8 L ullage on a 95 % full LOX tank exchange heat with all
fifteen litres of cold wall: a freshly pressed tank sat in Ready fell 548 -> 260
psig in six seconds, where the stand takes something like thirty.
``Tank(wall_by_level=True)`` (``Setup.ullage_wall_by_level``) scales it by the
dry share of the wall. Checked against the geometry, and against the old
behaviour where it is off.

Function Documentation

◆ _state()

test_ullage_dry_wall._state	(	Tank	tank,
		float	fill )

protected

Definition at line 38 of file test_ullage_dry_wall.py.

Referenced by test_the_dry_fraction_is_the_wall_above_the_liquid(), and test_the_ullage_loses_heat_to_the_dry_wall_only().

◆ _tank()

Tank test_ullage_dry_wall._tank ( bool by_level )

protected

Definition at line 25 of file test_ullage_dry_wall.py.

Referenced by test_the_dry_fraction_is_the_wall_above_the_liquid(), and test_the_ullage_loses_heat_to_the_dry_wall_only().

◆ test_on_in_the_cockpit_off_in_the_study()

None test_ullage_dry_wall.test_on_in_the_cockpit_off_in_the_study ( )

Definition at line 75 of file test_ullage_dry_wall.py.

◆ test_the_dry_fraction_is_the_wall_above_the_liquid()

None test_ullage_dry_wall.test_the_dry_fraction_is_the_wall_above_the_liquid ( )

Definition at line 49 of file test_ullage_dry_wall.py.

References _state(), and _tank().

◆ test_the_ullage_loses_heat_to_the_dry_wall_only()

None test_ullage_dry_wall.test_the_ullage_loses_heat_to_the_dry_wall_only ( )

With nothing else exchanging, the ullage's energy rate is the wall term: on, it is
the off value times the dry fraction, exactly.

Definition at line 63 of file test_ullage_dry_wall.py.

References _state(), and _tank().

Variable Documentation

◆ PSI

float test_ullage_dry_wall.PSI = 6894.757293168361

Definition at line 22 of file test_ullage_dry_wall.py.

Functions

Variables