test_wall Namespace Reference

Classes
class	TestCapacity
class	TestExchange
class	TestMassFromGeometry
class	TestTheIcicleQuestion

Functions
LineWall	a_line (float mass=0.4, float length=0.5, float bore=0.0109)
None	test_the_wall_uses_the_same_laminar_limit_as_friction ()

Variables
	N2 = dict(density=50.0, viscosity=1.29e-5, conductivity=0.0185, heat_capacity=1080.0)

Detailed Description

Phase 15: the heat a line's own metal gives the gas flowing through it.

Every component in this model was adiabatic, which is the assumption a stand
disproves in the most visible way available: run a blowdown and frost, then
icicles, form on the fittings downstream of the regulator. Frost on the metal
is not decoration -- it is the evidence that the metal got cold, and metal only
gets cold by giving its heat to something. That something is the gas.

What is tested here is the giving, not the sitting. A line that has been loaded
for an hour is colder than one loaded a minute ago, and none of that is modelled
on purpose: predicting it needs an ambient film, an insulation state and a clock,
to arrive at a starting temperature that the fluid standing in the line already
tells us.

Function Documentation

a_line()

LineWall test_wall.a_line	(	float	mass = 0.4,
		float	length = 0.5,
		float	bore = 0.0109 )

Definition at line 29 of file test_wall.py.

Referenced by test_wall.TestCapacity.test_capacity_scales_with_mass(), test_wall.TestExchange.test_cold_wall_cools_warm_gas(), test_wall.TestExchange.test_gas_never_overshoots_the_wall(), test_wall.TestExchange.test_heat_agrees_with_the_temperature_rise(), test_wall.TestExchange.test_laminar_uses_a_fixed_nusselt(), test_wall.TestExchange.test_missing_property_is_not_a_crash(), test_wall.TestExchange.test_more_flow_means_less_warming_per_kilogram(), test_wall.TestExchange.test_more_metal_area_means_more_pickup(), test_wall.TestExchange.test_no_flow_no_heat(), test_wall.TestExchange.test_reverse_flow_is_treated_by_magnitude(), test_wall.TestTheIcicleQuestion.test_the_lines_own_metal_is_not(), test_wall.TestTheIcicleQuestion.test_the_metal_runs_out(), test_the_wall_uses_the_same_laminar_limit_as_friction(), and test_wall.TestExchange.test_warm_wall_warms_cold_gas().

test_the_wall_uses_the_same_laminar_limit_as_friction()

None test_wall.test_the_wall_uses_the_same_laminar_limit_as_friction

(

)

One transition, not two. Friction switched at 2040 and the Nusselt
number at 2300, so a line between them was turbulent to one correlation
and laminar to the other.

Definition at line 245 of file test_wall.py.

References a_line(), and at().

Variable Documentation

N2

test_wall.N2 = dict(density=50.0, viscosity=1.29e-5, conductivity=0.0185, heat_capacity=1080.0)

Definition at line 34 of file test_wall.py.