flowtube.tools

Constants and unit conversions.

Constants:

STANDARD_TEMPERATURE_K: Standard temperature in Kelvin.
STANDARD_PRESSURE_Pa: Standard pressure in Pascal.
UNIVERSAL_GAS_CONSTANT: Universal gas constant in kg m2 s-2 K-1 mol-1.
BOLTZMANN_CONSTANT: Boltzmann constant in kg m2 s-2 K-1.
AVOGADROS_NUMBER: Avogadro’s number in mol-1.
P_CF: Conversion factors to Pascal for Torr, bar, mbar, hPa, and Pa pressure units.

Attributes

`STANDARD_TEMPERATURE_K`
`STANDARD_PRESSURE_Pa`
`UNIVERSAL_GAS_CONSTANT`
`BOLTZMANN_CONSTANT`
`AVOGADROS_NUMBER`
`MOLES_PER_SCCM`
`P_CF`

Functions

`permeation_rate_to_MR`(→ float)	Convert permeation rate to mixing ratio.
`vapor_pressure_to_MR`(→ float)	Convert vapor pressure to mixing ratio. Assumes the carrier gas
`T_in_K`(→ float)	Convert Celsius to Kelvin.
`P_in_Pa`(→ float)	Convert pressure to Pa.
`cross_sectional_area`(→ float)	Calculate cross sectional area.
`partial_cylinder_area`(→ tuple[float, float])	Calculate the cross-sectional area and perimeter of a partial
`table`(→ None)	Print a formatted table of variables.

Module Contents

flowtube.tools.STANDARD_TEMPERATURE_K = 273.15[source]

flowtube.tools.STANDARD_PRESSURE_Pa = 101325[source]

flowtube.tools.UNIVERSAL_GAS_CONSTANT = 8.3145[source]

flowtube.tools.BOLTZMANN_CONSTANT = 1.380649e-23[source]

flowtube.tools.AVOGADROS_NUMBER = 6.0221408e+23[source]

flowtube.tools.MOLES_PER_SCCM = 4.461483281705948e-05[source]

flowtube.tools.P_CF[source]

flowtube.tools.permeation_rate_to_MR(flow_rate: float, permeation_rate: float, reactant_gas: str) → float[source]

Convert permeation rate to mixing ratio.

Parameters:

flow_rate (float) – Flow rate through permeation in sccm.
permeation_rate (float) – Permeation rate in ng/min.
reactant_gas (str) – Molecular formula of reactant gas.

Returns:

Reactant volumetric mixing ratio (mol mol-1).

Return type:

float

flowtube.tools.vapor_pressure_to_MR(vapor_pressure: float, P_units: str, system_pressure: float, P_units_system: str) → float[source]

Convert vapor pressure to mixing ratio. Assumes the carrier gas becomes fully saturated with the volatile substance.

Parameters:

vapor_pressure (float) – Vapor pressure.
P_units (str) – Units of vapor pressure.
system_pressure (float) – System pressure.
P_units_system (str) – Units of system pressure.

Returns:

Reactant volumetric mixing ratio (mol mol-1).

Return type:

float

flowtube.tools.T_in_K(T: float) → float[source]

Convert Celsius to Kelvin.

Parameters:: T (float) – Temperature in Celsius.
Returns:: Temperature in Kelvin.
Return type:: float

flowtube.tools.P_in_Pa(P: float, units: str) → float[source]

Convert pressure to Pa.

Parameters:

P (float) – Pressure.
units (float) – Supported pressure units: Torr, bar, mbar, or hPa.

Returns:

Pressure in Pa.

Return type:

float

flowtube.tools.cross_sectional_area(diameter: float) → float[source]

Calculate cross sectional area.

Parameters:: diameter (float) – Diameter.
Returns:: Cross sectional area.
Return type:: float

flowtube.tools.partial_cylinder_area(height: float, width: float) → tuple[float, float][source]

Calculate the cross-sectional area and perimeter of a partial cylinder (“boat”) given its height and width. Assumes the partial cylinder is a segment of a circle with given width as chord length and that the height is less than the diameter of the circle. Calculations based on: https://mathworld.wolfram.com/CircularSegment.html and https://www.vcalc.com/wiki/KurtHeckman/Circle-area-of-an-arc-segment-h.

Parameters:

height (float) – Height of the segment (cm).
width (float) – Chord length of the segment (cm).

Returns:

Outer perimeter (cm). float: Cross-sectional area (cm^2).

Return type:

float

flowtube.tools.table(title: str, var_names: list[str], var: list[float], var_fmts: list[str], units: list[str]) → None[source]

Print a formatted table of variables.

Parameters:

title (str) – Title of the table.
var_names (list) – List of variable names.
var (list) – Variable values.
var_fmts (list) – List of formats for each variable.
units (list) – List of units for each variable.

Returns:

None