.get_gr {tealeaves}

Gr: Grashof number

Description

Gr: Grashof number

Usage

.get_gr(T_leaf, pars, unitless)

Arguments

T_leaf

Leaf temperature in Kelvin

pars

Concatenated parameters (leaf_par, enviro_par, and constants)

unitless

Logical. Should function use parameters with units? The function is faster when FALSE, but input must be in correct units or else results will be incorrect without any warning.

Details

Gr = t_\mathrm{air} G d ^ 3 |T_\mathrm{v,leaf} - T_\mathrm{v,air}| / D_\mathrm{m} ^ 2

Symbol	R	Description	Units	Default
d	leafsize	Leaf characteristic dimension in meters	m	0.1
D_\mathrm{m}	D_m	diffusion coefficient of momentum in air	m^2 / s	calculated
G	G	gravitational acceleration	m / s^2	9.8
t_\mathrm{air}	t_air	coefficient of thermal expansion of air	1 / K	1 / Temp
T_\mathrm{v,air}	Tv_air	virtual air temperature	K	calculated
T_\mathrm{v,leaf}	Tv_leaf	virtual leaf temperature	K	calculated

Value

A unitless number of class units

Examples

library(tealeaves)

cs <- make_constants()
ep <- make_enviropar()
lp <- make_leafpar()

T_leaf <- set_units(298.15, K)

tealeaves:::.get_gr(T_leaf, c(cs, ep, lp), FALSE)