Gr: Grashof number

Gr: Grashof number

.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.

Value

A unitless number of class units

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

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)
#> 245079.5 [1]