dot-get_gr.RdGr: Grashof number
.get_gr(T_leaf, pars, unitless)Leaf temperature in Kelvin
Concatenated parameters (leaf_par, enviro_par, and constants)
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.
A unitless number of class units
$$Gr = t_\mathrm{air} G d ^ 3 |T_\mathrm{v,leaf} - T_\mathrm{v,air}| / D_\mathrm{m} ^ 2$$
| 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 |
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]