Nu: Nusselt number

.get_nu(T_leaf, surface, pars, unitless)

Arguments

T_leaf: Leaf temperature in Kelvin
surface: Leaf surface (lower or upper)
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

The Nusselt number depends on a combination how much free or forced convection predominates. For mixed convection:

$$Nu = (a Re ^ b) ^ {3.5} + (c Gr ^ d) ^ {3.5}) ^ {1 / 3.5}$$

Symbol	R	Description	Units	Default
$a, b, c, d$	`a, b, c, d`	empirical coefficients	none	calculated
$Gr$	`Gr`	Grashof number	none	calculated
$Re$	`Re`	Reynolds number	none	calculated

Examples


library(tealeaves)

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

T_leaf <- set_units(298.15, K)

tealeaves:::.get_nu(T_leaf, "lower", c(cs, ep, lp), FALSE)
#> 62.18211 [1]