Nu: Nusselt number

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]