.get_nu {tealeaves}

Nu: Nusselt number

Description

Nu: Nusselt number

Usage

.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.

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

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_nu(T_leaf, "lower", c(cs, ep, lp), FALSE)