#' @export
#'
Grashof<-function(L=1, Ts=25, Ta=20){
# Grashof number
# Source: Blaxter, K. 1989. Energy Metabolism in Animals and Man.
# Gr=agL^3(Ts-Ta)/v^2
# L is the characteristic dimension, usually the vertical dimension. For reference,
# a cylinder's characteristic L would be its height, assuming it is standing on its end
# Units of L should be in metres
# This L should be the same L as is used for the convective coefficient calculation
# Ts is the surface temperature
# Ta is the ambient temperature
# v2 is the kinematic viscosity squared
a<-1/273 # (coefficient of thermal expansion of air)
g<- 9.81 # acceleration due to gravity (Units: m/s2)
v<- airviscosity(Ta)
Gr<-a*g*L^3*(Ts-Ta)/v^2
Gr
}
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