#' Calculate the thermal conductivity of air, W/(m K).
#'
#' Calculate the thermal conductivity of air, W/(m K).
#'
#' @param Tk value of air temperature in Kelvin.
#'
#' @return Thermal conductivity of air, W/(m K).
#'
#' @author Ana Casanueva (05.01.2017).
#' @details Reference: BSL, page 257.
##############################################################################
thermal_cond <- function(Tk){
# Constants
m.air <- 28.97
r.gas <- 8314.34
r.air <- r.gas / m.air
cp <- 1003.5 # heat capaticy at constant pressure of dry air
# Calculate the thermal conductivity of air, W/(m K)
therm.con <- (cp + 1.25 * r.air) * viscosity(Tk)
return(therm.con)
}
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