Grashof_number: Grashof Number

In TrenchR: Tools for Microclimate and Biophysical Ecology

Grashof Number

Description

The function estimates the Grashof Number, which describes the ability of a parcel of fluid warmer or colder than the surrounding fluid to rise against or fall with the attractive force of gravity. The Grashof Number is estimated as the ratio of a buoyant force times an inertial force to the square of a viscous force \insertCiteCampbell1998TrenchR.

Usage

Grashof_number(T_a, T_g, D, nu)

Arguments

T_a	numeric Air temperature (C).
T_g	numeric ground (surface) temperature (C).
D	numeric characteristic dimension (e.g., body diameter) (meters).
nu	numeric the kinematic viscosity, ratio of dynamic viscosity to density of the fluid (m2 s-1); can calculate from DRYAIR or WETAIR.

Value

numeric Grashof number.

References

\insertAllCited

See Also

Other biophysical models: Grashof_number_Gates(), Nusselt_from_Grashof(), Nusselt_from_Reynolds(), Nusselt_number(), Prandtl_number(), Qconduction_animal(), Qconduction_substrate(), Qconvection(), Qemitted_thermal_radiation(), Qevaporation(), Qmetabolism_from_mass_temp(), Qmetabolism_from_mass(), Qnet_Gates(), Qradiation_absorbed(), Qthermal_radiation_absorbed(), Reynolds_number(), T_sky(), Tb_CampbellNorman(), Tb_Gates2(), Tb_Gates(), Tb_butterfly(), Tb_grasshopper(), Tb_limpetBH(), Tb_limpet(), Tb_lizard_Fei(), Tb_lizard(), Tb_mussel(), Tb_salamander_humid(), Tb_snail(), Tbed_mussel(), Tsoil(), actual_vapor_pressure(), boundary_layer_resistance(), external_resistance_to_water_vapor_transfer(), free_or_forced_convection(), heat_transfer_coefficient_approximation(), heat_transfer_coefficient_simple(), heat_transfer_coefficient(), saturation_vapor_pressure(), saturation_water_vapor_pressure()

Examples

  Grashof_number(T_a = 30,
                 T_g = 35,
                 D  = 0.001,
                 nu = 1.2)

TrenchR documentation built on Sept. 14, 2023, 1:07 a.m.