R/energybalance_functions.R
heat_transfer_coefficient.RdThe function estimates the heat transfer coefficient for various taxa based on empirical measurements (Mitchell 1976) .
heat_transfer_coefficient(u, D, K, nu, taxon = "cylinder")numeric air velocity (m s-1).
numeric characteristic dimension (e.g., diameter or snout-vent length) (meters).
numeric thermal conductivity of air (W K-1 m-1), can calculate using DRYAIR or WETAIR.
numeric kinematic viscosity of air (m2 s-1), can calculate using DRYAIR or WETAIR.
character which class of organism, current choices: "sphere", "cylinder", "frog", "lizard_surface", "lizard_elevated", "flyinginsect", "spider".
"cylinder" assumes 40 < Re < 4000. "lizard_surface" and "lizard_elevated" assume the lizard is prostrate on and elevated above the surface, respectively. The values are the average for lizards parallel and perpendicular to the air flow.
numeric heat transfer coefficient, H_L (W K-1 m-2).
Mitchell JW (1976). “Heat transfer from spheres and other animal forms.” Biophysical Journal, 16(6), 561-569. ISSN 0006-3495, doi:10.1016/S0006-3495(76)85711-6 .
Other biophysical models:
Grashof_number_Gates(),
Grashof_number(),
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(),
saturation_vapor_pressure(),
saturation_water_vapor_pressure()
heat_transfer_coefficient(u = 0.5,
D = 0.05,
K = 25.7 * 10^(-3),
nu = 15.3 * 10^(-6),
taxon = "cylinder")
#> [1] 9.936011