Describing the temperature change associated with the throttling process, FTP, name this effect, which describes the adiabatic expansion of real gases and is named for two 19th century British scientists.
Thermodynamically this effect's namesake coefficient is the partial derivative of temperature with respect to pressure at constant enthalpy.  Though not true for hydrogen and helium, its coefficient is generally positive at room temperature.  Due to this effect, liquefaction is possible in the Linde refrigerator.  Describing the temperature change associated with the throttling process, FTP, name this effect, which describes the adiabatic expansion of real gases and is named for two 19th century British scientists.
Thermodynamically this effect's namesake coefficient is the partial derivative of temperature with respect to pressure at constant enthalpy.  
Joule-Thomson effect or Joule-Kelvin effect