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The throttling process of the Kerr-Newman-anti-de Sitter (KN-AdS) black holesis systematically studied in the extended phase space. In this framework, thecosmological constant is interpreted as a varying thermodynamic pressure, andthe black hole mass is identified with enthalpy. The throttling process isessentially an isenthalpic (i.e., constant-mass) process for the KN-AdS blackholes. The Joule-Thomson coefficient, inversion temperature, inversion curve,and isenthalpic curve are investigated in order, with both analytical andnumerical methods. It is found that there are no maximum inversiontemperatures, but only minimum ones that are around one half of the criticaltemperatures of the KN-AdS black holes. Two characteristic masses are alsodiscussed to show the detailed features in the throttling behaviors of theKN-AdS black holes.

On the throttling process of the Kerr-Newman-anti-de Sitter black holes in the extended phase space