# Joule-Thomson expansion of the Bardeen-AdS black holes

## TL;DR

This paper investigates the Joule-Thomson expansion of Bardeen-AdS black holes, analyzing thermodynamic properties, inversion curves, and cooling-heating behavior in the extended phase space.

## Contribution

It provides the first detailed analysis of Joule-Thomson expansion for Bardeen-AdS black holes, including inversion curves and temperature ratios.

## Key findings

- Joule-Thomson coefficient diverges at zero temperature
- Inversion curves are derived from the Joule-Thomson coefficient zero points
- Black holes exhibit a consistent heating process during expansion

## Abstract

The Joule-Thomson expansion process is studied for Bardeen-AdS black holes in the extended phase space. Firstly, we get Joule-Thomson coefficient and find that the divergent point of Joule-Thomson coefficient coincides with the zero point of temperature. The inversion curves are also obtained from the zero point of Joule-Thomson coefficient. Then the minimum inversion temperature and the corresponding mass are obtained. In addition, the ratio between minimum inversion and critical temperature for Bardeen-AdS black holes is also calculated. We obtain the isenthalpic curve in $T$-$P$ graph and demonstrate the cooling-heating region by the inversion curve. An interesting phenomenon we get is that black hole is always in heating process. The same phenomenon can be also obtained from the charged AdS black holes.