Joule-Thomson expansion of lower-dimensional black holes

Herein, we extend Joule-Thomson expansion to the low-dimensional regime by considering rotating Ba\~nados-Teitelboim-Zanelli (BTZ) metric in ($2+1$)-dimensional space-time. Specifically, properties of three important aspects expansion, including coefficient, inversion curve, and isenthalpic curve were studied. The divergence point coefficient zero Hawking temperature investigated. curves $T--P$ plane obtained, cooling-heating regions determined. Furthermore, minimum was found be zero, black hole becomes an extremal hole. ratio critical temperatures for BTZ holes does not exist, since exhibit behavior pressure ${P}_{c}$, ${T}_{c}$, volume ${V}_{c}$.