  Effects of the dimensionality on the Joule-Thomson expansion are discussed in
detail by considering the case of $d$-dimensional charged AdS black holes.
Specifically, we investigate three important aspects characteristic of the
Joule-Thomson expansion. Namely, the Joule-Thomson coefficient, the inversion
curves and the isenthalpic curves. We utilize two different approaches to
derive the explicit expression of the Joule-Thomson coefficient and show that
both approaches are consistent with each other. The divergent point and the
zero point of the Joule-Thomson coefficient are discussed. The former is shown
to reveal the information of Hawking temperature while the latter is depicted
through the so-called inversion curves. Fine structures of the inversion curves
are disclosed in the cases $d>4$. At low pressure, the inversion temperature
increases with the dimensionality $d$ while at high pressure it decreases with
$d$. The ratio between minimum inversion temperature $T_{min}$ and the critical
temperature $T_c$ is discussed with its explicit expression obtained for $d>4$.
Surprisingly, it is shown that the ratio is not always equal to $1/2$ but
decreases with the dimensionality $d$. Moreover, isenthalpic curves of $d>4$
are shown to expand toward higher pressure when the dimensionality $d$
increases.
