Fig. 3

Normalized diffusion coefficient D/D ₀, computed with Eqs. (23) and (25), for A-type particles vs. intermolecular average distance d of B-type particles (expressed in adimensional units). The B-type particles interact through a dipolar potential \(U(r)={\mathcal {C}}_{Dip} r^{-3}=\bar {\mathcal {C}}_{Dip}(r/R)^{-3}\). Conventions on adimensional units are the same of Fig. 1. The curves refer to different choices of the friction coefficient Γ and of the strength \(\bar {\mathcal {C}}_{Dip}\) of the potential energy: \(\Gamma =0.05 \,\,\text {and}\,\, \bar {\mathcal {C}}=10^{4}\) (blue continuous line), \(\Gamma =0.05\,\,\text {and}\,\,\bar {\mathcal {C}}=10^{6}\) (orange dot-dashed line), \(\Gamma =0.01\,\,\text {and}\,\,\bar {\mathcal {C}}=10^{4}\) (green dashed line), \(\Gamma =0.01\,\,\text {and}\,\,\bar {\mathcal {C}}=10^{6}\) (red dotted line). The case of \(\bar {\mathcal {C}}_{Dip}=0\) has been reported (black dot dashed line) for Γ=0.05