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(a,b) Numerical simulation results in the synchronous regime (ω = 37.7rad s −1 ). (a) Distribution functions P(t p ) of time lapses t p for different values of the constriction width δ . (b) Distribution functions P(t p ) of time lapses t p for different values of driving frequency ω, with δ = 2.98µm. The results are shown for particles driven in the synchronous regime for ω ≤ 71.4rads −1 , and in the asynchronous regime for larger ω.
Source publication
We combine experiments and numerical simulations to investigate the emergence of clogging in a system of interacting paramagnetic colloidal particles driven against a disordered landscape of larger obstacles. We consider a single aperture in a landscape of immobile silica particles which are irreversibly attached to the substrate. We use an externa...
Contexts in source publication
Context 1
... 3(a,b) display the results from the numerical simulations for fixed obstacles. In Fig. 3(a) we show how the distribution function P(t p ) changes by varying the distance between the obstacles forming the constriction, at fixed driving frequency. As expected, a narrower constriction increases the particle mean passing time. Similar to the experimental data, we also observe a periodic decrease of the distributions followed by a ...
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... shown in Fig. 3(b), the free speed of the paramagnetic particles, proportional to the driving frequency ω in the synchronous regime, strongly influences the distribution of t p . In fact, increasing ω shifts the time lapse distribution towards shorter times, with a decay that may be characterized by an exponential law similar to the experimental results ...
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... no harmonic spring gives a completely unclogged state and a large exponent in the distribution P(t p ), α > 2. Further, as shown in Fig. 4(a), we find that there are no visible plateaus as in Fig. 3. Moreover, smaller spring constants can lead to a more clogged state than higher ones. The latter effect is unexpected, as smaller frequencies could induce longer period of time when the obstacle are more deformed and the width of the opening wider, which should favor unclogging. However, the results obtained in Fig. 4(a) point out to ...
Context 4
... 3(a,b) display the results from the numerical simulations for fixed obstacles. In Fig. 3(a) we show how the distribution function P(t p ) changes by varying the distance between the obstacles forming the constriction, at fixed driving frequency. As expected, a narrower constriction increases the particle mean passing time. Similar to the experimental data, we also observe a periodic decrease of the distributions followed by a ...
Context 5
... shown in Fig. 3(b), the free speed of the paramagnetic particles, proportional to the driving frequency ω in the synchronous regime, strongly influences the distribution of t p . In fact, increasing ω shifts the time lapse distribution towards shorter times, with a decay that may be characterized by an exponential law similar to the experimental results ...
Context 6
... no harmonic spring gives a completely unclogged state and a large exponent in the distribution P(t p ), α > 2. Further, as shown in Fig. 4(a), we find that there are no visible plateaus as in Fig. 3. Moreover, smaller spring constants can lead to a more clogged state than higher ones. The latter effect is unexpected, as smaller frequencies could induce longer period of time when the obstacle are more deformed and the width of the opening wider, which should favor unclogging. However, the results obtained in Fig. 4(a) point out to ...
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