Physics

Focus: Video—Cease and Go Droplets

July 12, 2019• Physics 12, 80

Liquid droplets bouncing on a vibrating liquid floor can execute a shocking cycle, alternating between transferring and standing nonetheless.

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R. N. Valani et al., Phys. Rev. Lett. (2019)

Dancing drops. Bouncing droplets on a vibrating floor can execute a stop-and-go cycle. (See video beneath.)

Figure caption

R. N. Valani et al., Phys. Rev. Lett. (2019)

Dancing drops. Bouncing droplets on a vibrating floor can execute a stop-and-go cycle. (See video beneath.)×

Vibrating a container of silicone oil at about 80 Hz permits droplets of the liquid to bounce repeatedly on the floor and work together with the waves they generate. These interactions can propel the droplets throughout the floor, a phenomenon referred to as strolling. Now Rahil Valani and colleagues from Monash College in Australia have proven that making use of two frequencies concurrently results in new and extra complicated actions, similar to stop-and-go movement and transitions between a “crystal” and a “gasoline” of walkers. Such conduct is of curiosity partly as a result of the particle-wave interplay mimics a number of quantum phenomena.

R. N. Valani et al., Phys. Rev. Lett. (2019)

With the liquid being shaken at each 80 Hz and 39.5 Hz, silicone oil droplets stroll throughout the vibrating floor, then out of the blue cease for a second earlier than regaining their stride.

Within the stop-and-go case, the droplets alternate between stationary bouncing and random scurrying. To generate this conduct, the researchers set the vibration frequencies to 80 Hz and 39.5 Hz, in order that the decrease frequency is a bit lower than half of the higher frequency. In consequence, the section distinction between the 2 waves adjustments slowly over time and produces movement when it’s inside a sure vary and stopping when exterior that vary. By tuning the decrease frequency in the direction of 40 Hz, the researchers might lengthen the time that the droplets spend within the stopped state.

This analysis is revealed in Bodily Overview Letters.

–David Ehrenstein

David Ehrenstein is the Focus Editor for Physics.

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