9 research outputs found
Plans for laser spectroscopy of trapped cold hydrogen-like HCI
Laser spectroscopy studies are being prepared to measure the 1s ground state
hyperfine splitting in trapped cold highly charged ions. The purpose of such
experiments is to test quantum electrodynamics in the strong electric field
regime. These experiments form part of the HITRAP project at GSI. A brief
review of the planned experiments is presented.Comment: 4 pages, 4 figures, accepted for publication (NIMB
Plans for laser spectroscopy of trapped cold hydrogen-like HCI
Laser spectroscopy studies are being prepared to measure the 1s ground state
hyperfine splitting in trapped cold highly charged ions. The purpose of such
experiments is to test quantum electrodynamics in the strong electric field
regime. These experiments form part of the HITRAP project at GSI. A brief
review of the planned experiments is presented.Comment: 4 pages, 4 figures, accepted for publication (NIMB
Plans for laser spectroscopy of trapped cold hydrogen-like HCI
Laser spectroscopy studies are being prepared to measure the 1s ground state
hyperfine splitting in trapped cold highly charged ions. The purpose of such
experiments is to test quantum electrodynamics in the strong electric field
regime. These experiments form part of the HITRAP project at GSI. A brief
review of the planned experiments is presented.Comment: 4 pages, 4 figures, accepted for publication (NIMB
Impact of droplets onto surfactant-laden thin liquid films
We study the effect of insoluble surfactants on the impact of surfactant-free droplets on surfactant-laden thin liquid films via a fully three-dimensional direct numerical simulations approach that employs a hybrid interface-tracking/level-set method, and by taking into account surfactant-induced Marangoni stresses due to gradients in interfacial surfactant concentration. Our numerical predictions for the temporal evolution of the surfactant-free crown are validated against the experimental work by Che & Matar (2017). We focus on the 'crown-splash regime', and we observe that the crown dynamics evolves through various stages: from the the growth of linear modes (through a Rayleigh-Plateau instability) to the development of nonlinearities leading to primary and secondary breakup events (through droplet shedding modulated by an end-pinching mechanism). We show that the addition of surfactants does not affect the wave selection via the Rayleigh-Plateau instability. However, the presence of surfactants play a key role in the late stages of the dynamics as soon as the ligaments are driven out from the rim. Surfactant-induced Marangoni stresses delay the end-pinching mechanisms to result in longer ligaments prior to their capillary singularity, while also promoting the spanwise merging between ligaments. In addition, we show that the addition of surfactants leads to surface rigidification and consequently to the retardation of the flow dynamics
Impact of droplets onto surfactant-laden thin liquid films
We study the effect of insoluble surfactants on the impact of surfactant-free droplets on surfactant-laden thin liquid films via a fully three-dimensional direct numerical simulations approach that employs a hybrid interface-tracking/level-set method, and by taking into account surfactant-induced Marangoni stresses due to gradients in interfacial surfactant concentration. Our numerical predictions for the temporal evolution of the surfactant-free crown are validated against the experimental work by Che & Matar (2017). We focus on the 'crown-splash regime', and we observe that the crown dynamics evolves through various stages: from the the growth of linear modes (through a Rayleigh-Plateau instability) to the development of nonlinearities leading to primary and secondary breakup events (through droplet shedding modulated by an end-pinching mechanism). We show that the addition of surfactants does not affect the wave selection via the Rayleigh-Plateau instability. However, the presence of surfactants play a key role in the late stages of the dynamics as soon as the ligaments are driven out from the rim. Surfactant-induced Marangoni stresses delay the end-pinching mechanisms to result in longer ligaments prior to their capillary singularity, while also promoting the spanwise merging between ligaments. In addition, we show that the addition of surfactants leads to surface rigidification and consequently to the retardation of the flow dynamics
Poster: Anatomy of a Crown Splash
International audienceAnatomy of a Crown Splash 3D Direct Numerical Simulations of surfactant-free droplet impacting a surfactant-laden thin liquid layer resulting in a crown splash. Colour indicates surfactant concentration
Impact of droplets onto surfactant-laden thin liquid films
We study the effect of insoluble surfactants on the impact of surfactant-free droplets on surfactant-laden thin liquid films via a fully three-dimensional direct numerical simulations approach that employs a hybrid interface-tracking/level-set method, and by taking into account surfactant-induced Marangoni stresses due to gradients in interfacial surfactant concentration. Our numerical predictions for the temporal evolution of the surfactant-free crown are validated against the experimental work by Che & Matar (2017). We focus on the 'crown-splash regime', and we observe that the crown dynamics evolves through various stages: from the the growth of linear modes (through a Rayleigh-Plateau instability) to the development of nonlinearities leading to primary and secondary breakup events (through droplet shedding modulated by an end-pinching mechanism). We show that the addition of surfactants does not affect the wave selection via the Rayleigh-Plateau instability. However, the presence of surfactants play a key role in the late stages of the dynamics as soon as the ligaments are driven out from the rim. Surfactant-induced Marangoni stresses delay the end-pinching mechanisms to result in longer ligaments prior to their capillary singularity, while also promoting the spanwise merging between ligaments. In addition, we show that the addition of surfactants leads to surface rigidification and consequently to the retardation of the flow dynamics