bhartib

• Bharti, Bharti; Carlson, Andreas & Chan, Tak Shing (2024). Plateau-Rayleigh instability of a soft layer coated on a rigid cylinder. Soft Matter. ISSN 1744-683X. 20(27), p. 5456–5463. doi: 10.1039/d4sm00061g. Full text in Research Archive Show summary

  We study the Plateau–Rayleigh instability of a soft viscoelastic solid layer coated on a rigid cylinder i.e., a soft fibre with a rigid core. The onset of instability is examined using a linear stability analysis. We find that increasing the rigid cylinder radius or the stiffness of the layer reduces the growth rate of the fastest growing mode. For each rigid cylinder radius, a critical elastocapillary number is found below which all wavelengths of disturbances are stable. The critical value for a soft fibre with a thick rigid cylindrical core can be several orders of magnitudes larger than that for a totally soft fibre (no rigid core). This highlights the strong stabilizing effect of the rigid core on the system. Increasing the relaxation timescale of the viscoelastic material also slows down the growth of disturbances, but has no effect on the critical elastocapillary number. Interestingly, the wavelength of the fastest growing mode is independent of the rigid cylinder radius for the purely elastic case.

• Bharti, Bharti; Carlson, Andreas; Chan, Tak Shing & Salez, Thomas (2024). Plateau-Rayleigh instability of a viscous film on a soft fiber. Europhysics letters. ISSN 0295-5075. 145(6). doi: 10.1209/0295-5075/ad2e77. Full text in Research Archive
• Bharti, Bharti; Ferreira, Quentin; Jha, Aditya; Carlson, Andreas; Dean, David S. & Amarouchene, Yacine [Show all 8 contributors for this article] (2024). Singular viscoelastic perturbation to soft lubrication. Physical Review Research (PRResearch). 6(4). doi: 10.1103/PhysRevResearch.6.043060. Full text in Research Archive Show summary

  Soft lubrication has been shown to drastically affect the mobility of an object immersed in a viscous fluid in the vicinity of a purely elastic wall. In this theoretical article, we develop a minimal model incorporating viscoelasticity, carrying out a perturbation analysis in both the elastic deformation of the wall and its viscous damping. Our approach reveals the singular-perturbation nature of viscoelasticity to soft lubrication. Numerical resolution of the resulting nonlinear, singular, and coupled equations of motion reveals peculiar effects of viscoelasticity on confined colloidal mobility, opening the way towards the description of complex migration scenarios near realistic polymeric substrates and biological membranes.

• Bharti, Bharti; Sarkar, Sankar; Ohshima, Hiroyuki & Gopmandal, Partha Pratim (2023). Electrophoresis of hydrophobic and polarizable liquid droplets in hydrogel medium. Journal of Molecular Liquids. ISSN 0167-7322. 395, p. 123810–123810. doi: 10.1016/j.molliq.2023.123810. Full text in Research Archive

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• Bharti, Bharti (2024). Singular viscoelastic perturbation to soft lubrication. Full text in Research Archive
• Bharti, Bharti (2023). Pleateau-Rayleigh instability in a soft viscoelastic cylinder with Rigid inner core. Full text in Research Archive
• Bharti, Bharti; Chan, Tak Shing & Carlson, Andreas (2023). Plateau-Rayleigh Instability of a Viscous Film on a Soft Fiber. Full text in Research Archive
• Bharti, Bharti; Carlson, Andreas & Chan, Tak Shing (2023). Plateau-Rayleigh Instability of a Soft Viscoelastic Cylinder with a Rigid Inner Core. Full text in Research Archive
• Bharti, Bharti; Carlson, Andreas & Chan, Tak Shing (2023). Plateau-Rayleigh Instability of a Soft Viscoelastic Cylinder with a Rigid Inner Core. Full text in Research Archive

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