Hydrodynamic drift ratchet scalability

Herringer, James; Lester, Daniel; Dorrington, G. E.; Rosengarten, Gary; Mitchell, James G.

doi:10.1002/aic.15569

Cited by 4 publications

(7 citation statements)

References 30 publications

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“…This means that a parcel of fluid on the centerline of the pore traverses the length of one repeating ratchet unit over half a period of fluid oscillation [9]. This is consistent with past hydrodynamic drift ratchet studies [9][10][11]17]. Table 2 goes a step further than a simple geometric comparison between pores and shows a functional comparison between what girdle band pores of a diatom in a typical oceanic environment could experience and a previously studied hydrodynamic drift ratchet.…”

Section: Difference In Size Shape and Configuration Of The Poressupporting

confidence: 82%

“…where k B is the Boltzmann constant, T is the temperature, μ is the dynamic viscosity and R is the particle radius. Following earlier studies [9,16,17], the particle-wall interactions are modeled via an elastic ballistic reflection condition. While the detailed particle-wall hydrodynamics are not captured by this boundary condition, we have shown [17] that this qualitatively captures the action of the pore wall in generating rectified particle motion.…”

Section: Particle Drift In a Single Ratchet Porementioning

confidence: 99%

“…Following earlier studies [9,16,17], the particle-wall interactions are modeled via an elastic ballistic reflection condition. While the detailed particle-wall hydrodynamics are not captured by this boundary condition, we have shown [17] that this qualitatively captures the action of the pore wall in generating rectified particle motion. All particles were initially placed at the left opening of the pore, and the flow cycle was such that the initial fluid velocity was from left to right in Fig.…”

Section: Particle Drift In a Single Ratchet Porementioning

confidence: 99%

“…In this paper, we investigate whether the girdle band pores structure can act as an effective drift ratchet using the numerical model validated in Herringer et al [17]. To accomplish this, we revisit data published by Kettner et al [9], who detailed how the ratchet mechanism is dependent on microparticle size, and we compare this to the case of diatom girdle band pores.…”

Section: Introductionmentioning

confidence: 99%

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Can diatom girdle band pores act as a hydrodynamic viral defense mechanism?

et al. 2019

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Diatoms are microalgae encased in highly structured and regular frustules of porous silica. A long-standing biological question has been the function of these frustules, with hypotheses ranging from them acting as photonic light absorbers to being particle filters. While it has been observed that the girdle band pores of the frustule of Coscinodiscus sp. resemble those of a hydrodynamic drift ratchet, we show using scaling arguments and numerical simulations that they cannot act as effective drift ratchets. Instead, we present evidence that frustules are semiactive filters. We propose that frustule pores simultaneously repel viruses while promoting uptake of ionic nutrients via a recirculating, electroosmotic dead-end pore flow, a new mechanism of "hydrodynamic immunity".

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Section: Difference In Size Shape and Configuration Of The Poressupporting

confidence: 82%

Section: Particle Drift In a Single Ratchet Porementioning

confidence: 99%

Section: Particle Drift In a Single Ratchet Porementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Can diatom girdle band pores act as a hydrodynamic viral defense mechanism?

et al. 2019

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“…The study presented here may provide some elemental physical understanding to achieve the goal of protein, DNA or other macromolecular separation, separation of biological cells, as well as fine mineral particle separation [ 2 – 7 ] and their transport. There are many features of the current work which point to it complementing the recent analysis on hydrodynamic particle transport in tubes by Herringer et al [ 8 ]. Considering a more direct application, the model and simulation results can facilitate greater understanding of subcutaneous drug delivery.…”

Section: Introductionmentioning

confidence: 55%

Convective and diffusive effects on particle transport in asymmetric periodic capillaries

et al. 2017

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We present here results of a theoretical investigation of particle transport in longitudinally asymmetric but axially symmetric capillaries, allowing for the influence of both diffusion and convection. In this study we have focused attention primarily on characterizing the influence of tube geometry and applied hydraulic pressure on the magnitude, direction and rate of transport of particles in axi-symmetric, saw-tooth shaped tubes. Three initial value problems are considered. The first involves the evolution of a fixed number of particles initially confined to a central wave-section. The second involves the evolution of the same initial state but including an ongoing production of particles in the central wave-section. The third involves the evolution of particles a fully laden tube. Based on a physical model of convective-diffusive transport, assuming an underlying oscillatory fluid velocity field that is unaffected by the presence of the particles, we find that transport rates and even net transport directions depend critically on the design specifics, such as tube geometry, flow rate, initial particle configuration and whether or not particles are continuously introduced. The second transient scenario is qualitatively independent of the details of how particles are generated. In the third scenario there is no net transport. As the study is fundamental in nature, our findings could engender greater understanding of practical systems.

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Structural gradients and anisotropic hydraulic conductivity in the enigmatic eel traps of carnivorous corkscrew plants (Genlisea spp.)

Carmesin

Fleischmann

Klepsch

et al. 2021

American J of Botany

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Premise: Among the sophisticated trap types in carnivorous plants, the underground eel traps of corkskrew plants (Genlisea spp., Lentibulariaceae) are probably the least understood in terms of their functional principle. Here, we provide a detailed analysis of structural and hydraulic features of G. hispidula traps, contributing to the ongoing debate on whether these traps can actively generate water streams to promote prey capture. Methods: Anatomical and hydraulic traits of detached traps, including inner trap diameters, chamber line element, hair length, glandular pattern, and hydraulic conductivity, were investigated quantitatively using light and electron microscopy, x-ray microtomography, and hydraulic measurements. Results: Hydraulic resistivity in the neck of the trap, from the trap mouth toward the vesicle (digestive chamber) was 10 times lower than in the opposite direction. The comparison of measured and theoretical flow rates suggests that the retrorse hairs inside trap necks also provide considerable resistance against movement of matter toward the vesicle. Hairs showed a gradient in length along the neck, with the shortest hairs near the vesicle. Co-occurrence of quadrifid and bifid glands was limited to a small part of the neck, with quadrifids near the vesicle and bifids toward the trap mouth. Conclusions: The combination of structural gradients with hydraulic anisotropy suggests the trap is a highly fine-tuned system based on likely trade-offs between efficient prey movement in the trap interior toward the vesicle, prey retention, and spatial digestion capacities and is not counter to the generation of water streams.

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Hydrodynamic drift ratchet scalability

Cited by 4 publications

References 30 publications

Can diatom girdle band pores act as a hydrodynamic viral defense mechanism?

Can diatom girdle band pores act as a hydrodynamic viral defense mechanism?

Convective and diffusive effects on particle transport in asymmetric periodic capillaries

Structural gradients and anisotropic hydraulic conductivity in the enigmatic eel traps of carnivorous corkscrew plants (Genlisea spp.)

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