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  1. Book ; Online: Thermal Flows

    Lappa, Marcello

    2022  

    Keywords Research & information: general ; Physics ; coating flow ; free surface ; boundary layer ; stress singularity ; matched asymptotic expansions ; computational fluid dynamics ; turbulence ; rotating thermal convection ; Rayleigh-Bénard ; heat enhancement ; nanofluid ; circular pipe ; twisted tape ; porous media ; metal foam ; convection-driven dynamos ; numerical simulations ; bistability ; mean-field magnetohydrodynamics ; spherical shells ; stochastic equations ; equivalence of measures ; nature of turbulence ; critical Reynolds number ; thermovibrational convection ; gravity modulation ; thermofluid-dynamic distortions ; patterning behavior ; stratified mixing layer ; non-modal instability ; Kelvin-Helmholtz instability ; Holmboe instability ; rotating thermal magnetoconvection ; linear onset ; sphere ; Rayleigh-Bénard convection ; time periodical cooling ; Lattice Boltzmann method ; thermocapillary-driven convection ; half-zone liquid bridges ; particles ; coherent structures ; particle accumulation structure (PAS) ; high Prandtl number fluids ; plane layer ; circular translational vibrations ; thermal vibrational convection ; convective patterns ; n/a
    Language 0|e
    Size 1 electronic resource (232 pages)
    Publisher MDPI - Multidisciplinary Digital Publishing Institute
    Publishing place Basel
    Document type Book ; Online
    Note English ; Open Access
    HBZ-ID HT021608802
    ISBN 9783036522272 ; 3036522271
    Database ZB MED Catalogue: Medicine, Health, Nutrition, Environment, Agriculture

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  2. Article ; Online: Competing particle attractee in liquid bridges.

    Parker, Robert / Capobianchi, Paolo / Lappa, Marcello

    Philosophical transactions. Series A, Mathematical, physical, and engineering sciences

    2023  Volume 381, Issue 2245, Page(s) 20220302

    Abstract: Assuming the so-called particle accumulation structures (PAS) in liquid bridges as archetypal systems for the investigation of particle self-assembly phenomena in laminar time-periodic flows, an attempt is made here to disentangle the complex hierarchy ... ...

    Abstract Assuming the so-called particle accumulation structures (PAS) in liquid bridges as archetypal systems for the investigation of particle self-assembly phenomena in laminar time-periodic flows, an attempt is made here to disentangle the complex hierarchy of relationships existing between the multiplicity of the loci of aggregation (streamtubes which coexist in the physical space as competing attractee) and the particle structures effectively showing up. While the former depends on purely topological (fluid-dynamic) arguments, the influential factors driving the outcomes of the fluid-particle interaction seem to obey a much more complex logic, which makes the arrangement of particles different from realization to realization. Through numerical solution of the governing Eulerian and Lagrangian equations for liquid and mass transport, we show that for a fixed aspect ratio of the liquid bridge, particles can be gradually transferred from one streamtube to another as the Stokes number and/or the Marangoni number are varied. Moreover, ranges exist where these attractors compete resulting in overlapping or intertwined particle structures, some of which, characterized by a strong degree of asymmetry, have never been reported before. This article is part of the theme issue 'New trends in pattern formation and nonlinear dynamics of extended systems'.
    Language English
    Publishing date 2023-02-27
    Publishing country England
    Document type Journal Article
    ZDB-ID 208381-4
    ISSN 1471-2962 ; 0080-4614 ; 0264-3820 ; 0264-3952 ; 1364-503X
    ISSN (online) 1471-2962
    ISSN 0080-4614 ; 0264-3820 ; 0264-3952 ; 1364-503X
    DOI 10.1098/rsta.2022.0302
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

    Z 4' 46/25: Show issues
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  3. Article ; Online: Competition of overstability and stabilizing effects in viscoelastic thermovibrational flow.

    Boaro, Alessio / Lappa, Marcello

    Physical review. E

    2021  Volume 104, Issue 2-2, Page(s) 25102

    Abstract: Attention is paid to a specific form of thermal convection which encompasses viscoelastic and thermovibrational effects in a single problem or framework. The main objective is understanding the relationship between the phenomenon of overstability and ... ...

    Abstract Attention is paid to a specific form of thermal convection which encompasses viscoelastic and thermovibrational effects in a single problem or framework. The main objective is understanding the relationship between the phenomenon of overstability and periodic forcing through numerical solution of the governing equations in their complete, time-dependent, and nonlinear form. Fluid motion is found for values of the control parameter one order of magnitude smaller than the threshold to be exceeded in the equivalent Newtonian case. When the disturbances saturate their amplitude, patterns emerge that are reminiscent of the superlattice structures typical of complex order. In the present case, such peculiar modes of convection are driven by the coexistence of two distinct spatial scales, each displaying a different temporal dependence, driven by the interplay of the time-varying (stabilizing or destabilizing) acceleration induced by vibrations and the ability of the fluid to store and release elastic energy.
    Language English
    Publishing date 2021-09-16
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2844562-4
    ISSN 2470-0053 ; 2470-0045
    ISSN (online) 2470-0053
    ISSN 2470-0045
    DOI 10.1103/PhysRevE.104.025102
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Patterning behavior of gravitationally modulated supercritical Marangoni flow in liquid layers.

    Lappa, Marcello

    Physical review. E

    2016  Volume 93, Issue 5, Page(s) 53107

    Abstract: The objective of the present analysis is the investigation of hybrid convection induced by the joint influence of imposed vibrations (g-jitters) of desired amplitude and frequency and surface-tension-induced forces in a nonisothermal liquid layer. This ... ...

    Abstract The objective of the present analysis is the investigation of hybrid convection induced by the joint influence of imposed vibrations (g-jitters) of desired amplitude and frequency and surface-tension-induced forces in a nonisothermal liquid layer. This study may be regarded as the natural extension of an earlier work [V. M. Shevtsova, I. Nepomnyashchy, and J. C. Legros, Phys. Rev. E 67, 066308 (2003)10.1103/PhysRevE.67.066308], where the focus was on convection driven by interacting thermocapillarity and steady gravity. As in that work, conditions are considered for which the unperturbed (vibrationless) Marangoni flow would be characterized by the emergence and propagation of a classical hydrothermal wave, namely, a supercritical thermofluidynamic disturbance propagating continuously in the upstream direction. A number of numerical results are analyzed and discussed. Regimes of quasistationary rolls, standing waves, traveling waves, and modulated (pulsotraveling) disturbances are identified in the considered space of parameters. Most interestingly, it is observed that traveling waves can reverse their direction of propagation in some specific regions of the phase space.
    Language English
    Publishing date 2016-05
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2844562-4
    ISSN 2470-0053 ; 2470-0045
    ISSN (online) 2470-0053
    ISSN 2470-0045
    DOI 10.1103/PhysRevE.93.053107
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Two-dimensional vibrationally driven solid particle structures in non-uniformly heated fluid containers.

    Crewdson, Georgie / Evans, Matthew / Lappa, Marcello

    Chaos (Woodbury, N.Y.)

    2022  Volume 32, Issue 10, Page(s) 103119

    Abstract: Building on a pre-existing line of inquiry where the presence of solid particle attractors in thermovibrationally driven flows was demonstrated in cavities subjected to a unidirectional temperature gradient, the present work considers cases where the ... ...

    Abstract Building on a pre-existing line of inquiry where the presence of solid particle attractors in thermovibrationally driven flows was demonstrated in cavities subjected to a unidirectional temperature gradient, the present work considers cases where the direction of such a gradient is allowed to change inside the fluid. Moreover, the considered configurations differ with regard to the angle that vibrations form with respect to a reference axis. Variations in the orientation of the temperature gradient are made possible by setting a non-uniform temperature distribution along certain walls. The relationship between the multiplicity (N) of the loci of particle attraction and the inhomogeneities in the temperature field is studied. It is shown that N can exceed the limit N = 2 found in earlier studies and that a zoo of new particle accumulation structures show up, whose ranges of existence depend on the amplitude and frequency of vibrational acceleration, the particle Stokes number, the orientation of vibrations, and the number of inversions in the direction of the temperature gradient.
    Language English
    Publishing date 2022-08-10
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1472677-4
    ISSN 1089-7682 ; 1054-1500
    ISSN (online) 1089-7682
    ISSN 1054-1500
    DOI 10.1063/5.0104680
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: On the existence and multiplicity of one-dimensional solid particle attractors in time-dependent Rayleigh-Bénard convection.

    Lappa, Marcello

    Chaos (Woodbury, N.Y.)

    2013  Volume 23, Issue 1, Page(s) 13105

    Abstract: For the first time evidence is provided that one-dimensional objects formed by the accumulation of tracer particles can emerge in flows of thermogravitational nature (in the region of the space of parameters, in which the so-called OS (oscillatory ... ...

    Abstract For the first time evidence is provided that one-dimensional objects formed by the accumulation of tracer particles can emerge in flows of thermogravitational nature (in the region of the space of parameters, in which the so-called OS (oscillatory solution) flow of the Busse balloon represents the dominant secondary mode of convection). Such structures appear as seemingly rigid filaments, rotating without changing their shape. The most interesting (heretofore unseen) feature of such a class of physical attractors is their variety. Indeed, distinct shapes are found for a fixed value of the Rayleigh number depending on parameters accounting for particle inertia and viscous drag. The fascinating "sea" of existing potential paths, their multiplicity and tortuosity are explained according to the granularity of the loci in the physical space where conditions for phase locking between the traveling thermofluid-dynamic disturbance and the "turnover time" of particles in the basic toroidal flow are satisfied. It is shown, in particular, how the observed wealth of geometric objects and related topological features can be linked to a general overarching attractor representing an intrinsic (particle-independent) property of the base velocity field.
    MeSH term(s) Computer Simulation ; Convection ; Motion ; Nonlinear Dynamics ; Numerical Analysis, Computer-Assisted ; Oscillometry ; Reproducibility of Results ; Rheology ; Temperature ; Time Factors ; Viscosity
    Language English
    Publishing date 2013-03
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1472677-4
    ISSN 1089-7682 ; 1054-1500
    ISSN (online) 1089-7682
    ISSN 1054-1500
    DOI 10.1063/1.4773001
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Gravitational thermal flows of liquid metals in 3D variable cross-section containers: Transition from low-dimensional to high-dimensional chaos.

    Lappa, Marcello / Ferialdi, Hermes

    Chaos (Woodbury, N.Y.)

    2018  Volume 28, Issue 9, Page(s) 93114

    Abstract: This study extends the numerical results presented in author's past work [M. Lappa and H. Ferialdi, Phys. ... ...

    Abstract This study extends the numerical results presented in author's past work [M. Lappa and H. Ferialdi, Phys. Fluids
    Language English
    Publishing date 2018-09-26
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1472677-4
    ISSN 1089-7682 ; 1054-1500
    ISSN (online) 1089-7682
    ISSN 1054-1500
    DOI 10.1063/1.5040580
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Book: Rotating thermal flows in natural and industrial processes

    Lappa, Marcello

    2012  

    Abstract: In this context, it is expressly shown how the aforementioned isomorphism between small and large scale phenomena becomes beneficial to the definition and ensuing development of an integrated comprehensive framework allowing the reader to understand and ...

    Title variant Rotating thermal flows
    Author's details Marcello Lappa
    Abstract "In this context, it is expressly shown how the aforementioned isomorphism between small and large scale phenomena becomes beneficial to the definition and ensuing development of an integrated comprehensive framework allowing the reader to understand and assimilate the underlying quintessential mechanisms without requiring, however, familiarity with specific literature on the subject"--
    Keywords Heat/Transmission ; Rotating masses of fluid
    Language English
    Size XVIII, 522 S., Ill., graph. Darst.
    Edition 1. ed.
    Publisher Wiley
    Publishing place Chichester
    Document type Book
    Note Literaturverz. S. [473] - 509, Index
    ISBN 9781119960799 ; 1119960797
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  9. Article ; Online: Symmetry properties and bifurcations of viscoelastic thermovibrational convection in a square cavity.

    Boaro, Alessio / MacDowall, Gregor / Lappa, Marcello

    Physical review. E

    2018  Volume 108, Issue 6-2, Page(s) 65101

    Abstract: To fill a gap in the literature about the specific dynamics of thermovibrational flow in a square cavity filled with a viscoelastic fluid when vibrations and the imposed temperature gradient are concurrent, a parametric investigation has been conducted ... ...

    Abstract To fill a gap in the literature about the specific dynamics of thermovibrational flow in a square cavity filled with a viscoelastic fluid when vibrations and the imposed temperature gradient are concurrent, a parametric investigation has been conducted to investigate the response of this system over a relatively wide subregion of the space of parameters (Pr_{g}=10; viscosity ratio ξ=0.5; nondimensional frequency Ω=25, 50, 75, and 100; and Ra_{ω}∈[Ra_{ω,cr},3.3×10^{4}], where Ra_{ω,cr} is the critical vibrational Rayleigh number). Through solution of the governing nonlinear equations formulated in the framework of the finitely extensible nonlinear elastic Chilcott-Rallison paradigm, it is shown that the flow is prone to develop a unique hierarchy of bifurcations where initially subharmonic spatiotemporal regimes can be taken over by more complex states driven by the competition of disturbances with different symmetries if certain conditions are considered. What drives a wedge between the cases with parallel and perpendicular vibrations is essentially the existence of a threshold to be exceeded to produce convection in the former case. Nevertheless, these two configurations share some interesting properties, which are reminiscent of the resonances and antiresonances typical of multicomponent mechanical structures. Additional insights into these behaviors are gained through consideration of quantities representative of the kinetic and elastic energy globally possessed by the system and its sensitivity to the initial conditions.
    Language English
    Publishing date 2018-04-12
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2844562-4
    ISSN 2470-0053 ; 2470-0045
    ISSN (online) 2470-0053
    ISSN 2470-0045
    DOI 10.1103/PhysRevE.108.065101
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article: Discrete layers of interacting growing protein seeds: convective and morphological stages of evolution.

    Lappa, Marcello

    Physical review. E, Statistical, nonlinear, and soft matter physics

    2005  Volume 71, Issue 3 Pt 1, Page(s) 31904

    Abstract: The growth of several macromolecular seeds uniformly distributed on the bottom of a protein reactor (i.e., a discrete layer of N crystals embedded within a horizontal layer of liquid with no-slip boundaries) under microgravity conditions is investigated ... ...

    Abstract The growth of several macromolecular seeds uniformly distributed on the bottom of a protein reactor (i.e., a discrete layer of N crystals embedded within a horizontal layer of liquid with no-slip boundaries) under microgravity conditions is investigated for different values of N and for two values of the geometrical aspect ratio of the container. The fluid dynamics of the growth reactor and the morphological (shape-change) evolution of the crystals are analyzed by means of a recently developed moving boundary method based on differential equations coming from the protein "surface incorporation kinetics." The face growth rates are found to depend on the complex multicellular structure of the convective field and on associated "pluming phenomena." This correspondence is indirect evidence of the fact that mass transport in the bulk and surface attachment kinetics are competitive as rate-limiting steps for growth. Significant adjustments in the roll pattern take place as time passes. The convective field undergoes an interesting sequence of transitions to different values of the mode and to different numbers of rising solutal jets. The structure of the velocity field and the solutal effects, in turn, exhibit sensitivity to the number of interacting crystals if this number is small. In the opposite case, a certain degree of periodicity can be highlighted for a core zone not affected by edge effects. The results with no-slip lateral walls are compared with those for periodic boundary conditions to assess the role played by geometrical constraints in determining edge effects and the wavelength selection process. The numerical method provides "microscopic" and "morphological" details as well as general rules and trends about the macroscopic evolution (i.e., "ensemble behaviors") of the system.
    MeSH term(s) Binding Sites ; Computer Simulation ; Crystallization/methods ; Evolution, Molecular ; Models, Chemical ; Models, Molecular ; Multiprotein Complexes/chemistry ; Multiprotein Complexes/ultrastructure ; Protein Binding ; Protein Conformation ; Proteins/chemistry ; Proteins/ultrastructure
    Chemical Substances Multiprotein Complexes ; Proteins
    Language English
    Publishing date 2005-03
    Publishing country United States
    Document type Evaluation Studies ; Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1539-3755
    ISSN 1539-3755
    DOI 10.1103/PhysRevE.71.031904
    Database MEDical Literature Analysis and Retrieval System OnLINE

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