Jens Honoré Walther


Last Name

Walther

First Name

Jens Honoré

ORCID

0000-0001-8100-9178

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Publications 1 - 10 of 169
  • A multiresolution remeshed Vortex-In-Cell algorithm using patches
    Item type: Journal Article
    Rasmussen, Johannes Tophøj; Cottet, Georges-Henri; Walther, Jens Honoré (2011)
    Journal of Computational Physics
  • Water thermophoresis in carbon nanotubes: the interplay between thermophoretic and friction forces
    Item type: Journal Article
    Oyarzua, Elton; Walther, Jens Honoré; Zambrano, Harvey A. (2018)
    Physical Chemistry Chemical Physics
  • Water-carbon interactions III
    Item type: Journal Article
    Walther, Jens Honoré; Werder, T.; Jaffe, R.L.; et al. (2004)
    Physical Chemistry Chemical Physics
  • Continuum simulations of water flow in carbon nanotube membranes
    Item type: Journal Article
    Popadic, A.; Walther, Jens Honoré; Koumoutsakos, P.; et al. (2014)
    New Journal of Physics
    We propose the use of the Navier–Stokes equations subject to partial-slip boundary conditions to simulate water flows in Carbon NanoTube (CNT) membranes. The finite volume discretizations of the Navier–Stokes equations are combined with slip lengths extracted from molecular dynamics (MD) simulations to predict the pressure losses at the CNT entrance as well as the enhancement of the flow rate in the CNT. The flow quantities calculated from the present hybrid approach are in excellent agreement with pure MD results while they are obtained at a fraction of the computational cost. The method enables simulations of system sizes and times well beyond the present capabilities of MD simulations. Our simulations provide an asymptotic flow rate enhancement and indicate that the pressure losses at the CNT ends can be reduced by reducing their curvature. More importantly, our results suggest that flows at nanoscale channels can be described by continuum solvers with proper boundary conditions that reflect the molecular interactions of the liquid with the walls of the nanochannel.
  • PPM
    Item type: Journal Article
    Sbalzarini, I.F.; Walther, Jens Honoré; Bergdorf, M.; et al. (2006)
    Journal of Computational Physics
  • Hydrodynamics of the leucon sponge pump
    Item type: Journal Article
    Asadzadeh, Seyed S.; Larsen, Poul S.; Riisgard, Hans U.; et al. (2019)
    Journal of the Royal Society. Interface
  • Large eddy simulation of soot formation and oxidation for different ambient temperatures and oxygen levels
    Item type: Journal Article
    Zhang, Min; Ong, Jiun Cai; Pang, Kar Mun; et al. (2022)
    Applied Energy
    This paper presents the numerical study of soot formation and oxidation processes across different ambient temperatures (900K, 1000K, and 1100K) and oxygen levels (15% and 21% O2) using large eddy simulation coupled with a two-equation soot model. The predicted ignition delay time, lift-off length and soot distribution show good agreements with the corresponding experimental data. A stronger oxidation of the precursor (C2H2) in the 21% O2 cases results in a lower C2H2 formed, as compared to the 15% O2 cases. The increasing ambient temperature leads to the fuel-richer region (roughly equivalence ratio > 1.6) becoming more favorable for C2H2 formation and, consequently, soot formation. This is more apparent in the 15% O2 cases due to a weaker oxidation of C2H2 via O and OH radicals. As a result, the difference in the soot mass between the 15% and 21% O2 cases becomes larger as the ambient temperature increases. The effects of ambient temperature and O2 level on soot sub-processes are investigated. In addition to the flame temperature, OH mass and soot surface area are the dominant parameters in the oxidation processes via OH and O2 at varying O2 levels, respectively.
  • Simulating the DISAMATIC process using the discrete element method — a dynamical study of granular flow
    Item type: Journal Article
    Hovad, Emil; Spangenberg, Jon; Larsen, Per; et al. (2016)
    Powder Technology
  • Modeling the Interaction Between Ethylene Diamine and Water Films on the Surface of a Carbon Nanotube
    Item type: Other Conference Item
    Jaffe, R.; Walther, Jens Honoré; Zimmerli, U.; et al. (2004)
    Meeting abstracts / the Electrochemical Society ~ 2004 Joint International Meeting : October 3-8, 2004, Honolulu, Hawaii
  • Effect of the meniscus contact angle during early regimes of spontaneous imbibition in nanochannels
    Item type: Journal Article
    Karna, Nabin K.; Oyarzua, Elton; Walther, Jens Honoré; et al. (2016)
    Physical Chemistry Chemical Physics
Publications 1 - 10 of 169