Journal: Chemical Engineering Journal

Abbreviation

Chem. Eng. J.

Publisher

Elsevier

Journal Volumes

ISSN

0300-9467
1385-8947
1873-3212
0923-0467

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Publications1 - 10 of 112
  • Steady thermal regimes of a parallel-plane packed bed reactor with an organized structure
    Item type: Journal Article
    Magyari, Eugen (2009)
    Chemical Engineering Journal
  • Kinetic analysis of the carbonation reactions for the capture of CO2 from air via the Ca(OH)2-CaCO3-CaO solar thermochemical cycle
    Item type: Journal Article
    Nikulshina, V.; Galvez, M. E.; Steinfeld, Aldo (2007)
    Chemical Engineering Journal
  • Scale attachment and detachment: The role of hydrodynamics and surface morphology
    Item type: Journal Article
    Løge, Isaac A.; Bentzon, Jakob R.; Klingaa, Christopher G.; et al. (2022)
    Chemical Engineering Journal
    Crystallization fouling presents a significant challenge in a wide range of industries. Accurate understanding of crystal formation is crucial for planning preventative measures and maximizing the effectiveness of maintenance interventions. In this study, we demonstrate that understanding net deposition rates depends on the knowledge of the detachment mechanisms and deposition distribution characteristics. We quantify deposition in a once-through flow set-up and visualize crystal formation through high-resolution X-ray micro-computed tomography scanning. Additionally, we quantify the height distribution of deposited crystals through computed surface texture parameters. Finally, we use computational fluid dynamics, implementing large-eddy simulations turbulence modelling and Eulerian transport of chemical species, to describe bulk and wall reactions and quantify energy and mass transport in turbulent eddies. Results show that attachment and detachment processes depend on fluid hydrodynamics; the influx of material determines the overall deposition to the surface, while the deposition pattern is governed by the surface morphology of the initial surface morphology. Our findings provide a foundation for understanding fouling mechanisms and present a template for developing more accurate prediction models.
  • Washcoating of catalytic particulate filters studied by time-resolved X–ray tomography
    Item type: Journal Article
    Blažek, Miroslav; Žalud, Milan; Kočí, Petr; et al. (2021)
    Chemical Engineering Journal
    In this paper we introduce a new application of time-resolved X-ray tomography (XRT) to imaging of the washcoating process in catalytic monolith filters with a honeycomb structure (DPF, GPF). The method is applied to several alumina washcoats with different particle size distributions deposited on a cordierite substrate. The results bring new insights into the drying dynamics of the porous filter wall as well as the on-wall catalyst layer, including the process of layer shrinking and cracking. The XRT results are supplemented by cross-section scanning electron microscopy images and mercury intrusion porosimetry of the final structures. In addition to the statistical analysis of the washcoat distribution, the impact of the washcoat structure on filter pressure loss is determined by experiments.
  • Mapping the 3D water dynamics in heterogeneous sands using thermal neutrons
    Item type: Conference Paper
    Kaestner, A.; Hassanein, R.; Vontobel, P.; et al. (2007)
    Chemical Engineering Journal
  • An experimental study of liquid mixing in a multi-orifice-impinging transverse jet mixer using PLIF
    Item type: Journal Article
    Luo, Peicheng; Jia, Haiyan; Xin, Chuanxian; et al. (2013)
    Chemical Engineering Journal
  • Population balance modelling of magnesium hydroxide precipitation: Full validation on different reactor configurations
    Item type: Journal Article
    Raponi, Antonello; Achermann, Ramona; Romano, Salvatore; et al. (2023)
    Chemical Engineering Journal
    In this paper, a predictive mono-dimensional (1D) model for Mg(OH)2 precipitation is proposed and its predictive capability is tested. Two different reactor configurations are analyzed and compared, namely a T-mixer and a Y-mixer followed by two consecutive diverging channels and a final coil of constant diameter. Both setups were chosen for their high mixing efficiency. The suspension samples were characterized by Dynamic Light Scattering (DLS), thus obtaining particle size distributions (PSD). The experimental data collected using the T-mixer was used to identify the kinetics parameters set, while the data obtained through the Y-mixer setup was employed to assess the model predictive capability under different fluid dynamics conditions. Computational Fluid Dynamics (CFD) simulations were conducted to characterize the flow fields and the turbulence, which were integrated into the 1D model. Predictions were found to be in good agreement with the experimental data and further improved after introducing a novel correction factor for the aggregation kernel.
  • Model based control of a liquid swelling constrained batch reactor subject to recipe uncertainties
    Item type: Journal Article
    Simon, Levente L.; Nagy, Zoltan K.; Hungerbühler, Konrad (2009)
    Chemical Engineering Journal
  • Inhibition of condensation-induced droplet wetting by nano-hierarchical surfaces
    Item type: Journal Article
    Song, Jiayu; Hou, Youmin; Sudersan, Pranav; et al. (2023)
    Chemical Engineering Journal
    Superhydrophobic nanostructured surfaces can enhance water condensation efficiency by facilitating droplet departure via coalescence-induced jumping. However, condensed droplets tend to transit from a mobile jumping mode to a highly pinned state at high condensation heat flux because excessive water nucleates within the nanostructures and anchors the condensed droplets. The large pinned droplets act as a thermal barrier and insulate the cooling surface, thus severely degrading its heat transfer efficiency. This work developed a nanohierarchical structured surface by growing branched TiO₂ nanorod arrays to prevent condensation-induced droplet pinning. After hydrophobization, the nano-hierarchical structure can spontaneously push the water out of nanostructures with an outward Laplace capillary pressure gradient when the droplet size is only at the nanoscale level. This effective de-wetting process maintains the high droplet mobility on the nano-hierarchical surface over a wide subcooling range, resulting in an up to ~ 90 % increase in heat transfer coefficient at a high heat flux of 132 kW•m⁻² compared to the single-tier nanorod surface. Our investigation of how the nanohierarchical structures fundamentally suppress the condensation-induced wetting on superhydrophobic surfaces represents a significant advance in understanding multiphase wetting phenomena and paves the way for the rational design of cooling surfaces.
  • Achieving BT.2020 red emission with narrowband deep-red iridium complexes in OLEDs
    Item type: Journal Article
    Lee, Gyeong Seok; Jeong, Woo Jin; Zhou, Huanyu; et al. (2026)
    Chemical Engineering Journal
    Achieving deep-red emission that meets the stringent BT.2020 color standard remains a critical challenge for phosphorescent organic light-emitting diodes (OLEDs). Here, we report two newly designed Iridium (Ir) (III) complexes, Ir(6-PhIqXy)2dend and Ir(7-PhIqXy)2dend, which incorporate a 1-(3,5-dimethylphenyl)-phenylisoquinoline ligand to enhance electron density, extend π-conjugation, and promote a planar molecular geometry favorable for horizontal dipole orientation. The newly designed Ir(III)-based emitters exhibit high photoluminescent quantum yields of 79.1% and 80.1%, deep-red emission peaks at 635 and 637 nm, and narrow full widths at half maximum (FWHMs) of 47 and 50 nm, respectively. Furthermore, the introduction of the ligand results in a high horizontal dipole ratio of 90.7% for Ir(6-PhIqXy)2dend, leading to efficient light outcoupling and a maximum external quantum efficiency (EQE) of 19.1% without spectral broadening. Importantly, OLEDs incorporating both emitters exhibit ultra-narrowband deep-red emission peaking at 641 nm with a FWHM of 49 nm, yielding Commission Internationale de l'Éclairage (CIE) coordinates of (0.705, 0.294), which is the closest match to the BT.2020 red standard (0.708, 0.292) reported to date among Ir(III) - or Platinum(II)-based OLEDs. This work demonstrates that rational ligand engineering in Ir(III)-based phosphorescent emitters can concurrently achieve BT.2020-level color purity and high efficiency, providing a promising strategy for next-generation ultra-high-definition OLED displays.
Publications1 - 10 of 112