Searched for: author%3A%22Padding%2C+J.T.%22
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Butt, E.N. (author), Padding, J.T. (author), Hartkamp, Remco (author)
The local conditions inside a gas diffusion electrode (GDE) pore, especially in the electrical double layer (EDL) region, influence the charge transfer reactions and the selectivity of desired CO<sub>2</sub>ER products. Most GDE computational models ignore the EDL or are limited in their applicability at high potentials. In this work, we...
journal article 2024
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Van Rheenen, E.S. (author), Padding, J.T. (author), Visser, K. (author)
Hydrogen carriers are attractive alternative fuels for the shipping sectors. They are zero-emission, have high energy densities, and are safe, available, and easy to handle. Sodium borohydride, potassium borohydride, dibenzyltoluene, n-ethylcarbazole, and ammoniaborane are interesting hydrogen carriers, with high theoretical energy densities....
conference paper 2024
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Haverkort, J.W. (author), Sanderse, B. (author), Padding, J.T. (author), Blake, J.W. (author)
In flow-by capacitive deionization (CDI) brackish water flows between two electrodes that capacitively remove salt. We assume low inlet concentrations so “salt shocks” appear in the electrodes and the process becomes diffusion-limited. For unit charge efficiency, a simplified model is derived consisting of two coupled partial differential...
journal article 2024
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Ligthart, N.E.G. (author), Prats Vergel, G. (author), Padding, J.T. (author), Vermaas, D.A. (author)
CO2 conversion is an important part of the transition towards clean fuels and chemicals. However, low solubility of CO2 in water and its slow diffusion cause mass transfer limitations in aqueous electrochemical CO2 reduction. This significantly limits the partial current densities towards any desired CO2-reduction product. We propose using...
journal article 2024
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van Benten, M.C. (author), Padding, J.T. (author), Schott, D.L. (author)
Solid hydrogen carriers, such as sodium borohydride or potassium borohydride, are considered promising options to enable the use of hydrogen as a fuel for marine vessels, because of their favourable gravimetric and volumetric energy density compared to compressed or liquefied hydrogen. When using solid hydrogen carriers, in the form of granules...
conference paper 2023
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Nijssen, Tim M.J. (author), Padding, J.T. (author), Ottens, M. (author)
The hydrodynamics of the Expanded Bed Adsorption process is studied through simulations combining Computational Fluid Dynamics and the Discrete Element Method. A representative base case is defined, based on process design parameters commonly encountered in literature. Then, 19 other cases are defined, each representing a singular adjustment...
journal article 2023
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Habibi, P. (author), Postma, J.R.T. (author), Padding, J.T. (author), Dey, P. (author), Vlugt, T.J.H. (author), Moultos, O. (author)
Sodium borohydride (NaBH<sub>4</sub>) has a high hydrogen (H<sub>2</sub> ) gravimetric capacity of 10.7 wt %. NaBH<sub>4</sub> releases H<sub>2</sub> through a hydrolysis reaction in which aqueous NaB(OH)<sub>4</sub> is formed as a byproduct. NaB(OH)<sub>4</sub> strongly influences the thermophysical properties of aqueous solutions (i.e.,...
journal article 2023
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Nagalingam, Nagaraj (author), Raghunathan, Aswin (author), Korede, V.B. (author), Poelma, C. (author), Smith, C.S. (author), Hartkamp, Remco (author), Padding, J.T. (author), Eral, H.B. (author)
We demonstrate that a cavitation bubble initiated by a Nd:YAG laser pulse below breakdown threshold induces crystallization from supersaturated aqueous solutions with supersaturation and laser-energy-dependent nucleation kinetics. Combining high-speed video microscopy and simulations, we argue that a competition between the dissipation of...
journal article 2023
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Nijssen, Tim M.J. (author), Ottens, M. (author), Padding, J.T. (author)
Lubrication forces play a major role in the behaviour of fluid–solid systems, where they affect the collisions between particles. Current implementations of lubrication forces in unresolved simulations often suffer from shortcomings, such as neglecting parts of the physics or relying on arbitrarily defined parameters. In this short...
journal article 2023
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El Hasadi, Yousef M.F. (author), Padding, J.T. (author)
At the beginning of the second half of the twentieth century, Proudman and Pearson (J. Fluid. Mech.,2(3), 1956, pp.237–262) suggested that the functional form of the drag coefficient (C<sub>D</sub>) of a single sphere subjected to uniform fluid flow consists of a series of logarithmic and power terms of the Reynolds number (Re). In this paper...
journal article 2023
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Blake, J.W. (author), Konderla, V. (author), Baumgartner, L.M. (author), Vermaas, D.A. (author), Padding, J.T. (author), Haverkort, J.W. (author)
The use of gas diffusion electrodes that supply gaseous CO<sub>2</sub> directly to the catalyst layer has greatly improved the performance of electrochemical CO<sub>2</sub> conversion. However, reports of high current densities and Faradaic efficiencies primarily come from small lab scale electrolysers. Such electrolysers typically have a...
journal article 2023
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Butt, E.N. (author), Padding, J.T. (author), Hartkamp, Remco (author)
Electrochemical reduction of CO2 heavily depends on the reaction conditions found near the electrode surface. These local conditions are affected by phenomena such as electric double layer formation and steric effects of the solution species, which in turn impact the passage of CO2 molecules to the catalytic surface. Most models for CO2...
journal article 2023
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Van Rheenen, E.S. (author), Padding, J.T. (author), Slootweg, J. C. (author), Visser, K. (author)
Green hydrogen combined with PEM fuel cell systems is a viable option to meet the demand for alternative maritime fuels. However, hydrogen storage faces challenges, including low volumetric density, fire and explosion risks and transport challenges. We assessed over fifteen hydrogen carriers based on their maritime performance characteristics...
journal article 2023
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Korede, V.B. (author), Nagalingam, Nagaraj (author), Penha, Frederico Marques (author), van der Linden, Noah (author), Padding, J.T. (author), Hartkamp, Remco (author), Eral, H.B. (author)
Crystallization abounds in nature and industrial practice. A plethora of indispensable products ranging from agrochemicals and pharmaceuticals to battery materials are produced in crystalline form in industrial practice. Yet, our control over the crystallization process across scales, from molecular to macroscopic, is far from complete. This...
review 2023
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Nagalingam, Nagaraj (author), Raghunathan, Aswin (author), Korede, V.B. (author), Overmars, E.F.J. (author), Hung, S. (author), Hartkamp, Remco (author), Padding, J.T. (author), Smith, C.S. (author), Eral, H.B. (author)
Optofluidic devices have revolutionized the manipulation and transportation of fluid at smaller length scales ranging from micrometers to millimeters. We describe a dedicated optical setup for studying laser-induced cavitation inside a microchannel. In a typical experiment, we use a tightly focused laser beam to locally evaporate the solution...
journal article 2023
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Van Rheenen, E.S. (author), Padding, J.T. (author), Slootweg, J.C. (author), Visser, K. (author)
Increasing pressure on the reduction or elimination of the use of fossil fuels in shipping requires the application of new maritime fuel alternatives. Green and circular produced hydrogen as a maritime fuel in fuel cell systems offers a great solution for these concerns. A fuel cell system has a zero emission performance, solid state silent...
conference paper 2022
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Fan, R. (author), Habibi, P. (author), Padding, J.T. (author), Hartkamp, Remco (author)
In heterogeneous catalysis, reactivity and selectivity are not only influenced by chemical processes occurring on catalytic surfaces but also by physical transport phenomena in the bulk fluid and fluid near the reactive surfaces. Because these processes take place at a large range of time and length scales, it is a challenge to model...
journal article 2022
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Sanjeevi, Sathish K.P. (author), Dietiker, Jean F. (author), Padding, J.T. (author)
Detailed simulations of flow around various prolate spheroids are performed using multi-relaxation time lattice Boltzmann method (LBM). The simulations are performed in the Reynolds numbers range 0.1≤Re≤2000 at different incident angles 0<sup>∘</sup>≤ϕ≤90<sup>∘</sup> for various prolate spheroids of aspect ratios 1≤λ≤8. The Re is based on the...
journal article 2022
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Tsekos, C. (author), de Voogt, D. (author), de Jong, W. (author), Padding, J.T. (author)
This work focuses on the numerical modelling and experimental validation of the hydrodynamic behaviour of a novel 50 kW<sub>th</sub> indirectly heated bubbling fluidized bed steam reformer. The hydrodynamic behaviour of fluidized beds with immersed vertical tubes and complex fluidized bed geometries in general have not been thoroughly...
journal article 2022
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Mohammadzadeh Moghaddam, E. (author), Foumeny, Esmail A. (author), Stankiewicz, A.I. (author), Padding, J.T. (author)
We investigate forced convective heat transfer in packings of spheres, cylinders and Raschig rings, made of glass, steel and alumina, in relatively narrow tubes. A detailed comparison is made between resolved pellet-scale, azimuthally-averaged temperature profiles, and 2D-axially-dispersed pseudo-homogenous plug flow (2D-ADPF) predictions....
journal article 2021
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