Article
Mathematics, Applied
Aidi Yao, Wancheng Sheng
Summary: This paper investigates the expansion problem of a two-dimensional isentropic pseudo-steady supersonic flow expanding into vacuum around a sharp corner. By using characteristic decompositions and invariant regions, the interaction of two symmetric non-planar simple waves in the 2D self-similar Euler equations was analyzed to obtain the global existence of the solution for the interaction of a simple wave with a rigid wall boundary. This leads to the global existence of the solution up to the interface of supersonic flow with vacuum in the expansion problem.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2022)
Article
Mechanics
Kuangshi Chen, Jinglei Xu, Qihao Qin, Shuai Huang
Summary: Supersonic axisymmetric expansion flow is an important issue in gas dynamics, especially for the design and evaluation of supersonic/hypersonic vehicles and their propulsion systems. This study focuses on developing an analytical solution for the supersonic axisymmetric flow around a sharp convex corner, which is currently only available through computational fluid dynamics.
Article
Engineering, Aerospace
Yongchan Kim, Junyeop Nam, Tae-Seong Roh, Hyoung Jin Lee
Summary: This study analyzed the base drag and flow characteristics of cold and hot gas flow in a supersonic flow through numerical simulations. The results showed that the change in base drag ranged from 5% to 85% depending on the injection gases. The base drag in hot gas flow exhibited different variations under different conditions, and the flow structures also differed from those in cold flow.
Article
Mechanics
Julian Restrepo, Jose R. Simoes-Moreira
Summary: This study investigates the viscous effects on an ideal gas flow in a supersonic convergent-divergent nozzle using a realistic equation of state. The study discusses the influence of the Gruneisen parameter, viscous and real gas effects on the formation of the sonic point, and calculates the maximum values of the discharge coefficient and the isentropic nozzle efficiency. Furthermore, the study evaluates the formation and intensity of normal shock waves using the Rankine-Hugoniot relations, which now depend on real gas and viscous effects.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mathematics
Geng Lai
Summary: This paper studies two types of three-dimensional stationary supersonic flows in relativistic hydrodynamics: supersonic flows expanding in vacuum and supersonic flows against an infinite curved cone. The study focuses on the global existence of solutions for these two types of flows under certain conditions. The results show the existence of a piecewise smooth solution expanding in vacuum and the global existence of attached conical shock waves when a supersonic flow hits a curved cone.
JOURNAL OF THE LONDON MATHEMATICAL SOCIETY-SECOND SERIES
(2023)
Article
Mechanics
V. I. Lysenko, S. A. Gaponov, B. V. Smorodsky, A. N. Semenov, S. O. Morozov, A. V. Starov
Summary: This theoretical study investigates the influence of distributed injection and combustion of hydrogen on the stability and transition of a supersonic boundary layer. Using computational fluid dynamics and linear stability theory, the researchers analyzed the effects of hydrogen diffusion flame on the position of the laminar-turbulent transition.
Article
Engineering, Aerospace
Daniel Bogdanyuk, Vladislav Emelyanov, Alexander Pustovalov, Konstantin Volkov
Summary: This study presents the results of numerical simulation of particle-laden supersonic flows expanding from a converging-diverging nozzle into a rarefied atmosphere. A marching scheme and finite volume method were used to calculate flow quantities for a wide range of nozzle pressure ratios and investigate the flow behavior at the nozzle outlet. The trajectories of solid particles during flow expansion were provided, and the effects of particle size and injection point coordinates on particle transport in supersonic flows were discussed. Comparisons were made between calculations using the Stokes approximation for the drag coefficient and calculations considering particle inertia and gas flow rarefaction. The results have implications for studying supersonic particle-laden flows around bodies and calculating oblique shock waves.
Article
Thermodynamics
A. P. Kryukov, V. V. Zhakhovsky, V. Yu Levashov
Summary: This study investigates intense heat-mass transfer in a gas flow to a condensation surface using consistent atomistic and kinetic theory methods. The Boltzmann kinetic equation is solved with the moment method, demonstrating close flow profiles to molecular dynamics simulations. The study also identifies conditions for complete, partial, and ceased condensation regimes.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Physical
Yi Xue, Jia Liu, Xin Liang, Xue Li, Songhe Wang, Zongyuan Ma, Shaowei Zhang, Xuanye Jiao
Summary: As the simplest saturated hydrocarbon, methane plays a crucial role in hydrogen and carbon energy. Maintaining the stability and sealing of caprock is essential for safe underground storage of energy. A fully coupled two-phase flow model is established to study the migration mechanism of methane in caprock, considering the characteristics of the dual porosity medium. The model incorporates methane and brine seepage in the fracture network and the dynamic adsorption-desorption process in the matrix.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Mechanics
Rui Yang, Davide Modesti, Yu-xin Zhao, Qian-cheng Wang, Zhen-guo Wang, Sergio Pirozzoli
Summary: In this study, the Reynolds-averaged Navier-Stokes equations with a Reynolds stress model were used to investigate the impact of corner angles in supersonic flows. The parametric study revealed that the maximum strength of secondary flows occurred at 90 degrees, with their shape maintained by translating parallel to the nearest wall.
Article
Materials Science, Multidisciplinary
Vasily Kosyanchuk, Artem Yakunchikov
Summary: This paper presents a theoretical study of the aeroseparation effect using event-driven molecular dynamics method. The study focuses on two practical aspects: enhancing binary mixture separation by adding a third light carrier component, and investigating the influence of the position, orientation, and shape of the flow separator on separation efficiency. The results show that virtual skimmers can be used to evaluate the performance of real skimmers, despite their different separation results. It is also demonstrated that the position, orientation, and shape of the skimmer can affect separation performance but can be chosen to minimize deviation from predictions made with virtual skimmers.
Article
Thermodynamics
Xiaodong Cai, Weiqiang Chen, Kaiyan Jin, Ralf Deiterding, Jianhan Liang
Summary: Detonation initiation in supersonic premixed flow was investigated experimentally using hot jets with different strength. Two types of shock interaction models, B/S (bow/separated) and S/S (separated/separated), were observed. The ignition of the combustible mixture in the high-strength hot jet case was triggered by the interaction between jet-induced bow and bottom separated shocks, resulting in the generation of a Mach stem and the initiation of detonation. For the low-strength hot jet, detonation initiation could not be realized by the interaction between bow and separated shocks, and only the separated shock-induced combustion was observed. The interaction of shock surfaces in the flow field was dominated by the upper separated shock, and a V-shaped SSIC/SSIC structure was generated associated with the forward propagation of separated shocks in the supersonic flow.
COMBUSTION AND FLAME
(2023)
Article
Chemistry, Analytical
L. Parellada-Monreal, G. G. Mandayo, A. Martin-Mayor, I Souto-Canteli, M. Mounir Bou-Ali
Summary: This article presents CFD simulation results compared with experimental data to study the evolution of target gas concentration in a test chamber under different working conditions. The results show a good correlation between the simulation results and experimental data, suggesting some assumptions for the behavior.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Review
Chemistry, Multidisciplinary
Jeong Young Park, Hyunhwa Lee, Yujin Park, Kyoungjae Song
Summary: Hot carriers, generated through light excitation of metal nanostructures, play a crucial role in solar energy conversion and catalytic reactions. Adopting a metal-semiconductor platform enables the collection and utilization of these high-energy carriers. Recent experimental studies have demonstrated the enhancing effect of surface plasmons on hot carrier generation. Furthermore, it has been shown that hot carriers can improve solar energy conversion performance and control catalytic activity.
ACCOUNTS OF CHEMICAL RESEARCH
(2022)
Article
Mechanics
Run-ze Yang, Rui Yang, Yu-xin Zhao
Summary: The study numerically investigates the effect of compressibility on supersonic corner flow using Reynolds-averaged Navier-Stokes equations with a full Reynolds stress model. The results show that Mach number has minimal impact on vortex core propagation but positively affects friction coefficient and total pressure loss. Additionally, the proposed geometric transformation for vortex center position and unified formula for total pressure loss distribution have been validated and are crucial for initial design and evaluation of projects with streamwise corners.
Article
Chemistry, Applied
A. Luna-Triguero, J. M. Vicent-Luna, M. J. Jansman, G. Zafeiropoulos, M. N. Tsampas, M. C. M. van de Sanden, H. N. Akse, S. Calero
Summary: This study proposes a zeolite-based separation process to obtain carbon dioxide-neutral fuels and chemicals, combining separation efficiency with low costs. By calculating the separation behavior of mixtures generated by plasmolysis of CO2, a purification process design based on multicomponent adsorption and separation in commercially available zeolites is provided, with NaX and NaY identified as the most suitable zeolites for separation under a wide range of operating conditions.
Review
Physics, Applied
A. Bieberle-Hutter, A. C. Bronneberg, K. George, M. C. M. van de Sanden
Summary: This paper discusses the application of operando attenuated total reflection Fourier-transform infrared (ATR-FTIR) spectroscopy for water splitting, focusing on opportunities, challenges, recent results, and future perspectives. Stable and robust operando ATR-FTIR measurements revealed changes in surface species during water oxidation. Combining ATR-FTIR measurements with microkinetic modeling enables identification of the reaction mechanism in water splitting and accelerates the development of tailored catalysts.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Chemistry, Physical
Rakesh K. Sharma, Hrishikesh Patel, Usman Mushtaq, Vasileios Kyriakou, Georgios Zafeiropoulos, Floran Peeters, Stefan Welzel, Mauritius C. M. van de Sanden, Mihalis N. Tsampas
Summary: Ammonia is an essential precursor for fertilizers and a potential carbon-free energy carrier. A sustainable method for producing ammonia from nitrogen and water using a plasma-activated proton conducting solid oxide electrolyzer has been proposed. This method achieves high ammonia production rates and Faradaic efficiencies.
ACS ENERGY LETTERS
(2021)
Article
Chemistry, Physical
Ruoyu Zhang, Gerben van Straaten, Valerio di Palma, Georgios Zafeiropoulos, Mauritius C. M. van de Sanden, Wilhelmus M. M. Kessels, Mihalis N. Tsampas, Mariadriana Creatore
Summary: This study conducts an in-depth investigation on the electrochemical activation of CoPi-based catalysts, demonstrating that the pristine chemical composition strongly influences its activity in the OER, as well as its changes after prolonged exposure to the electrolyte. The activated CoPi films show an increase in electrochemical active surface area with the number of CV cycles, while phosphorous progressively leaches out from the film.
Article
Electrochemistry
Sathiyaraj Kandhasamy, Georgios Nikiforidis, Gert Jan Jongerden, Ferdy Jongerden, Mauritius C. M. van de Sanden, Mihalis N. Tsampas
Summary: By retuning the catholyte formulation of the intermediate temperature sodium-sulfur battery, lowering the operating temperature and improving cell design, the cell performance was significantly boosted, demonstrating for the first time the practicality of the tubular IT-NaS technology at a temperature as low as 125 degrees C.
Article
Chemistry, Physical
Ilker Tezsevin, Mauritius C. M. van de Sanden, Suleyman Er
Summary: This study performed density functional theory calculations to generate oxygen vacancy formation energy data for a range of cubic perovskite materials, and calculated area-specific resistance data related to oxygen reduction reaction and oxygen ion conductivity. By screening 31 candidate perovskites, the study identified materials with properties between state-of-the-art SOFC cathode and oxygen permeation components. The research also presented an intuitive approach to estimate complex perovskite data by using simple perovskite data, aiming to boost future explorations in diverse energy applications.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Physics, Applied
G. Raposo, A. W. van de Steeg, E. R. Mercer, C. F. A. M. van Deursen, H. J. L. Hendrickx, W. A. Bongers, G. J. van Rooij, M. C. M. van de Sanden, F. J. J. Peeters
Summary: This study quantifies the CO flame band emission in CO2 microwave plasma and reveals a contribution of O-2 Schumann-Runge UV emission at high temperatures. Further analysis demonstrates the high energy efficiency of CO flame band emission at T < 1500K.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Physics, Fluids & Plasmas
P. Viegas, L. Vialetto, A. W. van de Steeg, A. J. Wolf, W. A. Bongers, G. J. van Rooij, M. C. M. van de Sanden, P. Diomede, F. J. J. Peeters
Summary: A method is proposed to spatially resolve discharge parameters using experimental measurements and 1D numerical simulations. The results show that radially-resolved parameters obtained numerically can explain high reactor performances in CO2 conversion.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Alex van de Steeg, Pedro Viegas, Ana Silva, Tom Butterworth, Alexander van Bavel, Joost Smits, Paola Diomede, Mauritius van de Sanden, Gerard van Rooij
Summary: This study investigates the reduction of CO2 to CO for sustainable fuel production in high-temperature microwave plasma, revealing rapid mass and energy transfer mechanisms between products and feedstock, as well as the importance of new CO2 chemistry rate coefficients. Reactor design improvements based on the identified enhancement mechanisms could potentially increase efficiency up to the newly defined thermal limit of 70%.
ACS ENERGY LETTERS
(2021)
Article
Chemistry, Physical
Georgios Zafeiropoulos, Purushothaman Varadhan, Hannah Johnson, Lars Kamphuis, Arunkuman Pandiyan, Sachin Kinge, Mauritius C. M. van de Sanden, Mihalis N. Tsampas
Summary: This study addresses the challenges of depositing narrow band gap metal-oxides on porous substrates as suitable photoelectrodes for PEM-PEC configuration, achieving a high photocurrent density with W-doped BiVO4 photoanode. The successful integration of BiVO4 into PEM-PEC reactor demonstrates solar hydrogen production from ambient air, showing promise for low-cost and large-scale solar hydrogen production.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Physical
A. W. van de Steeg, L. Vialetto, A. F. Sovelas da Silva, P. Viegas, P. Diomede, M. C. M. van de Sanden, G. J. van Rooij
Summary: Thermalization of electron and gas temperature in CO2 microwave plasma is revealed for the first time through Thomson scattering measurements. The results contradict the prevailing understanding of increasing electron temperature causing discharge contraction. The study demonstrates that associative ionization of radicals plays a significant role in the thermalization process of the plasma, providing a basis for ab initio prediction of power concentration in plasma reactors.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Physics, Fluids & Plasmas
L. Vialetto, A. W. van de Steeg, P. Viegas, S. Longo, G. J. van Rooij, M. C. M. van de Sanden, J. van Dijk, P. Diomede
Summary: This work investigates the kinetics and transport of CO2 microwave plasmas through simulation results and experiments. The simulation results are validated against experimental measurements and the study reveals the effects of gas heating and charged species variation at different pressures.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Hanyu Ma, Rakesh K. Sharma, Stefan Welzel, Mauritius C. M. van de Sanden, Mihalis N. Tsampas, William F. Schneider
Summary: This study investigates the synergy between heterogeneous catalysts and non-thermal plasma. Through experimental evidence and reactor model construction, it is revealed that neither catalyst nor plasma alone is productive, but their combination can generate nitrogen oxides. The study provides clear evidence for the synergy between heterogeneous catalysts and non-thermal plasma, and highlights the importance of their combined use.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Applied
V. Guerra, T. Silva, N. Pinhao, O. Guaitella, C. Guerra-Garcia, F. J. J. Peeters, M. N. Tsampas, M. C. M. van de Sanden
Summary: This work discusses the potential of combining non-thermal plasmas and conducting membranes for in situ resource utilization on Mars by converting molecules from the Martian atmosphere to create necessary feedstock and base chemicals. Different plasma sources operate on different principles and mechanisms, allowing for exploration of various energy transfer pathways for CO2 dissociation. The coupling of plasmas with membranes is anticipated to have a synergistic effect for high rates of production of molecules per kilogram of instrumentation sent to space.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Usman Mushtaq, Stefan Welzel, Rakesh K. Sharma, M. C. M. van de Sanden, Mihalis N. Tsampas
Summary: A method to overcome fabrication challenges for the development of efficient and robust electrode-supported P-SOCs (protonic ceramic solid oxide cells) was discussed. The study optimized material synthesis and fabrication procedures and evaluated the performance and stability of the cells.
ACS APPLIED MATERIALS & INTERFACES
(2022)
