Article
Thermodynamics
Isidro Cachadina, Ariel Hernandez, Angel Mulero
Summary: A new temperature-dependent correlation for the reduced influence parameter of the density gradient theory is proposed and compared with other correlations in the literature. The correlation shows a small overall absolute deviation and performs similarly to a previous proposal.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Multidisciplinary Sciences
Ilyas Al-Kindi, Tayfun Babadagli
Summary: Experimental data showed a deviation in propane vapour pressures in capillary media compared to bulk conditions, with rock samples exhibiting vapour pressures 15% lower than those modelled by PR-EOS.
SCIENTIFIC REPORTS
(2021)
Article
Thermodynamics
Lukas Satura, Maria Minichova, Michal Pavelka, Juraj Kosek, Alexandr Zubov
Summary: Density gradient theory describes the evolution of diffuse interfaces by minimizing the total free energy and can provide the equilibrium shape of the interface. In this paper, a robust physics-based numerical approach is developed for determining interface density profiles, which is validated using experimental data.
JOURNAL OF NON-EQUILIBRIUM THERMODYNAMICS
(2022)
Article
Acoustics
Dui Qin, Shuang Lei, Bo Chen, Zhangyong Li, Wei Wang, Xiaojuan Ji
Summary: This study investigates the effects of equation of state (EOS) on the cavitation dynamics of an air-vapor mixture bubble. The results show that the Peng-Robinson (PR) EOS provides a more accurate estimation of the gases within the bubble compared to the Van der Waals (vdW) EOS. Moreover, the Gilmore-PR model predicts a stronger bubble collapse with higher temperature, pressure, and water molecules within the collapsing bubble compared to the Gilmore-vdW model.
ULTRASONICS SONOCHEMISTRY
(2023)
Article
Computer Science, Interdisciplinary Applications
Yuze Zhang, Xuguang Yang, Lei Zhang, Yiteng Li, Tao Zhang, Shuyu Sun
Summary: With the increasingly accurate modeling and simulation demands, a new method for phase equilibrium prediction is proposed to resolve the shortages in computational efficiency and stability in the conventional iterative flash calculation. This method uses the HiSD algorithm and the Rosenbrock-Euler ETD format to calculate the saddle points and simplify the phase equilibrium calculations.
JOURNAL OF COMPUTATIONAL PHYSICS
(2023)
Article
Physics, Applied
Ti-Wei Xue, Zeng-Yuan Guo
Summary: In this paper, an ideal dense matter equation of state (EOS) that is symmetric to the ideal gas EOS is proposed. The ideal dense matter EOS makes no assumptions about the structure of matter and is general. By studying specific work and physical constants, it is found that the ideal dense matter EOS has the same theoretical location as the ideal gas EOS.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Thermodynamics
Hiroaki Matsukawa, Tomoya Tsuji, Katsuto Otake
Summary: Equations of state (EoS) can be used to estimate physical properties, but there is limited verification on the applicability of parameter sets. This study measured densities of CO2/Tol mixtures and correlated them to three EoS, finding that SL and PC-SAFT EoS were more accurate in predictions than PR EoS. Using parameter sets from density measurements, VLE and density estimations were successfully done with SL and PC-SAFT EoS, while PR EoS was not predictive. Basic data for determining pure component parameters are crucial when estimating density using EoS.
JOURNAL OF CHEMICAL THERMODYNAMICS
(2022)
Article
Energy & Fuels
Fabio P. Nascimento, Veronica J. Pereira, Renan P. Souza, Rui C. A. Lima, Gloria M. N. Costa, Paulo T. V. Rosa, Ana F. Forca, Silvio A. B. Vieira de Melo
Summary: In this study, the PVT properties of a crude oil from the Brazilian pre-salt layer were experimentally investigated, and the calculated results using PR-EoS were found to be in agreement with the experimental data. The experimental data showed a decrease in AOP and an increase in BP as temperature rises.
Article
Thermodynamics
Ziqing Pan, J. P. Martin Trusler
Summary: Interfacial tension (IFT) is an important property in enhanced oil recovery (EOR) and carbon geological storage (CGS), supporting the interpretation of multiphase flow and wetting behavior and facilitating reservoir simulation. This study investigates the effect of contrast agents on IFT using pendant-drop experiments and modeling, providing quantitative data on IFT between different phases and proposing a workflow for estimating IFT between gas, brine, and doped hydrocarbon systems.
FLUID PHASE EQUILIBRIA
(2022)
Article
Chemistry, Physical
Sarra Zid, Jean-Patrick Bazile, Jean-Luc Daridon, Andres Pina-Martinez, Jean-Noel Jaubert, Stephane Vitt
Summary: Experimental study on the phase behavior of CO2 + 2,3-dimethylbutane binary mixture reveals continuous vapor-liquid critical locus between the two pure compounds, showing type I or II behavior. The experimental data can be satisfactorily represented by the Peng-Robinson equation of state with a temperature-dependent binary interaction parameter.
JOURNAL OF SUPERCRITICAL FLUIDS
(2022)
Article
Chemistry, Multidisciplinary
Gholamhossein Sodeifian, Maryam Arbab Nooshabadi, Fariba Razmimanesh, Amirmuhammad Tabibzadeh
Summary: Nowadays, supercritical fluids (SCFs) technologies are being used to obtain new products with remarkable characteristics. This study measured the high-pressure solubility of the pain reliever buprenorphine hydrochloride in supercritical carbon dioxide (scCO(2)) for the first time and obtained the thermodynamic parameters of its dissolution. Suitable models for predicting solubility data were identified.
ARABIAN JOURNAL OF CHEMISTRY
(2023)
Article
Computer Science, Interdisciplinary Applications
Bradley Boyd, Dorrin Jarrahbashi
Summary: Spurious pressure oscillations are a common numerical instability in multiphase and multicomponent flow problems, which can be reduced by reconstructing primitive variables in characteristic space and artificially thickening the interface between different species. The proposed HY model effectively decreases the magnitude of spurious pressure oscillations and energy conservation loss in various tested cases.
COMPUTERS & FLUIDS
(2021)
Article
Energy & Fuels
Jing-Fa Li, Bo Yu, Dao-Bing Wang, Shu-Yu Sun, Dong-Liang Sun
Summary: An efficient multigrid-DEIM semi-reduced-order model is developed for accelerating simulation of unsteady single-phase compressible flow in porous media. The model combines computations in both full-order space and reduced-order subspace, achieving significant acceleration without compromising computational accuracy.
Article
Chemistry, Multidisciplinary
Jiwan Seo, Jae Seung Kim, Kyu Hong Kim
Summary: JP-10 is an important fuel in the petroleum and aviation industries due to its high specific impulse. Therefore, accurate and efficient prediction of its thermodynamic properties is crucial for high-fidelity computational analysis.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Computer Science, Interdisciplinary Applications
Xiaoyu Feng, Meng-Huo Chen, Yuanqing Wu, Shuyu Sun
Summary: This article proposes a fully explicit and unconditionally energy-stable scheme for volume-temperature flash calculation. By combining the dynamic model and the linear semi-implicit scheme, the moles and volume can be updated with the preservation of energy-dissipation feature at a discrete level. The scheme shows promising potential and significantly reduces the implementation burden in certain engineering scenarios.
JOURNAL OF COMPUTATIONAL PHYSICS
(2022)
Article
Mathematics, Applied
Junfeng Cao, Ke Chen, Huan Han
Summary: This paper proposes a two-stage image segmentation model based on structure tensor and fractional-order regularization. In the first stage, fractional-order regularization is used to approximate the Hausdorff measure of the MS model. The solution is found using the ADI scheme. In the second stage, thresholding is used for target segmentation. The proposed model demonstrates superior performance compared to state-of-the-art methods.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2024)
Article
Mathematics, Applied
Dylan J. Oliver, Ian W. Turner, Elliot J. Carr
Summary: This paper discusses a projection-based framework for numerical computation of advection-diffusion-reaction (ADR) equations in heterogeneous media with multiple layers or complex geometric structures. By obtaining approximate solutions on a coarse grid and reconstructing solutions on a fine grid, the computational cost is significantly reduced while accurately approximating complex solutions.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2024)
Article
Mathematics, Applied
Nathan V. Roberts, Sean T. Miller, Stephen D. Bond, Eric C. Cyr
Summary: In this study, the time-marching discontinuous Petrov-Galerkin (DPG) method is applied to the Vlasov equation for the first time, using backward Euler for a Vlasov-Poisson discretization. Adaptive mesh refinement is demonstrated on two problems: the two-stream instability problem and a cold diode problem.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2024)
Article
Mathematics, Applied
Yizhi Sun, Zhilin Sun
Summary: This work investigates the convexity of a specific class of positive definite probability measures and demonstrates the preservation of convexity under multiplication and intertwining product. The study reveals that any integrable function on an interval with a polynomial expansion of fast absolute convergence can be decomposed into a pair of positive convex interval probabilities, simplifying the study of interval distributions and discontinuous probabilistic Galerkin schemes.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2024)
Article
Mathematics, Applied
Bhagwan Singh, Komal Jangid, Santwana Mukhopadhyay
Summary: This paper examines the prediction of bending characteristics of nanoscale materials using the Moore-Gibson-Thompson thermoelasticity theory in conjunction with the nonlocal strain gradient theory. The study finds that the stiffness of the materials can be affected by nonlocal and length-scale parameters, and the aspect ratios of the beam structure play a significant role in bending simulations.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2024)
Article
Mathematics, Applied
Guoliang Wang, Bo Zheng, Yueqiang Shang
Summary: This paper presents and analyzes a parallel finite element post-processing algorithm for the simulation of Stokes equations with a nonlinear damping term, which integrates the algorithmic advantages of the two-level approach, the partition of unity method, and the post-processing technique. The algorithm generates a global continuous approximate solution using the partition of unity method and improves the smoothness of the solution by adding an extra coarse grid correction step. It has good parallel performance and is validated through theoretical error estimates and numerical test examples.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2024)
Article
Mathematics, Applied
Hao Xu, Zeng-Qi Wang
Summary: Fluid flow control problems are crucial in industrial applications, and solving the optimal control of Navier-Stokes equations is challenging. By using Oseen's approximation and matrix splitting preconditioners, we can efficiently solve the linear systems and improve convergence.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2024)
Article
Mathematics, Applied
Zhengya Yang, Xuejuan Chen, Yanping Chen, Jing Wang
Summary: This paper focuses on the high-order stable numerical solutions of the time-space fractional diffusion equation. The Fourier spectral method is used for spatial discretization and the Spectral Deferred Correction (SDC) method is used for numerical solutions in time. As a result, a high-precision numerical discretization scheme for solving the fractional diffusion equation is obtained, and the convergence and stability of the scheme are proved. Several numerical examples are presented to demonstrate the effectiveness and feasibility of the proposed numerical scheme.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2024)