Review
Energy & Fuels
Jaya Vignesh Madana Gopal, Robert Morgan, Guillaume De Sercey, Konstantina Vogiatzaki
Summary: Computational Fluid Dynamics (CFD) frameworks for supercritical cryogenic fluids rely on Real Fluid models to accurately simulate thermal and inertial driven mechanisms. Accurate estimation of density and thermodynamic properties is crucial for replicating thermo and fluid dynamics.
Article
Engineering, Multidisciplinary
K. J. Petersen, S. Rahbarimanesh, J. R. Brinkerhoff
Summary: This article reviews the current methods for modeling the complex physical processes involved in the storage, transport, and spills of cryogenic fluids, with specific focus on cavitation and pool boiling. Deficiencies in the current modeling approaches are highlighted, and strategies for improving the modeling of cryogenic liquids in real-world environments are discussed.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Engineering, Chemical
Seyedsajjad Jazayeri, Afham Pourahmad, Seyyed Amirreza Abdollahi, Amin. Hassanvand, Falah Alobaid, Babak Aghel
Summary: In this research, experimental investigation and CFD simulation were conducted on a cryogenic condenser for oxygen liquefaction, using liquid nitrogen as a cooling fluid. A three-dimensional model with a structured mesh and the VOF method were used to study the multi-phase flow inside the condenser. The study also assessed the vapor generation rate during the condensation of oxygen and compared the simulation results with experimental data, with an average deviation of 17%.
Article
Thermodynamics
Xujin Qin, Chuiju Meng, Yonghua Huang
Summary: Thermodynamic vent system (TVS) is a promising method for controlling pressure in cryogenic propellant tanks in microgravity environments. A new model that considers flash evaporation effect has been developed to more accurately simulate the transient liquid-vapor phase change and heat transfer during the TVS depressurization. The model has also been used to analyze the efficiency of the TVS in reducing propellant loss and suggests that increasing heat exchanging area, reducing orifice diameter, or narrowing pressure control band can improve efficiency.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Xiaowen Ren, Hongyu Chen, Ping Li, Yushan Gao, Shang Liu
Summary: This study proposed a 7-equation two-fluid model to investigate the inert gas purge process during the start-up of liquid rocket engines. Numerical simulations were conducted to analyze the reasons for pressure surges and examine the effect of inlet pressure and purging pressure on filling characteristics in the supply system.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2022)
Article
Engineering, Aerospace
Zhengyu Song, Qingsong Zhang, Cong Wang, He Yuan, Jinglin Li
Summary: For missions to sun-synchronous orbits, regulating the time distribution of flight phases can improve load-carrying capacity, but shortens engine burn time. This paper introduces technologies to ensure reliable engine restart after coasting with limited propellants. The influence of different flight profiles on carrying capacity is analyzed. A joint simulation method is proposed to analyze propellant sloshing under microgravity conditions. A guidance method is studied to suppress propellant sloshing during coasting phase. These technologies were successfully applied in the LM-8/Y2 mission to improve performance.
Article
Mechanics
S. Tajfirooz, J. G. Meijer, R. A. Dellaert, A. M. Meulenbroek, J. C. H. Zeegers, J. G. M. Kuerten
Summary: An Euler-Lagrange approach is presented for simulating the magneto-Archimedes separation of nearly neutrally buoyant spherical particles in a paramagnetic liquid. The study shows that particle interactions and history effects significantly influence the separation performance, while particle size and initial distribution also play a role in the separation time.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Agriculture, Multidisciplinary
Binbin Wang, Lei Zhang, Yuan Yuan, Zhiqi Zhao, Haijiao Nan
Summary: This paper proposes a novel arrangement method for shiitake mushrooms by establishing a dynamic model and using computational fluid dynamics to analyze their motion states, improving processing efficiency, and optimizing the device for stable arrangement with the stipe pointing upward.
COMPUTERS AND ELECTRONICS IN AGRICULTURE
(2022)
Article
Chemistry, Multidisciplinary
Kyubae Lee, Wungrak Choi, Si Yeong Kim, Eon-Bee Lee, Won Take Oh, Jeongeun Park, Chan Hee Lee, Jihei Sara Lee, Hyoung Won Bae, Dong-Su Jang, Kang Suk Lee, Se Won Yi, Mi-Lan Kang, Chan Yun Kim, Hak-Joon Sung
Summary: This study proposes a potential solution to control changes in intraocular pressure in glaucoma patients by adjusting the tube diameter using shape memory polymer and clinical laser systems. The design includes a drug-releasing gel coating and a safety lock ring to achieve three-step control of intraocular pressure. The design and functions are validated using computational and animal models.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Applied
Ning Liu, Mingliang Sun, Yanping Shen
Summary: Regenerative liquid propellant guns have been studied for many years, and the issue of large pressure oscillations has been observed. To address this issue and promote the application of liquid propellant in guns, a low pressure firing system called regenerative liquid propellant mortar (RLPM) has been developed. A multiphase multidimensional fluid-dynamics model has been used to study the interior ballistic properties of RLPM. Experimental results show that the liquid propellant combustion oscillations are effectively suppressed, and the simulation results agree well with the experimental data.
PROPELLANTS EXPLOSIVES PYROTECHNICS
(2023)
Article
Chemistry, Multidisciplinary
Viola Rossano, Giuliano De Stefano
Summary: In this study, a hybrid VOF-Lagrangian method is proposed and tested for simulating the aerodynamic breakup of liquid droplets induced by a traveling shock wave. The method accurately predicts droplet deformation, fragmentation, and mist development, by combining volume-of-fluid technique and discrete phase model. The results show good agreement with reference experiments and high-fidelity numerical simulations, demonstrating the effectiveness and efficiency of the proposed computational approach for fluids engineering applications.
APPLIED SCIENCES-BASEL
(2022)
Article
Thermodynamics
Yafeng Niu, Lulu Hu, Pengfan Chen, Yingwen Liu, Bo Gao
Summary: Thermoacoustic oscillations are common in combustion devices and cryogenic systems, causing system instability and other issues. However, there are limited studies on the thermoacoustic oscillation of complex structures in actual cryogenic systems, posing challenges in suppressing thermoacoustic instability. This study focuses on the T-shaped helium tube in the real cryogenic system and investigates the oscillation characteristics of the complex cryogenic thermoacoustic system. Mode transition phenomena occur with changes in branch position and length. The study provides insights into the effects of branch position and length on the amplitude and frequency of each mode and proposes methods to suppress self-excited oscillation in the T-shaped tube.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Mechanics
Shanqin Jin, Heather Peng, Wei Qiu, Chad Oldfield, Barton Stockdill
Summary: This paper presents the development of best Reynolds-Averaged Navier-Stokes (RANS) modeling practices for simulations of propeller-hull interaction using Star-CCM+. The best propeller modeling methods and parameters were recommended based on convergence studies and validation experiments.
Article
Engineering, Biomedical
Bryan C. Good, Sailahari V. Ponnaluri, William J. Weiss, Keefe B. Manning
Summary: Computational fluid dynamics modeling of the Penn State Fontan Circulatory Assist Device (FCAD) shows promising results in terms of hemolysis and thrombosis resistance, supporting its potential for successful application in long-term mechanical support for failing Fontan patients.
Article
Engineering, Mechanical
P. Csizmadia, S. Till, Gy. Paal
Summary: This paper presents CFD-based results on loss estimation in bends for single-phase, incompressible Bingham fluids. Five fittings of different R/D ratios were investigated, and the study covered a wide range of Hedstrom numbers. Loss coefficients were given as functions of the generalized Reynolds number and the generalized Dean number. The study revealed that low generalized Dean numbers resulted in losses purely caused by wall friction, while higher generalized Reynolds and Dean numbers showed separated loss coefficients based on Hedstrom numbers.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2023)