Article
Energy & Fuels
Weiqi Fu, Jing Yu, Yang Xiao, Chenglai Wang, Bingxiang Huang, Baojiang Sun
Summary: A novel model is proposed to predict the pressure drop of hydrate slurry bubbly flow based on the energy dissipation theory. The reliability of the model is validated using published data.
Article
Energy & Fuels
Pavel G. Struchalin, Vegar H. Oye, Pawel Kosinski, Alex C. Hoffmann, Boris Balakin
Summary: This article discusses a flow loop study on the risk of cohesive particle slurries in subsea petroleum production. The study focuses on a slurry with ice particles consistent with 0.23-mm size in decane. The experiments showed that increased viscosity of the slurry led to higher pressure drops and the formation of plugs, with particle concentration also influencing plug formation.
Article
Energy & Fuels
Xiaofang Lv, Jie Zhang, Yang Liu, Qianli Ma, Jiawen Xu, Shidong Zhou, Shangfei Song, Bohui Shi
Summary: Euler models suitable for hydrate slurry flow were established based on particle dynamics theory. The study found that the distribution of velocity, particle concentration, and turbulent kinetic energy in a curved pipe was more asymmetrical compared to a straight pipe. The increase in particle size led to increased velocity heterogeneity and concentration gradient, and the pressure drop factor increased with velocity, particle concentration, and particle size along the pipeline.
Article
Energy & Fuels
Shuai Wang, Changrui Shi, Huiquan Liu, Lunxiang Zhang, Jiafei Zhao, Yongchen Song, Zheng Ling
Summary: This study demonstrates a simple strategy to fabricate composite aerogels for boosting CO2 hydrate formation using natural vermiculite and MXene nanosheets. The research finds that by controlling the mass ratio of vermiculite and MXene, the structure and surface functional groups of the aerogels can be finely tuned, leading to enhanced CO2 storage capacity and hydrate formation kinetics.
Article
Chemistry, Multidisciplinary
Nikita Orekhov, Nikolay Kondratyuk, Mikhail Logunov, Alexandra Timralieva, Vladimir Shilovskikh, Ekaterina Skorb
Summary: This study provides molecular insights into the self-assembly of melamine cyanurate in aqueous solution and identifies mechanisms of aggregation. The research suggests that the formation of small M-CA complexes is mainly stabilized through aromatic p-p stacking rather than hydrogen bond formation. It also demonstrates that changing the concentration ratio of M to CA leads to a variation in the structure of critical nuclei, indicating a potential for the programmable design of functional supramolecular materials.
CRYSTAL GROWTH & DESIGN
(2021)
Article
Meteorology & Atmospheric Sciences
R. Paul Lawson, Alexei V. Korolev, Paul J. DeMott, Andrew J. Heymsfield, Roelof T. Bruintjes, Cory A. Wolff, Sarah Woods, Ryan J. Patnaude, Jorgen B. Jensen, Kathryn A. Moore, Ivan Heckman, Elise Rosky, Julie Haggerty, Russell J. Perkins, Ted Fisher, Thomas C. J. Hill
Summary: This study investigates the impact of the secondary ice process (SIP) on collision-coalescence in cumulus congestus clouds. Through measurements over the central United States, it is found that ice nucleating particles and cloud droplet concentration significantly affect the rate of collision-coalescence. Additionally, high concentrations of aerosol and cloud-base droplets attenuate the coalescence rate.
BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY
(2023)
Article
Energy & Fuels
Xiao-Hui Wang, Xiao-Jie Xu, Jin Cai, Hua-Xing Zheng, Xing-Xun Li, Wei-Xin Pang, Chang-Yu Sun, Guang-Jin Chen
Summary: This study investigated the influence of dissolved gas concentration on gas hydrate formation and established an equivalent driving force model and a predictive model for induction time. The experimental results showed that maintaining a certain pressure can accelerate hydrate formation, and different residual gas concentrations in the solution can affect the induction time. Additionally, a heat treatment under the same pressure conditions resulted in an increase in the induction time of subsequent hydrate reformation, indicating the presence of residual water structures in the solution, known as the memory effect.
Article
Engineering, Mechanical
F. A. Rayhan, R. Rizal
Summary: This work investigates the pressure drop and non-Newtonian behavior of ice slurry with methanol in a horizontal pipe, and reveals the effects of flow velocity, initial concentration, and ice mass fraction on the flow characteristics. Existing fluid models show poor predictability, so a new model is developed and successfully predicts the experimental data.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2022)
Article
Environmental Sciences
Ted Hullar, Theo Tran, Zekun Chen, Fernanda Bononi, Oliver Palmer, Davide Donadio, Cort Anastasio
Summary: Photochemical reactions in snow and ice play an important role in removing pollutants from the atmosphere and releasing photoproducts into the air. This study measured the photodegradation rate constants of three dimethoxybenzene isomers under different conditions and found significant enhancements in LLRs and at the air-ice interface compared to aqueous solution. Computational modeling suggests that changes in light absorbance and more efficient photodecay are the major factors contributing to the rate enhancements at the air-ice interface.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Article
Environmental Sciences
Guilu Zeng, Rumin Yang, Zhengyuan Zhou, Jingyao Huang, Muhammad Danish, Shuguang Lyu
Summary: This study investigated the degradation performance of naphthalene (NAP) in aqueous solution and soil slurry medium using nano zero valent iron (nZVI) combined with citric acid (CA) activation in peroxodisulfate (PDS) and peroxymonosulfate (PMS) oxidation systems. The results showed that NAP could be degraded by 98.1% and 98.9% in the PDS/nZVI/CA and PMS/nZVI/CA systems within 2 hours. In addition, the presence of CA promoted the dissolution of soil minerals and the desorption of NAP from soil medium. The existence of dissolved organic matter (DOM) in soil facilitated the Fe(II)/Fe(III) cycle and electron transfer during NAP degradation.
Article
Chemistry, Physical
Ali Rasoolzadeh, Ali Bakhtyari, Mohammad Reza Sedghamiz, Jafar Javanmardi, Khashayar Nasrifar, Amir H. Mohammadi
Summary: A rigorous predictive model for calculating water activity in the presence of ionic liquids (ILs) is proposed and applied in the prediction of gas hydrate stability conditions. The model accounts for both short-range interactions and long-range electrostatic interactions and has been validated with data, demonstrating its superiority.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Energy & Fuels
Shengchun Liu, Ming Song, Ling Hao, Pengxiao Wang
Summary: Numerical simulation was conducted to study the flow of ice slurry in horizontal straight tubes, revealing that adjusting viscosity can reduce the deviation between simulation and experimental data. Two mathematical correlations between viscosity and flow velocity were developed, suggesting that future rheological models of ice slurry should be considered in three sections determined by flow velocity.
FRONTIERS IN ENERGY
(2021)
Article
Energy & Fuels
Biao Liu, Linsen Zhan, Hailong Lu, Xindi Lu, Wenjiu Cai
Summary: In this study, the formation mechanism of THF hydrate was investigated using low-field NMR. A quantitative relationship between NMR T-2 and the mass of THF hydrate was established. The results showed that T-2 of THF solution was controlled by temperature and THF concentration, and the formation of THF hydrate was influenced by temperature and THF concentration.
Article
Thermodynamics
Kouki Mekaru, Takuto Miyagi, Ayaka Mishima, Isami Uehara, Ryo Ohmura, Keita Yasuda
Summary: This study investigated the four-phase equilibrium conditions of carbon dioxide + cyclopentane double clathrate hydrate forming systems coexisting with sodium chloride aqueous solution or pure water. The results showed that the double clathrate hydrate is more thermodynamically stable than simple clathrate hydrates under a given sodium chloride concentration.
JOURNAL OF CHEMICAL THERMODYNAMICS
(2024)
Article
Chemistry, Physical
Peng Cheng, Yu Liu, Lei Yang, Xue Wang, Yanbin Chi, Honglin Yuan, Shaobin Wang, Yong-Xiang Ren
Summary: The study highlights the potential of katoite as a novel adsorbent for phosphate removal and recovery from wastewater. It shows high adsorption capacity, selectivity, and possible application as a slow-release phosphorus fertilizer.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Review
Thermodynamics
Shuling Guo, Ankuo Zhang
Summary: Low-temperature biopreservation is commonly used for medication storage to prolong their shelf life. However, cryo-injury can occur during cryopreservation, making it crucial to find a way to achieve long-term biopreservation without causing harm. The optimal storage temperature for different biomaterials should be investigated to improve storage efficiency. This review discusses the mechanisms of cryo-injury and biopreservation, as well as the reasons for storing biological tissues at various temperature zones. It provides valuable insights for the development of biostorage technology.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2024)
Article
Thermodynamics
M. Mohsin Tanveer, Craig R. Bradshaw, Joe Orosz, Greg Kemp
Summary: This study investigates the optimal geometric parameters for a spool compressor using simulation models, and the results indicate that a eccentricity ratio of 0.75 and L/D ratios between 1-1.5 can maximize the volumetric and isentropic efficiencies.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2024)
Article
Thermodynamics
Kongkuai Ying, Zhenhua Jiang, Wenting Wu, Jinjian Chu, Shaoshuai Liu, Yinong Wu
Summary: The Stirling/pulse tube cryocooler (SPC) is a highly efficient and long-lasting cryocooler for space applications. It has the ability to adjust the inter-stage refrigeration capacity dynamically by controlling the Stirling displacer in the first stage. This paper proposes an SPC with a second-stage active phase shifter (APS) that can control the phase difference at the second-stage hot end in real time. The experimental results show that the SPC with the APS can provide refrigeration capacity at different temperatures, with a minimum temperature of 13.5K.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2024)
Article
Thermodynamics
Ligeng Li, Hua Tian, Kai Liu, Yibo Wu, Xuan Wang, Xingyu Liang, Gequn Shu
Summary: This study focuses on improving the performance of carbon dioxide refrigeration systems by introducing a multi-ejector design with three controllable ejectors. Experimental analysis shows that the system's performance can be significantly improved by adopting an optimum pressure control strategy under different operating conditions.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2024)
Article
Thermodynamics
Joseph Al Khoury, Rabih Al Haddad, Ghiwa Shakrina, Christelle Bou Malham, Haytham Sayah, Chakib Bouallou, Maroun Nemer
Summary: This study investigates two implementation methods for calculating refrigerant thermodynamic properties and compares their performance. The results show that the implicit fitting method significantly speeds up simulation time and offers greater flexibility for modeling complex energy systems.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2024)
Article
Thermodynamics
Mariella Mateo-Villanueva, Rodolfo Echarri
Summary: This article details three models of different complexity levels for predicting the cold production of a solar cooling device and compares their advantages and disadvantages. The results show that the transient model underestimates the cold generation, while the equilibrium model and universal model overestimate it. The transient model is a useful tool for analyzing the impact of different variables in a solar adsorption refrigeration system, while the simpler models can be used for preliminary design and feasibility studies.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2024)
Article
Thermodynamics
Amin M. Elsafi, Majid Bahrami
Summary: The novel spherical micro-absorbers offer high sorption capacity and surface-to-volume ratios, solving issues such as solution carryover and corrosion associated with conventional absorbers.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2024)
