Article
Energy & Fuels
Hui-Shu Liu, Ji-Miao Duan, Jiang Li, Jian Wang, Hao Yan, Ke-Yu Lin, Ke-Cheng Gu, Chang-Jun Li
Summary: Wax deposition in oil-water stratified flow can significantly affect the transportation capacity of oil in pipe systems. This study developed a robust three-dimensional model to predict wax deposition in circular pipe flow. The model was based on the rheology principles and incorporated hydrodynamics and heat/mass transfer simulations. The predictions showed good agreement with experimental data for different oil types and water cuts. The study also analyzed the deposition distribution in the circumferential direction and found that the thickness of deposits near the oil-water interface quickly dropped to zero.
Article
Thermodynamics
Djamila Derbal, Mohamed Bouzit, Abderrahim Mokhefi, Faycal Bouzit
Summary: This paper presents a numerical investigation of nanofluid two-phase flow in a curved duct with enlarged cross section, focusing on the impact of inertia, mass diffusion, and alumina nanoparticles concentration on fluid flow and heat transfer. The results show that in addition to Dean's vortices, the enlarged duct configuration leads to the emergence of vortices resulting from flow reattachment. Higher Reynolds numbers enhance heat transfer, while the addition of alumina nanoparticles enhances heat transfer by 15% compared to pure water. The increase in the Lewis number does not significantly influence heat transfer rate, but promotes a more homogeneous distribution of nanoparticles.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Mechanics
Chuanshuai Dong, Ronghui Qi, Lizhi Zhang
Summary: This paper develops a novel mechanistic model for flow and heat transfer in two-phase slug flow in horizontal pipes. The model is validated by experimental results and comprehensively investigates the dependence of heat transfer performance on overall and local flow parameters.
Article
Mechanics
Faith R. Beck, Lokanath Mohanta, Diane M. Henderson, Fan-Bill Cheung, Gita Talmage
Summary: This paper examines the stability of an unsteady two-phase flow with heat and mass transfer using coupled Mathieu equations. It finds that the flow is mathematically unstable to all perturbative wavenumbers, but there are regions of stability for practical engineering purposes. The concept of engineering stability is quantified based on the solution's growth behavior and doubling-time, providing a method for application to other engineering stability problems.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2021)
Article
Energy & Fuels
Zhiqi Wang, Meimei Han, Zhengfei Zhu, Yu Jiang, Lin Jiang
Summary: Clean energy is highly beneficial for manufacturing 4.0. This study focuses on investigating the atomization mass transfer inside tobacco flavoring machines to design energy storage parameters for a PCM-based solar energy storage system. Simulation technology is used to visualize the nozzle atomization and analyze its characteristics. The results are validated through contour experiments, providing a theoretical basis for the design of the PCM-energy storage system.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Thermodynamics
Yuqi Huang, Haipeng Chen, Yidong Fang
Summary: Studying the influence of oscillation parameters on heat transfer in Faraday waves is important for evaluating the dynamic behavior and safety of thermal management systems in automobiles, ships, and aircraft.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Haoran Zhou, Kai Meng, Wenshang Chen, Ben Chen
Summary: This study developed a model of a three-dimensional, two-phase, non-isothermal proton exchange membrane (PEM) water electrolyzer to investigate the water and heat distribution characteristics and the effects of various parameters on heat and mass transfer and electrolyzer performance. The results showed that the performance of the electrolyzer depended on the combined effect of heat and mass, particularly at high voltages. Increasing the inlet velocity accelerated bubble discharge but led to a larger temperature drop and performance degradation. Increasing the inlet temperature improved the reaction rate and reduced the membrane resistance, thus promoting performance improvement. The contact angle and porosity of the anode gas diffusion layer (A-GDL) affected the transport of liquid water and performance, with an optimal porosity range of 0.5 to 0.6.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Thermodynamics
Shahab Mirjalili, Suhas S. Jain, Ali Mani
Summary: This article discusses the interface transfer issue in two-phase flows involving heat/mass transfer. Two models are proposed to address the challenge of the undefined interface in phase field models, and their consistency, accuracy, and convergence are validated through numerical simulations. The results suggest that the two-scalar model is more accurate than the one-scalar model in cases with large diffusivity ratios.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Nuclear Science & Technology
Jie Fan, Junli Gou, Jianqiang Shan, Li Ge, Pan Wu
Summary: A two-fluid three-field model for vertical upward flow was developed in this research to study the performance of droplets in annular-mist flow and heat transfer under reflooding conditions. The model was evaluated and validated through simulations of various experiments, showing that it provides more accurate results compared to an additional two-fluid model.
PROGRESS IN NUCLEAR ENERGY
(2021)
Article
Thermodynamics
Bo Yang, Weixing Yuan
Summary: There is great potential for recovering waste heat from gas boiler exhaust flue gas. This paper proposes a two-stage membrane waste heat recovery technology to increase the heating capacity of district heating networks. The system achieves a total heat recovery efficiency of 77.0% and a thermal efficiency of 105.4% at a DHN water temperature of 40 degrees C.
APPLIED THERMAL ENGINEERING
(2022)
Article
Energy & Fuels
Xin Lv, Xiaojiang Li, Yang Ge, Qingping Li, Hongsheng Lu
Summary: The study proposes a method for separating paraffin wax using Span 80 and TMHDA, achieving sustainable separation of the wax through a switchable emulsification system. The emulsification of the paraffin wax can be improved by increasing the paraffin wax and Span 80 content, and separation of the paraffin wax can be achieved by introducing CO2.
Article
Thermodynamics
Wei Zhang, Jun Cheng, Zhenhua Chen, Wanhua Chen, Rong Gao
Summary: Accurate control and rapid regulation of the liquid nitrogen supplying pressure are crucial for the total temperature operation of the cryogenic wind tunnel. Experimental measurements and numerical simulations were conducted to study the pressure evolution and gas-liquid transfer in the cryogenic accumulator. The results showed that the numerical model can effectively simulate the complex heat and mass transfer characteristics inside the accumulator and provide theoretical guidance for injection pressure control.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
R. W. Morse, T. A. Moreira, J. Chan, K. M. Dressler, G. Ribatski, E. T. Hurlburt, L. L. McCarroll, G. F. Nellis, A. Berson
Summary: The experimental study characterizes the entire liquid-film dryout process in a vertical two-phase annular flow, showing that the dryout heat flux (DHF) is typically 90% of the critical heat flux (CHF), but can be as low as 50% of CHF at very high qualities. The investigation also reveals that the CHF occurs consistently at f(dry) approximate to 0.05.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Engineering, Environmental
Jinlong Zheng, Yong Deng, Yilin Liu, Fuzhong Wu, Wenhao Wang, Heng Wang, Shuya Sun, Jia Lu
Summary: In this work, crosslinked paraffin/polyvinyl alcohol/MXene composite films were prepared by a physical blending method. MXene played a key role in enhancing mechanical strength, light-to-heat conversion efficiency, and thermal conductivity, while maintaining latent heat. The improved flexibility was attributed to MXene nanosheets providing additional hydrogen bond binding sites. The MXene also effectively improved light-to-heat conversion ability and heat transfer rate. The films showed repeatable light-to-heat conversion stability and good compatibility and stability.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Tobias Pyka, Jorg Koop, Christoph Held, Gerhard Schembecker
Summary: This article presents a detailed analysis of dry pressure drop in two-rotor packed beds, providing correlations for the prediction of pressure drop based on the data from one-rotor beds. It offers valuable insights for the design and operation of packed beds.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Energy & Fuels
Aziz Alhejaili, Ponnivalavan Babu, Nagu Daraboina
Article
Energy & Fuels
Jinghao Yang, Yingda Lu, Nagu Daraboina, Cem Sarica
Article
Engineering, Chemical
Gabriel Soto-Cortes, Eduardo Pereyra, Cem Sarica, Fabian Rivera-Trejo, Carlos Torres
Summary: This work provides new experimental data on high viscosity oil-gas flow, analyzing the effects of pipe inclination and liquid viscosity on flow pattern transitions and characterizing subclasses of annular flow pattern. Comparisons with existing models show disagreements, highlighting the need for further studies on the effects of viscosity and pipe inclination in liquid-gas downward flow mixtures.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Engineering, Chemical
Gabriel Soto-Cortes, Eduardo Pereyra, Cem Sarica, Fabian Rivera-Trejo, Carlos Torres
Summary: This study investigates the holdup and pressure gradient behavior of high viscosity oil-gas flow in inclined downward flow, highlighting the transport mechanism through phase slippage and mechanical energy balance. Performance analysis of available mechanistic models reveals the need for a detailed study of the effects of viscosity and pipe inclination in liquid-gas mixtures.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Energy & Fuels
Ponnivalavan Babu, Chandradeep Bollineni, Nagu Daraboina
Summary: Managing produced water is a significant environmental issue in the energy industry, with reverse osmosis and thermal distillation being commonly used techniques. Hydrate-based desalination shows promise as a low energy option, with external refrigeration identified as a major contributor to energy consumption.
Review
Energy & Fuels
Ahmed Al-Hosani, Sriram Ravichandran, Nagu Daraboina
Summary: The study provides a comprehensive review of asphaltene deposition modeling and discusses potential improvements for current models. It highlights the impact of asphaltene precipitation on pore blockage, particle size increase, and production decline, emphasizing the importance of understanding asphaltene structure and thermodynamic properties. By comparing models in the literature, it points out the need for further improvement in the universality of different models.
Review
Energy & Fuels
Elijah Bell, Yingda Lu, Nagu Daraboina, Cem Sarica
Summary: Solid deposition in flow-lines poses a significant challenge for offshore operations, leading to reduced production and increased costs when flow blockage occurs. Thermal management methods, including passive and active approaches, have been developed to ensure flow during production. Passive methods involve insulation and pipeline burial, while active methods require heating techniques to maintain or raise the temperature of the fluid.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2021)
Editorial Material
Energy & Fuels
Aziz Alhejaili, Nagu Daraboina
Summary: The original paper mainly focused on the thermodynamic equilibrium of semiclathrate hydrate formation in the presence of salts common in produced water, finding that TBAB hydrate formation is highly favorable. While there were criticisms of some inaccuracies and omissions in the paper, we believe they were based on a misunderstanding of our objectives and analysis, and acknowledge the need for more information in the original paper.
Article
Energy & Fuels
Elijah Bell, Yingda Lu, Nagu Daraboina, Cem Sarica
Summary: Active heating is found to be an effective method for controlling wax deposition in offshore flow-lines, with wax deposits being removed completely, partially, or not at all at different temperatures. The majority of wax can be swiftly removed within an hour, while higher removal temperatures are needed for deposits with higher wax content. In contrast to softer wax, the removal of harder wax seems to occur in two steps, with sudden removal followed by a period of no removal before sudden removal again.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Energy & Fuels
Gabriel Santos, Nagu Daraboina, Cem Sarica
Summary: This study aims to unravel the wax deposition mechanisms by investigating the effect of flow rate on the particulate deposition mechanism. It confirms the existence of the particulate deposition mechanism and observes a stronger mechanism under laminar and transition flow regimes. The study also shows that deposit thickness and growth rate are considerably greater under lower Reynolds numbers.
Article
Engineering, Mechanical
Gabriel Soto-Cortes, Eduardo Pereyra, Cem Sarica, Carlos Torres, Auzan Soedarmo
Summary: Slug flow is a common gas-liquid flow pattern in pipes, and its characteristics play a crucial role in engineering processes. This paper presents a new signal processing analysis method that utilizes statistical algorithms to accurately determine slug flow characteristics, with validation from experimental data showing good results. The proposed algorithm is recommended for slug flow characterization based on its performance against the experimental data.
FLOW MEASUREMENT AND INSTRUMENTATION
(2021)
Article
Engineering, Chemical
Nagu Daraboina, Ahmed Alhosani
Summary: This study developed a mechanistic model and conducted a sensitivity analysis to predict wax deposition in flowlines. Results showed that the deposition rate increased with increasing pipe diameter, decreasing particle size, and reducing flow rate.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Asheesh Kumar, Nagu Daraboina, Praveen Linga, Rajnish Kumar, John A. Ripmeester
Summary: Gas hydrates, such as sH and sI hydrates, have potential for gas separation applications, with sH hydrates requiring large molecules and help-gas molecules to form stable structures. Testing different compositions showed that CO2 lean mixtures form sH hydrates, while CO2-rich mixtures form sI hydrates, indicating a structure transition pattern across gas mixtures. Furthermore, it was observed that the CO2 lean mixture initially forms sI hydrate and gradually converts to the thermodynamically stable sH hydrate, providing insights into a suitable gas separation mechanism for this gas mixture.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Engineering, Chemical
Aziz Alhejaili, Ponnivalavan Babu, Nagu Daraboina
Summary: Clathrate hydrate applications have increased significantly, and one promising application is produced water purification. However, limitations such as high temperature and slow kinetics have persisted. This study investigates the effect of prevalent salts on the equilibrium of TBAC hydrates and finds that lower TBAC concentrations have better tolerance to higher contaminant concentrations. Additionally, operating at lower TBAC concentrations in high salinity water provides optimal water recovery.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Mechanics
Vinicius Kramer Scariot, Eduardo Pereyra, Cem Sarica
Summary: The present study focuses on characterizing and modeling the Taylor bubble front and tail velocities in a pipe-to-annulus transition geometry. A new non-invasive method to measure liquid distribution using computer vision was developed. The results show that the Taylor bubble front velocity is dictated by drift, while the tail velocity is related to the liquid fallback rate and bubble coalescence. The choice of characteristic dimension has an important impact on the velocity measurement.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2023)
Article
Energy & Fuels
Yingna Du, Chen Huang, Wei Jiang, Qiangwei Yan, Yongfei Li, Gang Chen
Summary: In this study, anionic surfactants modified hydrotalcite was used as a flow improver for crude oil under low-temperature conditions. The modified hydrotalcite showed a significant viscosity reduction effect on crude oil. The mechanism of the modified hydrotalcite on viscosity and pour point of crude oil was explored through characterization and analysis of the modified hydrotalcite and oil samples.
Article
Energy & Fuels
Mohammad Saeid Rostami, Mohammad Mehdi Khodaei
Summary: In this study, a hybrid structure, MIL-53(Al)@MWCNT, was synthesized by combining MIL-53(Al) particles and -COOH functionalized multi-walled carbon nanotube (MWCNT). The hybrid structure was then embedded in a polyethersulfone (PES) polymer matrix to prepare a mixed matrix membrane (MMM) for CO2/CH4 and CO2/N2 separation. The addition of MWCNTs prevented MIL-53(Al) aggregation, improved membrane mechanical properties, and enhanced gas separation efficiency.
Article
Energy & Fuels
Yunlong Li, Desheng Huang, Xiaomeng Dong, Daoyong Yang
Summary: This study develops theoretical and experimental techniques to determine the phase behavior and physical properties of DME/flue gas/water/heavy oil systems. Eight constant composition expansion (CCE) tests are conducted to obtain new experimental data. A thermodynamic model is used to accurately predict saturation pressure and swelling factors, as well as the phase boundaries of N2/heavy oil systems and DME/CO2/heavy oil systems, with high accuracy.
Article
Energy & Fuels
Morteza Afkhamipour, Ebad Seifi, Arash Esmaeili, Mohammad Shamsi, Tohid N. Borhani
Summary: Non-conventional amines are being researched worldwide to overcome the limitations of traditional amines like MEA and MDEA. Adequate process and thermodynamic models are crucial for understanding the applicability and performance of these amines in CO2 absorption, but studies on process modeling for these amines are limited. This study used rate-based modeling and Deshmukh-Mather method to model CO2 absorption by DETA solution in a packed column, validated the model with experimental data, and conducted a sensitivity analysis of mass transfer correlations. The study also compared the CO2 absorption efficiency of DETA solution with an ionic solvent [bmim]-[PF6] and highlighted the importance of finding optimum operational parameters for maximum absorption efficiency.
Article
Energy & Fuels
Arastoo Abdi, Mohamad Awarke, M. Reza Malayeri, Masoud Riazi
Summary: The utilization of smart water in EOR operations has gained attention, but more research is needed to understand the complex mechanisms involved. This study investigated the interfacial tension between smart water and crude oil, considering factors such as salt, pH, asphaltene type, and aged smart water. The results revealed that the hydration of ions in smart water plays a key role in its efficacy, with acidic and basic asphaltene acting as intrinsic surfactants. The pH also influenced the interfacial tension, and the aged smart water's interaction with crude oil depended on asphaltene type, salt, and salinity.
Article
Energy & Fuels
Dongao Zhu, Kun Zhu, Lixian Xu, Haiyan Huang, Jing He, Wenshuai Zhu, Huaming Li, Wei Jiang
Summary: In this study, cobalt-based metal-organic frameworks (Co-based MOFs) were used as supports and co-catalysts to confine the NHPI catalyst, solving the leaching issue. The NHPI@Co-MOF with carboxyl groups exhibited stronger acidity and facilitated the generation of active oxygen radicals O2•, resulting in enhanced catalytic activity. This research provides valuable insights into the selection of suitable organic linkers and broadens the research horizon of MOF hybrids in efficient oxidative desulfurization (ODS) applications.
Article
Energy & Fuels
Edwin G. Hoyos, Gloria Amo-Duodu, U. Gulsum Kiral, Laura Vargas-Estrada, Raquel Lebrero, Rail Munoz
Summary: This study investigated the impact of carbon-coated zero-valent nanoparticle concentration on photosynthetic biogas upgrading. The addition of nanoparticles significantly increased microalgae productivity and enhanced nitrogen and phosphorus assimilation. The presence of nanoparticles also improved the quality of biomethane produced.
Article
Energy & Fuels
Yao Xiao, Asma Leghari, Linfeng Liu, Fangchao Yu, Ming Gao, Lu Ding, Yu Yang, Xueli Chen, Xiaoyu Yan, Fuchen Wang
Summary: Iron is added as a flocculant in wastewater treatment and the hydrothermal carbonization (HTC) of sludge produces wastewater containing Fe. This study investigates the effect of aqueous phase (AP) recycling on hydrochar properties, iron evolution and environmental assessment during HTC of sludge. The results show that AP recycling process improves the dewatering performance of hydrochar and facilitates the recovery of Fe from the liquid phase.
Article
Energy & Fuels
He Liang, Tao Wang, Zhenmin Luo, Jianliang Yu, Weizhai Yi, Fangming Cheng, Jingyu Zhao, Xingqing Yan, Jun Deng, Jihao Shi
Summary: This study investigated the influence of inhibitors (carbon dioxide, nitrogen, and heptafluoropropane) on the lower flammability limit of hydrogen and determined the critical inhibitory concentration needed for complete suppression. The impact of inhibitors on explosive characteristics was evaluated, and the inhibitory mechanism was analyzed with chemical kinetics. The results showed that with the increase of inhibitor quantity, the lower flammability limit of hydrogen also increased. The research findings can contribute to the safe utilization of hydrogen energy.
Article
Energy & Fuels
Zonghui Liu, Zhongze Zhang, Yali Zhou, Ziling Wang, Mingyang Du, Zhe Wen, Bing Yan, Qingxiang Ma, Na Liu, Bing Xue
Summary: In this study, high-performance solid catalysts based on phosphotungstic acid (HPW) supported on Zr-SBA-15 were synthesized and evaluated for the one-pot conversion of furfural (FUR) to γ-valerolactone (GVL). The catalysts were characterized using various techniques, and the ratio of HPW and Zr was found to significantly affect the selectivity of GVL. The HPW/Zr-SBA-15 (2-4-15) catalyst exhibited the highest GVL yield (83%) under optimized reaction conditions, and it was determined that a balance between Bronsted acid sites (BAS) and Lewis acid sites (LAS) was crucial for achieving higher catalytic performance. The reaction parameters and catalyst stability were also investigated.
Article
Energy & Fuels
Michael Stoehr, Stephan Ruoff, Bastian Rauch, Wolfgang Meier, Patrick Le Clercq
Summary: As part of the global energy transition, an experimental study was conducted to understand the effects of different fuel properties on droplet vaporization for various conventional and alternative fuels. The study utilized a flow channel to measure the evolution of droplet diameters over time and distance. The results revealed the temperature-dependent effects of physical properties, such as boiling point, liquid density, and enthalpy of vaporization, and showed the complex interactions of preferential vaporization and temperature-dependent influences of physical properties for multi-component fuels.
Article
Energy & Fuels
Yuan Zhuang, Ruikang Wu, Xinyan Wang, Rui Zhai, Changyong Gao
Summary: Through experimental validation and optimization of the chemical kinetic model, it was found that methanol can accelerate the oxidation reaction of ammonia, and methanol can be rapidly oxidized at high concentration. HO2 was found to generate a significant amount of OH radicals, facilitating the oxidation of methanol and ammonia. Rating: 7.5/10.
Article
Energy & Fuels
Radwan M. EL-Zohairy, Ahmed S. Attia, A. S. Huzayyin, Ahmed I. EL-Seesy
Summary: This paper presents a lab-scale experimental study on the impact of diethyl ether (DEE) as an additive to waste cooking oil biodiesel with Jet A-1 on combustion and emission features of a swirl-stabilized premixed flame. The addition of DEE to biodiesel significantly affects the flame temperature distribution and emissions. The W20D20 blend of DEE, biodiesel, and Jet A-1 shows similar flame temperature distribution to Jet A-1 and significantly reduces UHC, CO, and NOx emissions compared to Jet A-1.
Article
Energy & Fuels
Jiang Bian, Ziyuan Zhao, Yang Liu, Ran Cheng, Xuerui Zang, Xuewen Cao
Summary: This study presents a novel method for ammonia separation using supersonic flow and develops a mathematical model to investigate the condensation phenomenon. The results demonstrate that the L-P nucleation model accurately characterizes the nucleation process of ammonia at low temperatures. Numerical simulations also show that increasing pressure and concentration can enhance ammonia condensation efficiency.
Article
Energy & Fuels
Shiyuan Pan, Xiaodan Shi, Beibei Dong, Jan Skvaril, Haoran Zhang, Yongtu Liang, Hailong Li
Summary: Integrating CO2 capture with biomass-fired combined heat and power (bio-CHP) plants is a promising method for achieving negative emissions. This study develops a reliable data-driven model based on the Transformer architecture to predict the flowrate and CO2 concentration of flue gas in real time. The model validation shows high prediction accuracy, and the potential impact of meteorological parameters on model accuracy is assessed. The results demonstrate that the Transformer model outperforms other models and using near-infrared spectral data as input features improves the prediction accuracy.