Article
Multidisciplinary Sciences
Hua Xia, Hongbing Ding, Hongbing Ding, Hongbing Ding, Hongbing Ding
Summary: Increasing injection pressure can decrease nozzle flow performance, increase spray tip penetration, but has minimal effect on spray cone angle.
Article
Engineering, Mechanical
Jianping Wang, Qiankun Zhang, Jin Xia, Liang Yu, Dezhi Zhou, Yong Qian, Xingcai Lu
Summary: This study investigates the spray characteristics of aviation kerosene (RP-3) under sub/trans/supercritical conditions. The effects of nozzle diameter and injection pressure on the spray characteristics are studied. The results show that the spray characteristics of kerosene differ under different critical conditions. Nozzle diameter has a stronger effect on kerosene spray compared to diesel spray, while injection pressure has a negligible effect on spray macroscopic characteristics.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE ENGINEERING
(2023)
Article
Thermodynamics
Quangkhai Pham, Mengzhao Chang, Ankur Kalwar, Avinash Kumar Agarwal, Sungwook Park, Byungchul Choi, Suhan Park
Summary: The macroscopic spray characteristics and internal structure of a highly expanded compressed natural gas (Methane; CH4) spray were studied experimentally and numerically. The spraying characteristics and shockwave structures were analyzed, showing that increasing the injection pressure did not improve the spray tip penetration but increased the choking phenomenon. This phenomenon is a key factor that affects the shockwave structure and leads to an increase in the spray volume and area.
Article
Multidisciplinary Sciences
Chengting Liu, Liang He
Summary: A new supersonic atomization drainage gas recovery technology was developed to improve recovery rate, with established models and neural networks for predicting droplet size accurately. Experimental results demonstrate high accuracy and successful application in increasing natural gas recovery efficiency.
SCIENTIFIC REPORTS
(2022)
Article
Agronomy
Benny De Cauwer, Ilke De Meuter, Sander De Ryck, Donald Dekeyser, Ingrid Zwertvaegher, David Nuyttens
Summary: In many EU countries, there are increasingly strict requirements for spray applications to use nozzles with reduced spray drift. However, farmers are concerned that the use of drift-reducing nozzles may affect the effectiveness of contact herbicides. This study investigated the effects of different drift-reducing nozzles on spray coverage, droplet characteristics, and the efficiency of contact herbicides against certain weed species. The results showed that most drift-reducing nozzles performed equally well as standard nozzles, but air-induction nozzles were not suitable for effective application on certain weed species at specific growth stages. The study also found that droplet size characteristics were not a good indicator of herbicide efficiency.
Article
Engineering, Mechanical
Huijun Kim, Seungho Yang, Sungwook Park
Summary: This study investigates the phenomenon of spray collapse in a non-flash boiling condition. Through a spray visualization system, the effects of injection pressure, ambient pressure, fuel temperature, and nozzle hole pattern on spray collapse were observed. It was found that the narrower hole pattern promoted spray collapse, and higher ambient pressure decreased the time to overtaking.
INTERNATIONAL JOURNAL OF AUTOMOTIVE TECHNOLOGY
(2022)
Article
Energy & Fuels
Huijun Kim, Sungwook Park, Suhan Park
Summary: The effect of in-nozzle flow and low-pressure zone near the nozzle exit on the spray targeting of a multi-hole gasoline direct injection injector was investigated using numerical simulation. The analysis showed that cavitation occurred at a sharp corner with high flow velocity, and low-pressure liquid rebounded at the hole wall, causing the flow to bend towards cavitation. Increasing injection pressure reduced the minimum pressure in the low-pressure zone, while increasing ambient pressure caused the low-pressure zone to form closer to the hole exit. The low-pressure zone had a greater impact on plume bending than in-nozzle flow, especially with higher ambient pressure.
Article
Thermodynamics
Yuming Lu, Hongzi Fei, Hao Yang, Yiyong Huang, Hai Zhang
Summary: The selection of organic cooling mediums in injection cooling significantly affects the cooling effect, while most research focuses on water. The evaporation of organic cooling mediums such as ethanol can assist combustion, but research on their cooling effect is relatively lacking. Tests on organic working fluids show that the evaporation and cooling effect of ethanol solutions improve with increased concentration. Not all organic cooling mediums bring good temperature drop and evaporation effects. Higher airflow temperature enhances the cooling effect of working mediums, while the liquid-gas ratio has almost no influence on temperature drop.
APPLIED THERMAL ENGINEERING
(2022)
Article
Materials Science, Coatings & Films
Gidla Vinay, Naveen Manhar Chavan, S. Kumar, A. Jyothirmayi, Bolla Reddy Bodapati
Summary: Cold sprayed zinc coatings were deposited on mild steel substrate and their microstructure and properties were evaluated. The results showed that cold sprayed coatings performed better than coatings from other techniques, primarily due to improved inter-splat bonding. Finite element analysis also supported these findings.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Engineering, Chemical
Kirsten Wessels, Diane Rip, Pieter Gouws
Summary: This study investigated the effects of different spray parameters on phage survival. The results showed that bottled water reduced phage concentration more than distilled water. Additionally, unchlorinated water and a pressure of 3 Bar yielded the highest output phage concentration.
Article
Engineering, Multidisciplinary
Zhang ZhiWei, Hu DingHua, Li Qiang, Liu Chao, Zhou Fan
Summary: The study reveals that increasing superheat results in finer droplets and thinner liquid film, improving heat transfer efficiency. Expanding atomization angle benefits in reducing spray distance in flash spray cooling. The choice of nozzle is crucial for the cooling performance in flash spray, depending on the superheat level.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2021)
Article
Engineering, Mechanical
Jianping Wang, Qiankun Zhang, Yaoyuan Zhang, Liang Yu, Dezhi Zhou, Xingcai Lu, Yong Qian
Summary: This study aims to explore the characteristics of spontaneous combustion and engine performance of kerosene in traditional compression ignition mode, providing a reference for optimizing kerosene compression ignition engines and advanced combustion mode. Ignition visualization tests of kerosene under marine and vehicle engine conditions were conducted, comparing the characteristics with diesel under 0.3 mm nozzle diameter. Then, the engine performance of both fuels under medium load and ultra-high injection pressures was compared. The results show that kerosene and diesel have similar ignition and combustion characteristics, indicating the universality of kerosene in diesel engine application. Kerosene has a longer ignition delay time, resulting in delayed combustion and heat release. Compared to diesel, kerosene has lower CO, particulate emissions, and indicated thermal efficiency, while higher HC and NOx emissions. The emission characteristics of kerosene RP-3 differ from previous studies, especially under ultra-high injection pressure. The combustion process and engine emissions of kerosene can be optimized with advanced combustion models and strategies.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE ENGINEERING
(2023)
Article
Energy & Fuels
Yuxin Zhang, Ziman Wang, Chia-fon Lee, Feng Li, Han Wu
Summary: Diesel engines are subject to strict regulations on reducing emissions, and ducted fuel injection (DFI) is a new method to effectively reduce soot emissions. DFI increases spray velocity by decreasing total entrainment of ambient gas and restricting radial development of the spray. Additionally, the formation of a mushroom-shaped head in the spray nozzle is attributed to pressure differences inside and outside of the duct.
Article
Thermodynamics
Minhoo Choi, Khawar Mohiuddin, Namho Kim, Sungwook Park
Summary: This study focused on the effects of EGR rate, injection pressure, injection timing, and nozzle hole diameter on nitrogen oxide and particulate matter emissions in a diesel engine. The results showed that EGR rate and injection pressure have significant impacts on PM density and flame temperature, while injection timing affects the PM oxidation rate. Furthermore, nozzle hole diameter influences fuel atomization and optical results of NOx and PM emissions.
APPLIED THERMAL ENGINEERING
(2021)
Article
Engineering, Multidisciplinary
Jalal Bahreh Bar, Mohammad Gholami Parashkoohi, Davood Mohammad Zamani, Hasan Ghafori
Summary: The study investigates the impact of nozzle diameter size and pressure on the angle and flow rate of the spray nozzle in greenhouse cultivation. It finds that the pressure directly affects the spray angle, with higher pressure resulting in a larger spray angle. Additionally, the study suggests that a pressure of 40 bar is optimal for the new nozzle design, increasing the uniformity of spraying. Overall, controlling humidity and temperature through misting systems and optimized nozzle design can enhance plant growth speed and uniformity, as well as improve the quality and quantity of plant production in greenhouse cultivation.
RESULTS IN ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Zhonghe Huang, Jianping Tan, Chuliang Liu, Xiong Lu
Summary: The study establishes a mathematical model for the helicopter tail rotor driveline, analyzing the effects of multiple vibration suppression, static and dynamic misalignment to demonstrate the accuracy and characteristics of the model.
Article
Thermodynamics
Zhonghe Huang, Jianping Tan, Xiong Lu
Summary: This study investigates the stability and phase difference of a shaft with a dry friction damper, incorporating effects of viscous internal damping and gyroscopic moment. Analytical and numerical simulations based on a helicopter tailrotor driveline are utilized to present the effects of various system parameters on phase difference and stability, with experimental validation conducted to confirm the theoretical formulas and simulation analysis. Results show that rub impact delays phase difference changes, viscous internal damping enhances stability, and gyroscopic moment influences the increase in phase difference.
ADVANCES IN MECHANICAL ENGINEERING
(2021)
Article
Engineering, Electrical & Electronic
Chuliang Liu, Jianping Tan, Zhonghe Huang
Summary: The vibration signals collected by sensors often contain complex frequency components, which pose challenges to bearing condition monitoring and fault diagnosis. This paper proposes an adaptive optimal mode extraction method based on the variational mode extraction (VME) method, which is capable of extracting weak fault features.
Article
Thermodynamics
Pengcheng Zhao, Jingang Wang, Liming Sun, Yun Li, Haiting Xia, Wei He
Summary: The production of green hydrogen through water electrolysis is crucial for renewable energy utilization and decarbonization. This research explores the optimal electrode configuration and system design of compactly-assembled industrial electrolyzer. The findings provide valuable insights for industrial application of water electrolysis equipment.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
V. Baiju, P. Abhishek, S. Harikrishnan
Summary: Thermally driven adsorption desalination systems (ADS) have gained attention as an eco-friendly solution for water scarcity. However, they face challenges related to low water productivity and scalability. To overcome these challenges, integrating ADS with other desalination technologies can create a small-scale hybrid system. This study proposes integrating ADS with a Thermo Electric Dehumidification (TED) unit to enhance its performance.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
C. X. He, Y. H. Liu, X. Y. Huang, S. B. Wan, Q. Chen, J. Sun, T. S. Zhao
Summary: A decentralized centroid multi-path RC network model is constructed to improve the temperature prediction accuracy compared to traditional RC models. By incorporating multiple heat flow paths and decentralizing thermal capacity, a more accurate prediction is achieved.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Chaoying Li, Meng Wang, Nana Li, Di Gu, Chao Yan, Dandan Yuan, Hong Jiang, Baohui Wang, Xirui Wang
Summary: There is an urgent need to shift away from heavy dependence on fossil fuels and embrace renewable energy sources, particularly in the energy-intensive oil refining process. This study presents an innovative concept called the Solar Oil Refinery, which applies solar energy in oil refining. A solar multi-energies-driven hybrid chemical oil refining system that utilizes solar pyrolysis and electrolysis has been developed, significantly improving solar utilization efficiency, cracking rate, and hydrogen yield.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Chao Ma, Guanghui Wang, Dingbiao Wang, Xu Peng, Yushen Yang, Xinxin Liu, Chongrui Yang, Jiaheng Chen
Summary: This study proposes a bio-inspired fish-tail wind rotor to improve the wind power efficiency of the traditional Savonius rotor. Through transient simulations and orthogonal experiments, the key factors affecting the performance are identified. A response surface model is constructed to optimize the power coefficient, resulting in an improvement of 9.4% and 6.6% compared to the Savonius rotor.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Sina Bahmanziari, Abbas-Ali Zamani
Summary: This paper proposes a new framework for improving electrical energy harvesting from piezoelectric smart tiles through a combination of magnetic plucking, mechanical impact, and mechanical vibration force mechanisms. Experimental results demonstrate a significant increase in energy yield and average energy harvesting time compared to other mechanisms.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Nanjiang Dong, Tao Zhang, Rui Wang
Summary: This study establishes a multiobjective mixed-variable configuration optimization model for a comprehensive combined cooling, heating, and power energy system, and proposes an efficient generating operator to optimize this model. The experimental results show that the proposed algorithm performs better than other state-of-the-art algorithms.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Ahmed E. Mansy, Eman A. El Desouky, Tarek H. Taha, M. A. Abu-Saied, Hamada El-Gendi, Ranya A. Amer, Zhen-Yu Tian
Summary: This study aims to convert office paper waste into bioethanol through a sustainable pathway. The results show that physiochemical and enzymatic hydrolysis of the waste can yield a high glucose concentration. The optimal conditions were determined using the Box-Behnken design, and a blended membrane was used for ethanol purification.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Sven Klute, Marcus Budt, Mathias van Beek, Christian Doetsch
Summary: Heat pumps are crucial for decarbonizing heat supply, and steam generating heat pumps have the potential to decarbonize the industrial sector. This paper presents the current state, technical and economic data, and modeling principles of steam generating heat pumps.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Le Zhang, To-Hung Tsui, Yen Wah Tong, Pruk Aggarangsi, Ronghou Liu
Summary: This study investigates the effectiveness of a current-carrying-coil-based magnetic field in promoting anaerobic digestion of chicken manure. The results show that the applied magnetic field increases methane yield, decreases carbon dioxide production, and reduces the concentration of ammonia nitrogen. Microbial community analysis reveals the enrichment of certain methanogenic genera and enhanced metabolic pathways. Pilot-scale experiments confirm the technical effectiveness of the magnetic field assistance in enhancing anaerobic digestion of chicken manure.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Bo Chen, Ruiqing Ma, Yang Zhou, Rui Ma, Wentao Jiang, Fan Yang
Summary: This paper presents an advanced energy management strategy for fuel cell hybrid electric heavy-duty vehicles, focusing on speed planning and energy allocation. By utilizing predictive co-optimization control, this strategy ensures safe inter-vehicle distance and minimizes energy demand. Simulation results demonstrate the effectiveness of the proposed method in reducing fuel cell degradation cost and overall operation cost.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Fabio Fatigati, Roberto Cipollone
Summary: Organic Rankine Cycle-based microcogeneration systems that use solar sources to generate electricity and hot water can help reduce CO2 emissions in residential energy-intensive sectors. The adoption of a recuperative heat exchanger in these systems improves efficiency, reduces thermal power requirements, and saves on electricity costs.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Lipeng He, Renwen Liu, Xuejin Liu, Xiaotian Zheng, Limin Zhang, Jieqiong Lin
Summary: This research proposes a piezoelectric-electromagnetic hybrid energy harvester (PEHEH) for low-frequency wave motion and self-sensing wave environment monitoring. The PEHEH shows promising power output and the ability to self-power and self-sense the wave environment.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Shangling Chu, Yang Liu, Zipeng Xu, Heng Zhang, Haiping Chen, Dan Gao
Summary: This paper studies a distributed energy system integrated with solar and natural gas, analyzes the impact of different parameters on its energy utilization and emissions reduction, and obtains the optimal solution through an optimization algorithm. The results show that compared to traditional separation production systems, this integrated system achieves higher energy utilization and greater reduction in carbon emissions.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Qingpu Li, Yaqi Ding, Guangming Chen, Yongmei Xuan, Neng Gao, Nian Li, Xinyue Hao
Summary: This paper proposes and studies a piston-type thermally-driven pump with a structure similar to a linear compressor, aiming to eliminate the high-quality energy consumption of existing pumps and replace mechanical pumps. The coupling mechanism of working fluid flow and element dimension is analyzed based on force analysis, and experimental data analysis is used to determine the pump operation stroke. Theoretical simulation is conducted to analyze the correlation mechanism of the piston assembly. The research shows that the thermally-driven pump can greatly reduce power consumption and has potential for industrial applications.
ENERGY CONVERSION AND MANAGEMENT
(2024)