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Article
Engineering, Aerospace
Jian Zhang et al.
Summary: This study investigates the effect of endwall secondary flow on swirling film cooling using numerical simulations. The results show that the complex vortex structures near the endwall have a significant influence on the film cooling effectiveness, with strong transverse cross flow being the main reason. Moreover, the compound angle of the film hole and the blowing ratio also affect the film cooling performance.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART G-JOURNAL OF AEROSPACE ENGINEERING
(2023)
Article
Thermodynamics
Gao Shu et al.
Summary: Solar energy provides an alternative solution to building energy utilization, addressing the issues of energy conservation and emission reduction. To overcome the fluctuation in energy supply, a latent heat phase change module is designed. Experimental studies on the effects of heating and cooling temperatures on thermal cycles provide guidance for the design of passive building energy utilization.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Xinyu Huang et al.
Summary: The melting performance of a rotating triplex-tube latent heat thermal energy storage unit is optimized using the Taguchi design and response surface method. The effects of fin distribution, fin number, and fin material on the melting performance are quantitatively revealed. The optimal design reduces the total melting time and increases the average heat absorption rate compared to the original structure.
Article
Thermodynamics
Xinyu Huang et al.
Summary: This paper studies the melting performance of a triplex-tube latent heat thermal energy storage unit (T-LHTESU) and applies the rotation mechanism to improve its storage efficiency. The numerical model is verified by experimental data. The results show that the rotation mechanism significantly improves the heat storage efficiency and reduces the melting time of the T-LHTESU.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Zhentao Xin et al.
Summary: Spray cooling technology can effectively reduce the exhaust pipe drag of engineering vehicles and improve engine power performance, especially when the spray flow rate is in the range of 12-24 ml/s. With the synergistic effect of frictional resistance reduction and dynamic pressure reduction, the drag downstream of the spray location is significantly reduced, achieving a drag reduction rate as high as 90%.
APPLIED THERMAL ENGINEERING
(2023)
Article
Computer Science, Interdisciplinary Applications
Mehran Bagheri et al.
Summary: In this study, a three-dimensional two-phase LBMVOF model based on the VOF method was developed and used to simulate the breakup of a water jet in the air. The model accurately predicted different water jet regimes and the transition from periodic dripping to jetting. When the dripping to jetting transition occurred, the length of breakup and the frequency of droplet production increased sharply, while the volume of produced droplets decreased.
COMPUTERS & FLUIDS
(2023)
Article
Mechanics
Sepehr Mousavi et al.
Summary: Jet breakup and droplet formation in different regimes are studied using three Newtonian and three shear-thinning non-Newtonian fluids. Results show that in periodic dripping and dripping faucet regimes, viscosity and non-Newtonian rheology of shear-thinning fluids do not affect jet breakup properties. However, in the jetting regime, increasing viscosity significantly increases jet breakup length and leads to a lower regime transition at lower Weber numbers.
JOURNAL OF NON-NEWTONIAN FLUID MECHANICS
(2023)
Article
Energy & Fuels
Yuanji Li et al.
Summary: Solid-liquid phase change heat storage is an important method for solving the mismatch of waste heat generation and usage, contributing to decarbonization and energy conservation. This study designed different shapes of trapezoidal tanks with varying upper and lower radius proportions to investigate the heat storage performance. Various indexes were proposed to evaluate the properties of latent heat thermal energy storage, and a multilayer perceptron network model was built to predict the heat storage fraction and total heat storage.
Article
Thermodynamics
Mi Zwe Mon Phyo et al.
Summary: This study investigates the combustion and exhaust behaviors of a diesel engine with various diesel fuels and a non-catalytic partial flow through a diesel particulate filter. The study characterizes the particulate matter using microscopy and spectroscopy techniques. The results show that the non-catalytic partial flow through a diesel particulate filter can effectively reduce the particle emissions from the diesel engine.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Akshay Jain et al.
Summary: Power production through combustion of fuels is crucial for a nation's progress, and biodiesel is a potential replacement for fossil fuel. In this study, nano blended biodiesel composed of titanium dioxide nanoparticles and Eichhornia Crassipes biodiesel was used to improve efficiency and reduce emissions in a diesel engine. The findings showed that adding nano particles at high fuel injection pressure significantly improved brake thermal efficiency and reduced emissions. The highest improvement of brake thermal efficiency (1.01%) was achieved with a nano blended biodiesel composition of 150 ppm titanium dioxide and a fuel injection pressure of 220 bar under full loading condition. Hydrocarbon and carbon monoxide emissions were lowest at 60% load for the same fuel injection pressure and nano blended biodiesel composition.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Xinyu Gao et al.
Summary: This study designs a thermal energy storage (TES) unit with different horizontal metal foam filling ratios (60%-100%) and conducts simulations of thermal characteristics. The TES unit with a filling ratio of 90% shows the shortest complete melting time and requires the least number of TES units for the solar heating system (SHS) to achieve a payback period of three heating seasons.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Review
Thermodynamics
Yipeng Yao et al.
Summary: This paper reviews the effects of hydrocarbon vapor, water vapor, and acid vapor condensation on fouling and thermal performance of EGR cooler from 1998 to 2023. Three pathways and five effects have been identified to play a key role in the composition, mass, thickness, density, morphology, and thermal resistance of fouling layer. The involvement level and contribution degree of vapor condensation under different conditions can be further explored to understand the logical relationship between exhaust vapor condensation and fouling and thermal performance.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Engineering, Aerospace
Tingting Jing et al.
Summary: With the increasing altitude and speed of hypersonic vehicles, film cooling with hydrocarbon fuel is widely used to decrease the wall heat flux. The study found that entrainment process between cooling films with different blowing ratios and injection angles influences the film cooling efficiency, and a proper combination of these factors can improve efficiency and decrease the flow rate of the cooling film.
Article
Engineering, Aerospace
Qingzong Xu et al.
Summary: The aerothermal performance of interrupted slot and film holes was investigated numerically, showing that the interrupted slot performs better and the step formed along with it affects film cooling characteristics. Density ratio has a smaller effect on total pressure loss, and positioning film holes away from the upstream step delivers optimal cooling efficiency.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART G-JOURNAL OF AEROSPACE ENGINEERING
(2022)
Article
Engineering, Aerospace
Rui Zhu et al.
Summary: This paper presents the results of a numerical study on the effects of swirling flow in coolant jets on film cooling performance. The study proposes and analyzes combined-hole designs with swirling coolant flow, and compares the film cooling effectiveness values for cases with different blowing ratios. The detailed flow structures and underlying mechanisms are discussed. The results indicate that jet swirl improves film cooling effectiveness at high blowing ratios, and swirl strength significantly influences film cooling performance. Combined-hole designs further enhance film cooling performance through coolant flow mixing and vortex interaction.
CHINESE JOURNAL OF AERONAUTICS
(2022)
Article
Thermodynamics
A. G. M. B. Mustayen et al.
Summary: The study explores the use of diesel engines running on biodiesel blends for power generation in remote areas and islands. Various techniques for increasing efficiency, power, and torque of diesel engines are discussed, along with the impact of biodiesels on performance and emissions in diesel engines. The study recommends hybrid power generation and low load conditions for maximum renewable energy penetration in diesel fuel systems.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Review
Chemistry, Applied
Sheikh Muhammad Farhan et al.
Summary: Vehicle emissions play a significant role in environmental pollution, particularly in particulate emissions. Research on post-injection strategies in diesel engines shows that it can improve combustion efficiency, reduce emissions of particulate matter, hydrocarbons, and carbon monoxide.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Thermodynamics
Runzhou Liu et al.
Summary: This paper experimentally investigated the effects of coolant flow rate, location of film holes, tip clearance height, and density ratio on blade tip film cooling effectiveness. Numerical simulation was used to analyze the flow characteristic. The results indicated that the cooling effectiveness gradually increased as the blowing ratio increased. The squealer tip with an inclined pressure side rim exhibited better film cooling effectiveness under the design conditions.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Thermodynamics
Megavath Vijay Kumar et al.
Summary: With the increasing use of diesel engines, the emissions released have also increased. Governments worldwide have introduced regulations to reduce exhaust emissions, leading to the development of various emission reduction systems by automobile manufacturers. The aim of this research is to reduce diesel engine exhaust emissions by using systems such as DPF, EGR, and SCR. Testing different combinations of these systems, it was found that the combination of DPF + SCR with 10% EGR rate yielded appreciable results.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Phyo Wai et al.
Summary: This study investigates the impact of oxygenated biofuels on diesel engine combustion, thermal efficiency, and emission. The findings demonstrate that blending ethanol and biodiesel with diesel leads to higher premixed combustion pressure and net heat release rate. Additionally, the inclusion of ethanol and biodiesel reduces particle emissions by over 50%.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Rui Hou et al.
Summary: The study investigates the impacts of the inlet swirl core and the use of trenched holes to enhance the cooling performance of a leading-edge model, showing that trenched cases provide better cooling performance under different conditions.
HEAT TRANSFER ENGINEERING
(2021)
Article
Thermodynamics
Wei Guan et al.
Summary: Legislations on heavy-duty diesel engines emissions are becoming more stringent, leading to the exploration of alternative combustion modes such as diesel-methanol dual-fuel. However, high combustion pressure rise rate and peak in-cylinder pressure limit the potential of diesel-methanol dual-fuel operation at high engine loads.
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2021)
Article
Thermodynamics
M. Vergel-Ortega et al.
Summary: This study investigates the use of ethanol as an additive in biodiesel blends derived from palm oil and sunflower oil residues, finding that ethanol incorporation can improve thermal efficiency and reduce emissions levels in diesel engines. Integrating biodiesel and ethanol emerges as a promising alternative for reliable and sustainable operation.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Review
Chemistry, Physical
Weisan Hua et al.
Summary: This paper reviews the theoretical basis and application progress of phase change materials (PCMs) in chip thermal management, including different types of PCMs, non-embedded cooling solutions, and research methods of embedded cooling.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Engineering, Aerospace
Zhuang Wu et al.
Summary: The study explores the heat transfer performance of showerhead film cooling on the vane leading edge under swirling outflow from lean burn combustors. The newly designed asymmetrical counter-inclined film cooling showed improved cooling effectiveness and heat transfer augmentation compared to the traditional symmetrical design. The results confirmed the adaptability of the film design principle under swirling inflow, with the new design effectively weakening the deflection effect and providing a more uniform film distribution.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART G-JOURNAL OF AEROSPACE ENGINEERING
(2021)
Article
Thermodynamics
Jiayu Miao et al.
Summary: Evaporative pre-cooling systems can enhance the cooling performance of NDDCTs during high temperature period, but may have limited effect or even deteriorate the performance in non-high temperature period. Nozzle spray pre-cooling system is recommended for year-round performance improvement, with intermittent operation or certain-time period operation as water-saving options.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Energy & Fuels
Hamza Fawzy et al.
Review
Thermodynamics
Simone Lion et al.
ENERGY CONVERSION AND MANAGEMENT
(2020)
Article
Engineering, Chemical
Mohammed Al-Hemyari et al.
Review
Energy & Fuels
Peiyong Ni et al.
Article
Engineering, Aerospace
Manuel Wilhelm et al.
INTERNATIONAL JOURNAL OF TURBOMACHINERY PROPULSION AND POWER
(2019)
Article
Thermodynamics
Taiping Wang et al.
APPLIED THERMAL ENGINEERING
(2018)
Article
Thermodynamics
Gautam Edara et al.
CASE STUDIES IN THERMAL ENGINEERING
(2018)
Article
Thermodynamics
Yuting Jiang et al.
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
(2016)
Article
Engineering, Mechanical
Wenshuo Yang et al.
JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME
(2016)
Article
Thermodynamics
M. H. Sadafi et al.
ENERGY CONVERSION AND MANAGEMENT
(2015)
Article
Thermodynamics
M Gritsch et al.
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
(2000)
