Article
Environmental Sciences
Jatoth Ramachander, Santhosh Kumar Gugulothu, Gadepalli Ravikiran Sastry, Burra Bhsker
Summary: This study focused on maximizing the usage of mahua oil biodiesel in a diesel engine with a common rail direct injection system, analyzing the impact of fuel injection pressure on engine characteristics. By adjusting the injection pressure, ternary fuel can be better utilized, resulting in improved combustion characteristics and higher brake thermal efficiency.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Energy & Fuels
Haseeb Yaqoob, Yew Heng Teoh, Muhammad Ahmad Jamil, Farooq Sher
Summary: Waste to fuel conversion is important due to fuel demand, waste disposal issues, and environmental and economic impact. This study examines the energy, exergy, thermoeconomic, and sustainability aspects of tire pyrolysis oil (TPO)-diesel blends. The results show that DP10 (Diesel 90%-TPO 10%) performs the best in terms of energy and exergy efficiency, as well as sustainability.
Article
Chemistry, Physical
S. Sathishkumar, M. Mohamed Ibrahim
Summary: This research investigated the impact of four different diesel injection schedules in low and medium load conditions on the performance of engines operating in hydrogen-diesel dual fuel mode. It was found that the double pulse phase-2 injection schedule increased thermal efficiency while also increasing NO emissions, whereas the multi-pulse injection schedule significantly reduced NO emissions but led to a slight increase in smoke emissions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Green & Sustainable Science & Technology
Nadeem Abdul Hameed, Caneon Kurien, Ramesh Kaipakam Jaychandra, Mayank Mittal
Summary: The use of biomethane in diesel engines can improve performance and reduce emissions, but combustion noise is still a concern. This study experimentally investigated the combustion noise of a biomethane augmented dual fuel diesel engine and found that increasing the methane share can effectively reduce noise levels.
ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY
(2022)
Article
Agricultural Engineering
Paras Gupta, Upendra Rajak, Tikendra Nath Verma, Manoj Arya, Thokchom Subhaschandra Singh
Summary: This paper investigates the viability of microalgae as a replacement feedstock for compression ignition engines. The characteristics of various diesel fuel alternatives and their blends with diesel were studied. The findings show that the use of MAME20D80 and KA20D80 in diesel engines is viable.
INDUSTRIAL CROPS AND PRODUCTS
(2023)
Article
Energy & Fuels
Upendra Rajak, Manoj Panchal, Prerana Nashine, Tikendra Nath Verma, Rohit Kumar, Arivalagan Pugazhendhi
Summary: The goal of this study is to find a way to run a diesel engine entirely on spirulina microalgae (SMA) and base fuel (BF) in a dual fuel mode. The effects of keeping the injection settings and compression ratio fixed on the performance and burning of the diesel engine running on SMA-BF are examined. The results show that the SMA20BF80 blend has a slightly lower efficiency and higher fuel consumption compared to BF, but it emits less NOx and smoke at high load.
Article
Energy & Fuels
Heng Wu, Fangxi Xie, Yongqiang Han, Qiaosheng Zhang, Yinlong Li
Summary: The cetane number significantly affects the combustion and emissions of diesel engines. As the cetane number increases, the peak in-cylinder pressure and heat release rate decrease, while the coupling injection pressure, NOx emissions, and the number concentration and total mass of particulate matter increase.
Article
Energy & Fuels
Q. Wan, G. Zhai, C. Wang, M. J. Evans, P. R. Medwell, A. C. Y. Yuen, S. Kook, G. H. Yeoh, Q. N. Chan
Summary: This study investigates the effects of ambient and injection parameters on the combustion characteristics of hydrogen-methane jet in direct-injection compression-ignition conditions. The results show that the ignition delay decreases with increasing ambient temperature and the lower ambient oxygen cases display a more voluminous ignition sequence. The jet flame recesses upstream and becomes increasingly lifted with lower ambient temperature and oxygen conditions, affecting the flame evolution and heat release profile.
Article
Energy & Fuels
Y. H. Teoh, H. Yaqoob, H. G. How, T. D. Le, H. T. Nguyen
Summary: This study compares the combustion, performance, and emission characteristics of tire pyrolysis oil, biodiesel, and diesel blended fuel in a multi-cylinder high-pressure common-rail diesel engine. The results show that the P10 fuel outperforms B10 and diesel fuel in terms of torque, brake power, brake thermal efficiency, and emissions reduction. Therefore, P10 is a suitable alternative fuel for multi-cylinder diesel engines without any modifications.
Article
Energy & Fuels
Lei Zhou, Kun Yang, Zhang Ping, Tao Nie, Xiong Biao, Lin Huang
Summary: The combustion process of diesel engines is controlled by fuel injection characteristics, and a more flexible injection strategy is the development direction for high pressure common-rail systems. This study investigated the effect of different post-injection parameters on diesel engine performance using an experiment bench. The results showed that selecting appropriate post-injection fuel quantity and interval angle can reduce both NOx and soot emissions simultaneously.
Article
Energy & Fuels
Xiyu Yang, Tanqing Zhou, Xiaoyan Wang, Jingshan Wang, Quan Dong
Summary: This paper presents an innovative perception method for gas injection characteristics in high-pressure natural gas direct injection engines, using short-time Fourier transform and neural network modeling for online perception of the gas injection process.
Article
Thermodynamics
J. Ramachander, S. K. Gugulothu, M. Siva Surya
Summary: The ternary fuel increases NOx emissions and specific fuel consumption while decreasing brake thermal efficiency, but higher injection pressure can improve combustion characteristics and increase brake thermal efficiency.
HEAT AND MASS TRANSFER
(2021)
Article
Chemistry, Applied
Mehmet Akcay, Ilker Turgut Yilmaz, Ahmet Feyzioglu
Summary: The study showed that hydrogen assisted intake air has a significant impact on combustion characteristics of a diesel fuel-waste cooking oil biodiesel blend fueled CI engine, particularly on the premixed pilot fuel combustion phase. The findings suggest that hydrogen enrichment does not have an adverse effect on ringing intensity.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Thermodynamics
Xiyu Yang, Xiaoyan Wang, Quan Dong, Zuo Ni, Jingdong Song, Tanqing Zhou
Summary: This study presents an innovative fuel injection rate measurement methodology for studying dual-fuel injection characteristics in a high-pressure natural gas direct injection engine. The results demonstrate two different upward trends in injection mass with increasing energizing time, with greater sensitivity observed for shorter energizing times. The duration of gas injection is influenced by both injection pressure and ambient pressure, and increases in either parameter lead to significantly longer injection durations and higher gas injection mass. The pilot diesel injection process has a notable effect on the gas injection rate.
Article
Thermodynamics
Manida Tongroon, Sathaporn Chuepeng
Summary: This study compared the emissions and heat release patterns of a premixed diesel engine using gasoline and ethanol as supplementary fuels. The results showed that gasoline premixture had higher thermal efficiency, while ethanol premixture had lower thermal efficiency. Increasing the ratio of supplementary fuel delayed the combustion phasing and reduced the quantities of nitrogen oxides, smoke, and total unburned hydrocarbon, but increased carbon monoxide emissions. Ethanol-diesel dual fuel had advantages in terms of smoke opacity but had a nitrogen oxides trade-off.
Article
Engineering, Chemical
Mohit Raj Saxena, Rakesh Kumar Maurya
Summary: This study investigates the influence of diesel injection pressure, injection timing, and port-injected gasoline mass on nanoparticle emissions from a light-duty gasoline-diesel RCCI engine. The results show that changes in diesel injection pressure and timing have a significant impact on nanoparticle emissions, while increasing port fuel injected mass leads to higher particle concentration and unburned hydrocarbon emissions.
PARTICULATE SCIENCE AND TECHNOLOGY
(2021)
Article
Green & Sustainable Science & Technology
Ashutosh Chauhan, Shweta Singh, Atul Dhar, Satvasheel Powar
Summary: Pineapple is a delicious and healthy tropical fruit with various benefits. Drying is the only possible solution to ensure availability and extended shelf-life, but choosing the right method is crucial for preserving nutrients and shortening drying time. Hybrid MCDM models are used to identify the best drying method for pineapple.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Energy & Fuels
Mohit Barthwal, Atul Dhar, Satvasheel Powar
Summary: Thermal energy storage systems for air-conditioning applications have been modeled and optimized, with analysis conducted on energy, exergy, environmental, and economic aspects in both full and partial operating modes. Optimization results showed that full operating mode led to higher exergy efficiency for both systems, while partial operating mode may be a more cost-effective operational strategy.
Article
Chemistry, Physical
Omprakash Sarkar, J. Santhosh, Atul Dhar, S. Venkata Mohan
Summary: This study successfully integrated acidogenesis and methanogenesis processes, achieving higher production of biohythane from food waste. By operating with two different parent cultures and in two phases, the study overcame the obstacle of single-phase operation to maximize energy recovery from untreated substrate.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Review
Environmental Sciences
Sahil Rana, Mohit Raj Saxena, Rakesh Kumar Maurya
Summary: This study presents a review of the physical and chemical characteristics of particulate emissions from compression ignition (CI) engines. It was found that engine operating parameters and alternative fuels have significant effects on the particle number concentration, morphology, nanostructure, and oxidative reactivity of the particulate matter (PM).
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Energy & Fuels
Sarthak Nag, Atul Dhar, Arpan Gupta
Summary: This study found that EGR has different effects on combustion during hydrogen-diesel co-combustion. With an increase in EGR, the combustion process is negatively affected at low loads, while combustion variability improves at higher loads.
Article
Mechanics
Sharey Deep Guleria, Atul Dhar, Dhiraj V. Patil
Summary: This article presents experimental insights into the physics of water entry of hydrophobic spheres. Various parameters and dynamics of the trapped air-cavity are studied, including cavity formation, retraction, and Worthington-jet analysis. Different cavity shapes exhibit unique radial dynamics and surface energy characteristics, with specific behaviors such as bubble shedding observed for shallow seal conditions.
Review
Engineering, Civil
Mohit Raj Saxena, Rakesh Kumar Maurya, Prashant Mishra
Summary: This study focuses on the utilization of methanol in compression ignition engines, particularly in dual-fuel combustion mode, which can significantly reduce NOx, CO, soot, and nano-particle emissions. The combustion of methanol-diesel blended fuel shows potential to enhance performance while reducing emissions, although unburnt HC emissions may increase in methanol-diesel dual-fuel operation.
JOURNAL OF TRAFFIC AND TRANSPORTATION ENGINEERING-ENGLISH EDITION
(2021)
Article
Thermodynamics
Ajay Singh, Rakesh Kumar Maurya
Summary: This study examines a noisy nonlinear dynamical (NND) model for cyclic variations in SI engines using nonlinear time series methods. The analysis reveals that noise obscures the local patterns and higher periodic orbits of the dynamics, leading to fuzzy bifurcation diagrams. Increasing noise level and uncombusted residuals shift the onset of bifurcations towards higher equivalence ratio in the NND map. The application of the NND model to represent SI engine combustion dynamics with higher internal EGR results in a more complex dynamical nature.
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2023)
Article
Thermodynamics
Ajay Singh, Rakesh Kumar Maurya
Summary: This study investigates the cyclic combustion dynamics of HCCI engine and utilizes nonlinear dynamic methods. The results show that higher engine speeds lead to greater combustion dynamic variations. Relative air-fuel ratios and intake air temperatures affect the deterministic characteristics of combustion.
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2023)
Review
Energy & Fuels
Tomesh Kumar Sahu, Pravesh Chandra Shukla, Giacomo Belgiorno, Rakesh Kumar Maurya
Summary: Alcohol fuels, namely ethanol and methanol, have emerged as important alternatives for sustainable transportation due to their lower CO2 emissions. Their higher octane number suits spark ignition engines, while lower blend ratios can be used in compression ignition engines. Research on alcohol utilization in CI engines improves the soot-NOx trade-off characteristic and helps meet future emissions regulations. The potential of alcohol fuels for sustainable transportation lies in their overall lower CO2 emissions compared to diesel.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2022)
Article
Engineering, Mechanical
Inderpal Singh, Parmod Kumar, Atul Dhar
Summary: This study focuses on the waste heat recovery from engine coolant and provides a complete thermodynamic analysis, cycle configuration, and system size design. It is found that by using dual expander under fluctuating flow and heat input conditions, the cycle thermal efficiency can be enhanced.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE ENGINEERING
(2022)
Article
Environmental Sciences
M. R. Saxena, S. Rana, R. K. Maurya
Summary: This study investigates the in-cylinder heat release features and nanoparticle emissions of a CNG-diesel RCCI engine. The study aims to determine the impact of low-temperature heat release (LTHR) and high-temperature heat release (HTHR) on particle emissions. LTHR is a smaller peak before the main HTHR on the heat release rate curve. The LTHR and HTHR are not separated on the curve, but the LTHRR and HTHRR rates are determined. The amount of LTHR and HTHR is calculated by analyzing the area under the respective LTHRR and HTHRR curves. The experiments show that increasing CNG masses result in reduced LTHR and HTHR, leading to the formation of nucleation mode particles (NMPs) and an increase in total particulate matter (PN).
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Biotechnology & Applied Microbiology
Hemant Thakur, Narendra Kumar Rashmi, Narendra Kumar Verma, Vikas Sharma, Shrawan Kumar, Atul Dhar, Tulika Prakash, Satvasheel Powar
Summary: In this study, anaerobic co-digestion of food waste, bio-flocculated sewage sludge, and cow dung was tested using a synthetic consortia called E(C2)Tx. The co-digestion resulted in the highest hydrogen production and least carbon dioxide release. Metagenomic sequencing showed the dominance of hydrolysing microbes during the digestion process. The experiments were scaled up in two continuous digesters, and the highest VFA production and bio-methane yield were recorded.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2023)
Article
Thermodynamics
Punit Kumar, P. Anil Kishan, M. Nikhil Mathew, Atul Dhar
Summary: This study investigated the spark ignition of H2-air mixture in a constant volume combustion chamber at an initial pressure of 3 bar. It was found that the combustion chamber pressure rise is negatively dependent on the initial temperature, with peak pressure decreasing as initial temperature increases. Both stretched and unstretched flame velocities increase with initial temperature, but decrease as the mixture becomes leaner due to changes in free radicals concentration in the combustion chamber.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2021)
Article
Thermodynamics
Yunxia Ma, Fei Liu, Honggang Pan, Hongjian Zhang, Shuxia Yan, Ailing Zhang
Summary: This paper proposes a dynamically tunable and switchable perfect infrared absorber that exhibits excellent electrical regulation performance and high absorptance. The absorption mechanism is explained using a multiple interference model, and it is proven to be polarization insensitive.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
F. J. dos Santos, G. S. M. Martins, M. Strobel, L. Beckedorff, K. V. de Paiva, J. L. G. Oliveira
Summary: This study investigates the effects of inlet conditions and plate's features on the thermal-flow performance of a gasket plate heat exchanger (GPHE) and assesses the impact of a modified tightening distance on its performance. No systematic study on the combined effects of inlet conditions and assembly accuracy on GPHE performance has been conducted before.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Alok K. Ray, Dibakar Rakshit, K. Ravi Kumar, Hal Gurgenci
Summary: The low thermal conductivity of phase change materials limits the heat transfer rate and application of latent heat storage systems. This numerical study examines the impact of two passive heat transfer enhancement techniques on the thermal performance of a latent heat storage system. The results show that the orientation and position of the heat transfer fluid tube have significant effects on the charging duration, while the discharging duration remains unchanged. The combined effect of orientation and eccentricity reduces the charging duration, but increases the discharging duration compared to the concentric domain.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Yalu Han, Yanlong Wang, Chenyang Liu, Xinmin Hu, Yin An, Zhengcai Li, Jiaxun Jiang, Lizhi Du
Summary: This paper investigates the calculation method of thermal conductivity in NAPLs-contaminated soils. By establishing NAPLs-contaminated soil models and using the Lattice Boltzmann Method (LBM) for calculation, an optimized three-dimensional model with high computational accuracy and efficiency is obtained. The study also finds that saturation and Nz parameters have a significant impact on calculation time, while the thermal conductivity of the two-dimensional model is more sensitive to anisotropy. The influence of porosity and NAPLs content on thermal conductivity should be considered during in-situ thermal desorption.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Mostafa Taha, Song Zhao, Aymeric Lamorlette, Jean-Louis Consalvi, Pierre Boivin
Summary: For the first time, large-eddy simulations (LES) of the near-field region of large-scale fire plumes were performed using a pressure-based Lattice Boltzmann method (LBM) with low-Mach number approximation. The simulations showed quantitative agreement with experimental data and were consistent with previously-published numerical studies. The study demonstrated the computational efficiency of the proposed LBM solver in tackling fire-induced flows, suggesting LBMs as a good alternative candidate for modeling fire-related problems.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Weixin Zhang, Yehang Xie, Yuqiang Ding, Zhao Liu, Zhenping Feng
Summary: This study investigated the impact of upstream slot leakage on the endwall film cooling characteristics of turbine blades. Pressure Sensitive Paint (PSP) technology was used to measure the film cooling characteristics, and numerical analysis was conducted to evaluate the aerodynamic performance. It was found that increasing the mass flow ratio of the upstream slot enhanced film cooling, decreased aerodynamic losses, and reduced the strength of passage vortex. However, reducing the distance between the slot and the blade leading edge only enhanced film cooling without affecting the leakage coverage area.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Rui Zhang, Zhen-lei Li, Yan-sheng Zhang, Dong Chen, Guo Yuan
Summary: This study discusses the heat transfer behavior of different jet forms on steel tubes. The results show that the annular jet performs better in terms of cooling intensity and uniformity. The cooling performances of the two jet forms are similar when the steel tube size is small. Therefore, the planar jet can be considered for smaller diameters due to its simplicity, low cost, and convenience in application.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
A. R. Khoei, A. M. Orvati Movaffagh, A. Rezaei Sameti
Summary: This paper presents a comprehensive study on the thermo-mechanical characteristics of oxide-coated aluminum nano-powder. It is found that the thermal conductivity of oxide-coated aluminum nano-powder is significantly lower than that of the bulk aluminum, and it is affected by the density and temperature.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Yanjin Wang, Jintao Xiong, Lingyu Chen, Zhihai Lv, Qian Wang
Summary: A solar radiation transfer model for spray cooling double skin facade (SC-DSF) is proposed in this study. The model is validated by experimental results and various influence factors are analyzed. The effectiveness of adjusting droplet coverage rate and size is also evaluated.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Bostjan Zajec, Blaz Mikuz, Anil Kumar Basavaraj, Marko Matkovic, Matej Tekavcic, Martin Draksler, Leon Cizelj, Bostjan Koncar
Summary: We have developed an advanced experimental setup to investigate flow and heat transfer in an annular channel. The setup allows heat transfer measurements and flow visualization using a temperature-controlled inner tube. Measurements can be conducted in both single-phase and two-phase flow regimes. The setup ensures a uniform velocity field in the annular channel using specially designed inlet and outlet headers. The inner copper tube is heated by water and contains turbulators for enhanced heat transfer and thermocouples for temperature measurement. A three-dimensional conjugate heat transfer CFD model has been developed and validated to accurately estimate heat losses in the setup. This study demonstrates the importance of numerical simulations in improving the interpretation of complex experimental results.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Weijie Chen, Ke Wang, Yongqing Wang, Shantung Tu, Zunchao Liu, Huijuan Su
Summary: In this study, a novel gradient porosity transpiration cooling plate structure (GP-TCPS) is proposed to alleviate heat transfer deterioration caused by non-uniform temperature distribution in transpiration cooling plate structure (TCPS). Computational fluid dynamics (CFD) and response surface method (RSM) were used for qualitative and quantitative analysis of the flow and heat transfer of GP-TCPS. The optimized structure of GP-TCPS significantly improves temperature uniformity, injection pressure, and average cooling efficiency compared to traditional TCPS.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
R. Essam, A. Elsaid, W. K. Zahra
Summary: This study presents a novel bioheat model for simulating heat transfer in skin tissue. The model offers an improved representation of thermal dynamics in the skin and has been validated using numerical solutions and experimental measurements. The study highlights the importance of incorporating vascular inlet parameters and thermal relaxation effects in the thermal profile, and suggests potential applications in thermal therapy and wound healing.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Dongbo Shi, Tao Xu, Zifeng Chen, Di Zhang, Yonghui Xie
Summary: The cooling structure design of turbine blades is crucial for the safety and reliability of the gas turbine set. This research investigates different arrangement schemes, including dimple/protrusion arrangements, to enhance the cooling performance. The results show that the arrangement scheme with both passes arranged by dimples has the best comprehensive thermal performance.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Emrehan Guersoy, Hayati Kadir Pazarlioglu, Mehmet Guerdal, Engin Gedik, Kamil Arslan
Summary: The thermo-hydraulic performance of Al2O3/H2O nanofluid with different nanoparticle shapes flowing in a sudden expansion tube with variable sudden expansion inclination angles and elliptical dimpled fins with different diameters were numerically investigated. The results showed that the nanoparticle shapes, sudden expansion inclination angles, and elliptical dimpled fin have significant impact on the thermo-hydraulic performance. This study reveals the novelty and importance of these factors in the research.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Rukun Hu, Xinyu Huang, Xinyu Gao, Liu Lu, Xiaohu Yang, Bengt Sund
Summary: This study examines the impact of applying bottom cross-cut on PCM's spatial distribution in a horizontal LHTES unit using numerical simulation. The findings show that bottom cross-cut can improve the heat storage rate and natural convection heat transfer gain.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
