Article
Thermodynamics
Shan Zeng, Yuan Jing, Chenheng Yuan
Summary: This study compares the characteristics of HCCI combustion in free piston linear engines and traditional crankshaft engines. The results indicate that while the final heat release of both engines is similar, the low-temperature reaction stage in FPLE occurs later, leading to a lag in the high-temperature reaction stage.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Energy & Fuels
Masoud Rabeti, Ali Akbar Ranjbar, Omid Jahanian, Seyed Mohammad Safieddin Ardebili, Hamit Solmaz
Summary: Homogeneous charge compression ignition (HCCI) engine shows potential as an alternative to traditional internal combustion engines due to its high thermal efficiency and low emissions. This study compared the accuracy of different heat transfer models and found that Assanis and Hohenberg models performed the best in estimating heat transfer in an HCCI engine. The engine operating parameters, such as intake pressure, equivalence ratio, and engine speed, were found to have significant impacts on heat flux.
Article
Engineering, Multidisciplinary
M. F. Dabbaghi, M. B. Baharom, Z. A. Abdul Karim, A. Rashid A. Aziz, Salah E. Mohammed, Ezrann Z. A. Zainal
Summary: The study improved the developed CR engine model and found that Annand's model had the best prediction for combustion characteristics.
ALEXANDRIA ENGINEERING JOURNAL
(2021)
Article
Energy & Fuels
Alper Calam, Serdar Halis, Bilal Aydogan, Can Hasimoglu
Summary: This study aimed to control the HCCI combustion phase by testing different ratios of low and high reactivity pure fuels and their mixtures. The analysis showed that HN75 fuel provided the best operating conditions and low CO and HC emissions in HCCI combustion.
Article
Energy & Fuels
Samet Celebi, Bekir Duzcan, Usame Demir, Ahmet Uyumaz, Can Hasimoglu
Summary: The effects of using light naphtha in a diesel engine operated with HCCI mode were experimentally investigated in the current study. Different fuel blends were tested to measure engine performance and emissions. The results showed that under certain conditions, blending light naphtha with gasoline can effectively reduce fuel consumption and emissions.
Article
Chemistry, Physical
Norhidayah Mat Taib, Wan Mohd Faizal Wan Mahmood, Wan Aizon W. Ghopa, Hasan Koten, Mohd Radzi Abu Mansor
Summary: This paper investigates the effect of hydrogen combustion in various noble gases on heat distribution and heat transfer. It is found that hydrogen combustion in helium produces faster combustion progress and higher heat temperature. However, there is a risk of detonation in neon and argon, resulting in high local heat flux and not suitable for engine operation. Overall, helium is the best working gas for controlling combustion and heat transfer.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Multidisciplinary
Simrandeep Bahal, Chander Shekhar Sharma
Summary: This study presents numerical modeling of dropwise condensation on a microgrooved hydrophobic surface and investigates the surface renewal mechanisms. The results show that the microgrooved surface promotes earlier droplet shedding, resulting in lower area coverage and higher condensation heat flux. The spontaneous dewetting transition of microgrooves is found to dominate the overall surface renewal rate. The study also evaluates the effect of microgroove geometry on condensation heat transfer performance.
Article
Thermodynamics
Timothy F. Miller
Summary: The Johnson Thermoelectric Converter (JTEC) is approximated as an Ericsson cycle thermodynamic heat engine without moving parts. The operation involves hydrogen flow, electron stripping, and electrochemical pumping to sustain pressure differential. Efficiency, net power production, and power density are influenced by various factors such as operating temperatures and pressures, device geometry, and thermophysical properties.
Article
Thermodynamics
Ting Zhang, Tingting Jing, Fei Qin, Xing Sun, Wenqiang Li, Guoqiang He
Summary: This paper presents a fluid-structure coupled topology optimization design of the regenerative cooling channel to improve heat transfer efficiency. Detailed three-dimensional numerical simulations were conducted to investigate the heat transfer processes of hydrocarbon fuel in the topology-optimized channels. Results reveal that the topology-optimized channel has significantly improved the heat transfer efficiency and flow distribution compared to the traditional straight cooling channel.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Kabbir Ali, Riffat Amna, Mohamed I. Hassan Ali
Summary: The objective of this paper is to investigate the use of H2/H2O2 fuel in a free carbon combustion engine for HCCI engine. The study analyzes Combustion phasing, IMEP, and thermal efficiency at different effective equivalence ratios and engine speeds. A 3D CFD model is developed and validated for controlling the combustion phasing of the HCCI engine by adjusting the volume fraction of H2O2 in the fuel mixture. The results show that H2O2 reduces inlet mixture temperature, improves combustion phasing, and enhances combustion and thermal efficiencies.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Energy & Fuels
Litian Su, Meng Zhang, Jinhua Wang, Zuohua Huang
Summary: The two-dimensional direct numerical simulation (DNS) was used to investigate the impact of temperature and composition stratifications on the ignition characteristics of dimethyl-ether (DME)/air mixture at three initial mean temperatures. The results indicate that temperature stratification significantly affects the distribution of mean heat release rate (HRR), while composition stratification can reduce the peak value of HRR and spread out the distribution. Temperature stratification has a greater effect on reducing HRR in the first ignition stage compared to composition stratification. Different T-Phi correlations all reduce the peak value of HRR in the first ignition stage. In the high-temperature stage, UC and PC T-Phi fields can significantly reduce the peak value of HRR and extend the combustion duration, while NC T-Phi field shows no visible effect on HRR. The study also distinguished between flame propagation mode and volumetric auto-ignition mode based on HRR contours, budget term, and volume-averaged temperature gradient, suggesting that the mass fraction of YOH+HO2 and Y-H is a more reasonable choice for tracking the flame front.
Article
Chemistry, Physical
M. Feroskhan, Saleel Ismail, Shreyash Hemant Panchal
Summary: This study investigates the effect of methane enrichment on the output parameters of a Homogeneous Charge Compression Ignition (HCCI) engine. The results show that methane enrichment improves brake thermal efficiency, reduces emissions, and accelerates combustion.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Review
Environmental Sciences
Sanjeev Kumar Verma, Subhashish Gaur, Tabish Akram, Samsher Gautam, Anil Kumar
Summary: This paper reviews the emission characteristics of HCCI engines using different fuels and additives, as well as the impacts of various operating conditions on emissions. HCCI technology offers higher efficiency and cleaner combustion, reducing NOx and particulate matter emissions. The use of different fuels in HCCI engines can lead to varying emission outcomes.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Thermodynamics
Kazuhito Dejima, Osamu Nakabeppu
Summary: This study investigated the local instantaneous heat transfer characteristics of internal combustion engines using a MEMS sensor. It was found that the local heat flux and heat transfer coefficients exhibited strong cyclic variability, with adjacent points showing similar but different values, indicating the influence of turbulent eddies on local heat transfer at sub-millimeter scale.
APPLIED THERMAL ENGINEERING
(2022)
Review
Energy & Fuels
Shyamal Das, Biplab Kumar Debnath, Sushant Negi, Biplab Das, Sadegh Safari, Bale V. Reddy, Sumita Debbarma, Mehdi A. Ehyaei
Summary: This study focuses on research and development related to the homogeneous charge compression ignition (HCCI) engine. The impact of different operating conditions on combustion, emissions, and performance of HCCI engines is discussed, with particular interest in investigating the use of diesel fuel for its low NOx emissions. The study also explores the capability of the HCCI engine to utilize various fuels, ranging from biomass to diesel to gasoline, and addresses challenges associated with HCCI combustion and emissions.
ENERGY SCIENCE & ENGINEERING
(2023)
Article
Energy & Fuels
Huseyin Karadeniz, Hakan Serhad Soyhan, Cem Sorusbay
Article
Energy & Fuels
Kenan Gocmen, Hakan Serhad Soyhan
Article
Thermodynamics
Ahmet Aydin, Tahsin Engin, Halit Yasar, Alper Yeter, Ahmet Hulusi Perut
Summary: This study analyzed a cooling radiator developed for unmanned aerial vehicles using computational fluid dynamics (CFD). The results showed that a proper porous media model can be effectively used for both design and optimization considerations.
HEAT TRANSFER ENGINEERING
(2021)
Article
Thermodynamics
Nihat Bicer, Tahsin Engin, Halit Yasar, Ekrem Buyukkaya, Ahmet Aydin, Adnan Topuz
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2020)
Article
Engineering, Mechanical
Halit Yasar, Gultekin Cagil, Orhan Torkul, Merve Sisci
Summary: Engine tests are costly and time consuming, but using Deep Learning methods can predict engine characteristics accurately, reducing testing costs and accelerating development. A study predicting cylinder pressure with Deep Neural Network showed a high accuracy of 99.84%, demonstrating the effectiveness of Deep Learning in predicting engine pressures.
CHINESE JOURNAL OF MECHANICAL ENGINEERING
(2021)
Article
Energy & Fuels
Mansour Al Qubeissi, Nawar Al-Esawi, Hakan Serhad Soyhan
Summary: The previously developed approaches for fuel droplet heating and evaporation processes have been improved and generalized for a broad range of bio-fossil fuel blends. The Complex Fuel Surrogate Model (CFSM) aims to reduce the full composition of fuel to a much smaller number of components based on their mass fractions, which has been implemented into a commercial CFD code ANSYS Fluent to improve simulation accuracy.
Article
Energy & Fuels
Cemil Koyunoglu, Huseyin Karaca, Hakan Serhad Soyhan
Summary: The study utilized Computational Fluid Dynamics for reactor modeling of DME production from syngas in a fluid bed model, with a focus on physical optimization simulation to determine conditions for maximum gas-solid contact.
Article
Energy & Fuels
Usame Demir, Gokhan Coskun, Hakan S. Soyhan, Ali Turkcan, Ertan Alptekin, Mustafa Canakci
Summary: This study experimentally and numerically analyzed the effects of using conventional camshafts and electromechanical valve mechanisms (EMV) in a single-cylinder spark-ignition engine. Results showed that the use of EMV system significantly influences volumetric efficiency and parameters such as in-cylinder air flow.
Article
Energy & Fuels
Omer Boyukdipi, Gokhan Tuccar, Hakan Serhad Soyhan
Summary: The experimental study investigated the effects of NH3 as a fuel additive on engine vibration parameters, revealing that increasing levels of NH3 additive led to increased engine vibration and had a negative impact on engine vibration when blended with sunflower biodiesel. High accuracy rates were achieved in predicting vibration data through artificial neural networks models.
Article
Thermodynamics
Ahmet Aydin, Halit Yassar, Tahsin Engin, Ekrem Buyukkaya
Summary: The optimization of shell-and-tube heat exchangers is crucial for improving thermal efficiency and reducing operating costs. By optimizing the baffle design, lower pressure drops and better flow control can be achieved.
Article
Energy & Fuels
Mansour Al Qubeissi, Ayob Mahmoud, Moustafa Al-Damook, Ali Almshahy, Zinedine Khatir, Hakan Serhad Soyhan, Raja Mazuir Raja Ahsan Shah
Summary: Liquid fuel has traditionally been the primary energy source for internal combustion engines (ICE), but lithium-ion batteries (LIB) have replaced ICE for eco-friendly vehicles and reduced reliance on fossil fuels. This study compares different battery thermal management systems (BTMS) to maintain a temperature range of 15-35 degrees Celsius, prevent thermal runaway and temperature gradients, and improve LIB lifespan and performance. The proposed approach uses biodiesel as both the engine feed and coolant. Simulation results show that biodiesel fuels, such as palm, karanja, jatropha, and mahua oils, can effectively maintain LIB temperature within the optimum working range and outperform conventional coolants like air and 3M Novec.
Article
Energy & Fuels
Mustafa Metin Cam, Hakan Serhad Soyhan, Mansour Al Qubeissi, Cenk Celik
Summary: The design of energy efficient engineering systems is crucial for sustainable operation. This study focuses on optimizing the bell-type primary air nozzle used in CFB boilers through CFD simulations. By changing the nozzle geometry, pressure drop can be decreased and flow uniformity can be improved, resulting in energy savings and improved boiler operation.
Review
Multidisciplinary Sciences
Ridha Ennetta, Hakan Serhad Soyhan, Cemil Koyunoglu, Veli Gokhan Demir
Summary: With the increasing use of rapidly developing technology in daily life, the need for energy has become essential for human beings. This paper focuses on the application of biodiesel production technologies in the transportation industry, with a special emphasis on the importance of microwave-assisted biodiesel production technology in low-income countries.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2022)
Article
Thermodynamics
G. Coskun, U. Demir, H. S. Soyhan
Summary: This study simulated the spread of smoke and evacuation time in a University building during a possible fire. Fire dynamic simulations (FDS) were conducted for natural and forced smoke evacuation, and evacuation simulations were done for various scenarios at different exits. Fractional Effective Dose (FED) was used to evaluate the poisoning risk of occupants. The combination of forced smoke evacuation and evacuation from all exits in the basement had the lowest FED value.
JOURNAL OF APPLIED FLUID MECHANICS
(2022)
Article
Thermodynamics
Serdar Mert, Halit Yasar, Ufuk Durmaz, Adnan Topuz, Alper Yeter, Tahsin Engin
Summary: This article investigates the effects of Al2O3 nanoparticles on engine coolant, showing that nanoparticles can enhance the cooling performance of the radiator, resulting in a 17.46% increase in cooling power compared to the original coolant.
Article
Thermodynamics
Hai Zhao, Puzhen Gao, Xiaochang Li, Ruifeng Tian, Hongyang Wei, Sichao Tan
Summary: This study numerically investigates the interaction between flow-induced vibration and forced convection heat transfer in a tube bundle. The results show that the impact of flow-induced vibration on heat transfer varies in different flow velocity regions.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Rohit Chintala, Jon Winkler, Sugirdhalakshmi Ramaraj, Xin Jin
Summary: The current state of fault detection and diagnosis for residential air-conditioning systems is expensive and not suitable for widespread implementation. This paper proposes a cost-effective solution by introducing an automated fault detection algorithm as a screening step before more expensive tests can be conducted. The algorithm uses home thermostats and local weather information to identify thermodynamic parameters and detect high-impact air-conditioning faults.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
A. Azimi, N. Basiri, M. Eslami
Summary: This paper presents a novel optimization algorithm for improving the water-film cooling system of photovoltaic panels, resulting in a significant increase in net energy generation.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Duc-Thuan Phung, Chin-Hsiang Cheng
Summary: In this study, a novel CFDMD model is used to analyze and investigate the behavior of thermal-lag engines (TLE). The study shows that the CFDMD model effectively captures the thermodynamic behavior of the working gas and the dynamic behavior of the engine mechanism. Additionally, the study explores the temporal evolution of engine speed and the influence of various parameters on shaft power and brake thermal efficiency. The research also reveals the existence of a thermal-lag phenomenon in TLE.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Haiying Yang, Yinjie Shen, Lin Li, Yichen Pan, Ping Yang
Summary: The purpose of this article is to find a measure to improve the interfacial thermal transfer of graphene/silicon heterojunction. Through molecular dynamics simulation, it is found that surface modification can significantly reduce the thermal resistance, thereby improving the thermal conductivity of the graphene/silicon interface.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Qiong Wu, Yancheng Wang, Haonan Zhou, Xingye Qiu, Deqing Mei
Summary: This article introduces a visible methanol steam reforming microreactor, which uses an optical crystal as an observation window and measures the reaction temperature in real-time using infrared thermography. The results show that under lower oxygen to carbon ratio conditions, the microreactor has a higher heating rate and a stable gradient in temperature distribution.
APPLIED THERMAL ENGINEERING
(2024)
Review
Thermodynamics
Giulia Manco, Umberto Tesio, Elisa Guelpa, Vittorio Verda
Summary: In the past decade, there has been a growing interest in studying energy systems for the combined management of power vectors. Most of the published works focus on finding the optimal design and operations of Multi Energy Systems (MES). However, for newcomers to this field, understanding how to achieve the desired optimization details while controlling computational expenses can be challenging and time-consuming. This paper presents a novel approach to analyzing the existing literature on MES, with the aim of guiding practical development of MES optimization. Through the discussion of six case studies, the authors provide a mathematical formulation as a reference for building the model and emphasize the impact of different aspects on the problem nature and solver selection. In addition, the paper also discusses the different approaches used in the literature for incorporating thermal networks and storage in the optimization of multi-energy systems.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xuepeng Yuan, Caiman Yan, Yunxian Huang, Yong Tang, Shiwei Zhang, Gong Chen
Summary: In this study, a multi-scale microgroove wick (MSMGW) was developed by laser irradiation, which demonstrated superior capillary performance. The surface morphology and performance of the wick were affected by laser scan pitch, laser power, repetition frequency, and scanning speed. The MSMGW showed optimal capillary performance in alumina material and DI water as the working fluid.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Maofei Mei, Feng Hu, Chong Han
Summary: This paper proposes an effective local search method based on detection of droplet boundaries for understanding the dynamic process of droplet growth during dropwise condensation. The method is validated by comparing with experimental data. The present simulation provides an effective approach to more accurately predict the nucleation site density in future studies.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Rahul Kumar Sharma, Ashish Kumar, Dibakar Rakshit
Summary: The study explores the use of phase change materials (PCM) as a retrofit with Heating Ventilation and Air-conditioning systems (HVAC) to reduce energy consumption and improve air quality. By incorporating PCM with specific thickness and fin configurations, significant energy savings can be achieved in comparison to standard HVAC systems utilizing R134a. This research provides policymakers with energy-efficient and sustainable solutions for HVAC systems to combat climate change.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Zhenhua Ren, Xiangjin Meng, Xingang Qi, Hui Jin, Yunan Chen, Bin Chen, Liejin Guo
Summary: This paper investigates the heat transfer mechanism and factors influencing thermal radiation in the process of supercritical water gasification (SCWG) of coal, and proposes a comprehensive numerical model to simulate the process. Experimental validation results show that thermal radiation accounts for a significant proportion of the total heat exchange in the reactor and a large amount of radiant energy exists in the important spectral range of supercritical water. Enhancing radiative heat transfer can effectively increase the temperature of the reaction medium and the gasification rate.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Mauro Abela, Mauro Mameli, Sauro Filippeschi, Brent S. Taft
Summary: Pulsating Heat Pipes (PHP) are passive two-phase heat transfer devices with a simple structure and high heat transfer capabilities. The actual unpredictability of their dynamic behavior during startup and thermal crisis hinders their large-scale application. An experimental apparatus is designed to investigate these phenomena systematically. The results show that increasing the number of evaporator sections and condenser temperature improves the performance of PHP. The condenser temperature also affects the initial liquid phase distribution and startup time.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Ke Gan, Ruilian Li, Yi Zheng, Hui Xu, Ying Gao, Jiajie Qian, Ziming Wei, Bin Kong, Hong Zhang
Summary: A 3-dimensional enhanced heat pipe radiator has been developed to improve heat dissipation and temperature uniformity in cooling high-power electronic components. Experimental results show that the radiator has superior heat transfer performance compared to a conventional aluminum fin radiator under different heating powers and wind speed conditions.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xinyi Zhang, Shuzhong Wang, Daihui Jiang, Zhiqiang Wu
Summary: This study focuses on recovering waste heat from blast furnace slag using dry centrifugal pelletizing technology. A comprehensive two-dimensional model was developed to analyze heat transfer dynamics and investigate factors influencing heat exchange efficiency. The findings have important implications for optimizing waste heat recovery and ensuring safe operations.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xincheng Wu, An Zou, Qiang Zhang, Zhaoguang Wang
Summary: The boosting heat generation rate of high-performance processors is challenging traditional cooling techniques. This study proposes a combined design of active jet intermittency and passive surface modification to enhance heat transfer.
APPLIED THERMAL ENGINEERING
(2024)
