Article
Thermodynamics
Yifei Gong, Xiao Ma, Kai Hong Luo, Hongming Xu, Shijin Shuai
Summary: This study investigates the evaporation of a multicomponent fuel droplet under supercritical conditions using molecular dynamics simulations. The study focuses on the effects of multicomponent ambient gases and the relative motion between the droplet and the ambient. The results show that the transition from evaporation to diffusion mode depends on the temperature, pressure, ambient gases, and relative velocities.
Article
Energy & Fuels
Yaquan Ai, Han Wu, Vladimir Markov, Jianhui Zhao, Xiangrong Li
Summary: Supercritical transition of fuel spray in diesel engines, especially supercharged ones, has been widely studied. However, its significant impact on fuel-air mixing under relevant conditions is still uncertain and needs careful evaluation.
Article
Energy & Fuels
Yifei Gong, Guowei Xiao, Xiao Ma, Kai Hong Luo, Shijin Shuai, Hongming Xu
Summary: This study investigated the phase transition processes of different hydrocarbon mixtures under supercritical conditions, proposing a new criterion for determining the transition of mixing modes. The results showed that ambient pressure and temperature significantly influenced the dominant mixing mode transition.
Article
Thermodynamics
Ambrus Both, Daniel Mira, Oriol Lehmkuhl
Summary: This study assesses Lagrangian droplet evaporation models commonly used in spray combustion simulations, aiming to identify the influence of modeling decisions on individual droplet behavior. The most suitable models for numerical studies of spray combustion systems are determined.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Energy & Fuels
Xiaoyu Chen, Xi Xi, Ge Xiao, Lenan Zhang, Zixin Wang, Wuqiang Long
Summary: This study experimentally investigates the evaporation characteristics of emulsified heavy fuel oil (HFO) with varying water content. Three distinct phases are identified: initial heating, fluctuation evaporation, and steady evaporation. The fluctuation evaporation of emulsified HFO involves two sub-phases and is characterized by heat equilibrium, which is unique to this fuel type. The duration of the initial heating and fluctuation evaporation phases is influenced by ambient temperature and water content. The evaporation characteristics of HFO and emulsified HFO differ due to the occurrence of frequent micro-explosions in the latter, resulting in a significantly shorter droplet lifetime. A regression formula is proposed to establish the relationship between droplet lifetime, temperature, and water content for practical application.
Article
Thermodynamics
Shangpei Dai, Xuhong Jia, Xiaoyu Zhang, Jing Tang, Junhao Ma, Quanyi Liu, Yulong Zhu
Summary: This study experimentally investigated the evaporation behavior of different fuel droplets on hot surfaces, revealing various thermal patterns and heat transfer mechanisms. The results showed that the evaporation rate of droplets is largely determined by the saturation vapor pressure.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Mohd A. F. Rosli, A. Rashid A. Aziz, Mhadi A. Ismael, Nimir O. Elbashir, Ezrann Z. A. Zainal, Masri Baharom, Salah E. Mohammed
Summary: The study revealed that among the tested GTL-diesel fuel blends, G100 does not exhibit puffing, while G20 shows no micro-explosions. In comparison, the other blends experience both phenomena. Additionally, G50 has the highest number of child droplets, and G20 has the highest enlargement factor observed.
Article
Energy & Fuels
Deqing Mei, Yu Fang, Dengpan Zhang, Dongmei Guo, Zhiyu Chen
Summary: This study investigates the effect of nanoparticles on the evaporation of nano-fuels and reveals the mechanism of heat and mass transfer induced by the dispersion of nanoparticles. The addition of nanoparticles suppresses the evaporation of fuel droplets at 400 degrees C, while enhancing the evaporation at 700 degrees C by promoting micro-explosion. The mass concentration and particle size play significant roles in determining the extent of evaporation suppression or promotion.
Article
Energy & Fuels
Shiquan Shen, Huan Liu, Yi Liu, Xi Liu, Houzheng Hu, Zhiming Hu, Tianyou Wang
Summary: Emulsion fuel technology is widely recognized as a potential alternative fuel to improve engine fuel efficiency and reduce pollutant emissions without modifying the engine. Micro-explosion in fuel spray has been identified as the key factor in enhancing fuel combustion efficiency and reducing harmful emissions. However, there have been limited studies on the micro-dynamic processes inside emulsion droplets before micro-explosion occurs during heating. Understanding these micro-dynamic processes is crucial for explaining micro-explosion.
Article
Construction & Building Technology
Yihuan Yan, Xiang Fang, Xueren Li, Yao Tao, Ping Yan, Jiyuan Tu
Summary: This study numerically investigated the impact of ambient conditions on the evaporation process of full-range cough expelled droplets. It found that ambient relative humidity has a more pronounced effect on droplet evaporation compared to temperature. Additionally, a cost-efficient approach was developed to represent the instantaneous droplet diameter and fulfill the time-dependent dynamic size distributions of evaporated droplets under various ambient conditions.
BUILDING AND ENVIRONMENT
(2022)
Article
Thermodynamics
Xiaoyu Chen, Xi Xi, Lenan Zhang, Zixin Wang, Zechuan Cui, Wuqiang Long
Summary: This study investigates the bubble behaviors and droplet micro-explosion characteristics during the evaporation of emulsified heavy fuel oil (HFO) droplets. The dual-mode micro-explosion of emulsified HFO, accompanied by a honeycomb-like structure, is clarified for the first time. The working conditions of droplet breakup modes and the appearance of the honeycomb-like structure are summarized based on experimental results, and a regression formula is introduced to express the dependence of micro-explosion intensity on ambient temperature and water content. This investigation provides guidance for the application of emulsified HFO.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Siyu Xie, Yunpeng Fu, Ping Yi, Tie Li, Run Chen
Summary: The transitional behavior of multi-component sprays under ECN Spray-A conditions has been investigated using numerical methods in this study. The development and implementation of robust thermodynamic equilibrium solvers and multi-component droplet evaporation models in OpenFOAM have led to new insights. The results indicate that dilute sprays are more prone to transitioning to the supercritical mixing regime, while dense sprays experience a decrease in trans-critical possibility before the end of injection due to the cooling effect of extensive evaporation. Additionally, it was found that multi-component diesel sprays are more likely to transition to the supercritical regime than n-dodecane sprays due to their low mixture critical temperature and evaporation rate.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Bo Yuan, Zhaowen Wang, Junhui Cao, Yuhan Huang, Yuan Shen, Zhihui Song, Huali Zhao, Xiaobei Cheng
Summary: Under the background of energy saving and emission reduction, methanol is considered an ideal alternative fuel for gasoline due to its renewability, high combustion efficiency, and low emissions. However, the cold start of methanol port fuel injection engines is an issue. To comprehensively understand the feasibility and mechanisms of methanol as a substitute for gasoline, evaporation characteristics of methanol and gasoline droplets at low temperatures were investigated. Additionally, the effects of various factors on spray characteristics and spray impingement on a valve were studied. Methanol showed potential as a substitute for gasoline when considering inlet flow and low injection pressure, but may not be suitable for direct valve impact.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Energy & Fuels
Mohd A. F. Rosli, Mhadi A. Ismael, A. Rashid A. Aziz, Salah E. Mohammed, A. B. Osman, Rasheed Adewale Opatola
Summary: This study investigates the evaporation behavior and droplet lifetime of GTL fuel blends using a single droplet drop test. The results show that increasing the GTL fuel ratio decreases the heating phase duration and evaporation rate while increasing the steady evaporation phase duration and droplet lifetime, which is beneficial for combustion.
Review
Chemistry, Applied
Zhaowen Wang, Bo Yuan, Yuhan Huang, Junhui Cao, Yuzhou Wang, Xiaobei Cheng
Summary: This paper provides a systematic review on the droplet evaporation characteristics of different fuels. It introduces experimental methods and mechanisms of droplet evaporation. The study finds that the evaporation of droplets is influenced by various factors such as composition, concentration, and the addition of nanoparticles. Future research should focus on advanced experimental and numerical methods, and the integration of droplet evaporation with spray and combustion processes.
FUEL PROCESSING TECHNOLOGY
(2022)
