Effects of exhaust gas recirculation composition and temperature on microscopic mechanical properties of particles in a diesel engine

Zhao, Yang; Xu, Guangju; Li, Mingdi; Chen, Qingzhang

doi:10.1002/ep.13037

Cited by 4 publications

(5 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The adhesion energy can be expressed numerically as the integrated area in Figure 3a. Equation () shows the fitting formula of the X 1 → D curve, and Equation () shows the calculation formula of adhesion energy 13,27 :

({,, \begin{matrix} f_{ad ((), a)} goodbreak= 0.27 goodbreak- 2.03 / ([], 1 goodbreak+ \exp ((), 50 x goodbreak- 4)) \\ f_{ad ((), b)} goodbreak= 0.37 goodbreak- 1.87 / ([], 1 goodbreak+ \exp ((), 58.8 x goodbreak- 2.59)) \\ f_{ad ((), c)} goodbreak= 0.5 goodbreak- 2.52 / ([], 1 goodbreak+ \exp ((), 50 x goodbreak- 3.8)) \end{matrix})

W_{ad} goodbreak= \int_{X_{2}}^{X_{1}} f_{ad} italicdz .

…”

Section: Results and Analysismentioning

confidence: 99%

“…Equation (11) shows the fitting formula of the X 1 ! D curve, and Equation (12) shows the calculation formula of adhesion energy 13,27 :…”

Section: Adhesion Energymentioning

confidence: 99%

“…D'Alessio et al 12 proposed that the attraction force ( F at ) and adhesion force ( F ad ) between soot particles are important parameters for the agglomeration characteristics and that the van der Waals force between particles is the main cause of particle attraction. Zhao et al 13 studied the micromechanical characteristics of diesel engine particles. It showed that particle agglomeration increased as the exhaust temperature increased and the main form of agglomeration changed from liquid bridge forces to van der Waals forces.…”

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Correlation analysis of mechanical and state characteristics of diesel engine exhaust particles

Liu

Zhang

Wang

2022

Env Prog and Sustain Energy

View full text Add to dashboard Cite

Aiming at the influence of diesel engine exhaust particle mechanical characteristics on the state characteristics, studies were carried out using atomic force microscopy, high-resolution transmission electron microscopy, and x-ray small-angle scattering.The variation rules of cluster-particle interaction force and state characteristic parameters such as particle morphology and spatial structure were discussed. According to the principle of normalization, the relationship between the mechanical and state characteristics of the particles is analyzed. The results show that as the particle size increases in the exhaust process, the attractive force F at , adhesion F ad, and adhesion energy W ad increase between the particles, F at from 1.27 to 1.58 nN, F ad from 3.75 to 4.38 nN, W ad from 2.17 Â 10 À16 to 2.44 Â 10 À16 J. The particles are gradually agglomerated, and the cluster size is increased, indicating a certain relationship between the mechanical characteristics of the particles and the morphology. Along the exhaust direction, the particle equivalent diameter increases, and the mechanical characteristics are enhanced, while the organic matter and moisture in the exhaust are continuously adsorbed, aggravating the aggregation and shrinkage between the particles. The scattering characteristic parameters q min and q T decrease, q min from 0.34 to 0.28 and q T from 0.72 to 0.63, the pore structure parameters decrease, the pore number concentration decreases, the peak pore size changes from 7-9 nm to 5-6 nm, the agglomerate particle structure defects decrease and the density is increased, indicating that there is a certain relationship between the mechanical characteristics of the particles and the spatial structure.diesel engine, exhaust particles, mechanical characteristics, state characteristics | INTRODUCTIONDue to their high thermal efficiency, high reliability, and fuel economy, diesel engines are still widely used in transportation and power generation. 1,2 However, particulate matter emissions from diesel engines are one of the primary sources of environmental pollutants. The emission of particulate matter negatively impacts the environment and harms human health. Fine particles cause respiratory, cardiovascular, and neurological diseases. 3,4 With the increasingly stringent emission regulations, the quality and quantity of diesel particulate emissions have been strictly limited. 5 In diesel engines' exhaust process, particles are prone to secondary growth processes such as collision and aggregation, condensation, and agglomeration, promoting the reduction of the number of particles and the increase of the cluster particles volume. [6][7][8] Relevant studies have shown that force between particles is the direct cause of particle agglomeration, 9,10 affecting the spatial structure parameters, such as inter-particle porosity fractal dimension characteristics. 11 Studying the particles' mechanical characteristics

show abstract

({,, \begin{matrix} f_{ad ((), a)} goodbreak= 0.27 goodbreak- 2.03 / ([], 1 goodbreak+ \exp ((), 50 x goodbreak- 4)) \\ f_{ad ((), b)} goodbreak= 0.37 goodbreak- 1.87 / ([], 1 goodbreak+ \exp ((), 58.8 x goodbreak- 2.59)) \\ f_{ad ((), c)} goodbreak= 0.5 goodbreak- 2.52 / ([], 1 goodbreak+ \exp ((), 50 x goodbreak- 3.8)) \end{matrix})

W_{ad} goodbreak= \int_{X_{2}}^{X_{1}} f_{ad} italicdz .

…”

Section: Results and Analysismentioning

confidence: 99%

“…Equation (11) shows the fitting formula of the X 1 ! D curve, and Equation (12) shows the calculation formula of adhesion energy 13,27 :…”

Section: Adhesion Energymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Correlation analysis of mechanical and state characteristics of diesel engine exhaust particles

Liu

Zhang

Wang

2022

Env Prog and Sustain Energy

View full text Add to dashboard Cite

show abstract

“…CNTs are good heat conductors and can significantly improve the heat-transfer performance of liquids. The application of CNTs to enhance the heat transfer in grinding fluids is of good value [34,35]. Figure 6a shows the influence of the concentration of nanoparticles on the thermal conductivity.…”

Section: Performance Testing Of Nanofluid and Nano-capsule Grinding W...mentioning

confidence: 99%

Synergistic Lubrication Mechanism of Nano-Fluid and Grinding Wheel Prepared by CNTs@T304 Nano-Capsules

et al. 2023

View full text Add to dashboard Cite

Grinding fluid often struggles to enter the grinding area and overcoming this challenge has been a major focus of research in recent years. Therefore, CNTs@T304 nano-capsules are prepared by filling the cavities of CNTs with a lubricant of T304. CNTs@T304 nano-capsules were used as an additive in this paper to prepare resin grinding wheels and nanofluids, respectively. The resin wheels filled with nano-capsules were used for grinding under the lubrication of nanofluids, and T304 could then be released to the grinding area to play a self-lubricating role during grinding. First, CNTs@T304 nano-capsules were characterized, and the properties of the prepared grinding wheels and nanofluids were tested. Second, the effects of the filling of nano-capsules and grinding speed on the grinding force, grinding temperature, surface roughness, and grinding ratio were studied. Finally, the lubrication mechanism of the nano-capsules was revealed through surface analysis of the workpiece. The results suggested that nano-capsules had good thermal stability and the nanofluid prepared from them exhibited good dispersion stability and thermal conductivity. The grinding wheel was found to satisfy the service conditions when the filling content was less than 15%. Compared with a common wheel, the grinding force and grinding temperature were reduced by 24% and 28%, respectively, and the surface roughness of the workpiece and the grinding ratio were increased by 18% and by 21%, respectively, when grinding GCr15 steel with the nano-capsule wheel. Lubrication with nanofluids could further reduce the grinding force, grinding temperature, and surface roughness values. During grinding, the self-lubrication film formed by the T304 released from the nano-capsules in the wheel served first and foremost as a lubricant. The intervention of the nanofluid enhanced the heat-exchange effect and lubrication efficiency in the grinding zone.

show abstract

Assessing the hazard of diesel particulate matter (DPM) in the mining industry: A review of the current state of knowledge

Azam,

Liu,

Bhattacharyya

et al. 2024

Int J Coal Sci Technol

View full text Add to dashboard Cite

In the confined spaces of underground mines, the exposure of over 10,000 miners in the U.S. to diesel exhaust and diesel particulate matter (DPM) is an occupational inevitability, particularly in metal and nonmetal mineral extraction. These workers routinely operate amidst diesel-powered equipment, often outdated and highly polluting, extracting resources such as limestone, gold, and salt. The acute health effects of such exposure are significant, leading to symptoms like headaches and flu-like conditions, with the impact being more pronounced in these closed work environments. This review scrutinizes DPM’s hazard in the mining sector, consolidating the extant knowledge and exploring ongoing research. It encapsulates our understanding of DPM’s physicochemical properties, existing sampling methods, health ramifications, and mitigation technologies. Moreover, it underscores the necessity for further study in areas such as the evolution of DPM’s physicochemical attributes, from its genesis at high-pressure, high-temperature conditions within diesel engines to its emission into the mine atmosphere. A key research gap is the intricate interaction of DPM with specific characteristics of the mine environment—such as relative humidity, ambient temperature, the presence of other mineral dust, and the dynamics of ventilation air. These factors can significantly alter the physicochemical profile of DPM, influencing both its in-mine transport and its deposition behavior. Consequently, this can affect the respiratory health of miners, modifying the toxicity and the respiratory deposition of DPM particles. Identified research imperatives include (1) the advancement of instrumentation for accurate number measurement of DPM to replace or supplement traditional gravimetric methods; (2) the development of long-lasting, cost-effective control technologies tailored for the mining industry; (3) an in-depth investigation of DPM interactions within the unique mine microclimate, considering the critical components like humidity and other aerosols; and (4) understanding the differential impact of DPM in mining compared to other industries, informing the creation of mining-specific health and safety protocols. This review’s findings underscore the urgency to enhance emission control and exposure prevention strategies, paving the way for a healthier underground mining work environment.

show abstract

Effects of exhaust gas recirculation composition and temperature on microscopic mechanical properties of particles in a diesel engine

Cited by 4 publications

References 26 publications

Correlation analysis of mechanical and state characteristics of diesel engine exhaust particles

Correlation analysis of mechanical and state characteristics of diesel engine exhaust particles

Synergistic Lubrication Mechanism of Nano-Fluid and Grinding Wheel Prepared by CNTs@T304 Nano-Capsules

Assessing the hazard of diesel particulate matter (DPM) in the mining industry: A review of the current state of knowledge

Contact Info

Product

Resources

About