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DEVELOPMENT OF NANOMETER-SCALED PHENOMENA TO MACROSCOPIC ENERGY CONVERSION SYSTEMS
Katsunori Hanamura 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.4
Nanometer-scaled Thermal Engineering was developed for proposing new energy conversion systems and for improving performance of the conventional systems. Here, a thermophotovoltaic generation system using near-field radiation transfer, an isotope quenching analysis for SOFCs and time-lapse SEM visualization of nanometer-scaled particulate trapping were introduced and discussed.
Saenkhumvong Eakkawut,Karin Preechar,Charoenphonphanich Chinda,Vittayakorn Naratip,Hanamura Katsunori 한국자동차공학회 2020 International journal of automotive technology Vol.21 No.6
This paper investigates the oxidation kinetics of carbon black on acicular mullite using thermogravimetric (TGA) and mullite microstructures by scanning electron microscopy (SEM) for the development of diesel particulate filters (DPFs). It is observed that the amount of each chemical composition strongly affects the structure of mullite. The addition of AlF3 and V2O5 to mullite promotes the growth of needle-shaped mullite crystals. Thermogravimetric analysis was used to investigate and characterize chemical kinetics of soot oxidation for better understanding of designs and configurations of diesel particulate filters. The mass conversion of soot on the acicular mullite (ACM) is oxidized faster than that on the mullite (ML) membrane at all temperatures examined. The calculation of apparent activation energy (Ea) of soot oxidation with isothermal methods on mullite was presented. The results showed that activation energy of soot oxidation is enhanced with ACM than with ML at all temperatures examined. The average calculated apparent activation energy of soot oxidation on ACM and ML are 146.4 kJ/mole and 155.3 kJ/mole, respectively.
EFFECT OF SOOT PARTICLE SIZE ON FOUR BALL METALLIC WEAR USING ELECTRON MICROSCOPY IMAGE ANALYSIS
Preechar Karin,Warawut Amornprapa,Park Watanawongskorn,Eakkawut Saenkhumvong,Chinda Charoenphonphanich,Katsunori Hanamura 한국자동차공학회 2020 International journal of automotive technology Vol.21 No.3
The impact of soot primary nanoparticles affecting metal wear was investigated. The commercial Carbon Black (CB) with different primary particle sizes were mixed with the engine oil for simulating soot contamination. The physical properties of carbon black including density and hardness were calculated using Transmission Electron Microscopy (TEM) image analysis. The metallic wear test was evaluated by using a Four-ball wear tester. After the tests, the ball surfaces were inspected by utilizing High-Resolution Optical Microscope (OM), Scanning Electron Microscope (SEM) and Energy Dispersive X-ray spectroscopy (EDX) analysis. Based on a Four-ball wear test, the 1 % by weight of carbon black contamination shows a bit higher average wear scar diameter (WSD), but the surface roughness is reduced. SEM micrograph of metallic wear scar for the engine oil without soot shows the area of grooves, plastic deformation and subsurface crack. On the other hand, when carbon black is added to the oil, it can be seen that there are many deep grooves along with the sliding direction. The relationship of calculated oil film thickness, primary nanoparticle size distribution, carbon atom density of soot and hardness is clearly explained metallic wear mechanisms.