Karin, Preechar

Preferred name

Karin, Preechar

Alternative Name

Karin, P.

Karin, Preecha

Main Affiliation

School of Engineering

preechar.ka@kmitl.ac.th

Now showing 1 - 10 of 29

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Comparison study on fuel properties of biodiesel from jatropha, palm and petroleum based diesel fuel
(2014-01-01)
Borhanipour, Morteza
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Karin, Preechar
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Tongroon, Manida
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Chollacoop, Nuwong
;
Hanamura, Katsunori
The increase of air pollution and global warming is a threat for human life. Besides, the price of petroleum is increasing rapidly and the resources are diminishing. This obliged scientists and engineers to look for alternative sources of energy, which are cleaner and more sustainable. Biodiesel, defined as mono-alkyls of esters from vegetable oils and animals fat, is a cleaner renewable fuel and has been considered as the best alternative for petroleum based diesel fuel hence it can be used in any compression ignition engines without any significant modification. The main advantages of using biodiesel are its renewability and better quality of exhaust gas emissions due to their higher content of oxygen. The produce less soot and hence the feed stuck is plant it will regenerate the CO2 by the photosynthesis which ensures the renewability and reduces global warming. But these alternative fuels have faced some obstacles while utilizing in CI engines which are due to some of their physical and chemical characteristics. At this study the fuel properties of jatropha biodiesel and its blends (a non-edible feedstock) were compared with the properties of Palm biodiesel (an edible feedstock) and petroleum based diesel. The viscosity, density, oxidation stability, acid value, water content, iodine value, flash point, pour point, cloud point and calorific value of the samples were analyzed an discussed. The physical properties of the biodiesels are controlled by their chemical properties such as unsaturation level of fatty acids and oxidation stability. Results show that the viscosity of jatropha is higher than palm biodiesel although the density of palm biodiesel is higher. Oxidation stability of the biodiesel has impact on several chemical and physical properties and improvement of oxidation stability can make betterment in these properties. The results of this study will be used as a data backup for another research project. Copyright © 2014 SAE International and Copyright © 2014 TSAE.
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Characterization of carbon fiber and glass fiber's micro and nanostructure using electron microscopy, raman spectroscopy and xrd analysis
(2019-03-25)
Man, Tial Cuai
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Karin, Preechar
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Ohtake, Naoto
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Aakasaka, Hiroki
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Larpsuriyakul, Patcharee
Nowadays, most manufacturers are looking for the improvement of lightweight parts and other components in the automobile field. Carbon fiber and glass fiber are the most effective materials for their requirement to reduce the weight in vehicles due to their light weight and high tensile strength. The diameter of carbon fiber is 6 μm while glass fiber diameter is 17 μm. The mechanical tensile force of carbon fiber and glass fiber are 430 N and 290 N respectively on fiber alone without matrix. Carbon fibers are gradually smaller in each filament due to tensile force. Approximately 5 mm are elongated for both carbon fiber and glass fiber in tensile test report. In current research, characteristic and tensile force of carbon fiber and glass fiber were investigated by using electron microscopy, Raman spectroscopy and XRD.
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Effect of biofuel and soot on metal wear characteristic using electron microscopy and 3D image processing
(2017-11-05)
Karin, Preechar
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Amornprapa, Warawut
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Khamsrisuk, Phiranat
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Budsayahem, Pol ake
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Chammana, Pattara
The soot contamination in used engine oils of diesel engine vehicles was about 1% by weight. The soot and metal wear particle sizes might be in the range of 0-1 µm and 1-25 µm, respectively. The characteristics of soot affecting on metal wear was investigated. Soot particle contamination in diesel engine oil was simulated using carbon black. Micro-nanostructure of soot particles were studied by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and laser diffraction spectroscopy (LDS). The metal wear behavior was studied by means of a Four-Ball tribology test with wear measured. Wear roughness in micro-scale was investigated by high resolution optical microscopy (OM), 3D rendering optical technique and SEM image processing method. It was found that the ball wear scar diameter increased proportionally to the soot primary particle size. The effect of biodiesel contamination were also increasing in wear scar diameter.
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Impact of Engine Oil Additives on Nanostructure and Oxidation Kinetics of Diesel and Synthetic Biodiesel Particulate Matters using Electron Microscopy
(2019-12-19)
Koko, Phyozin
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Karin, Preechar
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Charoenphonphanich, Chinda
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Chollacoop, Nuwong
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Hanamura, Katsunori
Physicochemical characteristics of particulate matters which are influenced by engine oil additives from engine combustion of diesel and synthetic biodiesel: Hydrotreated vegetable oil (HVO) were successfully investigated using electron microscopy, electron dispersive X-ray spectroscopy and thermogravimetric analysis. The agglomerate structure of diesel PM, HVO PM and diesel blending lubricant PM are similar in micro-scales. However, nanostructure of soot is a spherical shape composed of curve line crystallites while the metal oxide ash nanostructure is composed of parallel straight line hatch patterns. The oxidation kinetics of fuel blending lubricant PMs are higher than neat fuel PMs due to catalytic effect of incombustible metal additives from engine lubricating oil.
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Physical characterization of biodiesel particle emission by electron microscopy
(2013-01-01)
Karin, Preechar
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Songsaengchan, Yutthana
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Laosuwan, Songtam
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Charoenphonphanich, Chinda
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Chollacoop, Nuwong
Nanostructures of diesel and biodiesel engine particulate matters (PMs) were investigated by using a Transmission Electron Microscopy (TEM). The average single particle sizes of biodiesel and diesel PMs are approximately 30-40 nm and 50-60 nm, respectively. Image processing process was used to estimate each carbon platelet length by using TEM image. The average carbon platelet length of biodiesel and diesel PMs are in the range of 0.1-7.0 nm. Moreover, carbon atoms per cubic volume of PMs are approximately 500-900. The result shows that engine load and fuel property are strongly impact on the size of single particle and carbon atom density of particle. This is one of interesting behaviors need to be investigated for better understanding. The results of this research would be used as basic information for design and develop removing process of PM emitted from engine combustion which using in diesel and biodiesel fuels. © Copyright @2013 SAE Japan and Copyright @ 2013 SAE International.
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Impact of engine oil's additives on particulate matter's micro-and nanostructure using electron microscopy image analysis
(2019-01-01)
Koko, Phyozin
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Karin, Preechar
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Rungsritanapaisan, Sippakorn
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Tongsri, Ruangdaj
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Hanamura, Katsunori
According to increasingly stringent emission regulations on particle emissions from automotive vehicles, a diesel engine must be equipped with diesel particulate filter (DPF) to trap the particulate matters (PMs) which can be harmful to human health. Morphology and chemical composition of particulate matters were successfully studied using electron microscopy and electron dispersive x-ray spectroscopy (EDS) analysis. Microstructure of particulate matters derived from diesel blending lubricating oil were not significant different compared to diesel PM. Nanostructure of soot is a spherical shape composed of curve line crystallites and the particle sizes were in the range of 10 -60 nm while the metal oxide ash is composed of lattice fringes. Chemical composition analysis of EDS result showed that metallic additives from lubricating oil cannot be burned during combustion and might be transformed into metal oxide ash.
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Influence of ethanol biodiesel blends on a diesel engine's efficiency and exhaust emission characteristics
(2022-01-01)
Kanokkhanarat, Phobkrit
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Karin, Preechar
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Depaiwa, Nattawoot
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Wongpattharaworakul, Veerayut
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Srisurangkul, Chadchai
The harm caused by polluted air occurs from dust, smoke, or soot. One of the main causes of pollutions is exhaust emission that comes from diesel engines of cars, trucks, buses, heavy machines, or generators for industrial because their thermal efficiency, torque, and performance are higher than the other engines. To reduce the emission from diesel engines, the fuel substitute for biodiesel which is made from based palm oil is one of the alternatives to use. So, the purpose of this paper is an experimental investigation of the engine performance, combustion characteristics, and smoke intensity of commercial biodiesel fuels (B10 and B20), pure biodiesel fuel (B100), and pure biodiesel blended with ethanol fuels (B100E5 and B100E10), which were performed at various loads (56, 84, 112, and 140Nm) and conducted at constant engine speeds (1000, 1500, and 2000 rpm). The experimental results show that pure biodiesel fuel (B100) and pure biodiesel blended with ethanol fuels (B100E5 and B100E10) have engine performance and combustion characteristics similar to commercial biodiesel fuels (B10 and B20). However, pure biodiesel fuels (B100) and pure biodiesel blended with ethanol fuels (B100E5 and B100E10) can reduce the emissions as the smoke intensity from commercial biodiesel (B10 and B20) is more than 50%.
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Experimental investigation of the impact ethanol-biodiesel-diesel blended fuels on combustion, emission, and performance of compression ignition diesel engine
(2022-01-01)
Wai, P.
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Karin, P.
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Phairote, W.
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Chollacoop, N.
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Kosaka, H.
This research was directed to reduce the global diesel engine emissions and dependency on finite fossil fuel reserves. The ethanol was blended by weight ratio with commercial “B20” fuel (20% palm oil's biodiesel and 80% diesel) as B20E5 (95% B20 with 5% ethanol), B20E10 (90% B20 with 10% ethanol) and B20E20 (80% B20 with 20% ethanol). The results of the engine's performance, combustion, emission, and agglomerate particles size using blended fuels were compared with the results of based commercial B20 fuel. All fuel samples were tested on a four-cylinder direct injection diesel engine at a constant load of 140Nm with engine speeds of 1000RPM, 1500RPM and 2000RPM. When the engine speed increased, the brake-specific fuel consumption decreased, and the brake thermal efficiency increased. The B20E20 shows the highest brake-specific fuel consumption because of the low energy content of the fuel blend and the highest thermal efficiency because of a better combustion process. The ethanol-blended fuels show higher peaks of in-cylinder pressure and heat release rate than the base B20 fuel, with B20E20 as the highest. Ethanol blended fuels have significant advantages in particulate matters reduction, especially in idle engine speed. The blended fuels decreased soot and CO<inf>2</inf> emissions and increased NO<inf>x</inf> emission. The agglomerate particles size distribution was analysed with 100 samples for each fuel by using Scanning Electron Microscopy (SEM) and Image J tools. The average agglomerate particle size of B20, B20E5, B20E10 and B20E20 are 0.253 µm, 0.245 µm, 0.225 µm and 0.187 µm, respectively. As conclusion, adding ethanol to diesel fuel provide strong advantages on soot reduction and higher engine efficiency due to the enrich of fuel oxygen.
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Battery sizing for electric vehicles based on real driving pattern in Thailand
(2018-01-01)
Duangsrikaew, B.
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Mongkoltanatas, J.
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Karin, P.
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Hanamura, K.
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Benyajati, C.
The purpose of this study was to carry out a battery sizing based on the fulfilment of power requirement from the representative real driving pattern in Thailand. The real driving cycle data i.e. velocity and vehicle global position were collected through a GPS-based equipment, VBOX. The driving data transportation services provided in a campus of university based in the rural area of Bangkok were collected from three different types of i.e. closed-area, inter-city and local feed. Three campus driving data types were gathered to achieve a suitable dimensioning of battery systems for electrified university public buses.
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Spray visualization of biodiesel and diesel in a high pressure chamber
(2014-01-01)
Srichai, Prathan
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Chareonphonphanich, Chinda
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Karin, Preechar
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Chollacoop, Nuwong
The present research attempted to characterize fuel spray pattern, such as spray angle, spray penetration and their mixture formation by recourse to images analysis. Diesel and biodiesel were used to investigate via a single hole injector (solinoild type) in a constant volume high-pressure chamber. In this experimental study, the spray characteristics of diesel and biodiesel fuel were comparatively evaluated. Initial conditions were ambient temperature, ambient density of 21 kg/m<sup>3</sup>, injection durations varied from 0.5 and 1 ms and rail pressure of 400 and 800 bar. The series of images were captured by high speed video camera with resolution of 7,500 frames per second and shutter speed of 1/10,000 sec under Schlieren photography technique. The result showed the biodiesel spray penetration was longer than that of the diesel, and spray angle of biodiesel in start injection was larger than biodiesel. From the results, it can be concluded that the higher the density and viscosity of biodiesel, the stronger the effect on the spray mixture formation. © (2014) Trans Tech Publications, Switzerland.

Karin, Preechar

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