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Thermal Fluid Flow Transport Characteristics in Confined Channels with Two Dimensional Dual Jet Impingement

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材料科学与工程（中英文A版） 2011年第5X期1卷 648-657页

作者： Senkal Caner shuichi torii Graduate School of Science and Technology Mechanical System Engineering Kumamoto University Kumamoto City 860-0862Japan

The flow and heat transfer characteristics of laminar dual circular jet impinging on a heating plate with inclined confinement surface has been investigated numerically. Governing equations in steady state are solved by a control volume based finite-difference method. The simulations have been carried out for Reynolds number (250 ≤ Re ≤ 418), the angle of inclination of the confined upper wall (0 ≤ θ ≤ 10), circular jet to annular jet velocity ratio (0 ≤ VR ≤ 2) and jet to target plate distances between 2D and 8D where D is the outer diameter of dual jet. SIMPLE algorithm was used to obtain velocity and temperature fields. Hybrid difference scheme is adopted for the discretized terms in the governing equations. The discretised equations are solved iteratively using the tridiagonal matrix algorithm line solver. Heat transfer performance along the heated wall is amplified with an increase in the velocity ratio and the Reynolds number. On the contrary, a substantial reduction in the heat transfer rate, for VR = 0.0, occurs in the stagnation zone, because the absence of the inner nozzle injection causes the recirculation in the corresponding region. The heat transfer rate in the stagnation zone is attenuated by increasing the jet nozzle to impinging plate distance. In particular, the effect of the inclination angle in the down-stream region, especially at the vicinity of outlet, is major then other effects Nusselt number distribution on the impingement plate is affected by inclined upper wall because inclination of the wall accelerates the exhaust flow. The streamwise reduction in the heat transfer rate for θ=0? is suppressed by the presence of the inclined confinement surface and its value is intensified by the inclination angle.

关键词：传输特性射流冲击密闭热流体通道二维状态方程射流速度

Characterized the Microalgae （Chlorella and Spirulina） and Macro Algae by Using TGA and Bomb Calorific Meter for the Biomass Energy Application

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Journal of Mechanics Engineering and Automation 2015年第12期5卷 691-696页

作者： An-Peng Chen shuichi torii Graduate School of Science and Technology Kumamoto University Kumamoto 860-8555 Japan Department of Advanced Mechanical Systems Kumamoto University Kumamoto 860-8555 Japan

Biomass usually is noticed a composition of various types of waste materials that can be utilized as useful form of energy alternative to the conventional fossil fuels. However, this new kind of energy has not met its full potential in production of energy, especially electricity generation due to its lower performance in terms of thermal efficiency. Algae （included Microalgae ＆ Macroalgae） are widely used for multi-application developments such as fishery aquaculture, food/nutrient supplement, cosmetics, and biomass energy. Microalgae have been treated as the source of bio-fuel. In this paper, we selected the two types of freshwater microalgae ＂Chlorella Vulgaris＂＆＂Spirulina＂ and macro algae （Laminariaceae） as the main materials and we analyzed TGA （thermal gravity analysis） and calorific values （heat of combustion）. We found the calorific values are 1,000-5,000 KC/KG and TGA results show that the microalgae decrease rapidly after reached 300 ℃. The results in this paper will be used as a reference material for microalgae multi-oriental energy application and biomass composition proximate and ultimate research development in the future.

关键词： Biomass energy microalgae TGA (thermal gravity analysis) combustion.

Fluid Flow Characteristics in Micro-Pump with the Aid of Peltier Devices and Thermal Expansion Material

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Journal of Energy and Power Engineering 2016年第2期10卷 93-101页

作者： shuichi torii Yasuhiro Takakura Graduate School of Science and Technology Kumamoto University Kumamoto 860-8555 Japan

Experimental study is performed to design and develop a cylindrical micro-pump driven by expansion and contraction of the heat deformation material, whose variation is caused with the aid of heating and cooling properties of Peltier devices. The pump consists of the diffuser valve unit, the heat deformation material unit, the nozzle valve unit, the Peltier devices and the cover. The input current of the Peltier devices is controlled by the bipolar power supply so that the Peltier devices are heated and cooled periodically. The working fluid flow in the micro-pump is caused by the periodical thermal deformation of material which is caused by the periodical heating and cooling of the Peltier devices. In order to measure the fluid flow in the micro-pump, micro air bubbles are employed as a tracer. The corresponding movement is recorded by X-ray apparatus and its velocity is measured by PIV （particle image velocimetry）. It is found that, the micro-pump developed here can make the working fluid flow. The corresponding fluid flow in the micro pump is confirmed by the numerical method.

关键词： Flow visualization micropump Peltier device X-ray.

Thermal Fluid Flow Transport Phenomenon over Twin Diamond-Shaped Column in Free Stream

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材料科学与工程（中英文B版） 2011年第5期1卷 682-688页

作者： shuichi torii Zijie Lin Department of Mechanical System Engineering Kumamoto University Kumamoto 860-8555 Japan

Numerical and experimental study is performed on unsteady laminar fluid flow transport phenomena around a pair of heated diamond-shaped cylinders in free stream. Emphasis is placed on the effects of the Reynolds number, Re, and the ratio of cylinder separation distance (s) to length (d) of diamond-shaped cylinder, s/d, on the flow patterns and thermal fields in side-by-side arrangements. It is found that: (1) the generation of von Karman vortex streets behind the diamond-shaped cylinders are intensified with an increase in the Reynolds number; (2) the flow pattern in the wake region of the diamond-shaped islands is affected by s/d; (3) the corresponding flow map is obtained in the form of the Reynolds number versus s/d; (4) the vortex shedding frequency depends slightly on the gap spacing; and (5) the vortex appears in the downstream direction and in contrast the corresponding thermal diffusion occurs in the vicinity of the diamond cylinders.

关键词：自由流菱形热流体运输流动模式雷诺数数值模拟传输现象

Experimental Study on Combustion Characteristics of Unused Biomasses in Compact Combustor

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Journal of Energy and Power Engineering 2018年第4期12卷 211-221页

作者： Chong Liu shuichi torii Department of Mechanical System Engineering Kumamoto UniversitvKurokami2-39-1Kumamoto 860-8555Japan

The aim of the present study is to develop the biomass furnace combustor which can effectively employ four unused biomasses, i.e., wood bark, wood branch, bamboo, and grass as a fuel. Emphasis is placed on the combustion gas components and combustion gas temperature in the combustor. It is found from the study that：（1） Four unused biomasses can take plate self combustion and the stable combustion yield; （2） Different combustion temperature distribution appears in combustor and is affected by each biomass; （3） The concentrations of nitrogen oxide and sulfur oxides are lower than the discharge standard value; （4） Higher thermal efficiency yields for bark, bamboo and grass.

关键词： Unused biomass compact combustor stable combustion combustion analysis and thermal efficiency.

Flip-Flop Flow Control inside Streamwise Diverging Diamond-Shaped Cylinder Bundles with Concavities

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Journal of Flow Control, Measurement & Visualization 2013年第3期1卷 77-85页

作者： shuichi torii Shizaburo Umeda Department of Architecture and Civil Engineering Fukuyama University Fukuyama Japan Department of Mechanical System Engineering Kumamoto University Kumamoto Japan

The flow visualization work with the aid of PIV and Piezometer deals with flip-flop flow around diamond-shaped cylinder bundle revised with concavities on both bundle walls. It is disclosed that 1) the concavity constructed on both side-walls of a diamond cylinder induces a substantial change in the flow patterns in the exit jet-stream field and jet- stream dispersion, 2) pressure characteristics are quantitatively measured in a diverging-flow region in diamond cylinder bundles with concavityand in its downstream region, and 3) flip-flop flow occurs in the flow passages and its occurrence condition is obtained.

关键词： Flip-Flop Flow Streamwise Diverging Diamond-Shaped Cylinder Bundle PIV Measurement Concavity

Experimental Study of Filling Ratio Effect on the Thermal Performance in a Multi-Heat Pipe with Graphene Oxide/Water Nanofluids

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World Journal of Nano Science and Engineering 2016年第4期6卷 153-164页

作者： Mohamed Salem Tarek A. Meakhail Magdy A. Bassily shuichi torii Department of Mechanical Engineering Faculty of Energy Engineering Aswan University Aswan Egypt Graduate School of Science and Technology Kumamoto University Kumamoto Japan Department of Mechanical Engineering Faculty of Engineering Minia University Minia Egypt

This experimental study is performed to investigate heat transfer performance of a multi-heat pipe cooling device in the condition of different filling ratios (40%, 60%, 80% and 100%) and different constant heat fluxes (10 - 30 W). Here, pure water (distilled water) and graphene oxide (GO)/water nanofluids are employed respectively as working fluid. GO/water nanofluids were synthesized by the modified Hummers method with 0.05%, 0.10%, 0.15%, and 0.20% volume concentrations. Multi-heat pipe is fabricated from copper;the heating and cooling sections are the same size and both are connected by four circular parallel tubes. Temperature fields and thermal resistance are measured for different filling ratio, heat fluxes and volume concentrations. The results indicated that the thermal performance of heat pipe increased with increasing the concentration of GO nanoparticles in the base fluid, while the maximum heat transfer enhancement was observed at 0.20% volume concentration. GO/water nanofluids showed lower thermal resistance compared to pure water;the optimal thermal resistance was obtained at 100% filling charge ratio with 0.20% volume concentration. Studies were also demonstrated that heat transfer coefficient of the heat pipe significantly increases with increasing the input heat flux and GO nanoparticles concentration.

关键词： Multi-Heat Pipe Graphene Oxide Filling Ratio Volume Fraction Thermal Resistance

Production and Characterization of Biodiesel from Rapeseed Oil through Optimization of Transesterification Reaction Conditions

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Journal of Energy and Power Engineering 2019年第10期13卷 380-392页

作者： Momar Talla Dieng Takumi Iwanaga Yokoyama Christie Yurie shuichi torii Department of Advance Mechanical System Engineering Kumamoto UniversityKurokami2-39-1Kumamoto 860-8555Japan Laboratoire de Photonique Quantique d’Energie et de NanoFabrication Facultédes Sciences et TechniquesUniversitéCheikh Anta Diop de Dakar(UCAD)Dakar-Fann DakarB.P.5005Sénégal

In this study,biodiesel fuel was produced from rapeseed oil via transesterification *** optimum reaction conditions were determined by varying alcohol type and its concentration considering their influence on the yield and properties of produced *** and ethanol were alcohol used in the transesterification *** density of biodiesel was measured at 15℃according to EN ISO 12185 test method and its viscosity was determined at 40℃by using a Brookfield digital viscometer(DV-II+Pro).Shimadzu Auto-Calculating Bomb calorimeter CA-4AJ was used to measure the high heating *** optimum transesterification conditions found were alcohol:oil ratio of 18:1,1%of potassium hydroxide as catalyst,60 min of reaction time,60℃of reaction temperature and stirring speed of 650 *** properties under these conditions satisfied the regulatory standards and are slightly similar to those of mineral diesel tested in same *** methanol gives better results compared to ethanol.

关键词： Biodiesel transesterification reaction optimization process rapeseed oil.

Production of Biomethane from Cafeteria,Vegetable and Fruit Wastes by Anaerobic Co-Digestion Process

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Production of Biomethane from Cafeteria,Vegetable and Fruit ...