检索结果-南通市图书馆

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

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

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

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

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

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

Heat Transfer Performance of a Multi-heat Pipe Using Graphene Oxide/Water Nanofluid

作者： Muhammad Rashed Al Mamun shuichi torii Department of advanced Mechanical System Engineering Graduate school of Science and TechnologyKumamoto University

Alleviate energy crisis and global climate change,the world is need of a green,efficient,carbon-neutral renewable energy source to replace fossil fuels. This study was designed to determine the optimal mixing ratio of cafeteria,vegetable and fruit wastes in biogas production and methane yields using batch anaerobic digesters at mesophilic(25 to 34℃) temperature. The mixing ratio used were CW:VW:FW(0.5:1.0:1.5,1.0:1.5:0.5,1.5:0.5:1.0 and 1.0:1.0:1.0) for cafeteria waste(CW),vegetable waste(VW) and fruit waste(FW) respectively. The fermentation was carried out in 200 L polypropylene digesters. The results showed that the codigestion significantly affected the biogas production rate. At four mixing ratio tested,after 35 days of digestion,the biogas yield was determined to be CW:VW:FW(0.5:1.0:1.5,1.0:1.5:0.5,1.5:0.5:1.0 and 1.0:1.0:1.0) were 13.38,15.85,17.03 and 19.43 L/day,respectively. The cumulative average biogas productions from CW:VW:FW(0.5:1.0:1.5,1.0:1.5:0.5,1.5:0.5:1.0 and 1.0:1.0:1.0) were 225,279,305 and 332 L/day,respectively. The biogas yields obtained in the work for the cafeteria(CW),vegetable(VW) and fruit wastes(FW) mixture were in the order of(1.0:1.0:1.0 > 1.5:0.5:1.0 > 1.0:1.5:0.5 > 0.5:1.0:1.5). The higher methane contents and yields were obtained from the CW:VW:FW(1.0:1.0:1.0) mixture ratio than those from the CW:VW:FW(1.5:0.5:1.0,1.0:1.5:0.5,and 0.5:1.0:1.5). Thus,optimum mixing ratio suggested by the study which gave maximum yields within 35 day hydraulic retention time without inoculums added.

关键词： Anaerobic digestion biogas renewable energy cafeteria waste(CW) vegetable waste(VW) fruit waste(FW)

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Energy and Power Engineering 2017年第2期11卷 95-102页

作者： Mohamed Salem Tarek A. Meakhail Magdy A. Bassily shuichi torii Department of Mechanical Engineering Faculty of Energy Engineering Aswan University Aswan 81528 Egypt Department of Mechanical Engineering Faculty of Engineering Minia University Minia 61519 Egypt Graduate School of Science and Technology Kumamoto University Kumamoto 860-8555 Japan

Experimental Study on Combustion Characteristics of Unused Biomasses in Compact Combustor

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

作者： Chong Liu shuichi torii

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

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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