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  • 1
    Electronic Resource
    Electronic Resource
    The Effect of the Heat Flux and Temperature on Thermal Strain of Aluminum Alloy Casting Mold (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 26-28 (Oct. 2007), p. 1049-1052 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this study, numerical analysis applying the finite element method (FEM) was used toinvestigate the effect of heat flux and temperature on thermal strain of aluminum alloy casting mold.For numerical analysis, analysis model was considered the effect of shrinkage, rapid temperaturevariation on the casting mold and was applied the temperature calibration to reduce the deformationand stress by temperature difference of inside and outside the mold during the cooling process. Indetail, temperature, deformation and stress distributions occurred inside of casting mold predicted bynumerical method and then investigated the correlations between the heat flux and temperaturevariation during the cooling process. As a result, aluminum alloy casting mold is occurreddeformation and stress because of rapid temperature difference in the initial of cooling, but it can bereduced the thermal strain through the heat flux control and temperature calibration. Accordingly, thetechnique of this numerical study will be helped to make the effective and the good quality of castingmold products
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.26-28.1049.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Numerical Simulation on Thermal Strain Characteristics of Casting Mold for AutomobileTire (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 345-346 (Aug. 2007), p. 893-896 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In the present study, aluminum alloy casting mold which consist of eight pieces isintroduced as a new technique of tire manufacturing. For the numerical analysis, finite elementmethod (FEM) was used to investigate the thermal strain of casting mold using aluminum alloyduring the cooling process. In the concrete, the temperature distributions on the inside of each castingmold, the displacement and stress occurred by temperature variations are investigated to predict theaccurate measurement variations of casting mold during the cooling process. In the end, numericalsimulation results such as temperature distributions, displacement and stress are presented to help tomake the effective and the best mold products. Moreover, the introduced technique of numericalsimulation applying a FEM is very useful and important things in the mechanical behavior ofmaterials, especially needs the accuracy improvement such as aluminum alloy casting mold products
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.345-346.893.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    A Study on Melting Phenomena and Enhanced Heat Transfer of Phase Change Material byUltrasonic Vibrations (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 345-346 (Aug. 2007), p. 889-892 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This study focused on observing the melting phenomena and investigated a principlefactor of enhanced heat transfer in phase change material when the ultrasonic vibrations wereapplied during the melting process. For visualization, particle image velocimetry and thermal-visioncamera for observing the flow phenomenon was used. Also, experiments were performed to obtainthe experimental results such as melting time and temperature distribution. Besides, structuralvibration simulator which is applying a coupled finite element-boundary element method (CoupledFE-BEM) was used for calculation of acoustic pressure occurred by ultrasonic vibrations in liquidregion. The results of experimental and numerical observations show that acoustic streaminginduced by ultrasonic vibrations is one of the prime effects acoustically enhanced phase change heattransfer and help to accelerate the melting of phase change material. Also, the application techniqueof visualization and computational simulation introduced in this study is very useful and importantto analyze the mechanical behavior of material in a fast fluid dynamic or acoustic field
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.345-346.889.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Analysis on the Temperature Distribution of Tread Part in Running Tire (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 261-263 (Apr. 2004), p. 1683-1688 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Tires are the only means for connecting a vehicle to the ground. The forces such as driving force, braking force, rotation force and the like occur on the contact surface between the tire and the ground and thus determine the motion of the vehicle. A general tire generates separation that continues to repeat tension and compression by the load of the vehicle. The separation raises the temperature of the tire, resulting in loosening between tire members and in the end damages the tire. Since a tire has a composite structure, which consists of rubber and reinforcements, many problems arise in the analysis of the tire. In this study, a tire of a composite structure was analyzed for heat transfer under the same condition as in the running state, so as to examine temperature distribution at tread. Theoretical results were verified using a thermal vision camera a non-contact non-destructive temperature measurement instrument
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/47/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.261-263.1683.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Study on Three-Dimensional Thermal Deformation of Aluminum Casting Tire Mold by Numerical Analysis and Experiment (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 1043-1046 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper investigates on three-dimensional thermal deformation of aluminum casting tiremold applying metal casting method by numerical analysis and experiment. In this study, thenumerical analysis was performed based on finite element method (FEM) in order to predict thermaldeformation in tread part of tire mold by completely cooling about 50°C. For the numerical analysis,“COMSOL Multiphysics 3.3 Ver.” a commercial program for heat transfer and thermal-structuralanalysis, was used. In order to verify the results calculated by the numerical analysis, the experimentwas carried out applying metal casting method on the same condition of numerical analysis. For theexperiment, the temperature profile inside the aluminum casting tire mold was measured usingthermocouples by completely cooling. When the temperature profile calculated by the numericalanalysis and measured by the experiment were compared with each other, it appeared that was a slighttemperature difference between the two results by latent heat of aluminum alloy, but their coolingpatterns were almost similar
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.1043.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    A Study on Improvement Capture Velocity for Increasing Inhalation Efficiency of Hood in Local Ventilation System (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 1039-1042 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This study was numerically and experimentally investigated on improvement capturevelocity for increasing inhalation efficiency of hood in local ventilation system. The inhalationefficiency of hood was studied to improve by increasing inhalation force of the hood that attached thenew device named “Gas-Guide-Device (GGD)”. Also, harmful material that couldn’t inhale in hoodwas removed by increasing capture velocity at the edge of hood. For the numerical study,computational fluid dynamic (CFD) was used to predict the improvement of flow velocity withattached GGD in hood. To verify the numerical result, the flow velocity was experimentally measuredusing a hot-wire type anemometer. As a result of the numerical and experimental study for improvingthe effect of the GGD on the inhalation efficiency of the hood, it was verified that the capture velocityaround the hood inlet was relatively higher for the hood with the GGD than for the one without it
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.1039.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    A Numerical Study on Thermal Strain Control of Aluminum Alloy Mold for Tire Manufacturing (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 1087-1090 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In the present study, numerical work applying a finite element method (FEM) is used toanalyze the characteristics of aluminum (Al) alloy mold for thermal strain control. In the concrete, thetemperature distribution on the inside of Al alloy mold, the contraction rate and stress occurred bytemperature variations are investigated to predict the accurate measurement variation of Al alloy moldduring the cooling process. In addition, the numerical result of the Al alloy mold were compared withthose of mild steel mold in order to obtain the improvement and good quality of mold. In the end, thenumerical results such as temperature distributions, contraction rate and stress are presented to help tomake the effective and the best mold products. Besides, the introduced technique of numericalanalysis applying a FEM is very useful and important things in the fracture and damage mechanics,especially needs the accuracy improvement such as Al alloy mold products
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.1087.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Experimental and Numerical Study on the Melting Acceleration of Phase Change Material by Ultrasonic Vibrations (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 1075-1078 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The present study was investigated on the melting phenomena and the accelerative factorsof phase change material (PCM) by acoustic streaming induced ultrasonic vibrations. To investigatethe melting phenomena and accelerative factors, the experimental study was measured the liquidtemperature and melting time of PCM and was observed the velocity vectors and thermal fluid flowinduced acoustic streaming to investigate the heat transfer using particle image velocimetry (PIV) andinfrared thermo vision camera, respectively. Also, the numerical study based on a coupled finiteelement-boundary element method (Coupled FE-BEM) was performed to investigate the analysis ofpressure field in the PCM. The results of experimental works revealed that acoustic streamingobserved by PIV and infrared thermo vision camera is one of the prime effects accelerating phasechange heat transfer. And, the final temperature of PCM is lower and melting speed is 2.6 times fasterthan that without ultrasonic vibrations when ultrasonic vibrations are applied. The results ofnumerical work presented that acoustic pressure is higher near the ultrasonic transducer than otherpoints where no ultrasonic transducer was installed and develops more intensive flow such as acousticstreaming, destroying the flow instability. Moreover, the profile of acoustic pressure variation isconsistent with that of enhancement of heat transfer
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.1075.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Experimental and Numerical Study on Enhanced Heat Transfer of Solid-Liquid PCM by Ultrasonic Wave (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 1145-1148 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The present study is investigated the causes of enhanced heat transfer during the meltingprocess of solid-liquid PCM (Phase Change Material) using an ultrasonic vibration. Paraffin (noctadecane)was selected as a PCM and experimental studies were performed as following. Heattransfer coefficient and enhancement ratio of heat transfer was measured, acoustic streaminginduced by ultrasonic waves observed using a PIV (Particle Image Velocimetry) and thermallyoscillating flow phenomenon observed using an infrared thermal camera during the melting process.For the numerical study, a coupled FE-BEM (Finite Element-Boundary Element Method) wasapplied to investigate acoustic pressure occurred by acoustic streaming in a medium. And then, theprofiles of pressure variation compared with the enhancement ratio of heat transfer. The results ofthis study revealed that ultrasonic vibrations accompanied the effects like acoustic streaming andthermally oscillating flow. Such effects are a prime mechanism in the overall melting process whenultrasonic vibrations are applied. Also, as the acoustic pressure occurred by acoustic streamingincreases, the higher enhancement ratio of heat transfer is obtained
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.1145.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    A Study on Boiling Heat Transfer Augmentation of Heating Process Using Ultrasonic Vibrations (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 544-545 (May 2007), p. 179-182 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The present study was experimentally investigated the effect of ultrasonic vibrations onboiling heat transfer augmentation during the heating process. The experiments were carried outunder the constant wall temperature condition and were divided into two cases applying with andwithout ultrasonic vibrations, respectively. Also, the temperature distributions in a vessel filled withwater were measured using thermocouples during the heating process, heat transfer coefficient andaugmentation ratio of heat transfer on states of convection, subcooled boiling and saturated boilingwere calculated from obtained temperature profiles. In addition, the profiles of pressure variationsmeasured using a hydrophone were compared with the augmentation ratio of heat transfer in acousticfields. The results of experimental study were revealed that general profiles of heat transfercoefficient and augmentation ratio of heat transfer is more increased the convection state than theothers states. Moreover, the profiles of acoustic pressure is relatively higher near ultrasonic transducerthan other points where is no installed it and affects the augmentation ratio of heat transfer. In the end,as well as known “acoustic streaming” induced by ultrasonic vibrations is one of the prime effectsacoustically augmented boiling heat transfer or phase change heat transfer
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.544-545.179.pdf
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