Academic literature on the topic 'Heat content; Capacity; Casting'
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Journal articles on the topic "Heat content; Capacity; Casting"
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Kolokoltsev, V. M., A. S. Savinov, and A. S. Tuboltseva. "Prediction of Temperature Fields in the System “Casting and a Damp Sandy-Argillaceous Mold”." Solid State Phenomena 284 (October 2018): 640–46. http://dx.doi.org/10.4028/www.scientific.net/ssp.284.640.
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The function of the equivalent heat capacity that takes into account the heat consumption for heating and evaporation of water in the layer of sand with initial moisture content 2 - 10% has been obtained in the work. The function found allows taking into consideration the temperature change of the specific heat capacity of silicon oxide of sandy - argillaceous molds (SAM) and can be applied in the numerical solution of the heat conduction problem by a finite difference method.
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Ramírez-López, Adán, Omar Dávila-Maldonado, Alfonso Nájera-Bastida, Rodolfo D. Morales, Jafeth Rodríguez-Ávila, and Carlos Rodrigo Muñiz-Valdés. "Analysis of Non-Symmetrical Heat Transfers during the Casting of Steel Billets and Slabs." Metals 11, no. 9 (August 31, 2021): 1380. http://dx.doi.org/10.3390/met11091380.
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The current automation of steelmaking processes is capable of complete control through programmed hardware. However, many metallurgical and operating factors, such as heat transfer control, require further studies under industrial conditions. In this context, computer simulation has become a powerful tool for reproducing the effects of industrial constraints on heat transfer. This work reports a computational model to simulate heat removal from billets’ strands in the continuous casting process. This model deals with the non-symmetric cooling conditions of a billet caster. These cooling conditions frequently occur due to plugged nozzles in the secondary cooling system (SCS). The model developed simulates the steel thermal behavior for casters with a non-symmetric distribution of the sprays in the SCS using different boundary conditions to show possible heat transfer variations. Finally, the results are compared with actual temperatures from different casters to demonstrate the predictive capacity of this algorithm’s approach.
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Krajewski, Paweł K., Grzegorz Piwowarski, and Witold K. Krajewski. "Determining Temperature Dependencies of Sand Mould Thermal Properties." Materials Science Forum 790-791 (May 2014): 452–57. http://dx.doi.org/10.4028/www.scientific.net/msf.790-791.452.
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The presented work is aimed at determining thermal diffusivity, thermal conductivity and heat capacity coefficients of silica quartz bentonite foundry sand. The values of the above thermo-physical properties were determined for temperature range of about 30 - 450 °C using theCasting measuring method[1-.The results obtained during the examinations presented in the paper can be useful when formulating boundary conditions in numerical models of heat and mass transfer in the system: casting mould ambient. TheCasting methodallows preserving real conditions during the experiment, i.e. contact of the mass with liquid metal and solidifying casting, and the obtained results are in a good agreement with the mean values available in literature. From the obtained results it follows that examinations should be also focused onthermo-physical properties vs. mass densitydependency.
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Yahaya, Bashir, E. M. Nazim, Mohd Hasbullah Idris, M. S. Dambatta, Mahmood Anwar, and Sudin Izman. "Thermal Response of Activated Charcoal Modified Investment Casting Moulds." Advanced Materials Research 1125 (October 2015): 181–85. http://dx.doi.org/10.4028/www.scientific.net/amr.1125.181.
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Direct microwave dewaxing of investment casting moulds is possible at the expense of time and poor heat distribution. Modifying the back-up stucco of investment casting moulds may enhance microwave absorption; however, it may affect its thermal properties. In this study, the effects of adding activated charcoal in the back-up stucco of the investment casting mould were investigated. Samples prepared without and with 25% activated charcoal were tested for differential scanning calorimetry (DSC) and Thermogravimetric analysis (TGA). It was observed that the specific heat capacity is higher in the samples added with activated charcoal. The DSC curves exhibit a smooth trend with no indication of exothermic or endothermic peaks in both samples. The glass transition temperature was also increased from 515.29°C to 582.24°C after modifying the contents. However, the TGA results show no significant difference in mass lost between the two samples that are about 2%. The DSC and TGA curves for both samples show similar patterns indicating that there is very close similarity in their thermal behaviour. Due to that, it can be concluded that the addition of activated charcoal in the back-up stucco does not induce an unusual reaction or thermal behaviour in the moulds.
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Suresh, R. "Development and Property Evaluation of Chilled MMC Prepared with LM25 as Matrix and SiO2 (Glass) Particulates as Dispersoids." Advanced Materials Research 1101 (April 2015): 85–88. http://dx.doi.org/10.4028/www.scientific.net/amr.1101.85.
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Main objective of the present work is to investigate the effect of dispersiod content and the effect of chill on the mechanical properties of chilled MMC with LM25 as matrix and SiO2as dispersoid. Investigation is carried out to evaluate Ultimate Tensile Strength (UTS), Fracture toughness, Hardness, and microstructure of chilled aluminum matrix and Glass particulate composite. The glass (SiO2) particles ranging from 30-to100µm were chosen as dispersiod and added, ranging from 3to 12wt% in steps of 3%. The composite was prepared by stir-casting technique and poured into the sand molds incorporated with non-metallic and metallic chills. Test result showed that this MMC was greatly influenced by the dispersiod and chills. Fracture toughness & UTS of the composite are found to depend on the wt% of the dispersiod and chilling medium. It is observed that chill has influenced hardness of the composite. Volumetric heat capacity (VHC) of the chill is found to increase the amount of heat absorbed. Microstructure analysis has reveled uniform distribution of the dispersiod, which results in improved properties of the particulate reinforced metal matrix composite.
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Lekhov, O. S., A. V. Mikhalev, and M. M. Shevelev. "Production of three-layer steel bimetallic strips in the unit of continuous casting and deformation. Report 1." Izvestiya. Ferrous Metallurgy 62, no. 8 (September 13, 2019): 594–99. http://dx.doi.org/10.17073/0368-0797-2019-8-594-599.
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High technical and economic efficiency of the use of bimetals in chemical, oil, transport and energy engineering and other industries is described. The urgency of creating high-performance continuous processes for the production of bimetallic strips is substantiated. The authors have established the main technological tasks for development of the processes of obtaining bimetal of wide class. The paper describes resource-saving production technology of three-layer bimetals alloyed steel – constructional steel – alloyed steel at the unit of combined process of continuous casting and deformation. Possibilities of the proposed technology are outlined from the standpoint of improving the quality of bimetallic strips. The initial data are given to determine the temperature change over time of the main steel strip as it passes through the molten metal of the alloyed steel. The equations are given for non-stationary heat conduction, initial and boundary conditions for determining the temperature fields of main strip and cladding layer when obtaining a three-layer bimetallic strip on the unit of a combined process of continuous casting and deformation. The values of density, thermal conductivity and heat capacity for steel St3 were determined in a given temperature range. A procedure is described for calculating temperatures in the ANSYS package by solving a non-stationary heat conduction problem in a flat formulation by the finite element method. The authors have described the geometric model for calculating the temperature of strip and molten metal of the cladding layer. Values of the coefficient of heat transfer between the main strip and molten metal of the cladding layers of bimetallic strip are given adopted for calculation. Characteristic points are indicated in the model for calculating the temperatures of main strip and molten metal of the cladding layer. The graphs show temporal changes in these temperatures at production of a three-layer bimetallic strip on the unit of combined process of continuous casting and deformation. Calculated data on the time variation of temperature of main strip and molten metal of the cladding layer at characteristic points are given for different values of the contact heat transfer coefficient.
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Neagu-Cogălniceanu, Camelia. "Technique Achievement of Glass Objects Using Kiln Casting Method." Advanced Materials Research 837 (November 2013): 61–66. http://dx.doi.org/10.4028/www.scientific.net/amr.837.61.
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In the context of the competitive actual environment, the production need to adapt to the preferences of the consumers, this represents the essential goal for all manufacturers. The production flexibility can be achieved by designing and marketing of new products or/and modify existing products in short time and at low cost. The technique presented in these article addresses of manufacturers and designers who made glass products unique or small series, adapted to consumer demands. In recent decades, digital fabrication methods are developed in various fields (aeronautics, shipbuilding, automotive, construction, architecture, industrial design and so on) and gained great popularity due to relevant advantages over the traditional production methods. Sculptural surfaces (also called free form surfaces) of the product with aestethetic requirements and/or functional role can be achieved through various technologies RP & M (Rapid Prototyping and Manufacturing). The Rapid Prototyping technologies can be grouped unto two major categories. First one refers to additive processes RP. From this point of view there are over 40 different types such as: stereo lithography (SL), Laminated Object Manufacturing (LOM), Selective Laser Sintering (SLS), 3D Printing (3DP), Solid Ground Curring (GSC) and Fused Deposition Modelling (FDM). The second one consists of subtractive Rapid Prototyping. Subtractive Rapid Prototyping (SRP) is one of the methods used for processing digital models into physical objects used for RP and for Rapid Tooling (RT). It is difficult to say what method is the best RP/RT; every one of them has advantages and disadvantages. The choice of the appropriate method depends on many factors, such as: product geometry, material type, dimensional accuracy, surface roughness on finished product, and so on. The starting point of this work consists in three photographs that are digitally processed to achieve the expansion of 2D in 3D structure. The expanded model is imported into computer-aided manufacturing (CAM) software. The parameters required to processing on Computer Numerical Control (CNC) machine are set, in order to obtain the shape of the casting mold. The schedule of heat treatment for glass is adapted according to the characterics of glass, mold material and the type of kiln. Rheological behaviour of glass has a key parameter in processing glass. The steps of kiln casting process (temperature ramps, heat treatment time) are choose at some values of viscosity (also called viscosity points ) related with glass type and size of object. The presented method can be successfully used in the manufacturing process offering to companies the possibility of increasing the capacity of new product development.
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Rejilin, D. R. Anand, R. Murugesan, and V. Bravin Ebanesh. "Flexural Performance of Geopolymer Concrete Modified with Pozzalonic Minerals and Secondary Reinforcement." Journal of Computational and Theoretical Nanoscience 15, no. 2 (February 1, 2018): 459–69. http://dx.doi.org/10.1166/jctn.2018.7110.
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Concrete, the versatile building material is relevantly used for structural applications for its ease of application and in situ adaptability. Decline of raw materials, cost and environmental issues related to unsustainable usage of cement, persuades the construction industries for an alternate binder similar to cement. Geoploymer concrete known for its eco-friendly manufacturing process and economic approach makes the, GPC a viable substitute for cement concrete. At elevated temperature, GPC undergoes polymerisation reaction and develops three dimensional amorphous components which exhibits enriched mechanical properties. To achieve the in-situ application of geoploymer concrete and to overcome the requirement of heat during polymerisation reaction, fly ash based GPC was modified with different proportions of GGBS and OPC and curing it with ambient temperature for enhancing its mechanical behaviour. Variation in temperature during the initial stages of casting process produces micro cracks which are prevented by addition of Secondary reinforcements which furthermore improved the mechanical properties. A constant percentage of GUJCON fiber as secondary reinforcement was added to all the modified proportions. The fly ash based GPC replaced with GGBS and OPC showed improved split and compressive strength at 100% and 40%. Further improvement of strength was observed with 12% replacement of GGBS with OPC to GGBS based GPC. The flexural performance of the modified GPC with optimum proportions of GGBS and OPC was compared with conventional cement concrete beam. The percentage increase in strength of GGBS based GPC with optimum OPC content when compared with conventional specimens showed 53% improvement in strength. When fibre reinforcement was added in prescribed quantity, it promoted the mechanical strength and reduced micro cracks by which the load carrying capacity was increased to 66%. The structural performance of modified GPC was found to be suitable for in situ applications in ambient curing condition.
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Hampl, M., J. Leitner, K. Růžička, M. Straka, and P. Svoboda. "Heat capacity and heat content of BiNb5O14." Journal of Thermal Analysis and Calorimetry 87, no. 2 (December 11, 2006): 553–56. http://dx.doi.org/10.1007/s10973-006-7732-x.
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Amin, M. Ruhul. "Thermal Analysis During Continuous Casting Process Using Effective Heat Capacity Method." Journal of Thermophysics and Heat Transfer 14, no. 2 (April 2000): 170–76. http://dx.doi.org/10.2514/2.6528.
Full textDissertations / Theses on the topic "Heat content; Capacity; Casting"
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Dong, Hongbiao. "A theoretical and experimental investigation of a novel scanning calorimeter." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343236.
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Ram, Gokul, and Vishnu Harikrishnan. "INFLUENCE OF CARBON CONTENT AND COOLING CONDITIONS ON THE THERMAL CONDUCTIVITY AND TENSILE STRENGTH OF HIGH SILICON LAMELLAR GRAPHITE IRON." Thesis, Tekniska Högskolan, JTH, Material och tillverkning, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-51152.
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Much study has been carried out to determine the properties of Lamellar Graphite Iron (LGI) or grey iron and their relations to factors such as the cooling rate, the dendrite morphology, the pouring temperature, and so on. However, there hasn’t been much comprehensive study on the properties of LGI outside the generally used and accepted composition, with 1 to 3% Silicon. The scope of this study is to measure and evaluate the thermal conductivity and tensile strength of LGI, for a higher concentration of Si and different carbon contents. The concentration of Si aimed for was 4% but the concentration obtained after spectroscopy was between 4.1% to 4.15%. There are two hypereutectic, one near-eutectic and three hypoeutectic samples considered and these six chemical compositions were cast under different cooling conditions . The cooling time has been varied by providing different molds of 30mm, 55mm, and 80mm diameter cylinders respectively, for all the six sample compositions. The microstructure analysis carried out studies the segregation of Si, the graphite morphology, primary austenite morphology. These factors are then compared to the thermal and tensile behavior measured in this study. It can be observed that the thermal conductivity studied in the present work has a direct correlation for a higher Si content and tends to be greater than the thermal conductivity values observed from other studies with lower content Of Si. However, the conductivity shows an inverse relation with the cooling rate and is maximum for the samples with the lowest cooling rate. The tensile strength, on the other hand, seems to have a lower value than that observed in previous studies for LGI with 1 to 3% Si, but shows a direct correlation with the cooling rate. The mean area fraction of dendrites obtained and the mean interdendritic hydraulic diameter is also measured and their influence on the properties are also studied. The addition of more Si has greatly favored the thermal behavior positively but has also reduced the tensile strength.
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Fedorko, Tomáš. "Řešení přenosu tepla tuhnoucí ocelové soustavy se změnou fáze při pohybujících se okrajových podmínkách." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-400426.
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Cílem diplomové práce je vytvoření 2D numerického modelu pohybujícího se řezu s proměnnými okrajovými podmínkami skutečné geometrie plynulého odlévání a chlazení předlitku v prostředí MATLAB. Model se zabývá vysoce nelineárními termofyzikálními podmínkami oceli během tuhnutí a chlazení. V práci je simulovaná nejen nelinearita termofyzikálních podmínek, ale také nelinearita při fázové změně. Fázová změna je modelovaná pomocí metody entalpie, metody zdánlivé kapacity a metody teplotního zotavení. Všechny výsledky práce jsou porovnány z více hledisek, jako např. z hlediska přesnosti, rychlosti výpočtu, nebo vhodnosti časového diskretizačního kroku pro nelineární problémy, a paralelizace.
Books on the topic "Heat content; Capacity; Casting"
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Hemingway, Bruce S. Revised heat capacity values for topaz and staurolite based upon a better analysis of the water content of the samples. Reston, VA: U.S. Dept. of the Interior, U.S. Geological Survey, 1995.
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S, Hemingway Bruce, and Geological Survey (U.S.), eds. Estimating heat capacity and heat content of rocks. [Reston, VA]: U.S. Geological Survey, 1995.
Find full textBook chapters on the topic "Heat content; Capacity; Casting"
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White, Mary Anne. "Heat Capacity, Heat Content, and Energy Storage." In Physical Properties of Materials, 127–71. Third edition. | Boca Raton : Taylor & Francis, CRC Press, 2019.: CRC Press, 2018. http://dx.doi.org/10.1201/9780429468261-9.
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Valdez-Rodríguez, S., B. Campillo, and J. J. Islas. "Microstructure and Microhardness of AlZnMnMg Alloy During Heat Treatment." In Encyclopedia of Aluminum and Its Alloys. Boca Raton: CRC Press, 2019. http://dx.doi.org/10.1201/9781351045636-140000189.
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In this work, the structural changes induced by the chemical nature of alloyed elements and aged treatment showed a beneficial connection with hardness and electrochemical degradation performance. Al-based alloys were investigated by means of the Vickers hardness test, in order to determine the effect of aging treatment on the hardness; X-ray diffraction and scanning electron microscopy were used to identify the phase transformation by the casting and ageing treatment; finally, a short-term electrochemical test to know the electrochemical performance. The results show that the formation of the (MgZn)49Al32 phase occurs under two conditions: when the magnesium content is more than 5.49% in as-cast condition, and the thermal treatment carried out at 450°C for 5 h. In addition, the hardness and electrochemical performance have been influenced by the presence and quantity of the (MgZn)49Al32 phase. The addition of magnesium alloy modifies the microstructure, increases the content of the (MgZn)49Al32 phase, and provides a localized corrosion, which leads to the breakdown of the oxide film (γ-Al2O3) formed on the Al alloy surface.
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"Structure and Properties of Composite Adsorbents Salt Inside Porous Matrix." In Technology Development for Adsorptive Heat Energy Converters, 43–87. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-4432-7.ch003.
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The chapter is devoted to structure and properties of composite adsorbents ‘salt inside porous matrix'. Characteristics of adsorbents ‘salt inside porous matrix', such as ‘zeolite – crystalline hydrate', ‘vermiculite – crystalline hydrate', ‘silica gel – crystalline hydrate' were analysed. Main advantages of composite adsorbents are shown to be higher adsorptive capacity and lower regeneration temperature as compared with host matrix. Adsorptive capacities of composite materials are shown to be significantly enhanced by introduction of salts in host matrix such as zeolite, vermiculite, or silica gel. Water uptake by composite adsorbent is shown to be increased by rising the salt content in it. The drawback of most of existing impregnation technologies is shown to be impossibility of obtaining composite with salt content more than 40 – 60% along with complexity. Sol gel method is shown to be an alternative for conventional impregnation methods. Properties of adsorbents ‘silica gel – sodium sulphate' synthesized according to sol gel method developed by authors were considered. The composite ‘silica gel – sodium sulphate' composition and structure were studied by IR-spectroscopy and wide-angle x-ray scattering. Adsorptive properties of crystalline Na2SO4 when allocated in silicon oxygen matrix are shown to result from dispersion up to nanoscale. Adsorptive capacities and heat of adsorption of composites ‘silica gel – sodium sulphate' and ‘silica gel – sodium acetate' surpass almost by 30% the value calculated from the linear superposition of the sorption capacities of the sorbent and massive salt. Their adsorption properties are shown to be not a linear combination of properties of silica gel and salt. The formation of a unique structure promoting an increase in the rate of reaction between crystalline hydrates and water vapor in the developed pores of the silicon-oxygen matrix is confirmed. It leads to increasing the heat of adsorption and the heat energy storage density. Strong difference of water sorption kinetic curves of composite ‘silica gel – sodium sulphate' and massive sodium sulphate is revealed. The correlation of their composition, structure, water adsorption kinetic, and operating characteristic as heat storage material is stated.
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Mahmoud Waheeb, Omar. "Connect Two Crude Oil Distillation Units with One Crude Oil De-Salter in Dewania Refinery." In Crude Oil - New Technologies and Recent Approaches [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.98182.
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Crude oil, which exported to refineries, already contains salt, water, and fouling crude oil received with salt content not less than 50 ppm. Dewania refinery with a capacity of 20,000 BPSD, which serves with two crude distillation units, each unit with a capacity of 10,000 BPSD, which operate without crude desalter. In an aim to reduce the effects of salts, water and, fouling associated with crude oil, two crude distillation units connected with one crude oil desalter with a capacity of 20,000 BPSD (one desalter). crude oil desalter transferred from (Daura Refinery) to Dewania refinery, in aim to reduce salt content from 50ppm to 5 ppm and mitigate water and other fouling. Crude oil desalter installed in the middle distance between two crude distillations units (90 m from each unit isometric piping). Crude oil, which is pumped by a charge pump to preheated in crude oil distillation unit with a train of heat exchangers. When the pipeline size increased from 4″ to 6″, which reduces the pressure dropped from 0.946 to 0.15 bar for each transfer pipeline and in consequence, the total pressure drop reduces from 11.011 to 10.215 bar for the whole unit. In an aim to reduce the heat dissipated from surface of transfer pipeline. Each transfer pipeline insulated with calcium silicate insulator, the thickness of insulator increased from 38mm to 50mm in an aim to reduce heat loss from −101.56 watts/m to −84.282 watts/m, which reduced temperature difference between the surface pipeline and environment from 13 to 10°C.
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Rohling, Eelco J. "Changes During The Industrial Age." In The Climate Question. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190910877.003.0008.
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Most of the 1°C temperature change since the start of the industrial revolution has occurred in the last six decades (Figure 1.1). The warming is evident in all independently monitored timeseries of global temperature. The general warming trend has been overprinted by variability on a lot of different timescales, largely because of internal (re-) distributions of heat within the atmosphere- ocean system. The world ocean, with an average depth of 3700 m, has more than 1000 times the heat capacity of the atmosphere. Even just the upper 700 m that are in effective exchange with the atmosphere have 200 times the heat capacity of the atmosphere. As a result, even a tiny fraction of a degree centigrade change in just the upper ocean represents an enormous amount of heat. This means two things: first, atmospheric temperature can be substantially affected by almost undetectable changes in the ocean; and second, ocean heat gain calculation requires very precise temperature measurements. Precise measurement series for the ocean only exist since about 1960. Let’s have a look at what atmospheric and oceanic heat gains tell us about the Earth’s energy balance since the industrial revolution. The roughly 1°C rise of Earth’s surface temperature during the indus-trial age, with more than two- thirds of it since about 1960, represents the “realized” response to forcing. Using standard values for global climate sensitivity to radiative forcing, we can determine that this 1° C warming corresponds to a component of climate forcing of roughly 1.1 to 1.3 W/m2. In contrast, the ocean is such a vast reservoir to heat up that it has not yet realized its full warming—ocean warming will therefore continue to develop over many decades to centuries even if we managed to “freeze” all radiative forcing agents at their current levels. Since 1960, the heat content of the upper 2000 m of the ocean has increased by roughly 27 x 1022 joules in about 55 years. This is an enormous number; namely 27 followed by 22 zeroes. For comparison, the most powerful nuclear detonation ever had a yield of about 22 x 1016 joules.
Conference papers on the topic "Heat content; Capacity; Casting"
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Suresh, R., and Joel Hemanth. "Assessment of Dispersiod Content and Chill Effect for Improved Mechanical Properties of Chilled Aluminium Alloy Quartz Particulate Composite." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-67433.
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This paper deals with the assessment of dispersiod content and the effect of chill for improved mechanical properties. Investigation is carried out to evaluate Ultimate Tensile Strength (UTS), Fracture toughness, Hardness, and microstructure of chilled aluminum matrix and quartz particulate composite. In the present work, Quartz (SiO2) particles ranging from 30- to 100μm were chosen as dispersiod and added, ranging from 3 to 12 wt% in steps of 3%. The composite was prepared by stir-casting technique and poured into the sand molds incorporated with non-metallic and metallic chills. Test result showed that this MMC was greatly influenced by the dispersiod and chills. Fracture toughness & UTS of the composite are found to depend on the wt% of the dispersiod and chilling medium. It is observed that chill has influenced hardness of the composite. Volumetric heat capacity (VHC) of the chill is found to increase the amount of heat absorbed. Microstructure analysis also reveled uniform distribution of the dispersiod, which results in improved properties of the particulate metal matrix composite.
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Haga, Toshio, Sinjiro Imamura, Hisaki Watari, and Shinichi Nishida. "Effect of Casting Conditions on Fluidity of Aluminum Alloy in Die Casting." In JSME 2020 Conference on Leading Edge Manufacturing/Materials and Processing. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/lemp2020-8625.
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Abstract The fluidity of pure aluminum and Al-Si alloys was investigated for casting thin products using a spiral die in die casting. An aluminum alloy with good fluidity can be die-cast into thin products. For a Si content of less than 6 mass%, the fluidity increased with decreasing Si content. For a Si content of greater than 6 mass%, the fluidity increased with increasing Si content. The fluidity was affected by latent heat, flowability in the semisolid state, and heat transfer between the die and metal. For pure aluminum, the latent heat is small and there is no semisolid state. However, pure aluminum has excellent fluidity because the heat transfer between the die and metal is small. For Al-25%Si, the latent heat is very large and flowability increases in the semisolid state. Therefore, the fluidity of Al-25%Si is high. Fluidity typically increases with increasing die temperature. The increase in fluidity due to an increase in die temperature for the pure aluminum is small compared with that for hypoeutectic Al-Si alloys. This means that the heat transfer between the pure aluminum and the die is smaller than that for hypoeutectic Al-Si alloys. Therefore, the influence of die temperature on the fluidity of the pure aluminum is small. It is estimated that the chill layer of the pure aluminum rapidly peels from the die, decreasing the heat transfer between the pure aluminum and the die.
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Chae, Yongseok, Enrique J. Lavernia, and Brian J. Wong. "Effect of water content on specific heat capacity of porcine septum cartilage." In International Symposium on Biomedical Optics, edited by Steven L. Jacques, Donald D. Duncan, Sean J. Kirkpatrick, and Andres Kriete. SPIE, 2002. http://dx.doi.org/10.1117/12.472508.
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Mueller, Boyd A., Allen R. Price, Kenneth S. Murphy, and Gregory B. Bell. "Land Based Turbine Casting Initiative." In ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/97-gt-430.
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Howmet is currently conducting a Department of Energy funded Advanced Turbine Systems program, the Land Based Turbine Casting Initiative, to scale single crystal casting technological advances developed for aircraft gas turbine engines up to land based gas turbine sized components. The program encompasses technical activities in the areas of: low sulfur alloys (low sulfur melt processing treatments), casting process development (casting process, mold, core and wax), post-cast process development (mold, core, and gating removal, heat treatment, HIP, and inspection), and casting defect tolerance level establishment (freckles, off-orientation, low angle boundaries, and recrystallized grains). This presentation will highlight recent progress in the areas of low sulfur alloy, large single crystal casting process development, and 2.5D reconstruction X-ray inspection system development. Howmet has developed a melt treatment to reduce the sulfur content of the nickel-based superalloy ingot it manufactures. Sulfur contents achieved with this technique will be compared to sulfur levels present in currently available ingot. The effect of the reduced sulfur contents on oxidation performance is being investigated and will be reported. The casting process development activities are foundry experiments to determine the effect of different process factors on both grain and dimensional quality. The status of casting activities to scale aeroengine processes up to land based sized components will be presented. The 2.5D reconstruction uses X-ray metrology and multiple 2D X-ray views of the casting to reconstruct the 3D geometry of selected features. The large cross sections and long path lengths inherent in large utility land based components will be particularly challenging.
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Lim, Sang-Seop, and Chung-Gil Kang. "Heat Treatment Conditions of Low Carbon Steel Part Used in the Deep Sea." In ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-20172.
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With increasing oil consumption, we have to find more oil resources in the deep sea. The extreme working condition of the deep sea requires high toughness and high strength values at low temperatures. Academic institutions limited the chemical composition of the requested casting steel to meet their requirements of fracture toughness and weldability. Thus, the carbon content was set approximately 0.10% based on classification societies which required specific mechanical properties of strength, elongation, reduction area and impact energy (−40°C). In this study, we find the optimal heat treatment condition of low carbon steel (0.10%C) to obtain the desired mechanical properties at low temperature (−40°C) according to different quenching parameters (heating times) and tempering parameters (heating temperatures, cooling methods).
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Stetina, Josef, Frantisek Kavicka, Bohumil Sekanina, and Jaromir Heger. "The Influence of Thermophysical Properties on a Numerical Model of Solidification." In ASME 2002 Pressure Vessels and Piping Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/pvp2002-1202.
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Solidification and cooling of a (con)casting, with the simultaneous heating of the mold, is a case of transient spatial heat and mass transfer. This paper introduces an original and universal numerical model of solidification, cooling and heating, of a one-to-three-dimensional stationary and transient temperature field in a system comprising the casting, the mold and its surroundings. This model simulates both traditional as well as non-traditional technologies of casting conducted in foundries, metallurgical plants, forging operations, heat-treatment processes, etc. The casting process is influenced not only by the thermophysical properties (i.e. heat conductivity, the specific heat capacity and density in the solid and liquid states) of the metallic and non-metallic materials, but also by the precision with which the numerical simulation is conducted. Determining these properties is often more demanding than the actual calculation of the temperature field of the solidifying object. Since the influence of individual properties should be neither under- nor over-estimated, it is necessary to investigate them via a parametric study. It is also necessary to determine the order of these properties in terms of their importance.
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Matsuda, Yoshihiro, Toshihiro Takikita, Shin-ichiro Noumi, Naofumi Akikawa, Toyoaki Yoshida, and Masanobu Taki. "Development of Hip Diffusion Bonding Processes for ODS Alloy Turbine Vanes." In ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/99-gt-131.
Full textAbstract:
Turbine inlet temperature of gas turbine engines have been increased in order to improve engine efficiency but is closing in on the upper limit of capacity for current casting materials and thermal barrier coating systems. To cope with such situations, it is necessary to develop new material applications which have superior heat resistant properties than current casting superalloys, ODS alloys are one of the candidate materials. In this study, optimum HIP (Hot Isostatic Pressing) diffusion bonding parameters and a manufacturing process for turbine vanes of Ni base ODS (Oxide Dispersion Strengthened) alloy, MA754, were developed for the purpose of introducing advanced internal cooling structures. By using these parameters and process, HIP diffusion bonded MA754 turbine vanes were manufactured experimentally. As another application of the bonding process, MA754 turbine vanes HIP diffusion bonded with pure Cu internal cooling structure which has high thermal conductivity were also manufactured.
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Luna-Flores, Mario, Mariana Gisela Peña-Juarez, Angélica Mara Bello-Ramirez, Javier Telis-Romero, and Guadalupe Luna-Solano. "Moisture sorption isotherms and isosteric heat sorption of habanero pepper (Capsicum chínense) dehydrated powder." In 21st International Drying Symposium. Valencia: Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/ids2018.2018.7637.
Full textAbstract:
Moisture sorption isotherms of the habanero pepper powder were determined using the Dynamic Vapor Sorption (DVS) method at 20, 25, 35, 45 and 55 °C in a range of water activity from 0.10 to 0.90 at which the processes of drying, packing and storage of habanero pepper are developed. The sorption capacity decreased with increasing temperature at a given water activity and the sorption isotherms showed a sigmoid form (Type II). The hysteresis phenomenon was observed in the sorption isotherms at all temperatures studied and it was more pronounced at temperatures high. The experimental sorption curves were fitting to the GAB, BET and Oswin models. It was concluded that the models that best describe the adsorption and desorption data for habanero pepper dehydrated powder were the GAB and Oswin models. The isosteric heat of water sorption was calculated with the moisture content data in equilibrium. The desorption isotherms present a higher isosteric heat in relation to the adsorption isotherms. In both, the isosteric heat decreased as the moisture content increased. Keywords: Habanero pepper dehydrated powder; Convective drying; Moisture sorption isotherms; Mathematic models
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Lohan, John, Niall Burke, and Michael Greene. "Climate Variables That Influence the Thermal Performance of Horizontal Collector Ground Source Heat Pumps." In ASME 8th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2006. http://dx.doi.org/10.1115/esda2006-95589.
Full textAbstract:
The performance characteristics of new heat pumps are usually evaluated under standard test conditions in certified test laboratories prior to their market release. While this data allows potential customers an opportunity to compare different heat pumps under the same conditions it is difficult to assess how variations in operating conditions, particularly around horizontally oriented ground collectors impact on heat pump Coefficient Of Performance (COP). Indeed, harsh winter conditions of continental climates dictate that horizontal collectors are buried sufficiently deep enough to operate in a thermally stable environment, independent of the weather, but this is not as critical in milder maritime climates and shallower collectors that may be influenced by climate are used. This review paper therefore seeks to identify the key climate variables that have been shown to influence the efficiency of horizontal collector heat pump systems. The literature highlights the significant impact of soil moisture content on COP, but the extended relationship between climate, moisture content and COP has not been established. Historical climate data from both a continental and maritime climate is presented and key aspects of their respective weather patterns are compared to assess their capacity to influence soil condition and COP. A series of empirical models linking changes in soil moisture content to fluctuations in soil thermal conductivity, diffusivity and resistance are also presented so that the impact of climate on soil thermal energy content and heat transfer characteristics might be assessed. However, since no one study has experimentally determined the complex relationship between climate, soil heat transfer characteristics and heat pump performance, this paper concludes with an overview of an experimental test facility that allows this relationship to be established for horizontal collector heat pumps in maritime climates.
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Chen, Wei, and Wei Liu. "Numerical and Experimental Analysis of Convection Heat Transfer in a Lean-To Type Greenhouse." In ASME 2004 International Solar Energy Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/isec2004-65009.
Full textAbstract:
In this paper, heat transfer and flow in a lean-to passive solar greenhouse has been studied. A mathematical model based on energy equilibrium and a one-dimensional mathematical model for the unsaturated porous medium have been founded and developed to predict the temperature and moisture content in soil and the enclosed air temperature in the greenhouse. On the condition that plant and massive wall is neglected, the air is mainly heated by the soil surface in the greenhouse, which absorbs the incident solar radiation. With increase in depth, the variation of the temperature and moisture content in soil decreases on account of ambient, and the appearance of the peak temperature in soil postpones. Solar irradiation absorber, heat storage and insulation are the main effects of the north massive wall on greenhouse, which is influenced by the structure and the material. The specific heat capacity and thermal conductivity of wall material have a remarkable effect on the north wall temperature. The build-up north wall with thermal insulation material may be chosen for greenhouse. The temperature distribution and gas flow in greenhouse is influenced by the cover material of the inside surface of the north wall. All results should be taken into account for a better design and run of a greenhouse.