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Journal articles on the topic 'Heat Solidification Drops'

Author: Grafiati

Published: 4 June 2021

Last updated: 12 February 2022

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1

Lipin, Andrey A., Vladimir O. Nebukin, and Aleksandr G. Lipin. "SIMULATION OF HEAT AND MASS TRANSFER PROCESSES UNDER GRANULES CAPSULATION IN FLUIDIZED BED." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 61, no. 4-5 (2018): 98. http://dx.doi.org/10.6060/tcct.20186104-05.5624.

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The paper studies capsulation of solid particles in a spout fluidized bed. A capsulation is used to protect the particles surface from the negative impact of environmental factors as well as to regulate of active component release rate. In this work, the capsulation is carried out by spraying of polymers dispersions on fluidized bed particles by means of pneumatic nozzles. Drops of polymer dispersion having faced with the particles are spred on their surface, forming a liquid film. Solvent removing by drying causes solidification of the film. Existing calculation methods of capsulation in the

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2

Chistov, A. S., O. G. Savikhin, and I. O. Savikhin. "NUMERICAL SIMULATION OF NON-STATIONARY PROCESSES IN THE GAS TURBINE CIRCUIT OF THE SSTAR LEAD-COOLED REACTOR." Problems of strenght and plasticity 82, no. 3 (2020): 339–52. http://dx.doi.org/10.32326/1814-9146-2020-82-3-339-352.

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The problem of mathematical and numerical modeling of non-stationary processes in a closed gas turbine installation as part of an energy conversion unit of a lead-cooled reactor is considered. The problem is solved in a fairly General formulation, in which the gas circuit can include an arbitrary number of turbines with gas preheating, an arbitrary number of compressors with gas pre-cooling, as well as a heat exchanger for regenerative gas heating. Variants of both single-shaft and two-shaft gas turbine installations are considered. Point idealization is used when modeling the flow part of the

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3

ROISMAN, ILIA V. "Fast forced liquid film spreading on a substrate: flow, heat transfer and phase transition." Journal of Fluid Mechanics 656 (May 21, 2010): 189–204. http://dx.doi.org/10.1017/s0022112010001126.

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This theoretical study is devoted to description of fluid flow and heat transfer in a spreading viscous drop with phase transition. A similarity solution for the combined full Navier–Stokes equations and energy equation for the expanding lamella generated by drop impact is obtained for a general case of oblique drop impact with high Weber and Reynolds numbers. The theory is applicable to the analysis of the phenomena of drop solidification, target melting and film boiling. The theoretical predictions for the contact temperature at the substrate surface agree well with the existing experimental

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4

Åberg, Lena Magnusson, Bernard Vinet, and Hasse Fredriksson. "Heat of solidification in refractory metals studied by drop-tube experiments." Transactions of the Indian Institute of Metals 62, no. 4-5 (2009): 269–73. http://dx.doi.org/10.1007/s12666-009-0040-y.

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5

Sui, Li Jun, Zhi Wu Xu, and Li Wang. "Numerical Simulation of GMAW Process Based on Level Set Method." Advanced Materials Research 503-504 (April 2012): 65–68. http://dx.doi.org/10.4028/www.scientific.net/amr.503-504.65.

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A model based on level set function is proposed to predict gas shielded arc welding. The model describes not only the free surface tracking of molten drop and metal transfer in gas metal arc welding, but it simulates the phase change on substrate during heat transfer，which is based on porous media theory. The result of simulation shows that this model can describe the drop diameters, transfer frequency and the shape of solidification precisely.

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6

Toledo, Rafael C., Jerônimo S. Travelho, Chen Y. An, and Irajá N. Bandeira. "Heat Transfer During the Solidification of Eutectic PbSn Alloy Droplets in Drop Tubes." Microgravity Science and Technology 26, no. 2 (2014): 119–24. http://dx.doi.org/10.1007/s12217-014-9384-y.

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7

Yang, Hailin, Mingjiao Fu, Bobo Wu, Ying Zhang, Ruhua Ma, and Jueshi Qian. "Effect of Fe2O3 on the Immobilization of High-Level Waste with Magnesium Potassium Phosphate Ceramic." Science and Technology of Nuclear Installations 2019 (February 3, 2019): 1–10. http://dx.doi.org/10.1155/2019/4936379.

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For the proposed novel procedure of immobilizing HLW with magnesium potassium phosphate cement (MKPC), Fe2O3 was added as a modifying agent to verify its effect on the solidification form and the immobilization of the radioactive nuclide. The results show that Fe2O3 is inert during the hydration reaction. It slows down the hydration reaction and lowers the heat release rate of the MKPC system, leading to a 3°C-5°C drop in the mixture temperature during hydration. Early comprehensive strength of Fe2O3 containing samples decreased slightly while the long-term strength remained unchanged. For the

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8

Wittig, J. E., D. R. Kegley, W. H. Hofmeister, and R. J. Bayuzick. "Observation of cerium-oxides in rapidly solidified Ti-4wt% Ce." Proceedings, annual meeting, Electron Microscopy Society of America 47 (August 6, 1989): 506–7. http://dx.doi.org/10.1017/s0424820100154500.

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Rapid solidification of Ti rare earth alloys can produce a fine rare earth oxide dispersion. A stable distribution of rare earth oxides in a hexagonal Ti matrix has been shown to increase the flow stress at both room and elevated temperatures. Previous studies have investigated the precipitation phenomena in Ti-erbium Ti-Ianthanum, and Ti-Al-gadolinium alloys. The present research addresses oxide precipitation in a Ti-cerium alloy as a result of rapid solidification processing.Samples of Ti-4 wt% Ce were rapidly solidified by splat quenching 300 mg droplets, after free fall in a 100 m drop tub

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9

Hopmann, C., P. Nikoleizig, and H. Dornebusch. "Turbulators for Temperature Control of Injection Moulding." International Polymer Science and Technology 44, no. 2 (2017): 1–8. http://dx.doi.org/10.1177/0307174x1704400201.

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The design of a cooling channel system in an injection mould is key to successful production. Locally controlled heat removal is targeted by introducing disturbances inside the cooling channel using so called turbulators. Computational fluid dynamic simulations show different levels of heat removal depending on the shape and configuration of the turbulators, but also an increased pressure drop. Suitable turbulators are then introduced into the cooling channel of an injection mould insert. Within the scope of a design of experiments, no significant influence of the turbulators can be identified

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10

Kalaiselvam, Sivakumar, Kanchipuram Sureshkumar, and Vijeykishoor Sriram. "Study of heat transfer and pressure drop characteristics of air heat exchanger using PCM for free cooling applications." Thermal Science 20, no. 5 (2016): 1543–54. http://dx.doi.org/10.2298/tsci130531096k.

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Free cooling is the process of storing the cool energy available in the night ambient air and using it during the day. The heat exchanger used in this work is a modular type which is similar to the shell and tube heat exchanger. The shell side is filled with Phase Change Materials (PCM) and air flow is through the tubes in the module. The modules of the heat exchanger are arranged one over other with air spacers in between each module. The air space provided in between the module in-creases the retention time of the air for better heat transfer. Transient Computational Fluid Dynamics modeling

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11

Yanagihara, Emi, Goshi Aoshima, Shota Komura, Seiji Saikawa, and Susumu Ikeno. "Effect of Sr Addition on the Solidification Structure in Al-6mass%Mg-3mass%Si Alloy." Materials Science Forum 879 (November 2016): 2383–88. http://dx.doi.org/10.4028/www.scientific.net/msf.879.2383.

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Al-Mg-Si system alloy have good strength and high ductility without heat treatment. However, the castability in this alloy is inferior to other aluminum alloy, in particular, hot-tearing is easy to occur during solidification. In our previous study, hot-tearing was not occurred in the case of 0.04%Sr addition to this alloy, because of the remarkable refinement of eutectic Mg2Si phase. In this study, in order to clarify the mechanism of the change of the crystallized eutectic Mg2Si morphology, the effect of Sr addition on the solidification structure in Al-6%Mg-3%Si alloy was investigated. By S

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12

Köse, Uğur, Ufuk Koç, Latife Berrin Erbay, Erdem Öğüt, and Hüseyin Ayhan. "Heat exchanger design studies for molten salt fast reactor." EPJ Nuclear Sciences & Technologies 5 (2019): 12. http://dx.doi.org/10.1051/epjn/2019032.

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In this study, conceptual design for primary heat exchanger of the Molten Salt Fast Reactor is made. The design was carried out to remove the produced heat from the reactor developed under the SAMOFAR project. Nominal power of the reactor is 3 GWth and it has 16 heat exchangers. There are several requirements related to the heat exchanger. To sustain the steady-state conditions, heat exchangers have to transfer the heat produced in the core and it has to maintain the temperature drop as much as the temperature rise in the core due to the fission. It should do it as fast as possible. It must al

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13

Lister, John R., and Paul J. Dellar. "Solidification of pressure-driven flow in a finite rigid channel with application to volcanic eruptions." Journal of Fluid Mechanics 323 (September 25, 1996): 267–83. http://dx.doi.org/10.1017/s0022112096000912.

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Competition between conductive cooling and advective heating occurs whenever hot fluid invades a cold environment. Here the solidification of hot viscous flow driven by a fixed pressure drop through an initially planar or cylindrical channel embedded in a cold rigid solid is analysed. At early times, or far from the channel entrance, the flow starts to solidify and block the channel, thus reducing the flow rate. Close to the channel entrance, and at later times, the supply of new hot fluid starts to melt back the initial chill. Eventually, either solidification or meltback becomes dominant thr

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14

Sadrhosseini, Hani, and Saed Bazkhane. "Simplified model for polyurethane foaming in porous media." International Journal of Numerical Methods for Heat & Fluid Flow 27, no. 1 (2017): 142–55. http://dx.doi.org/10.1108/hff-08-2015-0344.

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Purpose The purpose of the study is to present a simplified model to replace the complicated foaming simulations for investigating the liquid polyurethane behavior just before solidification. Design/methodology/approach This model is inspired from the traveling heater method of crystallization because of the low injection velocity. Besides, the heat generated during the reaction is considered as a heat source function in the energy equation. Findings Various distributions of the heat generation function inside the geometry have been studied to choose the most realistic one. Effect of parameter

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15

Liu, W., G. X. Wang, and E. F. Matthys. "Thermal analysis and measurements for a molten metal drop impacting on a substrate: cooling, solidification and heat transfer coefficient." International Journal of Heat and Mass Transfer 38, no. 8 (1995): 1387–95. http://dx.doi.org/10.1016/0017-9310(94)00262-t.

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16

Zeng, Yi Dan, Qing Hu Yao, and Xia Wang. "The Effect of Air Gap between Casting and Water-Cooled Mold on Interface Heat Transfer Coefficient." Materials Science Forum 893 (March 2017): 174–80. http://dx.doi.org/10.4028/www.scientific.net/msf.893.174.

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Water-cooled casting is a new casting process. It allows even large castings to solidify rapidly, thereby reducing segregation and grain refinement. It has drawn the attention of both domestic and foreign businesses. Heat transfer at the casting/water-cooled mold interface controls the cooling rate of the casting. During the solidification process, because of the contraction that takes place during casting, an air gap can form between the casting and the water-cooled mold. This air gap hinders heat transfer between the casting and the mold, leading to a rapid drop in the interface heat transfe

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17

Cao, Hai Ping, and Magnus Wessen. "Mechanisms of Segregation Band Defect Formation in Pressure Die-Cast Magnesium Components." Materials Science Forum 488-489 (July 2005): 381–84. http://dx.doi.org/10.4028/www.scientific.net/msf.488-489.381.

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Segregation bands which normally follow the outer contours of a casting are common in commercial magnesium alloy pressure die castings. Several models have been proposed in the literatures which attempt to explain mechanisms behind the formation of this type of segregation bands. However, it is difficult to explain some phenomena which occur in real die cast components. In this paper, a new theory concerning the formation of one common and detrimental segregation band defect (Type I) has been proposed, which is based on a coupled analysis of heat flow and volume changes during solidification.

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18

Terner, Mathieu, Jiwon Lee, Giulio Marchese, Sara Biamino, and Hyun-Uk Hong. "Electron Backscattered Diffraction to Estimate Residual Stress Levels of a Superalloy Produced by Laser Powder Bed Fusion and Subsequent Heat Treatments." Materials 13, no. 20 (2020): 4643. http://dx.doi.org/10.3390/ma13204643.

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Metal Additive Manufacturing and Laser Powder Bed Fusion (LPBF), in particular, have come forth in recent years as an outstanding innovative manufacturing approach. The LPBF process is notably characterized by very high solidification and cooling rates, as well as repeated abrupt heating and cooling cycles, which generate the build-up of anisotropic microstructure and residual stresses. Post-processing stress-relieving heat treatments at elevated temperatures are often required in order to release some of these stresses. The effects of 1 h–hold heat treatments at different specific temperature

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19

Balint, Stefan, and Agneta M. Balint. "On the Creation of a Stable Drop-Like Static Meniscus, Appropriate for the Growth of a Single Crystal Tube with Prior Specified Inner and Outer Radii." Mathematical Problems in Engineering 2009 (2009): 1–22. http://dx.doi.org/10.1155/2009/348538.

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A theoretical procedure for the creation of a stable drop-like static meniscus, appropriate for the growth of a single crystal tube, with a priori specified inner and outer radius, is presented. The method locates the controllable partpof the pressure difference across the free surface. It consists in a set of calculus, which leads to the determination of the melt column height (between the horizontal crucible melt level and the shaper top level) in function of the pressure of the gas flow (introduced in the furnace for release the heat) in order to obtain the desired meniscus. The procedure i

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20

Aydin, Ilgin, Dotse Selali Chormey, Türkan Budak, Merve Fırat, Fatma Turak, and Sezgin Bakirdere. "Development of an Accurate and Sensitive Analytical Method for the Determination of Cadmium at Trace Levels Using Dispersive Liquid–Liquid Microextraction Based on the Solidification of Floating Organic Drops Combined with Slotted Quartz Tube Flame Atomic Absorption Spectrometry." Journal of AOAC INTERNATIONAL 101, no. 3 (2018): 843–47. http://dx.doi.org/10.5740/jaoacint.17-0131.

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Abstract A dispersive liquid–liquid microextraction (DLLME) technique based on a solidification-of-floating-organic-drop (SFOD) procedure was developed for the determination of trace amounts of cadmium (Cd) by using a flame atomic absorption spectrometer (FAAS) fitted with a slotted quartz tube (SQT). The extraction of Cd was achieved by forming a complex with diphenylcarbazone. Parameters affecting the formation of complex and extraction outputs were carefully optimized to obtain high-absorbance signals to achieve lower LODs. An SQT was fitted on top of the flame burner head to further enhanc

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21

Mikhal’chenkov, Aleksandr, Sergey Fes’kov, Irina Kozarez, and Elena Slezko. "CHANGES IN THE MICROSTRUCTURE AND MICROHARDNESS OF 65G STEEL AFTER THERMAL HARDENING AND SURFACING WITH A LOW-CARBON ELECTRODE." Tekhnicheskiy servis mashin 1, no. 142 (2021): 107–14. http://dx.doi.org/10.22314/2618-8287-2020-59-1-107-114.

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When reinforcing the surfaces of the working bodies of tillage tools, they are surfaced with electrodes with a low-carbon rod. The surface in contact with the soil is not subjected to heat treatment. Recently, thermal hardening of local parts has been used. (Research purpose) The research purpose is in studying the transformation of the microstructure of 65G heat-strengthened steel deposited by an electrode with a low-carbon rod, as well as the specifics of the microhardness distribution in this section. (Materials and methods) Investigated in the cross-section of the structure of the deposite

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22

Tait, Stephen R., and Claude Jaupart. "The production of chemically stratified and adcumulate plutonic igneous rocks." Mineralogical Magazine 60, no. 398 (1996): 99–114. http://dx.doi.org/10.1180/minmag.1996.060.398.07.

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AbstractWe review recent advances on the physical principles of crystallization in multicomponent systems, and use them to provide a framework for interpreting petrological and geochemical observations from igneous intrusions. The thermal structure of crystallizing boundary layers imposes strong constraints on the chemical and mineralogical compositions of the solid that can form from a given melt. The thermal problem is largely independent of the chemical composition of the melt, and sets the course of crystallization. A key problem to understand is the temperature of the solidification front

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23

Álvarez, Pedro, Alberto Cobos, Lexuri Vázquez, et al. "Weldability Evaluation of Alloy 718 Investment Castings with Different Si Contents and Thermal Stories and Hot Cracking Mechanism in Their Laser Beam Welds." Metals 11, no. 3 (2021): 402. http://dx.doi.org/10.3390/met11030402.

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In this work, weldability and hot cracking susceptibility of five alloy 718 investment castings in laser beam welding (LBW) were investigated. Influence of chemical composition, with varying Si contents from 0.05 to 0.17 wt %, solidification rate, and pre-weld heat treatment were studied by carrying out three different weldability tests, i.e., hot ductility, Varestraint, and bead-on-plate tests, after hot isostatic pressing (HIP) and solution annealing treatment. Onset of hot ductility drop was directly related to the presence of residual Laves phase, whereas the hot ductility recovery behavio

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24

Marcos, Marco A., David Cabaleiro, Samah Hamze, et al. "NePCM Based on Silver Dispersions in Poly(Ethylene Glycol) as a Stable Solution for Thermal Storage." Nanomaterials 10, no. 1 (2019): 19. http://dx.doi.org/10.3390/nano10010019.

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The main objective of this study is to design and characterize silver suspensions based on poly(ethylene glycol) PEG400, Ag/PEG400, as energy storage media for low-temperature applications. A polyvinylpyrrolidone (PVP) treatment was applied to ~22 nm silver nanoparticles to ensure good stability in poly(ethylene glycol). An array of different experimental techniques was utilized to analyze the molecular mass and purity of base poly(ethylene glycol), morphology of dry PVP-capped Ag nanoparticles, hydrodynamic average size of dispersed Ag particles, as well as thermal stability of PEG400 and Ag/

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25

McCoy, J. Kevin, Alan J. Markworth, Robert S. Brodkey, and E. W. Collings. "Analysis of the Free-Fall Behavior of Liquid-Metal Drops in a Gaseous Atmosphere." MRS Proceedings 87 (1986). http://dx.doi.org/10.1557/proc-87-163.

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AbstractThe free fall of a liquid-metal drop and heat transfer from the drop to its environment are described for both a gaseous atmosphere and vacuum. A simple model, in which the drop is assumed to fall rectilinearly with behavior like that of a rigid particle, is developed first, then possible causes of deviation from this behavior are discussed. The model is applied to describe solidification of drops in a drop tube. Possible future develop-ments of the model are suggested.

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26

Shabgard, Hamidreza, Amir Faghri, Theodore L. Bergman, and Charles E. Andraka. "Numerical Simulation of Heat Pipe-Assisted Latent Heat Thermal Energy Storage Unit for Dish-Stirling Systems." Journal of Solar Energy Engineering 136, no. 2 (2013). http://dx.doi.org/10.1115/1.4025973.

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A two-dimensional numerical model is developed to simulate the transient response of a heat pipe-assisted latent heat thermal energy storage (LHTES) unit integrated with dish-Stirling solar power generation systems. The unit consists of a container which houses a phase change material (PCM) and two sets of interlaced input and output heat pipes (HPs) embedded in the PCM. The LHTES unit is exposed to time-varying concentrated solar irradiance. A three-stage operating scenario is investigated that includes: (i) charging only, (ii) simultaneous charging and discharging, and (iii) discharging only

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27

Shong, D. S., J. A. Graves, Y. Ujiie, and J. H. Perepezko. "Containerless Processing of Undercooled Melts." MRS Proceedings 87 (1986). http://dx.doi.org/10.1557/proc-87-17.

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AbstractContainerless drop tube processing allows for significant levels of liquid undercooling through control of parameters such as sample size, surface coating and cooling rate. A laboratory scale (3m) drop tube has been developed which allows the under-cooling and solidification behavior of powder samples to be eval-uated under low gravity free fall conditions. The level of undercooling obtained in an InSb-Sb eutectic alloy has been eval-uated by comparing the eutectic spacing in drop tube samples with a spacing/undercooling relationship established using thermal analysis techniques. Under

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28

Molian, Raathai, Pranav Shrotriya, and Pal Molian. "Improved Method of CO2 Laser Cutting of Aluminum Nitride." Journal of Electronic Packaging 130, no. 2 (2008). http://dx.doi.org/10.1115/1.2912223.

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The traditional “evaporation∕melt and blow” mechanism of CO2 laser cutting of aluminum nitride (AlN) chip carriers and heat sinks suffers from energy losses due to its high thermal conductivity, formation of dross, decomposition to aluminum, and uncontrolled thermal cracking. In order to overcome these limitations, a thermochemical method that uses a defocused laser beam to melt a thin layer of AlN surface in oxygen environment was utilized. Subsequent solidification of the melt layer generated shrinkage and thermal gradient stresses that, in turn, created a crack along the middle path of lase

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29

Wilson, R. D., J. A. Hawk, and J. H. Devletian. "Capacitor Discharge Weld Modelling Using Ultra High Speed Photography." MRS Proceedings 314 (1993). http://dx.doi.org/10.1557/proc-314-151.

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AbstractCapacitor discharge welding (CDW) is a rapid solidification joining process where high cooling rates (106 K/s) are obtained as a result of the large weld surface area to small weld volume. The objective of this study, directed by the U.S. Bureau of Mines and the Oregon Graduate Institute of Science and Technology, was to use ultra-high speed photography to quantify transient arc behavior during the CDW cycle. The simple cylindrical geometries of the CD welds have been used to formulate analytical models which are compared to the high speed photographs of the welding process. The high s

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30

Carpenter, Kevin, and Ali Tabei. "Optimization of the Weld Setup in Magnetically Assisted Laser Welding by Thermo-Magnetic Modeling." Journal of Manufacturing Science and Engineering 143, no. 3 (2020). http://dx.doi.org/10.1115/1.4048046.

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Abstract The application of magnetic fields during solidification processes has been reported to control the flow and turbulence in the melt pool and leads to improvements in the microstructure, namely crystallographic orientations and grain size. In order to maximize the benefits of assisting a welding process with externally applied magnetic fields, it is necessary to optimize the weld setup, as the relative distances between magnets and weldment can remarkably affect the magnitude and direction of the applied field. Furthermore, the usage of permanent magnets requires an additional caution

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