Academic literature on the topic 'Capillary melting'

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Journal articles on the topic "Capillary melting"

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Lysek, Mark, Marissa LaMadrid, Peter Day, and David Goodstein. "The melting of unsaturated capillary condensate." Langmuir 9, no. 4 (April 1993): 1040–45. http://dx.doi.org/10.1021/la00028a027.

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MAEDA, NOBUO, and VASSILI V. YAMINSKY. "EXPERIMENTAL OBSERVATIONS OF SURFACE FREEZING." International Journal of Modern Physics B 15, no. 23 (September 20, 2001): 3055–77. http://dx.doi.org/10.1142/s0217979201007051.

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Capillary phase transitions and those induced by interfaces, like pre-melting, have been studied for decades. The related phenomenon of surface freezing has not been explored so extensively. We review experiments on surface freezing, those of long-chain n-alkanes in particular, and place the results within the wider thermodynamic framework of surface phase transitions. Surface freezing plays an important role in nucleation and crystallization of bulk long-chain n-alkanes. Implications for capillary melting and freezing of substances at nanoscales are discussed. Theoretical aspects of condensed capillary phase transitions will be reviewed separately.
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Genbach, Alexander, Nellya Jamankulova, and Vukman Bakic. "Capillary-porous heat exchangers for cooling of melting units." Thermal Science 22, Suppl. 5 (2018): 1359–69. http://dx.doi.org/10.2298/tsci18s5359g.

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The model of development of a vapor phase in porous structures of heat exchangers for cooling of melting units on the basis of cinema observations which ex-plains the mechanism of nucleation, development, and death of steam bubbles is created. In case of crisis of heat exchange, there are the limiting conditions of a surface of a porous coating and metal substrate. The process of destroying can come from melting, or from heat stresses of compression and stretching. The reliability of a cooling system of melting units is defined by the combined action of capillary and mass forces.
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Fretwell, H. M., J. A. Duffy, M. A. Alam, and R. Evans. "Anomalous freezing and melting behaviour of capillary confined CO2." Journal of Radioanalytical and Nuclear Chemistry Articles 210, no. 2 (November 1996): 575–82. http://dx.doi.org/10.1007/bf02056398.

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Parmigiani, A., C. Huber, O. Bachmann, and B. Chopard. "Pore-scale mass and reactant transport in multiphase porous media flows." Journal of Fluid Mechanics 686 (September 30, 2011): 40–76. http://dx.doi.org/10.1017/jfm.2011.268.

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AbstractReactive processes associated with multiphase flows play a significant role in mass transport in unsaturated porous media. For example, the effect of reactions on the solid matrix can affect the formation and stability of fingering instabilities associated with the invasion of a buoyant non-wetting fluid. In this study, we focus on the formation and stability of capillary channels of a buoyant non-wetting fluid (developed because of capillary instabilities) and their impact on the transport and distribution of a reactant in the porous medium. We use a combination of pore-scale numerical calculations based on a multiphase reactive lattice Boltzmann model (LBM) and scaling laws to quantify (i) the effect of dissolution on the preservation of capillary instabilities, (ii) the penetration depth of reaction beyond the dissolution/melting front, and (iii) the temporal and spatial distribution of dissolution/melting under different conditions (concentration of reactant in the non-wetting fluid, injection rate). Our results show that, even for tortuous non-wetting fluid channels, simple scaling laws assuming an axisymmetrical annular flow can explain (i) the exponential decay of reactant along capillary channels, (ii) the dependence of the penetration depth of reactant on a local Péclet number (using the non-wetting fluid velocity in the channel) and more qualitatively (iii) the importance of the melting/reaction efficiency on the stability of non-wetting fluid channels. Our numerical method allows us to study the feedbacks between the immiscible multiphase fluid flow and a dynamically evolving porous matrix (dissolution or melting) which is an essential component of reactive transport in porous media.
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Esarte, Jesús, Jesús M. Blanco, Angela Bernardini, and Ramón Sancibrián. "Performance Assessment of a Three-Dimensional Printed Porous Media Produced by Selective Laser Melting Technology for the Optimization of Loop Heat Pipe Wicks." Applied Sciences 9, no. 14 (July 19, 2019): 2905. http://dx.doi.org/10.3390/app9142905.

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The primary wick in a loop heat pipe device is a key component that is central to the operation of the device. Both high permeability and capillary pumping capacity, two properties highly dependent on wick structure, are strongly desirable for a satisfactory thermal performance. In this paper, selective laser melting (SLM), a three-dimensional (3D) printing technology, is used to create a primary wick for an 80 W heat transfer application. The permeability and capillarity values of this wick, experimentally measured, are compared with those built with the most widely used technologies nowadays, such as powder sintering and meshes. In this study, the SLM scaffold is shown to satisfy the minimum values required by the application in terms of capillarity and permeability: 0.031 mm/s and 4 × 10−12 m2, respectively. Our comparative study revealed that the wick produced with the SLM technology presented higher values of permeability, by two orders of magnitude, and slightly higher capillary figures than those corresponding to powder sintering for such application. However, it had capillary values well below those of a stainless-steel mesh. The hydraulic behavior of the SLM wick was better than that of the sintered copper powder, because it not only met the above-mentioned specifications, but it also improved its performance.
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Oraltay, R. G., and J. Hallett. "The Melting Layer: A Laboratory Investigation of Ice Particle Melt and Evaporation near 0°C." Journal of Applied Meteorology and Climatology 44, no. 2 (February 1, 2005): 206–20. http://dx.doi.org/10.1175/jam2194.1.

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Abstract Melting, freezing, and evaporation of individual and aggregates of snow crystals are simulated in the laboratory under controlled temperature, relative humidity, and air velocity. Crystals of selected habit are grown on a vertical filament and subsequently melted or evaporated in reverse flow, with the velocity adjusted for appropriate fall speed to reproduce conditions of the melting layer. Nonequilibrium conditions are simulated for larger melting ice particles surrounded by smaller drops at a temperature up to +5°C or growth of an ice crystal surrounded by freezing ice particles down to −5°C. Initial melting of well-defined faceted crystals, as individuals or in combination, occurs as a water layer >10 μm thick. For larger (>100 μm) crystals the water becomes sequestered by capillary forces as individual drops separated by water-free ice regions, often having quasiperiodic locations along needles, columns, or arms from evaporating dendrites. Drops are also located at intersections of aggregate crystals and dendrite branches, being responsible for the maximum of the radar scatter. The drops have a finite water–ice contact angle of 37°–80°, depending on ambient conditions. Capillary forces move water from high-curvature to low-curvature regions as melting continues. Toward the end of the melting process, the ice separating the drops becomes sufficiently thin to fracture under aerodynamic forces, and mixed-phase particles are shed. Otherwise ice-free drops are shed. The melting region and the mechanism for lowering the melting layer with an increasing precipitation rate are associated with smaller ice particle production capable of being lofted in weaker updrafts.
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Sun, Qiang, Mei Du, Xingxun Li, Xuqiang Guo, and Lanying Yang. "Morphology Investigation on Cyclopentane Hydrate Formation/Dissociation in a Sub-Millimeter-Sized Capillary." Crystals 9, no. 6 (June 14, 2019): 307. http://dx.doi.org/10.3390/cryst9060307.

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The formation, dissociation, and reformation of cyclopentane (CP) hydrate in a sub-millimeter-sized capillary were conducted in this work, and the morphology of CP hydrate was obtained during above processes, respectively. The influences of the supercooling degree, i.e., the hydrate formation driving force, on CP hydrate crystals’ aspect and growth rate were also investigated. The results demonstrate that CP forms hydrate with the water melting from ice at the interface between the CP and melting water at a temperature slightly above 273.15 K. With the action of hydrate memory effect, the CP hydrate in the capillary starts forming at the CP-water interface or CP–water–capillary three-phase junction and grows around the CP–water interface. The appearance and growth rate of CP hydrate are greatly influenced by the supercooling degree. It indicates that CP hydrate has a high aggregation degree and good regularity at a high supercooling degree (or a low formation temperature). The growth rate of CP hydrate crystals greatly increases with the supercooling degree. Consequently, the temperature has a significant influence on the formation of CP hydrate in the capillary. That means the features of CP hydrate crystals in a quiescent system could be determined and controlled by the temperature setting.
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Demin, V. A., A. I. Mizev, M. I. Petukhov, and A. V. Shmyrov. "Separation of Low-Melting Metal Melts in a Thin Inclined Capillary." Fluid Dynamics 54, no. 1 (January 2019): 1–13. http://dx.doi.org/10.1134/s001546281901004x.

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Chernov, A. A., and L. V. Mikheev. "Wetting and surface melting: Capillary fluctuations vs. layerwise short-range order." Physica A: Statistical Mechanics and its Applications 157, no. 2 (June 1989): 1042–58. http://dx.doi.org/10.1016/0378-4371(89)90080-0.

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Dissertations / Theses on the topic "Capillary melting"

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Maeda, Nobuo, and nobuo@engineering ucsb edu. "Phase Transitions of Long-Chain N-Alkanes at Interfaces." The Australian National University. Research School of Physical Sciences and Engineering, 2001. http://thesis.anu.edu.au./public/adt-ANU20011203.151921.

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An experimental study of phase transitions of long-chain n-alkanes induced by the effect of interfaces is described. ¶ The phase behaviour of long-chain n-alkanes (carbon number 14, 16, 17, 18) adsorbed at isolated mica surfaces and confined between two mica surfaces has been studied in the vicinity of and down to several degrees below the bulk melting points, Tm. Using the Surface Force Apparatus we have measured the thickness of alkane films adsorbed from vapour (0.97 [equal to or greater-than] p/p[subscript o] [equal to or greater-than] 0.997), studied capillary condensation transition, subsequent growth of capillary condensates between two surfaces, and phase transitions in both the adsorbed films and the condensates. By measuring the growth rate of the capillary condensates we have identified a transition in the lateral mobility of molecules in the adsorbed films on isolated mica surfaces. This transition to greater mobility occurs slightly above Tm for n-hexadecane, n-heptadecane and n-octadecane but several degrees below Tm for n-tetradecane, and is accompanied by a change in wetting behaviour and a measurable decrease in adsorbed film thickness for n-heptadecane and n-octadecane. Capillary condensates that form below Tm remain liquid, but may freeze if the degree of confinement is reduced by separation of the mica surfaces. An increase in the area of the liquid-vapour interface relative to that of the liquid-mica interface facilitates freezing in the case of the long-chain alkanes, which show surface freezing at the liquid-vapour interface. ¶ Although thermodynamic properties of the surface freezing transition have been rather well documented, the kinetics involved in formation of such ordered monolayers has so far received very little attention. We studied the surface tension of n-octadecane as a function of temperature in the vicinity of Tm, using the static Wilhelmy plate and the dynamic maximum bubble pressure methods. The two methods give different results on cooling paths, where nucleation of the surface ordered phase is involved, but agree on heating paths, where both methods measure properties of the equilibrium surface phase. On cooling paths, the surface of bubbles may supercool below the equilibrium surface freezing temperature. The onset of surface freezing is marked by a sharp drop in the surface tension. The transition is accompanied by an increased stability of the films resulting in longer bubble lifetimes at the liquid surface, which suggests that the mechanical properties of the surfaces change from liquid-like to solid-like. Our results suggest occurrence of supercooling of the monolayer itself.
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Book chapters on the topic "Capillary melting"

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Glicksman, M. E., A. Lupulescu, and M. B. Koss. "Capillary Mediated Melting of Ellipsoidal Needle Crystals." In Free Boundary Problems, 219–30. Basel: Birkhäuser Basel, 2006. http://dx.doi.org/10.1007/978-3-7643-7719-9_22.

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Technical, AACC. "Melting Point--Capillary Method." In AACC International Approved Methods. AACC International, 2009. http://dx.doi.org/10.1094/aaccintmethod-58-40.01.

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Conference papers on the topic "Capillary melting"

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Supowit, Jacob, Sean Reilly, Ladan Amouzegar, and Ivan Catton. "A Novel Inorganic Aqueous Solution and its Effect on Liquid Spreading and Freeze/Thaw Processes." In ASME 2013 Heat Transfer Summer Conference collocated with the ASME 2013 7th International Conference on Energy Sustainability and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/ht2013-17773.

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Frozen startup of phase change heat transfer devices is a complex problem that can have a large impact on heat transfer systems. A patented novel working fluid developed at UCLA comprised of an inorganic aqueous solution (IAS) was investigated for potential effects on the freeze/thaw capabilities in phase change heat transfer devices by examining the melting process of droplets. Preliminary visual tests were conducted to gain insight into any physical processes that surface augmentation created by this fluid may have on the freezing and melting process. These tests demonstrated significant differences in liquid spreading, the melting process, and the melting rate of droplets on surfaces pre-treated with IAS. Contact angle measurements exhibited enhanced wetting properties. SEM images of frozen droplets showed that liquid freezes in the small capillary wick formed by the initial evaporation of IAS. Video of melting droplets showed a significant increase in melting rate when the surface was first treated with IAS due to superior liquid spreading.
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Xiao, Bin, and Yuwen Zhang. "Partial Melting and Resolidification of Single-Component Metal Powder With a Moving Laser Beam." In ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems. ASMEDC, 2005. http://dx.doi.org/10.1115/ht2005-72161.

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Partial melting and resolidification of single-component metal powders with a moving laser beam is investigated numerically. Since laser processing of metal powder is a very rapid process, the liquid layer and solid core of a partially molten powder particle may not at thermal equilibrium and have different temperatures: the temperature of the liquid part is higher than the melting point, and the temperature of the solid core is below the melting point. Therefore, the local temperature of regions with partial molten particles is within a range of temperature adjacent to the melting point, instead of at the melting point. The partial melting of the metal powder is also accompanied by shrinkage that drives out the gas in the powder bed and the powder structure is supported by the solid core of the partially melted powder particles. Melting with shrinkage and resolidification are described using a temperature transforming model. The convection driven by capillary and gravity forces in the melting liquid pool is formulated by using Darcy’s law. The effects of laser beam intensity and scanning velocity on the shape and size of the heat affected zone and molten pool are investigated.
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Sorokin, A. P., A. G. Portianoy, E. N. Serdun, and V. G. Maltsev. "Passive Accident Protection Devices on the Basis of Technology Lyophobous of Capillary-Porous Systems." In 10th International Conference on Nuclear Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/icone10-22310.

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At present the special attention is given to increase safety of technical systems, and first of all to prevent emergencies connected with heavy ecological and economic consequences. One of perspective ways of prevention of heavy accident is the use of passive accident protection devices. The most distinctly given tendency is displayed in atomic engineering. At this moment a few hundreds technical decisions on accident protection devices of various functional purpose be known. Nevertheless devices to the full satisfying to all showed requirements are not created. New types of passive accident protection devices on a level of temperature and pressure on the basis of technology by capillary-porous lyophobous system (LCPS) are considered. The Lyophobous Passive Accident Protection Device on a level of Temperature (LPAP-T) functions on the basis of high dylatometrical effect of LCPS and represents a design as sylphon, containing capillary-porous matrix and lyophobous liquid, melting at temperature of operation. At a melting the lyophobous liquid leaves from pores of a matrix under Laplas pressure and actuates the working mechanism. Carried out calculate-experimental research have shown, that considered (LPAP-T) have the following characteristics: • range of threshold operation 70°-700° C; • generation of significant efforts (up to 104N); • low dependence a testimonial from of the operational factors. Developed (LPAP-T) has a number of advantages before known, for example by the magnetic thermal passive accident protection devices (generation of efforts), as compared with device presented in Patent USA No. 5051229 (sylphon filled with liquid metal) — threshold character, multichannels of operation.
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Chen, Tiebing, and Yuwen Zhang. "Three-Dimensional Simulation of Multiple-Line Laser Sintering of a Two-Component Metal Powder Layer on Top of Sintered Layers." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-82591.

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Multiple line laser scan sintering of a two-component metal powder layer on top of the sintered layers with a moving circular Gaussian laser beam is modeled numerically. The overlap between the adjacent scan lines to achieve enhanced bonding is taken into account. The binding between the newly sintered layer and existing sintered layers underneath through melting is also considered. The governing equation is formulated by a temperature-transforming model with partial shrinkage induced by melting considered. The liquid flow of the molten low melting point metal powders, which is driven by capillary and gravity forces, is formulated by Darcy’s law. The effects of the dominant processing parameters, including the moving laser beam intensity, scanning speed and number of the existing sintered layers underneath, on the shape of the heat affected zone (HAZ) are investigated. A parametric study is performed and the best combination of the processing parameters is recommended.
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Mistry, Utsavkumar, and Madhu Vadali. "Influence of Surface Geometry on Melt Pool Flows and Shape in Pulsed Laser Surface Melting." In ASME 2021 16th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/msec2021-60460.

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Abstract Pulsed Laser Surface Melting (pLSM) is a technique that offers an efficient way to modify the geometry surfaces without any addition or removal of material. In pLSM, an incident laser beam melts a small region on the surface and induces surface tension and viscosity-driven flows that modify the surface geometry. Initial surface geometry plays an important role in deciding the melt pool flows and shape as it governs the initial surface tension acting on the melt pool. In this paper, we present a systematic numerical study that captures the effects of initial geometries using a two-dimensional axisymmetric model. The results show that geometries with higher curvatures result in deeper melt pools and higher surface displacement because higher fluid velocities aid the convection heat transfer. Additionally, we define a modified capillary number (CaM) which elegantly captures these effects.
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Chen, Tiebing, and Yuwen Zhang. "Three-Dimensional Modeling of Laser Sintering of a Two-Component Metal Powder Layer on Top of Sintered Layers." In ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems. ASMEDC, 2005. http://dx.doi.org/10.1115/ht2005-72395.

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A three-dimensional numerical model of Selective Laser Sintering (SLS) of the metal powders for a single scan line induced by a moving laser beam interacted with a loose powder layer on top of the sintered metal layers is presented. The problem is modeled using a temperature-transforming model and the partial shrinkage induced by melting is accounted for. The heat losses at the top surface due to the natural convection and radiation are taken into account. The liquid flow of the molten low melting point metal powders, which is driven by capillary and gravity forces, is also considered and formulated by using Darcy’s law. The effects of the dominant processing parameters, such as the moving heat source intensity, scanning velocity and number of the existing sintered layers underneath are investigated. A parametric study is performed and the best combination of the processing parameters is recommended.
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Ivanov, Roman A., and Alexey V. Melkikh. "A novel method of creation capillary structures in metal parts based on using selective laser melting methid of 3D printing technology and surface roughness." In 3RD ELECTRONIC AND GREEN MATERIALS INTERNATIONAL CONFERENCE 2017 (EGM 2017). Author(s), 2017. http://dx.doi.org/10.1063/1.5002908.

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Han, L., and J. Choi. "Two Dimensional Modeling of Laser Cladding With Droplet Injection." In ASME 2003 Heat Transfer Summer Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/ht2003-47295.

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Directed Metal/Material Deposition (DMD) process is one of additive manufacturing processes based on laser cladding process. A full understanding of laser cladding process is a must to make the DMD process consistent and robust. A two dimensional mathematical model of laser cladding was developed to understand the influence of fluid flow to the mixing, dilution, and deposition dimension, incorporating melting, solidification, and evaporation phenomena. The fluid flow in the melt pool driven by thermal capillary convection and energy balance at liquid-vapor and solid-liquid interface was investigated and the impact of the droplets on the melt pool shape and ripple was studied. Dynamic motion, development of melt pool and the formation of cladding layer were simulated.
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Scott, David A., and B. Rabi Baliga. "Thermophysical Properties of a Slurry of Distilled Water and Microencapsulated Phase-Change Materials." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-61337.

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This paper presents experimental measurements of some effective thermophysical properties of slurries consisting of microencapsulated phase change materials (MCPCMs) suspended in distilled water. The related apparatus and procedures are also presented and discussed. The MCPCMs considered here consist of a core of phase-change material (PCM), in this case a substance akin to octadecane, surrounded by a solid shell. The effective density of the slurries was measured using hydrometers. The effective thermal conductivity of the slurries was measured using an in-house designed apparatus. The effective kinematic viscosity of the slurries was measured using a series of glass capillary viscometers. A differential scanning calorimeter (DSC) was used to obtain the effective specific heat, melting and freezing temperatures of the core PCMs, and the latent heat of the slurries. Slurry concentrations between 0% (pure distilled water) and 20% by mass of the MCPCMs were considered in this investigation, at temperatures ranging from 5°C to 65°C. Where possible, the results have been compared to predictions obtained using available analytical expressions with properties of the constitutive materials as inputs.
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Aoki, H., K. Sugiyama, G. H. Su, H. Sakashita, and Y. Kojima. "An Experimental Study on Coolability of Particulate Core-Metal Debris Bed With Oxidization." In 12th International Conference on Nuclear Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/icone12-49557.

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The coolability characteristics of a eutectic metal debris bed, which has a low melting point, have been assessed from the viewpoint of in-vessel retention. Ag-50wt%Zircaloy eutectic alloy, constituents of which are principal metals constituting a reactor core, was chosen as the particulate core-metal debris in the present experimental study. Ag particulates and shortly chopped Zircaloy tubes were melted by induction heating, and then the molten Ag-50wt%Zircaloy was dropped into a water pool with 80cm in depth, resulting in debris particulates. The upper interface temperature of the particulate metal debris, which was electrically heated to simulate decay heat, ranged from 500°C to 900°C, and the temperature of a water layer at the bottom side was kept at 100°C. The heat flux and the temperature at the upper interface were measured for 30 minutes. Under the wet condition where heat conducted from debris particulates to a water layer produces steam, it is confirmed that the particulate eutectic-alloy debris bed is oxidized and the perfectly oxidized parts with thin cross-section are cracked into pieces. The mass median diameter measured after each run clearly decreases compared with that measured before the run. Sieving after each run shows that an amount of small particulates less than 1mm, which is expected to produce a high capillary force, drastically increases due to oxidation. The present experimental results therefore show that the particulate eutectic-alloy debris bed exposed to a vapor atmosphere is oxidized in a short time period and consequently could be cooled because of a capillary force of small particulates produced by oxidization.
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