Academic literature on the topic 'Core-shell drop'

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Journal articles on the topic "Core-shell drop"

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Hsuan, Chung-Yao, Shuhn-Shyurng Hou, and Ta-Hui Lin. "Analysis of Completely Prevaporized Spray Flames with Water/Octane Core/Shell Structured Droplets." Mathematical Problems in Engineering 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/584926.

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A series of studies on laminar flame propagation in off-stoichiometric dilute sprays of monodispersed inert or fuel drops had been investigated by large activation energy asymptotics. The present study extends previous theoretical model to consider water/octane core/shell structured drops instead of single-phase drops. The core/shell structured drops are composed of core fluid (water) encased by a layer of shell fluid (n-octane). In this study, we only deal with the case that core/shell structured drops are vaporized completely just at flame location. Namely, the discussions of this paper are restricted to the completely prevaporized mode. By varying parameters of core water radius, core-to-shell ratio, the amount of liquid loading, and the stoichiometric ratio (lean or rich burning), we examine the gasification of core water and shell fuel of core/shell structured drops upstream of the bulk flame and its relation to the internal heat transfer. The effects of drop radius, core-to-shell ratio, liquid loading, and overall heat loss or gain on flame propagation flux are reported and discussed.
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GAO, PENG, and JAMES J. FENG. "Spreading and breakup of a compound drop on a partially wetting substrate." Journal of Fluid Mechanics 682 (July 1, 2011): 415–33. http://dx.doi.org/10.1017/jfm.2011.235.

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The spreading of a compound drop on a partially wetting solid substrate is numerically simulated using a diffuse-interface method. Compared with a simple drop, the spreading of a compound drop exhibits much more complex behaviour. Depending on the core–shell size ratio and the substrate wettability, various flow regimes are identified in which the interfacial morphology evolves in distinct ways. A phase diagram is constructed in the parameter space of the core–shell size ratio and the wetting angle. For relatively small inner drops, the outer interface does not rupture during the spreading and the inner drop either remains suspended and encapsulated or attaches onto the substrate. Otherwise, the compound drop spontaneously breaks up and releases the inner drop into the ambient fluid. Several breakup scenarios are observed depending on the location of the initial rupture. In some regimes, the wetting of the substrate by one fluid can entrap secondary drops of the other, which can either attach to the substrate or stay suspended. The viscosity ratio mainly affects the spreading rate and plays a minor role in the morphology evolution.
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Blanken, Nathan, Muhammad Saeed Saleem, Carlo Antonini, and Marie-Jean Thoraval. "Rebound of self-lubricating compound drops." Science Advances 6, no. 11 (March 2020): eaay3499. http://dx.doi.org/10.1126/sciadv.aay3499.

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Drop impact on solid surfaces is encountered in numerous natural and technological processes. Although the impact of single-phase drops has been widely explored, the impact of compound drops has received little attention. Here, we demonstrate a self-lubrication mechanism for water-in-oil compound drops impacting on a solid surface. Unexpectedly, the core water drop rebounds from the surface below a threshold impact velocity, irrespective of the substrate wettability. This is interpreted as the result of lubrication from the oil shell that prevents contact between the water core and the solid surface. We combine side and bottom view high-speed imaging to demonstrate the correlation between the water core rebound and the oil layer stability. A theoretical model is developed to explain the observed effect of compound drop geometry. This work sets the ground for precise complex drop deposition, with a strong impact on two- and three-dimensional printing technologies and liquid separation.
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Chen, Qiushui, Stefanie Utech, Dong Chen, Radivoje Prodanovic, Jin-Ming Lin, and David A. Weitz. "Controlled assembly of heterotypic cells in a core–shell scaffold: organ in a droplet." Lab on a Chip 16, no. 8 (2016): 1346–49. http://dx.doi.org/10.1039/c6lc00231e.

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Organ in a drop: we use droplet-based microfluidics to fabricate large-scale, monodisperse, portable micro organs, each in an individual drop. We spatially assemble hepatocytes and fibroblasts in a biocompatible core–shell scaffold, forming an artificial liver in each drop, and expressing enhanced liver-specific functions.
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Ahn, Yoolim, Yohwan Park, Jin Young Koo, and Hee Cheul Choi. "Crystallisation of organic molecules with a remarkably suppressed coffee-ring effect by a drop-drying process using binary solvent core–shell droplets." Molecular Systems Design & Engineering 3, no. 4 (2018): 604–8. http://dx.doi.org/10.1039/c8me00026c.

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Qin, Wei Wei, Martin E. Silvestre, and Matthias Franzreb. "Magnetic Microparticles@UiO-67 Core-Shell Composites as a Novel Stationary Phase for High Performance Liquid Chromatography." Applied Mechanics and Materials 703 (December 2014): 73–76. http://dx.doi.org/10.4028/www.scientific.net/amm.703.73.

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Metal-organic framework UiO-67 was explored as a novel stationary phase for high performance liquid chromatography (HPLC). UiO-67 was, for the first time, homogeneously coated on carboxyl functionalized magnetic silica microparticles at low temperature (45 °C) by using a recently introduced liquid phase epitaxy (LPE) process. HPLC runs using the synthesized core-shell microparticles as stationary phase showed baseline separation for three phenol derivatives, applying gradient elution using acetonitrile and water as mobile phase. It also showed that UiO-67 has the largest affinity for 2,6-dichlorophenol among the phenol derivatives tested. The comparison of core-shell microparticles with 20 and 55 layers, respectively, of UiO-67 grown on the magnetic silica core proof that the UiO-67 shell determines separation behavior. Therefore, the use of UiO-67 core-shell microparticles as a stationary phase combines the advantages of a thin, homogenous MOF shell showing fast kinetics and good separation efficiency with the advantages of spherical silica microparticle cores offering high mechanical robustness and moderate pressure drop.
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Gallagher, Samuel Hugh, Olivier Trussardi, Oliver Lipp, and Dominik Brühwiler. "Hollow Silica Cubes with Customizable Porosity." Materials 13, no. 11 (May 29, 2020): 2474. http://dx.doi.org/10.3390/ma13112474.

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Hollow silica cubes were synthesized by a deposition of a thin silica shell onto micrometer-sized hematite cubes. Ordered mesopores with well-defined pore diameters of 2.8 nm and 3.8 nm were introduced into the silica shell by means of pseudomorphic transformation after removal of the hematite core. The particles retained their cubic morphology upon pseudomorphic transformation, allowing for the preparation of close-packed layers of the hollow mesoporous silica cubes by drop-casting and the visualization of the hollow core by focused ion beam scanning electron microscopy.
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Yumozhapova, Natalia V., Andrey V. Nomoev, and Yuri Ya Gafner. "Computer Modeling of the Formation Process of Core-Shell Nanoparticles Cu@Si." Solid State Phenomena 271 (January 2018): 47–50. http://dx.doi.org/10.4028/www.scientific.net/ssp.271.47.

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The process of nanoparticle Cu@Si formation by the molecular dynamic method using MEAM-potentials was studied. Modeling the droplet behavior demonstrates that a core-shell structure with a copper core and a silicon shell can be formed if the drop is in the liquid state, until the material is finally redistributed. The parameters of thermal stability of Cu@Si composite nanoparticles of different sizes have been determined. It is concluded that as the temperature increases, the diffusion of copper atoms to the surface begins, which leads to a change in the structure and the formation of particles with a core of the Cu@Si type.
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Jiang, B., Y. D. Huang, and L. W. Zhao. "Diffusion process of an ink drop in core–shell silica–titania pigment particles." Materials & Design 92 (February 2016): 114–19. http://dx.doi.org/10.1016/j.matdes.2015.12.021.

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Mullis, Andrew M., Oluwatoyin E. Jegede, Timothy D. Bigg, and Robert F. Cochrane. "Dynamics of core–shell particle formation in drop-tube processed metastable monotectic alloys." Acta Materialia 188 (April 2020): 591–98. http://dx.doi.org/10.1016/j.actamat.2020.02.017.

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Dissertations / Theses on the topic "Core-shell drop"

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Sumaria, Kaushal. "Numerical Simulation of Multi-Phase Core-Shell Molten Metal Drop Oscillations." 2017. https://scholarworks.umass.edu/masters_theses_2/586.

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The surface tension of liquid metals is an important and scientifically interesting parameter which affects many metallurgical processes such as casting, welding and melt spinning. Conventional methods for measuring surface tension are difficult to use for molten metals above temperatures of 1000 K. Containerless methods are can be used to measure the surface tension of molten metals above 1000 K. Oscillating drop method is one such method where a levitated droplet is allowed to undergo damped oscillations. Using the Rayleigh’s theory for the oscillation of force-free inviscid spherical droplets, surface tension and viscosity of the sample can be calculated from oscillation frequency and damping respectively. In this thesis, a numerical model is developed in ANSYS Fluent to simulate the oscillations of the molten metal droplet. The Volume of Fluid approach is used for multiphase modelling. The effect of numerical schemes, mesh size, and initialization boundary conditions on the frequency of oscillation and the surface tension of the liquid are studied. The single-phase model predicts the surface tension of zirconium within a range of 13% when compared to the experimental data. The validated single phase model is extended to predict the interfacial tension of a core-shell structured compound drop. We study the effect of the core and shell orientation at the time of flow initialization. The numerical model we developed predicts the interfacial tension between copper and cobalt within the range of 6.5% when compared to the experimental data. The multiphase model fails to provide any conclusive data for interfacial tension between molten iron and slag.
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Book chapters on the topic "Core-shell drop"

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Vladisavljević, Goran T., Ho Cheung Shum, and David A. Weitz. "Control over the Shell Thickness of Core/Shell Drops in Three-Phase Glass Capillary Devices." In UK Colloids 2011, 115–18. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-28974-3_20.

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Conference papers on the topic "Core-shell drop"

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Chen, Yaping, Ruibing Cao, Jiafeng Wu, Cong Dong, and Yanjun Sheng. "Experimental Study on Shell Side Heat Transfer Performance of Circumferential Overlap Trisection Helical Baffle Heat Exchangers." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-63254.

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A set of experiments were conducted on the circumferential overlap trisection helical baffle heat exchangers with inclined angles of 20°, 24°, 28° and 32° single-thread and inclined angle of 32° dual-thread one, and a segmental baffle heat exchanger as a contrast scheme. The cylinder case of the testing heat exchanger is a common shell, while the tube bundle core could be replaced. The shell side heat transfer coefficient ho is obtained by subtract tube-side convection thermal resistance and tube wall conduction resistance from the overall heat transfer coefficient K. The curves of shell side heat transfer coefficient ho, pressure drop Δpo, Nusselt number Nuo, and axial Euler number Euz,o are presented versus axial Reynolds number Rez,o. A comprehensive performance index Nuo/Euz,o is suggested to demonstrate the integral properties of both heat transfer and flow resistance of different schemes, and the curves of Nuo/Euz,o versus Rez,o of the different schemes are presented. The results show that the scheme with inclined angle 20° performs better than other schemes, and the scheme with inclined angle 24° ranks the second, however the segment scheme ranks the last. The curves of Nuo/Euz,o of both schemes with inclined angle 32° of single-thread and dual-thread are almost coincident, even though their heat transfer coefficient and pressure drop curves are quite different. The results indicate also that for the circumferential overlap trisection helical baffle schemes the optimal inclined angle is around 20° instead of around 40° as rated by many literatures for the quadrant helical baffle schemes.
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Zhao, Lixin, Feng Li, Zhanzhao Ma, and Yanqing Hu. "Theoretical Analysis and Experimental Study of Dynamic Hydrocyclones." In ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2007. http://dx.doi.org/10.1115/omae2007-29076.

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Characteristics of dynamic hydrocyclonic separator are simply introduced. The advantages of dynamic hydrocyclones used as separators, such as wider applicable flowrate range and smaller cut size, etc., are analyzed compared with normal-used static hydrocyclones. By analyzing tangential and axial velocity field distributions inside hydrocyclones, the reason why dynamic hydrocyclone has higher efficiency than static one is further described. The laboratory experiments and field tests of dynamic hydrocyclones were carried out. Relationships of flowrate, outer shell rotation speed, and split ratio with pressure were studied. Pressure and pressure drop inside hydrocyclones were measured and analyzed. The effect of main operating parameters, such as split ratio and rotation speed, on hydrocyclonic separation performance was also studied. It is shown that the rise of split ratio is beneficial to enhancing separation efficiency, but the split ratio must be controlled in an appropriate range, so as to obtain satisfied separation result. The increase of rotation speed is helpful for the forming of oil core inside the hydrocyclone, but the resonating phenomenon should be avoided when using dynamic hydrocyclones. Field tests indicated satisfied results as anticipated.
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Bryan, Jacob A., Aiden S. Meek, and Hailei Wang. "Multi-Objective Optimization of a Bi-Metal High Temperature Recuperator for Application in Concentrating Solar Power." In ASME 2022 16th International Conference on Energy Sustainability collocated with the ASME 2022 Heat Transfer Summer Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/es2022-81388.

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Abstract In recent years, supercritical CO2 closed-cycle Brayton cycles have become a major candidate for future power cycle designs in concentrating solar power (CSP) applications, with many of these designs including partial recompression and regeneration to increase thermal efficiency. This increase in efficiency, combined with potential miniaturization of heat transfer equipment and turbomachinery, could help significantly decrease the cost of energy generated by CSP plants. The high-temperature recuperator in these designs plays an integral role in these cycles and must operate and high temperatures and pressures. Printed circuit heat exchangers (PCHEs) have become a leading technology for these recuperators due to their size advantage over traditional shell and tube heat exchangers. However, PCHEs for high-temperature recuperators often must be built from costly nickel alloys to accommodate the extreme operating conditions. One potential solution to this cost problem is to tailor the material of the heat exchanger body to its operating conditions, rather than needing to choose a single material. This could be accomplished by using additive manufacturing to create a multi-material unibody heat exchanger, with a high-performance nickel alloy being used only where temperature and pressure dictate its use. Specifically, powder bed fusion (PBF) would be used to create the low-temperature portion of the recuperator in stainless steel 316L, then the high temperature region would be added directly to the low-temperature portion in Inconel 625 using directed energy deposition (DED). This methodology would have the additional benefit of being able to manufacture the heat exchanger headers at the same time as the core. In this project, a 1-D model of such a heat exchanger is devised which models the variability of both fluid and solid properties. The design of the heat exchanger core is based on existing PCHE core designs. While optimizing the core design, a number of different channel shapes and fin configurations are considered. Arrays of airfoil fins appear to have comparable heat transfer performance with reduced pressure drop when compared to other core designs. A multi-objective optimization of a small-scale heat exchanger is then performed using the 1-D model in order to determine the dimensional parameters which simultaneously maximize the heat exchanger effectiveness and minimize its size. Two designs appear in the Pareto front resulting from this optimization. Analysis shows that the design with less heat transfer area achieves higher effectiveness by limiting axial conduction in the walls of the recuperator while also suffering much less pressure drop in both fluids.
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Hong, F. J., C. Y. Zhang, D. H. Chen, and G. Chen. "Confined Jet Array Impingement Cooling Using NEPCM Nanofluids." In ASME 2016 5th International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/mnhmt2016-6531.

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The confined jet array impingement cooling using NEPCM (nano-encapsulated phase change material) slurry was investigated numerically using a homogeneous model based on effective heat capacity method. The nanofluids consists of the carrier fluid of polyalphaolefin (PAO) and the NEPCM particles of Polystyrene shell and paraffin core. The distributed slot jet array with the jet width W=100 μm, confinement height H=300 μm, jet-to-jet distance S=400 μm was investigated at first under different jet velocity, inlet temperature and NEPCM volumetric concentration. It was found that for a fixed jet velocity, there is an optimal NEPCM volumetric concentration and an optimal inlet temperature to achieve the maximum average heat transfer coefficient. The larger the jet velocity, the higher the optimal NEPCM concentration and the closer the optimal inlet temperature to the midpoint of melting temperature range of PCM where the peak of effective heat capacity achieves. The local heat transfer on the heating surface under the exit slot is the weakest, because of stagnant zone formed by the head-to-head collision of the two adjacent jets. The pressure drop and average heat transfer coefficient of six jet arrays with different H/W (=2, or 3) and S/W (=3, 4 or 5) were also compared.
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Zhen, Huang, Yang Bo, Li Guoying, Ren Jian, and Wang Xiaoling. "The Model of Sandbody Controlled by Dynamic Provenance System and its Exploration Significance in Superposition Area of Strike-Slip and Extension Stress in the South of Bohai Sea." In International Petroleum Technology Conference. IPTC, 2021. http://dx.doi.org/10.2523/iptc-21192-ms.

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Abstract Laizhouwan sag in Bohai Bay basin is a fault basin controlled by extensional fault depression and strike slip pull apart, which is an important oil and gas exploration area in Bohai Bay. Exploration practice shows that the prediction of high quality reservoir is the core problem of exploration in this area. Based on the analysis of drilling, seismic data and structural physical simulation in Laizhouwan depression, this paper analyzes the structural deformation under the stress field of strike slip extensional superposition, and points out the dynamic source controlled sand model in the strike slip extensional superposition area. Firstly, The structural response of "pressure relief settlement, pressure boosting uplift" under the mechanism of strike slip extension stress superposition stress is the root cause of block uplift drop alternation transformation. As a result, the southern slope zone of Laizhouwan depression shows the structural pattern of early uplift and late uplift in the East and early uplift and late uplift in the west, forming a "seesaw" structural evolution pattern. Secondly, the unique paleogeomorphology controls the orderly distribution of sedimentary system in time and space. In the Paleocene, the east uplifted, forming a local provenance system. In the denudation area above the slope break developed fracture weathering shell type reservoirs, and the subsidence area under the slope break developed fan delta deposits; In the early Eocene, the relatively flat platform palaeogeomorphology was developed, which created favorable conditions for the development of mixed sedimentary body of lacustrine carbonate and delta; At the end of Eocene, the West was pressurized and uplifted, the East was released and subsided, and the braided river delta sediments of Western provenance were developed. Under the guidance of this recognition, the hidden dynamic provenance was successfully identified in the study area.
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Benato, Alberto, Leonardo Pierobon, Fredrik Haglind, and Anna Stoppato. "Dynamic Performance of a Combined Gas Turbine and Air Bottoming Cycle Plant for Off-Shore Applications." In ASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/esda2014-20105.

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When the Norwegian government introduced the CO2 tax for hydrocarbon fuels, the challenge became to improve the performance of off-shore power systems. An oil and gas platform typically operates on an island (stand-alone system) and the power demand is covered by two or more gas turbines. In order to improve the plant performance, a bottoming cycle unit can be added to the gas turbine topping module, thus constituting a combined cycle plant. This paper aims at developing and testing the numerical model simulating the part-load and dynamic behavior of a novel power system, composed of two gas turbines and a combined gas turbine coupled with an air bottoming cycle plant. The case study is the Draugen off-shore oil and gas platform, located in the North Sea, Norway. The normal electricity demand is 19 MW, currently covered by two gas turbines generating each 50% of the power demand, while the third turbine is on stand-by. During oil export operations the power demand increases up to 25 MW. The model of the new power plant proposed in this work is developed in the Modelica language using basic components acquired from ThermoPower, a library for power plant modelling. The dynamic model of the gas turbine and the air bottoming cycle turbogenerator includes dynamic equations for the combustion chamber, the shell-and-tube recuperator and the turbine shafts. Turbines are modelled by the Stodola equation and by a correlation between the isentropic efficiency and the non-dimensional flow coefficient. Compressors are modelled using quasi steady-state conditions by scaling the maps of axial compressors employing a similar design point. The recuperator, which recovers the exhaust heat from the gas turbine, is modelled using correlations relating the heat transfer coefficient and the pressure drop at part-load with the mass flow rate. Thermodynamic variables and dynamic metrics, such as the rise time and the frequency undershooting/ overshooting, are predicted. Considering a load ramp of 0.5 MW/s, an undershooting of 4.9% and an overshooting of 3.0% are estimated. The rise time is approximately 30 s. Moreover, findings suggest that decreasing the core weight of the recuperator leads to limiting the frequency fluctuations, thus minimizing the risk of failure of the power system.
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Rokni, Houman B., Ehsan M. Languri, and Wayne Johnson. "Convective Electronic Device Cooling Using Microencapsulated Phase Change Material Slurry in Planar Spiral Coil." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-52748.

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The current trend in miniaturization of electronic devises requires more effective thermal management techniques to remove the heat to ensure the maximum performance of the devise. Among all available thermal management techniques for electronic cooling, convective heat transfer cooling has gained attentions due to low cost and maturity in the market. The single-phase convective heat removal technique suffers from the low heat carrying capacity since there is no phase change occurs during the process. On the other hand, Microencapsulated phase change materials (MPCMs) are gaining attention due to their high heat carrying capacity. MPCMs are composed of phase change material (PCM) as the core material that is encapsulated with micrometer size shell materials. The PCM inside the capsules may undergo a phase change as the temperature varies around the melting and freezing temperature points of the PCM. This leads to a significant heat gain/release due to the phase change of the PCM. In this paper, we are performing a numerical modeling on the performance of MPCMs mixed with single-phase base fluid when pumped through planar spiral coils. From electronic thermal management point of view, it is ideal to have an enhanced coolant that maintain the operating temperature under an allowable level uniformly. The behavior of MPCM slurry when pumped through planar spiral coils reveals unique patterns due to the centrifugal forces. The available data on MPCM slurry through spiral coil heat exchangers show the new patterns of velocity and heat transfer curves that require further investigation and scientific explanations. The current paper studies the steady conditions of flows under laminar regimes at different boundary conditions. A CAD model of a planar coil heat exchanger is developed in SolidWorks. The model is meshed and discretized in order to apply the governing equations into the model. ANSYS Fluent package is used to solve the fluid flow and heat transfer equations inside the geometry. The velocity and temperature profiles along the coil are studied and discussed to quantify the roles of different forces in such flows. The ultimate goal of this study to evaluate the efficacy of utilizing such formulated microencapsulated PCM slurry at different mass concentrations on electronic thermal management considering the cost associated to the added pressure drop when using MPCM slurry.
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