A Study of Electric Field Effect on Melting of Octadecane

A new approach is developed to study melting kinetics of n-Octadecane. Modelling of heat transfer during the melting of solid particle is described. The calculation results are in good agreement with experimental data on melting duration. The effect of applied electric field on melting kinetics is studied. Almost twofold increase of melting time is found in an electric field of strength E = 82 kv/m. In addition a rotation of a solid core inside a melt is observed, which is a manifestation of Quinke effect. A droplet shape evolution during phase transition is described. It is shown that initially elongated particle is almost spherical near the melting point and elongates again with the temperature rise. This shape evolution is explained by non-monotonous change of surface tension and is connected with rotational phase. Thus a possibility is shown to control a melting rate of normal alkanes using electric field.

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Experimental and Theoretical Study on Melting Kinetics of Spherical Aluminum Particles in Liquid Aluminum

MRS Proceedings ◽

10.1557/opl.2015.820 ◽

2015 ◽

Vol 1765 ◽

pp. 139-144

Author(s):

Marco Ramírez-Argáez ◽

Enrique Jardón ◽

Carlos González-Rivera

Keyword(s):

Heat Transfer ◽

Mathematical Model ◽

Heat Transfer Coefficient ◽

Process Analysis ◽

Convective Heat Transfer Coefficient ◽

Melting Process ◽

Solid Particles ◽

Melting Time ◽

Melting Kinetics ◽

Kinetics Of

ABSTRACTIn this study a process analysis of the melting process of solid particles in a bath of same composition is performed using both experimental information and theoretical computations. An experimental setup was used to measure the thermal histories and to follow the evolution with time of the size of solid metallic spherical particles being melted in a metallic bath of same composition. For such a purpose, pure aluminum was used during the experiments for both solid particles and liquid bath. A mathematical model was also developed based on first principles of heat transfer to simulate the melting kinetics of a cold metallic spherical particle immersed in a hot liquid bath of same composition. The mathematical model was reasonably validated when compared against the experimental results obtained in this work. A process analysis of the melting process was performed to determine the effect of the initial temperature and size of the solid particle, the bath temperature and the convective heat transfer coefficient on the melting time and on the energy consumption.The analysis showed that the variable presenting the most significant effect on both the melting time and the energy consumption is the convective heat transfer coefficient between the particle and the bath, since an increment in such a parameter accelerates the melting process and saves energy. Therefore, proper stirring of the bath is highly recommended to enhance the melting of metallic alloying additions in the metallic baths.

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Electric Field Interaction with Hydrocarbon Flames

Ukrainian Journal of Physics ◽

10.15407/ujpe63.5.402 ◽

2018 ◽

Vol 63 (5) ◽

pp. 402

Author(s):

S. G. Orlovskaya ◽

M. S. Skoropado ◽

F. F. Karimova ◽

V. Ya. Chernyak ◽

L. Yu. Vergun

Keyword(s):

Melting Point ◽

Field Strength ◽

Electric Field ◽

Fossil Fuels ◽

Melting Process ◽

Melting Rate ◽

Melting Time ◽

Field Interaction ◽

Hydrocarbon Flames ◽

Dc Electric Field

The problem of electric-field-assisted combustion for low-melting point hydrocarbons (paraffin wax, n-alkanes) attracts the attention of scientists in relation to the development of paraffin-based propellants. Our study is aimed at the detailed investigation of the dc electric field interaction with the flame of octadecane droplet. We have studied the melting and combustion of alkane particles in the electric field ranging from 33 kV/m to 117 kV/m. It is found that the melting rate decreases distinctly starting with the electric field strength E ∼ 80 kV/m. This effect is more pronounced at high gas temperatures (Ste >1), when the melting time is about a few seconds. So, the melting process slows down in the dc electric field. At the same time, the burning rate constant rises by more than 10 percents. The obtained results can be used to develop efficient and clean technologies of fossil fuels combustion.

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Coarse-grained molecular simulations of the melting kinetics of small unilamellar vesicles

Soft Matter ◽

10.1039/c5sm02560e ◽

2016 ◽

Vol 12 (6) ◽

pp. 1765-1777 ◽

Cited By ~ 10

Author(s):

Lara A. Patel ◽

James T. Kindt

Keyword(s):

Dominant Role ◽

Molecular Simulations ◽

Lipid Vesicles ◽

Melting Rate ◽

Coarse Grained ◽

Unilamellar Vesicles ◽

Melting Kinetics ◽

Temperature Jumps ◽

Small Unilamellar Vesicles ◽

Kinetics Of

Frozen lipid vesicles simulated using a coarse-grained potential and subject to temperature jumps respond by melting on timescales similar to those observed experimentally; changes in curvature stress appear to play a dominant role in controlling the melting rate.

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Convective Heat Transfer During Melting in a Solar LHTES

Engineering, Technology & Applied Science Research ◽

10.48084/etasr.4165 ◽

2021 ◽

Vol 11 (3) ◽

pp. 7181-7186

Author(s):

F. Z. Mecieb ◽

F. García Bermejo ◽

J. P. Solano Fernández ◽

S. Laouedj

Keyword(s):

Heat Transfer ◽

Natural Convection ◽

Melting Rate ◽

Melting Time ◽

Heat Sources ◽

Stored Energy ◽

Numerical Investigations ◽

Coupling Strategy ◽

Kinetics Of ◽

Change Material

Melting combined with natural convection in a shell and Latent Thermal Energy Storage (LHTES) tube driven by a solar collector was analyzed numerically in the present work. This work's particularity lies in the fact that the HTF temperature varies at each moment following the solar irradiance curve. A program (UDF) has been developed and integrated into Ansys to meet this requirement. The use of this coupling strategy allows obtaining realistic unsteady LHTES results. Several numerical investigations were carried out to analyze the effect of the heat sources' power on the accumulator's performance. The obtained results show that natural convection considerably influences the heat transfer as well as the melting kinetics of the Phase Change Material (PCM). Besides, the results show that increasing the heat transfer fluid's thermal load can increase the melting rate of the PCM and the stored energy and reduce the entire melting time.

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Numerical Simulation of Melting Kinetics of Metal Particles during Tapping with Argon-Bottom Stirring

Crystals ◽

10.3390/cryst10100901 ◽

2020 ◽

Vol 10 (10) ◽

pp. 901

Author(s):

Kinnor Chattopadhyay ◽

Rodolfo Morales-Davila ◽

Alfonso Nájera-Bastida ◽

Jafeth Rodríguez-Ávila ◽

Carlos Rodrigo Muñiz-Valdés

Keyword(s):

Room Temperature ◽

Melting Furnace ◽

Melting Process ◽

Melting Rate ◽

Metal Particles ◽

Melting Kinetics ◽

Nickel Particles ◽

Filling Time ◽

The Impact ◽

Kinetics Of

Molten steel is alloyed during tapping from the melting furnace to the argon-bottom stirred ladle. The metallic additions thrown to the ladle during the ladle filling time are at room temperature. The melting rates or kinetics of sinking-metals, like nickel, are simulated through a multiphase Euler–Lagrangian mathematical model during this operation. The melting rate of a metallic particle depends on its trajectory within regions of the melt with high or low turbulence levels, delaying or speeding up their melting process. At low steel levels in the ladle, the melting rates are higher on the opposite side of the plume zone induced by the bottom gas stirring. This effect is due to its deviation after the impact of the impinging jet on the ladle bottom. The higher melting kinetics are located on both sides at high steel levels due to the more extensive recirculation flows formed in taller baths. Making the additions above the eye of the argon plume spout increases the melting rate of nickel particles. The increase of the superheat makes the heat flux more significant from the melt to the particle, increasing its melting rate. At higher superheats, the melting kinetics become less dependent on the fluid dynamics of the melt.

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