Abstract:Measurements are carried out for dendrite tip growth of succinonitrile-acetone alloys solidifying freely in an undercooled melt. The current experimental investigation is conducted using the equiaxed dendritic solidification experiment (EDSE). This setup allows for precise measurements of the dendrite tip velocity, radius and shape for a range of undercoolings and solute concentrations. The collected data are compared to available theories of free dendritic growth, such as the Lipton-Glicksman-Kurz and Li-Beck… Show more
“…Figures 5–9 compare experimental data presented by Shibkov et al [27], Yokoyama et al [28] and Yoshizaki et al [29] on ice dendrites, Ramirez [30] on free dendritic growth in succinonitrile–acetone alloys and Huang & Wang [31] on succinonitrile dendrites under terrestrial conditions as well as the analytical tip shape for 3D crystals. Here we illustrate the shape function (4.1), where zAGfalse(xfalse) is taken from the corresponding law (2.6) for 3D crystals.…”
Section: A Test Of Theory With Computations and Experimentsmentioning
confidence: 89%
“…(Online version in colour. )Figure 8Experimental data [30] are compared with theoretical predictions for 3D dendrites (α=15). ( a , b ) The general view of dendrite ( a ) and our comparison ( b ).…”
Section: A Test Of Theory With Computations and Experimentsmentioning
This article is devoted to the study of the tip shape of dendritic crystals grown from a supercooled liquid. The recently developed theory (Alexandrov & Galenko 2020
Phil. Trans. R. Soc. A
378
, 20190243. (
doi:10.1098/rsta.2019.0243
)), which defines the shape function of dendrites, was tested against computational simulations and experimental data. For a detailed comparison, we performed calculations using two computational methods (phase-field and enthalpy-based methods), and also made a comparison with experimental data from various research groups. As a result, it is shown that the recently found shape function describes the tip region of dendritic crystals (at the crystal vertex and some distance from it) well.
This article is part of the theme issue ‘Transport phenomena in complex systems (part 1)’.
“…Figures 5–9 compare experimental data presented by Shibkov et al [27], Yokoyama et al [28] and Yoshizaki et al [29] on ice dendrites, Ramirez [30] on free dendritic growth in succinonitrile–acetone alloys and Huang & Wang [31] on succinonitrile dendrites under terrestrial conditions as well as the analytical tip shape for 3D crystals. Here we illustrate the shape function (4.1), where zAGfalse(xfalse) is taken from the corresponding law (2.6) for 3D crystals.…”
Section: A Test Of Theory With Computations and Experimentsmentioning
confidence: 89%
“…(Online version in colour. )Figure 8Experimental data [30] are compared with theoretical predictions for 3D dendrites (α=15). ( a , b ) The general view of dendrite ( a ) and our comparison ( b ).…”
Section: A Test Of Theory With Computations and Experimentsmentioning
This article is devoted to the study of the tip shape of dendritic crystals grown from a supercooled liquid. The recently developed theory (Alexandrov & Galenko 2020
Phil. Trans. R. Soc. A
378
, 20190243. (
doi:10.1098/rsta.2019.0243
)), which defines the shape function of dendrites, was tested against computational simulations and experimental data. For a detailed comparison, we performed calculations using two computational methods (phase-field and enthalpy-based methods), and also made a comparison with experimental data from various research groups. As a result, it is shown that the recently found shape function describes the tip region of dendritic crystals (at the crystal vertex and some distance from it) well.
This article is part of the theme issue ‘Transport phenomena in complex systems (part 1)’.
“…Ammonium chloride was used extensively in modeling metal solidification because it solidifies like metals, and the liquid melt has the advantage of being transparent. − Its melting temperature range is considerably lower that metal’s melting temperature, making the operating conditions much easier for experimental studies in the laboratory. Other metal analogue alloys were used in modeling solidification, such as SCN (succinonitrile), − NPG-TRIS, − or NaCl. , …”
Ammonium chloride is commonly used as a buffer solution to control pH levels in a wide variety of chemical and medical applications and is also used as a fertilizer because it acts as a sufficient source of nitrogen for the soil. More recently it is used to create an experimental benchmark, useful to model/simulate metal solidification. In electronics and metallurgy it is also used for cleaning, to prevent the formation of oxides during welding or smelting of metals. In the literature different values are available for the thermo-physical parameters and in the current paper an overview of measured or calculated values of the most important properties is presented. For an ammonium chloride−water solution different phase diagrams are accessible, and the calculation of the liquidus and solidus line is completed. A comparison of calculated heat capacity values for ammonium chloride is made with the literature values. Measured data for the ammonium chloride density are available in the literature, and the values for different temperatures and concentrations are presented here. Thermal conductivity values are gathered in the present work. The viscosity can be estimated in between 283 and 333 K and for mass fraction up to 0.324 kg•kg −1 , with a model for the calculation of the aqueous solutions viscosity, based on the viscosity of solute and water. The variation curve of diffusivity values with the concentration, exists only for 293 and 298 K. For this reason an approximation with NH 3 diffusivity values, which are measured for different temperatures and concentrations, can be recommended. Additional analysis of two experimental measurements, performed in order to estimate the ammonium chloride diffusivity in water and further extract the Gibbs−Thomson coefficient, is done.
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