Kinetics of melt crystallization of organic eutectic forming binary mixtures in non-flow systems
Abstract: The kinetics of melt crystallization of binary eutectic forming organic mixtures in non-flow systems with cooling from below for the preferential crystallization of one component alone have been studied experimentally. The effect of subcooling, superheating and the initial concentration of the melt on the crystallization kinetics have been studied. Based on the experimental data, a correlation for the instantaneous height of the crystal (volume fraction of the solidified mass) has been proposed. The experimental results were also analyzed based on a model from the literature, which considered simultaneous heat and mass transport. The analysis shows that in the present experiments, the melt crystal interface was very close to the initial melt composition, i.e. concentration equilibrium was maintained. This is attributed to the very low cooling rates used, even though the thermal diffusivity is much greater than the mass diffusivity of the melt.
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Cites background from "Kinetics of melt crystallization of..."
...According to Radhakrishnan and Balakrishnan [3], the basic characteristic of PFC process is normally described by the rate of crystal growth, in which this rate is mainly determined by heat and mass transfer at solid-liquid interface....
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References
438 citations
"Kinetics of melt crystallization of..." refers background or methods in this paper
...The correlation has also been compared with the data of Hale and Viskanta [4], who studied the freezing and melting of n-octodecane in a rectangular enclosure (again with Ste*=0 and C0%=0) with slightly better agreement than with the data of Gau and Viskanta [7]....
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...Gau and Viskanta’s [8] experimental data on the solidification of pure gallium on a vertical wall with initial superheat is also shown in Fig....
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...In using the data of Gau and Viskanta [8] with the present...
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...In using the data of Gau and Viskanta [8] with the present correlation, C0% is set equal to 0 (pure substance)....
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...Gau and Viskanta’s [7] experimental data on the solidification of Lipowitz metal (an alloy of Bi, Pb, Sn and Cd) in a rectangular enclosure with no initial superheat and at its eutectic composition (Ste*=0 and Co%=0) is shown in Fig....
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272 citations
"Kinetics of melt crystallization of..." refers background in this paper
...Huppert and Worster [9] stated that the crystal layer height varied with the square root of the growth time....
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...The parameter g is given by Huppert and Worster [9] as cC0 F(g) 1−F(g) n rmCpm F(emg) + rsCps G(esg) n = rsCps(Tl(C0)−Tw) G(esg) − rmCpm(T0−Tl(C0)) F(emg) (24) where, F(x)=P1/2xex2erfc(x) (25) and G(x)=P1/2xex2erfc(x) (26) The interface concentration is obtained from the following equation F(g)= Ci−C0 C0 (27) and subsequently the interface temperature is obtained from the phase diagram....
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...Worster [5] defined a criterion to avoid supercooling and subsequent linear instabilities at the interface (i.e. non-flat and non-planar interface) ks\ km 1− [1− (l/jCps)(D/as)(1/C0)] (2) where, j is the slope of the liquidus line and C0 is the initial composition of the melt....
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...Furthermore, Worster [5] has pointed out that the bulk temperature and the solute fields are statistically stable to convective motion if the system is cooled at the lower horizontal boundary and if the less dense component is crystallized....
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...In order to use the above solutions due to Huppert and Worster [9], the parameter g was determined from Eq....
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183 citations
"Kinetics of melt crystallization of..." refers background or methods in this paper
...Huppert and Worster [9] stated that the crystal layer height varied with the square root of the growth time....
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...The interface concentration is obtained from an equation due to Huppert and Worster [9] for (D/a) 1 and is given by 1+ cC0 (Tl(C0)− Tw) n−1 = Ci−C0 C0 (10)...
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...The parameter g is given by Huppert and Worster [9] as cC0 F(g)...
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...In order to use the above solutions due to Huppert and Worster [9], the parameter g was determined from Eq....
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...Huppert and Worster [9] solved these equations and the results are...
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109 citations
"Kinetics of melt crystallization of..." refers background or result in this paper
...The correlation has also been compared with the data of Hale and Viskanta [4], who studied the freezing and melting of n-octodecane in a rectangular enclosure (again with Ste*=0 and C0%=0) with slightly better agreement than with the data of Gau and Viskanta [7]....
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...4 between the present data and the data of Hale and Viskanta [4]....
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...Gau and Viskanta’s [8] experimental data on the solidification of pure gallium on a vertical wall with initial superheat is also shown in Fig....
[...]
...The correlation has also been compared with the data of Hale and Viskanta [4], who studied the freezing and melting of n-octodecane in a rectangular enclosure (again with Ste*=0 and C0 %=0) with slightly better agreement than with the data of Gau and Viskanta [7]....
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...In using the data of Gau and Viskanta [8] with the present correlation, C0% is set equal to 0 (pure substance)....
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104 citations
"Kinetics of melt crystallization of..." refers result in this paper
...These were compared with the data of Hale and Viskanta [ 4 ], whose experiments were conducted using n-octadecane....
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...Good agreement can be observed in Fig. 4 between the present data and the data of Hale and Viskanta [ 4 ]....
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...The correlation has also been compared with the data of Hale and Viskanta [ 4 ], who studied the freezing and melting of n-octodecane in a rectangular enclosure (again with Ste* 0 and C 0% 0) with slightly better agreement than with the data of Gau and Viskanta [7]....
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