Keywords: cooling, mass fraction, cooling rate, Na2CO3, temperature, high temperature,

　　The relationship between the cooling capacity of the sodium carbonate aqueous solution (mass fraction) at 20°C and its concentration is shown in the figure. It can be seen from the figure that the maximum cooling rate of 5% Na2CO3 aqueous solution is about 1700 ℃/s, the corresponding temperature is about 450 ℃, and the characteristic temperature is about 700 ℃. The cooling rate in the high temperature zone of 10% ~ 20% Na2C03 aqueous solution is slow, and the cooling rate is the fastest at about 300 ℃, about 500 ℃/s.

Fig.20 Relationship between cooling capacity of sodium carbonate aqueous solution (mass fraction) and its concentration
(Φ20mm silver ball specimen)(15% and 10% curves are very close)

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