EXPERIMENTAL INVESTIGATION ON DISCHARGING PERFORMANCES OF SUPERCOOLED SAT-STP MIXTURE TRIGGERED BY MAGNETIC FRICTION

Qu Guanglei; Zhou Guobing; Li Can

doi:10.19912/j.0254-0096.tynxb.2024-2267

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (5) : 450-456. DOI: 10.19912/j.0254-0096.tynxb.2024-2267

EXPERIMENTAL INVESTIGATION ON DISCHARGING PERFORMANCES OF SUPERCOOLED SAT-STP MIXTURE TRIGGERED BY MAGNETIC FRICTION

Qu Guanglei, Zhou Guobing, Li Can

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Abstract

A magnetic friction triggering device is proposed and designed. The principle is to exert a magnetic field onto two steel balls placed in supercooled hydrated salt with a rotating magnet. The two steel balls will twist around the contact point, and the friction between the steel balls leads to crystallization of supercooled hydrated salt. By measuring induction period and discharging temperature, the effects of different magnetic induction intensities, motor rotation speed and different proportions of sodium acetate trihydrate （SAT） and sodium thiosulfate pentahydrate （STP） on the discharging performances of the binary system （SAT-STP） were examined. The results show that magnetic friction is a simple, rapid and effective triggering method. The greater the magnetic induction intensity is, the shorter is the induction period. The method can activate the crystallization of supercooled SAT-STP within 2 min. With the increase of the STP content in the SAT-STP sample, the mixture viscosity increases, then the induction period becomes longer, and the magnetic friction triggering device cannot even trigger the sample with the ratio of 75：25. Changing rotation speed has little effect on triggering SAT crystallization and heat release.

Key words

triggering crystallization / binary mixture / stable supercooling / magnetic friction / sodium acetate trihydrate / sodium thiosulfate pentahydrate

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Qu Guanglei, Zhou Guobing, Li Can. EXPERIMENTAL INVESTIGATION ON DISCHARGING PERFORMANCES OF SUPERCOOLED SAT-STP MIXTURE TRIGGERED BY MAGNETIC FRICTION[J]. Acta Energiae Solaris Sinica. 2026, 47(5): 450-456 https://doi.org/10.19912/j.0254-0096.tynxb.2024-2267

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