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中文摘要：
表面张力的大小直接决定着熔盐的热传输能力。基于拉脱法测量表面张力的原理,改进了测量高温熔盐表面张力的实验系统;以化学纯LiNO3进行标定获得了仪器系数,然后分别以NaNO3和Solar salt混合盐验证了实验系统和拉脱法测量高温熔盐表面张力的可靠性。在此基础上,以KBr、LiBr、NaBr、CaBr2为基础配制了4种不同组分的混合溴化盐,测量了4种混合溴化盐在不同温度下熔体的表面张力,拟合得到了4种混合溴化盐表面张力随温度变化的实验关联式。实验结果表明4种混合溴化盐的表面张力随温度升高呈线性下降,与已知熔体表面张力随温度变化规律一致。
英文摘要：
Surface tension is one of the most important factors directly determining transmission capability of heat. An experimental system was improved to measure surface tension of high temperature molten liquid with pulling escape method derived from the du No＆#252;y ring method. Instrument coefficient was calibrated with chemically pure LiNO3. By measuring surface tensions of NaNO3and Solar salt （60% NaNO3, 40% KNO3, mass fraction）, reliability of experimental system and method was validated. On this basis, four samples of quaternary bromide salts from KBr, LiBr, NaBr and CaBr2 were made with different mass ratios. Surface tensions of samples were measured with the experimental system in the temperature range 350—500℃ and fitted as functions of temperature. The results indicate that surface tension values of quaternary bromide salts diminish linearly with increasing temperature, in accord with surface tension change of known molten liquids.
同期刊论文项目
同项目期刊论文
Temperature distribution and heat loss experiments of low melting point molten salt heat storage tan
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