四元溴化盐熔体表面张力特性

doi:10.11949/j.issn.0438-1157.20150168

化工学报 ›› 2015, Vol. 66 ›› Issue (10): 3820-3825.DOI: 10.11949/j.issn.0438-1157.20150168

四元溴化盐熔体表面张力特性

史建峰¹, 熊亚选¹, 吴玉庭², 李德英¹, 孟强², 马重芳², 陈红兵¹

1 北京建筑大学供热供燃气通风及空调工程北京市重点实验室, 北京 100044;
2 北京工业大学传热强化与过程节能教育部重点实验室及传热与能源利用北京市重点实验室, 北京 100124

收稿日期:2015-02-02 修回日期:2015-06-30 出版日期:2015-10-05 发布日期:2015-10-05
通讯作者: 吴玉庭
基金资助:
国家自然科学基金项目(51206004);北京市自然科学基金重点项目(3151001);北京市科技新星项目(2011029)。

Surface tension of quaternary bromide salts

SHI Jianfeng¹, XIONG Yaxuan¹, WU Yuting², LI Deying¹, MENG Qiang², MA Chongfang², CHEN Hongbing¹

1 Beijing Key Laboratory of Heating, Gas Supply, Ventilation and Air Conditioning, Beijing University of Civil Engineering and Architecture, Beijing 100044, China;
2 Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Ministry of Education, Key Laboratory of Heat Transfer and Energy Conversion of Beijing Municipality, Beijing University of Technology, Beijing 100124, China

Received:2015-02-02 Revised:2015-06-30 Online:2015-10-05 Published:2015-10-05
Supported by:
supported by the National Natural Science Foundation of China (51206004), the Key Project of Natural Science Foundation of Beijing (3151001) and the Beijing Science and Technology New Star Project (2011029).

摘要/Abstract

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。

关键词: 拉脱法, 表面张力, 实验验证, 四元溴化盐, 传热

Abstract:

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 Noüy ring method. Instrument coefficient was calibrated with chemically pure LiNO₃. By measuring surface tensions of NaNO₃ and 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.

Key words: pulling escape method, surface tension, experimental validation, quaternary bromide salt, heat transfer

中图分类号:

TK124

史建峰, 熊亚选, 吴玉庭, 李德英, 孟强, 马重芳, 陈红兵. 四元溴化盐熔体表面张力特性[J]. 化工学报, 2015, 66(10): 3820-3825.

SHI Jianfeng, XIONG Yaxuan, WU Yuting, LI Deying, MENG Qiang, MA Chongfang, CHEN Hongbing. Surface tension of quaternary bromide salts[J]. CIESC Journal, 2015, 66(10): 3820-3825.

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四元溴化盐熔体表面张力特性

Surface tension of quaternary bromide salts

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