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首页> 外文期刊>International Journal of Heat and Mass Transfer >Ammonium alum hydrate slurries with surfactants and polyvinyl alcohol as a latent heat transportation material for high temperature
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Ammonium alum hydrate slurries with surfactants and polyvinyl alcohol as a latent heat transportation material for high temperature

机译：以表面活性剂和聚乙烯醇为潜在的高温传热材料的铵铝水合物浆料

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Ammonium alum hydrate is a promising material for a latent heat transportation system for higher temperature around 50 degrees C. However, there were two big problems to be solved. One is a low fluidity of the slurries due to increasing the viscosity; the other is a sedimentation of phase changed ammonium alum hydrate particles in the slurry due to high density of the particle, which causes pipe blockage. In this study, in order to solve these problems, we added drag reducing surfactants and polyvinyl alcohol (PVA) to the ammonium alum hydrate solution, and investigated the effects of them. Particle growth and sedimentation of ammonium alum in the solution were prohibited by adding both surfactants and PVA. Addition of only PVA to ammonium alum solution didn't prevent the particle growth and the sedimentation. That is, the effect was a synergetic effect. In order to understand the synergetic effect, inner structures of a solution containing surfactants and PVA were measured by a dynamic light scattering (DLS). Flow and heat transfer characteristics were also measured and analyzed. Friction coefficients of solutions and slurries were decreased with the drag reducing surfactants, which was not affected by addition of PVA. Heat transfer characteristics of ammonium alum hydrate slurries were higher than that of solution with surfactants and PVA. All the results confirmed the applicability of the ammonium alum hydrate slurries for the high temperature latent heat transportation systems. (C) 2018 Elsevier Ltd. All rights reserved.
机译：水合铝酸铵是潜在的热传输系统材料，可用于约50摄氏度左右的高温。但是，有两个大问题需要解决。一种是由于粘度增加而导致的浆料的低流动性。另一种是由于颗粒的高密度而使相变铵铝水合物颗粒在浆液中沉淀，这导致管道堵塞。在本研究中，为了解决这些问题，我们在水合铵铝溶液中添加了减阻表面活性剂和聚乙烯醇（PVA），并研究了它们的作用。通过同时添加表面活性剂和PVA，禁止铵明矾在颗粒中的生长和沉淀。在铵明矾溶液中仅添加PVA并不能防止颗粒的生长和沉降。即，该效果是协同效果。为了理解协同作用，通过动态光散射（DLS）测量了含有表面活性剂和PVA的溶液的内部结构。还测量并分析了流动和传热特性。减阻表面活性剂降低了溶液和浆液的摩擦系数，这不受添加PVA的影响。铵水合氧化铝浆料的传热特性高于表面活性剂和PVA溶液的传热特性。所有的结果证实了铵铝水合物浆料在高温潜热传输系统中的适用性。 （C）2018 Elsevier Ltd.保留所有权利。

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