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首页> 外文期刊>International Journal of Heat and Mass Transfer >Thermal performance of microencapsulated phase change material slurry in turbulent flow under constant heat flux
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Thermal performance of microencapsulated phase change material slurry in turbulent flow under constant heat flux

机译：恒定热通量下微胶囊相变材料浆料在湍流中的热性能

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摘要

Current cooling and heating distribution systems that use water as secondary fluid exhibit limited thermal capacity which can only be overcome by high flow rates and large (volume) capacity. A successful way to enhance the thermal capacity of secondary fluid systems is by incorporating microencapsulated phase change material (MPCM) slurry. However, a full understanding of the physical properties and heat transfer characteristics of MPCM slurry in the 2-8℃ range (35.5-46.5℉) still is lacking. In the paper, latent heat of fusion, melting and freezing points, and temperature- and concentration-dependent viscosity data, are presented. Results indicate that selection of nucleating agent type and concentration is required to prevent the supercooling phenomenon. Pressure drop and convective heat transfer data were measured using a heat transfer loop operated at different flow rates and heat flux values. Results indicate that the phase change process and slurry mass fraction affect the heat transfer process. The paper also examines the impact of using enhanced surface tubing in combination with MPCM slurry under constant heat flux and turbulent conditions.
机译：当前使用水作为二次流体的冷却和加热分配系统显示出有限的热容量，这只能通过高流速和大（体积）容量来克服。增强二次流体系统热容量的成功方法是掺入微囊化相变材料（MPCM）浆料。但是，仍然缺乏对MPCM浆料在2-8℃（35.5-46.5℉）范围内的物理性质和传热特性的全面了解。在本文中，介绍了熔化潜热，熔点和凝固点以及温度和浓度相关的粘度数据。结果表明需要选择成核剂的类型和浓度来防止过冷现象。使用在不同流速和热通量值下运行的传热回路测量压降和对流传热数据。结果表明，相变过程和浆料质量分数会影响传热过程。本文还研究了在恒定热通量和湍流条件下，结合使用增强型表面管和MPCM浆料的影响。

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