...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Science and Technology for the Built Environment >Thermodynamic properties of Al2O3 nanolubricants: Part 1-Effects on the two-phase pressure drop
【24h】

Thermodynamic properties of Al2O3 nanolubricants: Part 1-Effects on the two-phase pressure drop

机译：Al2O3纳米润滑剂的热力学性质：第1部分对两相压降的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In vapor compression cycles, a small portion of the oil circulates with the refrigerant throughout the system components and penalizes the heat transfer as well as increases the pressure losses. Nanolubricantslubricants with dispersed nanoparticlesare expected to provide enhancements in heat transfer. While solubility and miscibility of refrigerants in polyolester lubricant are well-established knowledge, there is a lack of information regarding if and how nanoparticles dispersed in the lubricant affect these two properties. This article presents the experimental data of solubility and miscibility of three types of Al2O3 nanolubricants with refrigerant R410A. The nanoparticles were dispersed in polyolester lubricant by using three different surfactants. The data identified optimum combinations to achieve stable and uniform dispersions. The associated viscosity was also measured. The viscosity was about 2.6 higher at 5 degrees C. The nanolubricants had also lower refrigerant R410A solubility with respect to polyolester oil, and surfactants slightly affected the viscosity and solubility properties of the nanolubricants. Finally, this article presents data of pressure drop for two-phase flow boiling in a horizontal tube with internally enhanced heat transfer surfaces and discusses the effect of the nanoparticles on the pressure drop of the mixture. Nanolubricant did not increase the two-phase pressure drop with respect to polyolester lubricant, and at low and medium mass flux, the pressure drop of nanolubricant were lower than the corresponding two-phase pressure drop of refrigerant R410A and polyolester oil mixture. Two correlations from the literature predicted well the pressure drop data of the refrigerant R410A and polyolester oil mixture of the present work, while their accuracy for the nanolubricant mixture was slightly over +/- 20%.
机译：在蒸气压缩循环中，一小部分机油与制冷剂一起在整个系统组件中循环，并不利于传热并增加压力损失。纳米润滑剂预期具有分散的纳米颗粒的润滑剂将增强传热。尽管制冷剂在多元醇酯润滑剂中的溶解度和可混溶性是众所周知的知识，但缺乏有关是否以及如何分散在润滑剂中的纳米颗粒影响这两种性能的信息。本文介绍了三种类型的Al2O3纳米润滑剂与制冷剂R410A的溶解度和互溶性的实验数据。通过使用三种不同的表面活性剂将纳米颗粒分散在多元醇酯润滑剂中。数据确定了实现稳定和均匀分散的最佳组合。还测量了相关的粘度。在5℃下粘度约高2.6。纳米润滑剂相对于多元醇酯油还具有较低的制冷剂R410A溶解度，并且表面活性剂对纳米润滑剂的粘度和溶解度性能有轻微影响。最后，本文介绍了具有内部增强传热表面的水平管中两相流沸腾的压降数据，并讨论了纳米颗粒对混合物压降的影响。相对于多元醇酯润滑剂，纳米润滑剂没有增加两相压降，并且在低和中等质量通量下，纳米润滑剂的压降低于制冷剂R410A和多元醇酯油混合物的相应的两相压降。来自文献的两个相关性很好地预测了本工作的制冷剂R410A和多元醇酯油混合物的压降数据，而它们对纳米润滑剂混合物的精度略高于+/- 20％。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号