• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Clean air >EXPERIMENTAL INVESTIGATION OF THE EFFECT OF HEAT TRANSFER AND PRESSURE DROP ON PERFORMANCE OF A FLAT TUBE BY USING WATER-BASED A1_2O_3 NANOFLUIDS
【24h】

EXPERIMENTAL INVESTIGATION OF THE EFFECT OF HEAT TRANSFER AND PRESSURE DROP ON PERFORMANCE OF A FLAT TUBE BY USING WATER-BASED A1_2O_3 NANOFLUIDS

机译：使用水基A1_2O_3纳米流体进行热传递和压力降压对扁平管性能的实验研究

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

The aim of the present study was to experimentally investigate the heat transfer and pressure drop characteristics in a vertical flat tube with nanofluids. Aluminum oxide nanoparticles with average size of 20 nm were used to prepare the nanofluids of different volume fractions (0.1%, 0.2%, 0.3%, and 0.4%) without the use of any surfactant. The thermophysical properties, i.e., thermal conductivity, viscosity, and density over a wide range of temperatures (30°C–65°C) were measured experimentally. The thermal conductivity, viscosity, and density increased with the concentration of nanofluids. The heat transfer coefficient and pressure drop were estimated for different inlet temperatures of nanofluids (45°C–85°C) for the Reynolds number range 10,000–30,000, while the air velocity was kept constant at 0.55 m/s. During the experimentation, it was observed that the heat transfer coefficient and pressure drop increased with the Reynolds number and particle volume fraction. It was also observed that the heat transfer coefficient increased with the fluid inlet temperature because the viscosity and density of the fluid decreased at higher temperatures, while the pressure drop decreases slightly with increase in the fluid inlet temperatures. The heat transfer coefficient increased when the particle volume fraction was increased from 0.1% to 0.4% and maximum heat transfer coefficient was enhanced by 14% with the use of 0.4% v/v concentration of nanofluids at Reynolds number 30,000 and inlet temperature 85°C. The pressure drop ratio was 1.4 for 0.4% v/v concentrations of Al _( 2 ) O _( 3 ) nanoparticles.
机译：本研究的目的是通过纳米流体实验地研究垂直平管中的传热和压降特性。使用平均尺寸为20nm的氧化铝纳米颗粒用于制备不同体积级分的纳米流体（0.1％，0.2％，0.3％和0.4％），而不使用任何表面活性剂。实验测量热物理性质，即导热率，粘度和宽范围（30℃-65℃）的密度。随着纳米流体的浓度，导热率，粘度和密度增加。雷诺流量范围10,000-30,000的纳米流体（45℃-85℃）的不同入口温度估计传热系数和压降估计，而空气速度保持恒定在0.55m / s。在实验期间，观察到传热系数和压降随着雷诺数和颗粒体积分数而增加。还观察到，传热系数随流体入口温度而增加，因为流体的粘度和密度在较高温度下降低，而压力下降随着流体入口温度的增加而略微降低。当颗粒体积分数从0.1％增加到0.4％升高时，传热系数增加，并且在雷诺数30,000和入口温度85℃下使用0.4％v / v浓度纳米流体，最大传热系数提高了14％。 。压降比为0.4％v / v浓度的Al _（2）O _（3）纳米颗粒。

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