...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Heat Transfer >Thermal and Hydraulic Performance of Counterflow MicroChannel Heat Exchangers With and Without Nanofluids
【24h】

Thermal and Hydraulic Performance of Counterflow MicroChannel Heat Exchangers With and Without Nanofluids

机译：有和没有纳米流体的逆流微通道换热器的热力和水力性能

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

This paper analyzes the thermal and hydraulic performance of a counterflow microchan-nel heat exchanger (CFMCHE) with and without nanofluid as working fluid. A 3D conjugate heat transfer simulation is carried out using a finite volume approach to evaluate the effects of inlet Reynolds number, Brownian motion, and volume fraction of nanopar-ticles on the pumping power, effectiveness, and performance index of CFMCHE. The accuracy of the code has been verified by comparing the results with those available in the literature. A single phase approach is used for the nanofluid modeling. The base fluid used in the analyses as a basis for comparison was pure water. Two types of nanofluids, namely, water-Al_2O_3 with a mean diameter of 47 nm and water-CuO with a mean diameter of 29 nm, each one with three different volume fractions, are utilized. In addition, two temperature dependent models for the thermal conductivity and viscosity of nanofluids that account for the fundamental role of Brownian motion are used. Calculated results demonstrate that the effectiveness and performance index of CFMCHE decrease with increasing Reynolds number. Moreover, it is observed that the relative enhancements in the pumping power become more prominent for higher values of Reynolds numbers. It was also found that the performance index and pumping power are not sensitive to volume fraction at higher and lower Reynolds numbers, respectively.
机译：本文分析了使用和不使用纳米流体作为工作流体的逆流微通道换热器（CFMCHE）的热力和水力性能。使用有限体积方法进行了3D共轭传热模拟，以评估入口雷诺数，布朗运动和纳米颗粒的体积分数对CFMCHE的泵送功率，有效性和性能指标的影响。通过将结果与文献中提供的结果进行比较，可以验证代码的准确性。单相方法用于纳米流体建模。分析中用作比较基础的基础流体是纯水。使用两种类型的纳米流体，即平均直径为47 nm的水Al_2O_3和平均直径为29 nm的水CuO，每种纳米流体具有三种不同的体积分数。另外，使用了两个依赖于温度的纳米流体的导热率和粘度模型，这些模型解释了布朗运动的基本作用。计算结果表明，随着雷诺数的增加，CFMCHE的有效性和性能指标降低。此外，可以观察到，对于更高的雷诺数值，泵浦能力的相对增强变得更加突出。还发现，性能指数和泵浦功率分别对较高和较低雷诺数下的体积分数不敏感。

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