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首页> 外文期刊>Journal of enhanced heat transfer >HEAT TRANSFER ENHANCEMENT CAUSED BY IMPINGING JETS OF Al_2O_3-WATER NANOFLUID ON A MICRO-PIN FIN ROUGHENED SURFACE UNDER CROSSFLOW CONDITIONS-A NUMERICAL STUDY
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HEAT TRANSFER ENHANCEMENT CAUSED BY IMPINGING JETS OF Al_2O_3-WATER NANOFLUID ON A MICRO-PIN FIN ROUGHENED SURFACE UNDER CROSSFLOW CONDITIONS-A NUMERICAL STUDY

机译：在横流条件下，通过在横流条件下将Al_2O_3水纳米流体的喷射引起的热传递增强 - 一个数值研究

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Advanced electronic devices need ultrahigh performance cooling techniques. One such technique is jet impingement cooling. This study numerically investigates the thermal performance and flow behavior of an array of alumina oxide-water nanofluid impinging jet systems under crossflow. The Reynolds number of the jet array ranges between 4000 and 20,000 with a normalized distance between the jet's outlet and target plate (Z/D) equal to 3. The target wall is roughened with micro-pin fins for surface enlargement. All of the computations are done in ANSYS-FLUENT using the shear stress transport k-omega turbulence model. The paper reports numerical predictions matching satisfactorily well with the empirical data. However, more research in the context of turbulence models solely for turbulent nanofluid modeling is recommended for future studies. The influence of volumetric concentrations phi = 0%, 0.2%, 0.7%, 1.5%, and 3% of Al2O3 nanoparticles is explored. It is inferred from the simulations that the addition of the nanoparticles does not influence the velocity field with the simplified method used in the current work. It can also be inferred that the increasing values of the nanoparticle concentration would cause a rise in the nanofluid equivalent thermal conductivity leading to a reduction in the Nusselt number, whereas the average convective heat transfer coefficient would improve. About 72% improvement in the heat transfer coefficient (h) of the nanofluid is observed while the Nusselt number is reduced by about 30% at volumetric concentration phi = 3%. The addition of pin fins would help in further heat transfer improvement.
机译：先进的电子设备需要超高性能冷却技术。一种这样的技术是喷射冲击冷却。该研究数值研究了氧化铝 - 水纳米流体撞击射流系统阵列的热性能和流动性能。射流阵列的雷诺数在4000和20,000之间，喷射出口和目标板（z / d）之间的归一化距离等于3.靶壁与微引脚翅片粗糙化，用于表面放大。所有计算都是在ANSYS-FLUENT中完成的，使用剪切应力传输K-Omega湍流模型。本文向经验数据报告了数值预测符合良好的匹配。然而，建议在未来的研究中对湍流模型的背景下进行湍流模型的更多研究。体积浓度Phi = 0％，0.2％，0.7％，1.5％和3％的影响是探讨Al2O3纳米颗粒的影响。从模拟推断，添加纳米颗粒的添加不会影响当前工作中使用的简化方法的速度场。还可以推断出纳米颗粒浓度的增加值会导致纳米流体等效导热率的上升导致营养数的减少，而平均对流传热系数将改善。观察到纳米流体的传热系数（H）的提高约72％，而营养数在体积浓度下减少约30％= 3％。销翅片的添加将有助于进一步的传热改进。

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