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首页> 外文期刊>Journal of enhanced heat transfer >ENHANCED HEAT TRANSFER FROM HOT SURFACE BY NANOFLUID BASED ULTRAFAST COOLING: AN EXPERIMENTAL INVESTIGATION
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ENHANCED HEAT TRANSFER FROM HOT SURFACE BY NANOFLUID BASED ULTRAFAST COOLING: AN EXPERIMENTAL INVESTIGATION

机译：基于纳米流体的超快冷却增强的热从表面传热的实验研究

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摘要

Nanofluids have promising characteristics of accomplishing high rate of heat removal from hot surfaces. An ultrafast cooling facility was developed at the School of Mechanical Engineering, KIIT University, Bhubaneswar, to investigate the effects of nanofluids impinging onto a heated steel surface of dimension 120 mm x 120 mm and having 4 mm thickness. K-type thermocouples were used for transient temperature measurement. Heat transfer experiments were conducted by using waterbased TiO2 nanofluids with four different particle concentrations (0.01 wt%, 0.03 wt%, 0.05 wt%, and 0.07 wt %) separately and compared with the performance of pure water. The addition of nanosized particles to the base fluid (water) could enhance the cooling process. The influence of nozzle tip to plate distance, mass concentrations, and fluid pressure upon the heat transfer rate was investigated. Detailed heat transfer characteristics in terms of time-dependent temperature distribution and surface cooling rate of the impingement flows with various combinations of mass concentration of nanoparticle were measured using a transient technique. The ultrafast cooling method based on nanofluids spray was found to be an efficient alternative cooling technique over the conventional water impingement cooling to achieve the optimal and high cooling rate. The overall improvement in cooling rate found to be 19.34%, 11.3%, and 7.14% using TiO2, Al2O3, and CuO nanofluids over the conventional liquid (water).
机译：纳米流体具有从热表面实现高速率除热的有前途的特性。布巴内斯瓦尔KIIT大学机械工程学院开发了一种超快冷却设备，以研究纳米流体撞击到尺寸为120 mm x 120 mm且厚度为4 mm的加热钢表面上的影响。 K型热电偶用于瞬态温度测量。通过分别使用具有四个不同颗粒浓度（0.01 wt％，0.03 wt％，0.05 wt％和0.07 wt％）的水基TiO2纳米流体进行传热实验，并将其与纯水的性能进行比较。向基础流体（水）中添加纳米级颗粒可以增强冷却过程。研究了喷嘴尖端对板距，质量浓度和流体压力对传热速率的影响。使用瞬态技术测量了纳米粒子质量浓度的各种组合下冲击流随时间的温度分布和表面冷却速率的详细传热特性。已发现基于纳米流体喷雾的超快冷却方法是一种有效的替代冷却技术，可替代常规的水冲击冷却以实现最佳且高的冷却速率。与传统的液体（水）相比，使用TiO2，Al2O3和CuO纳米流体时，冷却速度的总体提高为19.34％，11.3％和7.14％。

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