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首页> 外文期刊>International Journal of Heat and Mass Transfer >A micro impinging jet with supercritical carbon dioxide
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A micro impinging jet with supercritical carbon dioxide

机译：具有超临界二氧化碳的微撞击喷射

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摘要

A micro device with a 206 um nozzle diameter and a standoff of 7.3 was fabricated and used to study the characteristics of micro jet impinging heat transfer with supercritical CO_2. The issuing jet impinged on a 500 um thick fused silica substrate measuring 30.5 × 1.9 mm~2, onto which a heater, three temperature sensors (RTDs), and their respective leads were sputtered. The RTDs were arranged in a concentric manner with r/d values of 0.21, 1.44, and 2.89. Four holes were drilled into the device to allow passage of spent fluid, which were collected in a single channel out of the medium. The effects of heat flux, radial positions, mass flux and inlet temperature were studied for a pressure of 7.45 MPa - higher than the supercritical pressure of CO_2. The highest local heat transfer coefficient of -40,000 W/m~2K was recorded at the RTD closest to the stagnation region at a heat flux of 54.5 W/cm2 and an inlet Reynolds number of approximately 15,500, corresponding to conditions near the pseudocritical temperature. Deviations between experiments and available correlations were noted especially at higher Reynolds number. A Nusselt number correlation for micro jet impingement with SCO_2 was proposed.
机译：制造具有206μm喷嘴直径的微型装置和7.3的支座，并用于研究撞击传热与超临界CO_2的微喷射的特性。发出喷射溅射在500微米厚的熔融二氧化硅基板上，测量为30.5×1.9mm〜2，加热器，三个温度传感器（RTD）及其各自的引线溅射在其上。 RTD以同心的方式排列，R / D值为0.21,1.44和2.89。将四个孔钻入装置中以允许废液通过，该流体在单个通道中收集在介质中。研究了热通量，径向位置，质量磁通和入口温度的影响，压力为7.45MPa - 高于CO_2的超临界压力。在最接近停滞区域的最高-40,000W / m〜2k的最高局部传热系数，在最接近54.5W / cm 2的热通量和大约15,500的入口雷诺数，对应于伪科学温度附近的条件。实验与可用相关之间的偏差特别是在较高的雷诺数。提出了一种用SCO_2进行微喷射冲击的良好数量相关性。

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