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首页> 外文期刊>International Journal of Heat and Mass Transfer >Transient forced convection heat transfer for nitrogen gas flowing over plate heater with exponentially increasing heat input
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Transient forced convection heat transfer for nitrogen gas flowing over plate heater with exponentially increasing heat input

机译：氮气流过平板加热器的瞬态强制对流换热，其热输入呈指数增长

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摘要

The transient forced convection heat transfer of plate heater for nitrogen gas due to exponentially increasing heat input was investigated experimentally and numerically. The platinum ribbon with a thickness of 0.1 mm and a width of 4.0 mm was used as the test heater. The heat generation rate of the test heater was raised with exponential function. The inlet flow velocity was ranged from 2 to 4 m/s for the gas temperature of 313 K under the system pressure of 500 kPa. The period of heat generation rate was ranged from 45 ms to 8 s. Experimental results indicate that the surface temperature difference and heat flux increased exponentially as the heat generation rate increased through an exponential function. It was clarified that the heat transfer coefficient was divided into the two regions for the period ranging from 45 ms to 8 s. The numerical results were compared with experimental data. The numerical simulation was in agreement with the experimental data.
机译：实验和数值研究了由于热量输入呈指数增加而导致的板式氮气加热器强制对流换热。厚度为0.1毫米，宽度为4.0毫米的铂带用作测试加热器。通过指数函数提高了测试加热器的发热量。在500 kPa的系统压力下，对于313 K的气体温度，入口流速的范围为2-4 m / s。发热速率的周期为45ms至8s。实验结果表明，表面温度差和热通量随着热量通过指数函数的增加而呈指数增长。明确了，传热系数被分为两个区域，持续时间为45 ms至8 s。数值结果与实验数据进行了比较。数值模拟与实验数据吻合。

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