摘要: |
乙醇浆体因其在标准大气压下温度与常温(25 ℃)温差较大、显热蓄冷量大等特征,可作为冷链运输市场的蓄冷介质。在应用中乙醇浆体的流动特性(尤其压降)是很重要的特征参数。本文结合Gidaspow提出的以颗粒相动力学为基础的双流体模型,利用FLUENT研究了水平直管内乙醇浆体流动压降随含固率和流速的变化规律。当流速从0.51 m/s增至0.92 m/s时,含固率从10.4%升至30.5%时,压降从5.184 kPa/m增至63.707 kPa/m,模型与实验测量变化规律一致,实验结果与数值模拟结果平均偏差为12.8%。 |
关键词: 蓄冷介质 乙醇 压降特性 固液两相 |
DOI: |
投稿时间:2022-08-31 修订日期:2022-11-15
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基金项目: |
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Numerical Simulation and Experimental Study of Pressure Drop of Ethanol Slurry Flow in Horizontal Straight Pipe |
Fan Xiaoya1, Zhou Liyang2, Chen Qi3, Wang Shuhua2, Wang Binhui2, Gao Ruqi3, Chen Guangming3, Tang Liming3, Jin Tao3
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(1.Polytechnic Institute, Zhejiang University;2.JUHUA Group Corporation;3.College of Energy Engineering, Zhejiang University) |
Abstract: |
Due to the large temperature difference between ambient temperature (25 ℃) and the temperature under standard atmospheric pressure and its large sensible heat storage capacity, ethanol slurry can be used as a cold thermal energy storage medium in the cold-chain transportation market. The flow characteristics (particularly the pressure drop) of the ethanol slurry are important parameters in various applications. Combined with the two-fluid model based on particle phase dynamics proposed by Gidaspow, changes in the flow rate and pressure drop of an ethanol slurry flow with solid phase fraction in a horizontal straight pipe were studied using FLUENT. When the flow rate increased from 0.51 m/s to 0.92 m/s, the pressure drop increased from 5.184 kPa/m to 63.707 kPa/m and the solid phase fraction changed from 10.4% to 30.5%. The model was consistent with the experimental observations; the average deviation between the experimental results and the numerical simulation was 12.8%. |
Key words: cold thermal energy storage medium ethanol pressure drop characteristics solid-liquid two-phase system |