Resistance characteristics of bed packed with mono-size cylindrical particles

Chengquan ZHANG; Jun GAO; Lipeng LYU; Lianjie HE

doi:10.11949/0438-1157.20190457

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Resistance characteristics of bed packed with mono-size cylindrical particles

Fluid dynamics and transport phenomena | 更新时间：2020-06-24

- Resistance characteristics of bed packed with mono-size cylindrical particles
- CIESC Journal Vol. 70, Issue 11, Pages: 4181-4190(2019)
- 作者机构：
  
  同济大学机械与能源工程学院，上海 200082
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20190457
  CLC： X 511
- Received：05 May 2019，
  
  Revised：2019-06-18，
  
  Published：05 November 2019
- 稿件说明：
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张承全, 高军, 吕立鹏, 贺廉洁. 单一尺寸圆柱颗粒填充床的阻力特性[J]. 化工学报, 2019, 70(11): 4181-4190

ZHANG Chengquan, GAO Jun, LYU Lipeng, HE Lianjie. Resistance characteristics of bed packed with mono-size cylindrical particles[J]. CIESC Journal, 2019, 70(11): 4181-4190
张承全, 高军, 吕立鹏, 贺廉洁. 单一尺寸圆柱颗粒填充床的阻力特性[J]. 化工学报, 2019, 70(11): 4181-4190 DOI： 10.11949/0438-1157.20190457.

ZHANG Chengquan, GAO Jun, LYU Lipeng, HE Lianjie. Resistance characteristics of bed packed with mono-size cylindrical particles[J]. CIESC Journal, 2019, 70(11): 4181-4190 DOI： 10.11949/0438-1157.20190457.

摘要

通过直径为3、4 mm不同长度的圆柱颗粒填充床的阻力特性实验，研究了颗粒密度对填充床孔隙率的影响，结合文献孔隙率数据修正了孔隙率模型使其在高球形度时预测更准，分析了等效直径的计算方法对Ergun常数的影响，得到圆柱颗粒填充床的阻力特性并与Nemec和Wu的阻力预测模型进行对比，提出新的拟合方法对Ergun常数进行拟合。结果表明：颗粒密度在1156~7947 kg/m³范围内对填充床的孔隙率没有影响；结合文献数据得到圆柱颗粒填充床的孔隙率修正模型；文献中预测不同

L/D

的圆柱颗粒堆积床的阻力时结果相差较大，Nemec模型要比Wu模型预测准确度高，但也不适用所有

L/D

下的阻力预测；结合圆柱颗粒填充床孔隙率提出新的拟合方法，拟合Ergun常数时，采用

作为等效直径的拟合优度最高；提出新的Ergun常数表达式，适用于圆柱直径3~4 mm，

L/D

=1~10的圆柱颗粒，相比于Nemec模型其

更高，适用范围更明确，因此实用性更强。

Abstract

The effect of particle density on the porosity of packed bed was studied by the experiment of the resistance characteristics of packed bed with cylindrical particles of different lengths of 3 mm and 4 mm. According to the experimental results

the following conclusions can be drawn that the porosity of the packed bed of cylindrical particles is independent of the particle density and is only related to the aspect ratio of the cylindrical particles.The modified model of the porosity of cylindrical particles packed bed was developed to make the prediction more accurate at high sphericity. The existing research results still have contradictions in predicting the cylindrical particle packed bed under different

values. And the Nemec model has higher prediction accuracy than the Wu model. When

is used as the equivalent diameter

the

of Ergun constants are 0.92(

) and 0.98(

)

respectively

which is highest compared with that of other equivalent diameters.

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Keywords

references

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