重力驱动颗粒流横掠倒置滴形管管外流动传热特性的数值研究

谈周妥; 郭志罡; 杨剑; 王秋旺

doi:10.11949/0438-1157.20190557

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重力驱动颗粒流横掠倒置滴形管管外流动传热特性的数值研究

流体力学与传递现象 | 更新时间：2020-06-24

- 重力驱动颗粒流横掠倒置滴形管管外流动传热特性的数值研究
- Numerical investigation on flow and heat transfer performance of gravity-driven granular flowing across inverted drop-shaped tube
- 化工学报 2019年70卷第S2期页码：94-100
- 作者机构：
  
  西安交通大学热流科学与工程教育部重点实验室，陕西西安 710049
- 作者简介：
  
  谈周妥（1995—），男，博士研究生，15529569297@126.com
  王秋旺（1969—），男，博士，教授，wangqw@mail.xjtu.edu.cn
- 基金信息：
  
  国家自然科学基金项目(2017YFB0603500)
- DOI：10.11949/0438-1157.20190557
  中图分类号： TQ 025.2
- 收稿：2019-05-23，
  
  修回：2019-05-30，
  
  纸质出版：2019-09-05
- 稿件说明：
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谈周妥, 郭志罡, 杨剑, 王秋旺. 重力驱动颗粒流横掠倒置滴形管管外流动传热特性的数值研究[J]. 化工学报, 2019, 70(S2): 94-100

TAN Zhoutuo, GUO Zhigang, YANG Jian, WANG Qiuwang. Numerical investigation on flow and heat transfer performance of gravity-driven granular flowing across inverted drop-shaped tube[J]. CIESC Journal, 2019, 70(S2): 94-100
谈周妥, 郭志罡, 杨剑, 王秋旺. 重力驱动颗粒流横掠倒置滴形管管外流动传热特性的数值研究[J]. 化工学报, 2019, 70(S2): 94-100 DOI： 10.11949/0438-1157.20190557.

TAN Zhoutuo, GUO Zhigang, YANG Jian, WANG Qiuwang. Numerical investigation on flow and heat transfer performance of gravity-driven granular flowing across inverted drop-shaped tube[J]. CIESC Journal, 2019, 70(S2): 94-100 DOI： 10.11949/0438-1157.20190557.

摘要

采用离散单元方法（DEM）模拟了重力驱动的颗粒流横掠圆管和不同椭圆度（

=1.0

1.5

2.0

2.5）的滴形管下的流动与换热情况，分析了滴形管的椭圆度对停滞区大小、管周受力以及有效传热系数的影响，并与圆管进行了对比。主要结论如下：滴形管的停滞区和空区均小于圆管，随着椭圆度增大，管顶部颗粒流速增加，流动性变好；滴形管受颗粒流的法向力和切向力均小于圆管，在椭圆度大于1.0后，增加椭圆度，两力不再减小；滴形管的有效传热系数小于圆管，且随着椭圆度增大，有效传热系数降低。

Abstract

Gravity-driven granular flowing across inverted drop-shaped tubes is investigated

with the aim to enhance flow and heat transfer performance and avoid particle stagnant. The discrete element method was used to simulate the flow and heat transfer of a gravity-driven particle flow across a circular tube and a drop-shaped tube with different ellipticities (

= 1.0

1.5

2.0

2.5) was analyzed.t The effect of ellipticity on the size of the stagnation zone

the normal and tangential force on the pipe

and the effective heat transfer coefficient was compared with the circular tube. The main conclusions are as follows: compared with circular tube

granular flow drop-shaped tubes perform better in flow and stagnation avoidance. The stagnation area and the void area of the drop-shaped tube are smaller than the circular tube. As the ellipticity increases

the particle flow velocity at the top of the tube increases

and the flow upward the tube becomes better. The drop-shaped tube is subjected to the normal force and the tangential force of the granular flow and both are smaller than the circular tube. After the ellipticity is more than 1.0

the ellipticity is increased

and the two forces are no longer reduced. The effective heat transfer coefficient of the drop-shaped tube is smaller than that of the circular tube

and the effective heat transfer coefficient decreases as the ellipticity increases.

关键词

Keywords

references

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