Investigation on the Flow Resistance in Stratified Particulate Packed Beds

doi:10.7652/xjtuxb201907009

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Investigation on the Flow Resistance in Stratified Particulate Packed Beds

更新时间：2025-07-09

- Investigation on the Flow Resistance in Stratified Particulate Packed Beds
- Vol. 53, Issue 7, Pages: 60-66+117(2019)
- 作者机构：
  
  西安交通大学动力工程多相流国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201907009
  CLC： TK124
- Online First：10 July 2019，
  
  Published：2019
- 稿件说明：
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Investigation on the Flow Resistance in Stratified Particulate Packed Beds[J]. 2019, 53(7): 60-66+117.
DOI：

Investigation on the Flow Resistance in Stratified Particulate Packed Beds[J]. 2019, 53(7): 60-66+117. DOI： 10.7652/xjtuxb201907009.

摘要

为了研究反应堆严重事故后分层结构碎片床的流动阻力特性

使用4种尺寸球形颗粒构建了3种颗粒堆积床

分别是颗粒均匀堆积床、水平分层颗粒堆积床和竖直分层颗粒堆积床。基于3种颗粒堆积床

开展了单相/两相流动实验

对比分析了不同堆积结构颗粒床内的流动阻力特性。研究结果表明:对水平分层结构

当下层为小颗粒、上层为大颗粒时

分层结构对流动阻力压降的影响可以忽略

堆积床上下层内的流动阻力压降和相同尺寸的颗粒均匀堆积床内的流动阻力压降基本相同; 当下层为大颗粒、上层为小颗粒时

分层结构显著提高了上层小颗粒堆积床内的流动阻力压降

在最大实验流速工况下

上层小颗粒堆积床的流动阻力压降约是相同尺寸颗粒均匀堆积床的1.25倍

而下层大颗粒床内的阻力压降基本不变。竖直分层颗粒堆积床内存在横向流动

导致小颗粒堆积层内流动阻力压降降低而大颗粒层的流动阻力压降升高。研究结果对完善多孔介质结构内的流动阻力分析具有重要意义。

Abstract

To study the characteristics of flow resistances in a stratified debris packed bed after severe accident in nuclear reactor

the paper reports an experimental study on the pressure drops of single-/two-phase flow through the vertically and hori-ontally stratified beds.Three types of particular beds were designed and constructed with different si-es of glass spheres.Type-1 bed is a homogeneous bed consisting of single si-e spheres.While Type-2 bed and Type-3 bed are stratified beds with the structure of hori-ontal stratification and vertical stratification

respectively.Both single- and two-phases flow tests were carried out

and the pressure drops were measured.The results showed that

for a hori-ontally stratified bed with larger particles atop and smaller particles down

the pressure drops in each part of hori-ontally stratified bed are almost the same as those of homogeneous bed packed with the same si-e spheres.It seems that the stratification has less effect on the pressure drops

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references

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