The Cross-Flow Mixing Analysis of Quasi-Static Pebble Flow in Pebble Bed Reactor

2018 ◽  
Author(s):  
Fang Xiang ◽  
Yang Xingtuan ◽  
Jiang Shengyao
Keyword(s):  
Cross Flow ◽  
Particle Flow ◽  
Research Subjects ◽  
Pebble Bed ◽  
Pebble Bed Reactor ◽  
Slow Particle ◽  
Flow Mixing ◽  
The Cross ◽  
Pebble Flow ◽  
Flow Cross

In the pebble bed reactor, large number of fuel pebbles’ movement law and moving state can affect the reactor’s design, operation and safety directly. Therefore the pebble flow, which is based on the theory of particle streaming, is one of the most important research subjects of the pebble bed reactor engineering. The in-core pebble flow is a very slow particle flow (or called quasi-static particle flow), which is very different from the usual particle motion. How to accurately describe the characteristics of in-core pebble flow is a central issue for this subject. Due to the presence of random flow, the cross-mixing phenomenon will occur inevitably. In the present paper, the mixing phenomenon of pebble flow is generalized on the basis of experiment results. The pebble flow cross-mixing probability serves as the parameter which describes both the regularity and the randomness of pebble flow. The results are provided in the form of diagrammatic presentation.

Effect of bed configuration on pebble flow uniformity and stagnation in the pebble bed reactor

2014 ◽  
Vol 270 ◽  
pp. 295-301 ◽  
Author(s):  
Nan Gui ◽  
Xingtuan Yang ◽  
Jiyuan Tu ◽  
Shengyao Jiang
Keyword(s):  
Flow Uniformity ◽  
Pebble Bed ◽  
Pebble Bed Reactor ◽  
Pebble Flow

Effect of friction on pebble flow pattern in pebble bed reactor

2016 ◽  
Vol 94 ◽  
pp. 32-43 ◽  
Author(s):  
Yu Li ◽  
Nan Gui ◽  
Xingtuan Yang ◽  
Jiyuan Tu ◽  
Shengyao Jiang
Keyword(s):  
Flow Pattern ◽  
Pebble Bed ◽  
Pebble Bed Reactor ◽  
Pebble Flow

A study on evaluation of pebble flow velocity with modification of the kinematic model for pebble bed reactor

2013 ◽  
Vol 55 ◽  
pp. 322-330 ◽  
Author(s):  
Song Hyun Kim ◽  
Hong-Chul Kim ◽  
Jong Kyung Kim ◽  
Jea Man Noh
Keyword(s):  
Flow Velocity ◽  
Kinematic Model ◽  
Pebble Bed ◽  
Pebble Bed Reactor ◽  
Pebble Flow

Experimental and Numerical Study of the Movement Mechanism and Characteristics of the Quasi-Static Pebble Flow

2013 ◽  
Author(s):  
Xinlong Jia ◽  
Nan Gui ◽  
Xingtuan Yang ◽  
Jiyuan Tu ◽  
Shengyao Jiang
Keyword(s):  
Numerical Study ◽  
Mixing Zone ◽  
Force Analysis ◽  
Particle Movement ◽  
Pebble Bed ◽  
Dem Simulation ◽  
Pebble Bed Reactor ◽  
Pebble Bed Reactors ◽  
Movement Mechanism ◽  
Pebble Flow

Quasi-static pebble flow, or so-called the very slow pebble flow, in a pebble bed reactor, with evident randomicity and dispersibility, is extremely complex. Improving the knowledge of the movement mechanism of quasi-static pebble flow can be beneficial to the safety of the pebble bed reactor. This study utilizes a phenomenological method and a discrete element method to investigate the interface features of two regions composed of differently colored pebbles. A pseudo-two dimensional experimental setup is established to facilitate the observation of movement of pebble. Then, the DEM simulation is carried out to analyze the further details of particle movement mechanism. To some extent, the two methods are closely related and mutually confirmed. In this study, some special phenomena are observed, such as the non-uniformity, mixing zone, stagnant zones, the propagation of voids, slow flow zone, etc. Moreover, some basic issues on the movement mechanism and characteristics of quasi-static pebble flow are discussed, e.g. the interpretation of force analysis inside the pebble packing, propagation and distribution of voids, formation of equilibrium arches, the effects of stagnant zone on the flow field, and so on. These characteristics of the quasi-static pebble flow are very different from the continuous flow, and the understanding of these characteristics is very helpful for the design and analysis of pebble bed reactors.

scholarly journals Investigation of the Effect of Pipeline Size on the Cross Flow Injection Process

2016 ◽  
Vol 6 (3) ◽  
pp. 1023-1028 ◽  
Author(s):  
M. Elashmawy ◽  
A. Alghamdi ◽  
I. Badawi
Keyword(s):  
Flow Injection ◽  
Flow Behavior ◽  
Cross Flow ◽  
Industrial Applications ◽  
Injection Process ◽  
Injection Pump ◽  
Flow Mixing ◽  
Injection Dose ◽  
The Cross ◽  
Line Pressure

Injection pumps constitute an essential component for many industrial applications. The main focus of this study is to predict the effect of the size of the pipeline on the cross flow injection process. A test-rig was designed, built and equipped with three different pipelines, 1½", ¾" and ½" diameters. Comparison was made under constant line pressure of 40-bar and line flow rate of 5 liter/min, with a fixed injection pump rotational speed of 100 rpm. The main parameter tested was the injection dose capacity at different pump displacements. Cross flow mixing process is also theoretically studied using 3D-CFD analysis to show the injection cross flow behavior for the same geometry and parameters used for experimental test. Results show that increasing the size of the pipeline increases injection pump doses ability. This effect is insignificant at lower injection pump displacements, while the effect of the size of the pipeline becomes dominant when increasing the displacement. By changing the size of the pipeline from ½" to 1½" diameter injection pump dose capacity increases by 3.24% at 100% pump displacement. Selecting larger pipe sizes for injection ports is recommended whenever possible.

Preliminary neutronic study on Pu-based OTTO cycle pebble bed reactor

Kerntechnik ◽  
2017 ◽  
Vol 82 (6) ◽  
pp. 643-647 ◽  
Author(s):  
T. Setiadipura ◽  
D. Irwanto ◽  
Zuhair
Keyword(s):  
Otto Cycle ◽  
Pebble Bed ◽  
Pebble Bed Reactor
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