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Bubble Behavior Studies for Natural & Forced Circulation Conditions

作　者: Samran Anwar
导　师: 高璞珍
学　校: 哈尔滨工程大学
专　业: Nuclear Science and Engineering
关键词: 自然循环强迫循环过冷沸腾气泡行为摄影测量方法
分类号: TL334
类　型: 硕士论文
年　份: 2010年
下　载: 16次
引　用: 0次
阅　读: 论文下载

内容摘要

本文研究了过冷沸腾条件下的气泡行为。实验中,工质为去离子水,通过环形通道,采用摄影法进行实验观察。进行了自然循环和强迫循环实验,比较两种循环流动下的气泡行为。对于单气泡的生长,结果表明,滑移气泡生长符合Mihic函数,属于热力阶段,成核点处的气泡成长属于惯性阶段。理论分析和实验分析表明气泡的上升速度正比于气泡直径的平方根。对阻力系数,分别为自然循环和强制循环拟合了各自的阻力系数公式。发现这两个公式都既可以用于自然循环,也可以用于强制循环。影响气泡形状的主要因素是黏度和表面张力,当黏度和表面张力低时,气泡变形大。对于多气泡的行为,主要研究了竖直方向的聚合。实验中,观察到气泡在绕过前面气泡之后发生分离,这一点与Fortes图有所不同。

全文目录

摘要  4-5
Abstract  5-9
Chapter 1 INTRODUCTION  9-22
  1.1 Background  9-10
  1.2 Overview of the Chosen Research Area  10-15
    1.2.1 Flow Characteristics & Heat Transfer  11-12
    1.2.2 Convective & Nucleate Boiling Heat Transfer  12-13
    1.2.3 Natural Circulation Flow Characteristics  13
    1.2.4 Critical Heat Flux for Natural Circulation Flow  13-14
    1.2.5 Subcooled Boiling Flow & Forced Circulation  14-15
  1.3 Bubble Behavior  15-20
    1.3.1 Bubble Growth  16-17
    1.3.2 Bubble Departure & PNV Generation  17-19
    1.3.3 Bubble Rise Characteristics  19-20
    1.3.4 Bubble Size  20
  1.4 Objectives & Significance of Research  20-21
  1.5 Thesis Outline  21-22
Chapter 2 EXPERIMENTAL SETUP & EXPERIMENTALMETHODOLOGY  22-33
  2.1 Experimental Setup  22-28
    2.1.1 Pressu rizer  23
    2.1.2 Preheater  23
    2.1.3 Test Section  23-24
    2.1.4 Condenser  24-25
    2.1.5 Pump  25
    2.1.6 Control Room Operating Setup  25-27
    2.1.7 Other Auxiliary Systems  27-28
      2.1.7.1 Secondary Side Cooling Water System  27-28
      2.1.7.2 Heating System  28
      2.1.7.3 Pressurization System  28
    2.1.8 Equipments for Experimental Parameters Measurement  28
  2.2 Experimental Program & Methodology  28-31
    2.2.1 Experimental Program  28-29
    2.2.2 Experimental Procedure  29-30
    2.2.3 Measurement of Experimental Parameters  30-31
    2.2.4 Image Processing  31
  2.3 Chapter Summary  31-33
Chapter 3 ANALYSIS OF SINGLE BUBBLE IN NATURAL ANDFORCED CIRCULATION FLOWS  33-56
  3.1 Bubble Growth  33-41
  3.2 Bubble Rise Velocity  41-49
  3.3 Bubble Shape  49-55
  3.4 Chapter Summary  55-56
Chapter 4 ANALYSES OF MULTIPLE BUBBLES IN NATURAL ANDFORCED CIRCULATION FLOWS  56-76
  4.1 Bubble Aggregation  56-61
  4.2 Pplymerization in Natural Circulation  61-68
    4.2.1 Velocity Change  61-63
    4.2.2 Velocity Difference of Upper & Lower Bubbles  63-65
    4.2.3 Bubble Spacing Change  65-66
    4.2.4 Bubble Diameter Change  66-68
  4.3 Polymerization in Forced Circulation  68-74
    4.3.1 Velocity Change  68-69
    4.3.2 Velocity Difference of Upper & Lower Bubbles  69-71
    4.3.3 Bubble Spacing Change  71-73
    4.3.4 Bubble Diameter Change  73-74
  4.4 Comparison of Natural and Forced Circulation Aggregation Phenomena  74-75
  4.5 Chapter Summary  75-76
Conclusion  76-78
References  78-82
Publication  82-83
Acknowledgment  83

Bubble Behavior Studies for Natural & Forced Circulation Conditions

内容摘要

全文目录

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