• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical study of the thermo-hydraulic characteristics in a circular tube with ball turbulators. Part 1: PIV experiments and a pressure drop
【24h】

Numerical study of the thermo-hydraulic characteristics in a circular tube with ball turbulators. Part 1: PIV experiments and a pressure drop

机译：带有球形湍流器的圆管中热工水力特性的数值研究。第1部分：PIV实验和压降

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In the paper, being the first part out of two (the second one is focused on processes of heat transfer), results of the computer simulations of the flow in a circular pipe with a ball inserts turbulising the flow are presented. An influence of the diameter of balls and their longitudinal distance on a pressure drop in the turbulent flow as a function of the Reynolds number (for Re= 10,000 ÷ 300,000) was analyzed. The investigations were carried out for different diameters of the balls (Db = 7,10,13,16 and 19 mm) and different distances between them [L = 20,24,28,32,36,40,48,60 and 85 mm) at a constant inner diameter of the tube (Dp = 26 mm). The results indicate that for the whole tested range of ball diameters and their longitudinal arrangements, there is an analytical dependency which allows for expressing a friction factor by the relationship: f=A·Re~B. The constants A and B were functions of two variables: a dimensionless diameter of the ball (X = Db/Dp) and a dimensionless longitudinal distance between balls (Y=L/Dp). These two constants are closely related. They can be calculated analytically for the entire range of X and Y using a formula of the fourth order surface polynomial (15 coefficients of that polynomial are presented in the paper). The paper presents also experimental investigations carried out using a PIV (Particle Image Velocime-try) apparatus. A comparative analysis of selected inserts and numerical calculations was the goal. The obtained results show a good correlation between the experiment and computer modelling.
机译：在本文中，作为二分之一的第一部分（第二部分着重于传热过程），给出了带有球形插入物使流动紊乱的圆形管中流动的计算机模拟结果。分析了球的直径及其纵向距离对湍流中压降的影响，这是雷诺数的函数（对于Re = 10,000÷300,000）。针对不同直径的球（Db = 7,10,13,16和19 mm）以及它们之间的不同距离进行了研究[L = 20,24,28,32,36,40,48,60和85内径不变（Dp = 26 mm）。结果表明，在整个测得的球直径及其纵向排列范围内，存在一种分析依赖性，可以通过以下关系表示摩擦系数：f = A·Re〜B。常数A和B是两个变量的函数：球的无量纲直径（X = Db / Dp）和球之间的无量纲纵向距离（Y = L / Dp）。这两个常数密切相关。可以使用四阶表面多项式的公式（针对该多项式的15个系数）对X和Y的整个范围进行解析计算。本文还介绍了使用PIV（粒子图像测速）设备进行的实验研究。目标是对选定刀片和数值计算进行比较分析。获得的结果表明实验与计算机建模之间具有良好的相关性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号