...
  • 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 Fluid Flow >Three-dimensional numerical study and field synergy principle analysis of wavy fin heat exchangers with elliptic tubes
【24h】

Three-dimensional numerical study and field synergy principle analysis of wavy fin heat exchangers with elliptic tubes

机译：椭圆管波纹翅片换热器的三维数值研究与场协同原理分析

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

Three dimensional numerical studies were performed for laminar heat transfer and fluid flow characteristics of wavy fin heat exchangers with elliptic/circular tubes by body-fitted coordinates system. The simulation results of circular tube were compared with the experiment data, then circular and elliptic (e = b/a = 0.6) arrangements with the same minimum flow cross-sectional area were compared. A max relative heat transfer gain of up to 30% is observed in the elliptic arrangement, and corresponding friction factor only increased by about 10%. The effects of five factors on wavy fin and elliptic tube heat exchangers were examined: Reynolds number (based on the smaller ellipse axis, 500 ～ 4000), eccentricity (b/a, 0.6 ～ 1.0), fin pitch (F_p/2b, 0.05 ～ 0.4), fin thickness (F_t/2b, 0.006 ～ 0.04) and tube span-wise pitch (S_l/2b, 1.0 ～ 2.0). The results show that with the increasing of Reynolds number and fin thickness, decreasing of the eccentricity and spanwise tube pitch, the heat transfer of the finned tube bank are enhanced with some penalty in pressure drop. There is an optimum fin pitch (F_p/2b = 0.1) for heat transfer, but friction factor always decreases with increase of fin pitch. And when F_p/2b is larger than 0.25, it has little effects on heat transfer and pressure drop. The results were also analyzed from the view point of field synergy principle. It was found that the effects of the five factors on the heat transfer performance can be well described by the field synergy principle.
机译：通过人体坐标系对椭圆/圆管波纹翅片换热器的层流传热和流体流动特性进行了三维数值研究。将圆形管的模拟结果与实验数据进行了比较，然后比较了具有相同最小流动截面积的圆形和椭圆形（e = b / a = 0.6）布置。在椭圆形布置中观察到最大相对传热增益高达30％，并且相应的摩擦系数仅增加了约10％。研究了五个因素对波状翅片和椭圆管换热器的影响：雷诺数（基于较小的椭圆轴，500〜4000），偏心率（b / a，0.6〜1.0），翅片节距（F_p / 2b，0.05） ≤0.4），翅片厚度（F_t / 2b，0.006〜0.04）和管跨度间距（S_l / 2b，1.0〜2.0）。结果表明，随着雷诺数和翅片厚度的增加，偏心率和翼展方向管间距的减小，翅片管束的传热得到了增强，但对压降造成了一些损失。对于传热，有一个最佳的翅片间距（F_p / 2b = 0.1），但是摩擦系数总是随着翅片间距的增加而减小。当F_p / 2b大于0.25时，对传热和压降的影响很小。还从场协同原理的角度分析了结果。已经发现，这五个因素对传热性能的影响可以通过场协同原理很好地描述。

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