• 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 >Thermo-fluidic characteristics of ice slurry in horizontal circular pipes
【24h】

Thermo-fluidic characteristics of ice slurry in horizontal circular pipes

机译：水平圆管中冰浆的热流特性

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

Ice slurry is composed of ice particles and aqueous solution, and it can be utilized as cold storage medium and secondary refrigerant in a secondary-loop refrigeration. In the present study, the forced convective flow and heat transfer of ice slurry in horizontal pipes were numerically investigated, in which 3D Euler-Euler multiphase model based on kinetic theory of granular flow was adopted. The model was firstly validated with the experimental results from the literature. Thereafter, it was applied to investigate the flow and heat transfer characteristics of ice slurry under various conditions. The numerical results showed that more ice particles were suspended on the upper side of pipe at higher inlet velocity and solid volume fraction due to larger turbulent dispersion force and collision interaction among ice particles. During the flow melting process of ice slurry in a horizontal circular pipe under constant wall heat flux, the local heat transfer coefficient decreased rapidly in the entrance region, followed by an approximately constant value. However, when the solid volume fraction near the wall decreased to a small value, ice particles in the center region were difficult to be melted. Hence, the contribution of phase change to heat transfer decreased along the flow direction, resulting in decreasing local heat transfer coefficient. When the solid volume fraction near the wall decreased to zero, a solution region formed near the wall and it extended along the flow direction. Thus the heat from the wall caused rapid increase in the mean fluid temperature, resulting in increasing heat transfer coefficient. After ice slurry was fully melted into aqueous solution, the temperature increase of fluid resulted in decreasing viscosity and increasing turbulent intensity along the flow direction. Therefore, the heat transfer coefficient in the solution region continued increasing in the fully-melted region.
机译：冰浆由冰粒和水溶液组成，可在二次回路制冷中用作冷媒和二次制冷剂。本文研究了水平管道中冰浆的强迫对流和传热，采用基于颗粒流动力学理论的3D Euler-Euler多相模型。该模型首先用文献中的实验结果进行了验证。此后，用于研究各种条件下冰浆的流动和传热特性。数值结果表明，由于更大的湍流分散力和冰粒之间的碰撞相互作用，更多的冰粒以较高的入口速度和较高的固相分数悬浮在管道的上侧。在壁面通量恒定的情况下，在水平圆管中的冰浆流熔过程中，局部传热系数在入口区域迅速下降，随后接近一个恒定值。然而，当壁附近的固体体积分数减小到较小值时，中心区域中的冰颗粒难以融化。因此，相变对热传递的贡献沿着流动方向减小，导致局部热传递系数减小。当壁附近的固体体积分数减小到零时，溶液区域在壁附近形成并且其沿着流动方向延伸。因此，来自壁的热量导致平均流体温度迅速升高，从而导致传热系数增加。冰浆完全融化成水溶液后，流体的温度升高导致粘度降低，沿流动方向的湍流强度增加。因此，溶液区域中的传热系数在完全熔融区域中持续增加。

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