...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers >Characteristics of flow and heat transfer in a tube bundle evaporator with a vapour-liquid-solid flow
【24h】

Characteristics of flow and heat transfer in a tube bundle evaporator with a vapour-liquid-solid flow

机译：汽-液-固流管束蒸发器中的流动和传热特性

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

In this paper, a tube bundle experimental evaporator with a specific vapour-liquid-solid (V-L-S) flow boiling system with external natural circulating is established to imitate and investigate a typical three-phase flow and boiling heat-transfer characteristics in order to reveal the mechanism of this apparatus. It is shown that under the ranges of the experimental parameters tested, the average heat transfer film coefficient h(fb) increases with increasing of temperature difference between the inside surface of tube wall and the boiling fluid. Lowering holdup of the solid particles enhances the heat transfer process. Meanwhile, the average heat transfer film coefficient h in each tube was found to be quite different for different tubes. The addition of solid particles enlarges this difference. The circulating velocity in the tube in V-L-S flow boiling was found to increase with the increase of the overall driving force of heat transfer or temperature difference between the steam and the boiling fluid, and it is higher than that of the V-L flow boiling. Opposite is true for the pressure drop in the tube in V-L-S flow boiling. There is no obvious effect of circulating velocity but there is a clear distinction in the pressure drops when varying the solid holdups. These results may offer some useful data sets to design, scale-up of this type of evaporators.
机译：为了模拟和研究典型的三相流和沸腾传热特性，本文建立了具有外部自然循环的特定蒸气-液体-固体（VLS）流动沸腾系统的管束实验蒸发器，以揭示其主要特征。该装置的机制。结果表明，在所测试的实验参数范围内，平均传热膜系数h（fb）随管壁内表面和沸腾液之间的温差的增大而增大。降低固体颗粒的滞留量可增强传热过程。同时，发现每个管中的平均传热膜系数h对于不同的管是完全不同的。固体颗粒的添加扩大了这种差异。发现在V-L-S流动沸腾中，管中的循环速度随着总的传热驱动力的增加或蒸汽与沸腾流体之间的温差的增加而增加，并且比V-L流动沸腾的更高。在V-L-S流动沸腾中，管中的压降则相反。循环速度没有明显的影响，但是当改变固含量时，压降有明显的区别。这些结果可能会提供一些有用的数据集，以设计，放大此类蒸发器。

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