Experimental Study on Flow Patterns of Direct Contact Condensation Between Steam Jet and Subcooled Water Flow in Rectangular Channel

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Experimental Study on Flow Patterns of Direct Contact Condensation Between Steam Jet and Subcooled Water Flow in Rectangular Channel

更新时间：2025-07-09

- Experimental Study on Flow Patterns of Direct Contact Condensation Between Steam Jet and Subcooled Water Flow in Rectangular Channel
- Vol. 48, Issue 5, Pages: 50-55(2014)
- 作者机构：
  
  西安交通大学热流科学与工程教育部重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201405009
  CLC： TK2
- Online First：10 May 2014，
  
  Published：2014
- 稿件说明：
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Experimental Study on Flow Patterns of Direct Contact Condensation Between Steam Jet and Subcooled Water Flow in Rectangular Channel[J]. 2014, 48(5): 50-55.
DOI：

Experimental Study on Flow Patterns of Direct Contact Condensation Between Steam Jet and Subcooled Water Flow in Rectangular Channel[J]. 2014, 48(5): 50-55. DOI： 10.7652/xjtuxb201405009.

摘要

为研究有限通道内高速蒸汽与过冷水直接接触凝结换热(DCC)过程中汽液相界面的演化规律

搭建了具有矩形截面结构喷嘴及通道的可视化实验台

获得了入口蒸汽压力为0.1～0.45 MPa、入口过冷水压力为0.1～0.4 MPa以及入口过冷水温度为30 ℃条件下DCC过程的凝结形态

得到了基于入口参数的流型图。研究表明:矩形通道内DCC过程的典型流动形态可划分为蒸汽区、过冷水区、汽液混合层、回流区和均匀泡状流区

蒸汽区与汽液混合层之间有清晰的相界面; 在不同的入口参数下会出现泡状流、界面振荡射流、尾部振荡射流、稳定射流和发散射流等凝结形态。获得了各种流型的下壁面温度分布规律

并通过计算

得到稳定射流的换热系数为5.2～9.0 MW·m

-2

·℃

-1

。

Abstract

To fundamentally understand the details of steam-water interface

visual investigation is conducted in a rectangular channel with rectangular nozzles. The flow fields of DCC are filmed when the steam pressure

subcooled water pressure and subcooled water temperature at the device inlet get 0.1-0.45 MPa

0.1-0.4 MPa

and 30 ℃ respectively. Moreover

a condensation regime map based on the inlet parameters is achieved. The result indicates that the process of DCC in a rectangular channel can be divided into five regions: steam region

subcooled water region

mixture layer

backflow region and homogenous bubble region. The interface between steam region and mixture layer is clearly observed. Under various inlet steam

and water conditions

the flow patterns of DCC can be characterized as bubble flow

interface oscillation

tail oscillation

stable jet and divergent jet. The temperature distribution on the bottom wall is obtained

and the average heat transfer coefficient of stable jet is found to be within the range of 5.2-9.0 MW·m

-2

· ℃

-1

关键词

Keywords

references

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