蒸汽流量对蒸汽直接接触冷凝的影响
发布时间：2018-10-31 12:17
【摘要】：为研究蒸汽流量对蒸汽直接接触凝结及汽泡表面变化过程的影响,利用高速摄像仪记录一定过冷度、不同蒸汽流量条件时过冷水中蒸汽的凝结过程.实验结果表明:蒸汽流量小于0.36m~3/h时,汽泡表面始终较光滑;当蒸汽流量升至0.74m~3/h时,汽泡表面上出现波动,汽泡最终逐渐分裂成数个小汽泡;当蒸汽流量大于1.13m~3/h时,汽泡表面上的波动非常剧烈,汽泡不稳定性增强,并最终破碎成大量微汽泡.且随蒸汽流量增,这些微汽泡的直径减少,喷射速度增加.蒸汽流量超过1.13m~3/h后,汽泡在凝结时,其相对半径迅速减小,半径变化率迅速增加.汽泡表面剧烈的波动会极大的增加汽泡有效换热面积,导致蒸汽与过冷水间的传热和传质过程被极具的加强.
[Abstract]:In order to study the influence of steam flow rate on the direct contact condensation of steam and the change process of bubble surface, the condensation process of steam in supercooled water was recorded by using a high-speed camera with a certain degree of undercooling and different steam flow conditions. The experimental results show that when the steam flow rate is less than 0.36m~3/h, the bubble surface is always smooth, and when the steam flow rate rises to 0.74m~3/h, the bubble surface fluctuates and the bubble eventually splits into several small bubbles. When the steam flow rate is larger than 1.13m~3/h, the fluctuation on the bubble surface is very intense, the instability of the bubble is enhanced, and a large number of microbubbles are finally broken up. With the increase of steam flow, the diameter of these microbubbles decreases and the injection velocity increases. When the steam flow rate exceeds 1.13m~3/h, the relative radius decreases rapidly and the radius change rate increases rapidly when the bubble condenses. The severe fluctuation of the bubble surface will greatly increase the effective heat transfer area of the bubble, resulting in the process of heat and mass transfer between steam and supercooled water is greatly enhanced.
【作者单位】： 哈尔滨工程大学核科学与技术学院核安全与仿真技术国防重点学科实验室;四川大学水利水电学院水力学与山区河流开发保护国家重点实验室;
【基金】：国家自然科学基金(51376052,11175050,51106101) 四川大学科研基金(YJ201432)
【分类号】：TK124
本文编号：2302148
[Abstract]:In order to study the influence of steam flow rate on the direct contact condensation of steam and the change process of bubble surface, the condensation process of steam in supercooled water was recorded by using a high-speed camera with a certain degree of undercooling and different steam flow conditions. The experimental results show that when the steam flow rate is less than 0.36m~3/h, the bubble surface is always smooth, and when the steam flow rate rises to 0.74m~3/h, the bubble surface fluctuates and the bubble eventually splits into several small bubbles. When the steam flow rate is larger than 1.13m~3/h, the fluctuation on the bubble surface is very intense, the instability of the bubble is enhanced, and a large number of microbubbles are finally broken up. With the increase of steam flow, the diameter of these microbubbles decreases and the injection velocity increases. When the steam flow rate exceeds 1.13m~3/h, the relative radius decreases rapidly and the radius change rate increases rapidly when the bubble condenses. The severe fluctuation of the bubble surface will greatly increase the effective heat transfer area of the bubble, resulting in the process of heat and mass transfer between steam and supercooled water is greatly enhanced.
【作者单位】： 哈尔滨工程大学核科学与技术学院核安全与仿真技术国防重点学科实验室;四川大学水利水电学院水力学与山区河流开发保护国家重点实验室;
【基金】：国家自然科学基金(51376052,11175050,51106101) 四川大学科研基金(YJ201432)
【分类号】：TK124
【相似文献】
相关期刊论文 前10条
1 樊亚平,邸西玄;蒸汽流量表的选型[J];能源研究与利用;2003年02期
2 安杰，李阳明;提高蒸汽流量精度的方法[J];自动化与仪器仪表;1996年01期
3 张彦春;蒸汽流量自动校正系统[J];应用能源技术;2005年01期
4 王崇宝;;浅析蒸汽流量计量中温度压力补偿的数学模式[J];鸡西大学学报;2007年01期
5 崔淑妮,张涛,徐向东,吕泽华;智能探针式蒸汽流量计的研制[J];工业仪表与自动化装置;1997年04期
6 石书喜;蒸汽流量测量的现状及发展[J];中国仪器仪表;2002年02期
7 金治文;;工业供热蒸汽流量测量误差分析及降低措施[J];经营管理者;2014年01期
8 颜迪民,王健伟,许国华;套管底部淹没时的再湿传热与夹带特性[J];工程热物理学报;1986年04期
9 姚寿广，，朱德书;蒸汽流量测量全参数补偿数学模型的分析及实现[J];华东船舶工业学院学报;1995年01期
10 张科;綦星光;陈广;马长富;;BP神经网络在蒸汽流量测量中的应用研究[J];山东轻工业学院学报(自然科学版);2009年01期
本文编号：2302148
本文链接：https://www.wllwen.com/kejilunwen/dongligc/2302148.html
