亲爱的研友该休息了!由于当前在线用户较少,发布求助请尽量完整地填写文献信息,科研通机器人24小时在线,伴您度过漫漫科研夜!身体可是革命的本钱,早点休息,好梦!

Planar laser-induced fluorescence diagnostics of water droplets heating and evaporation at high-temperature

蒸发 材料科学 热的 核工程 半径 环境科学 工艺工程 温度测量 机械工程 机械 气象学 热力学 工程类 计算机科学 计算机安全 物理
作者
Р. С. Волков,П. А. Стрижак
出处
期刊:Applied Thermal Engineering [Elsevier BV]
卷期号:127: 141-156 被引量:77
标识
DOI:10.1016/j.applthermaleng.2017.08.040
摘要

Gas-steam-droplet technologies are widely used in systems operating at high temperatures ranging between 400 and 2000 °C, namely: fire-fighting systems, thermal fluid cleaning, fuel compounding, industrial waste gasification and evaporation systems for advanced fuel components, cleaning of thermally loaded surfaces of power equipment, etc. System parameters are usually selected empirically via multiple tests and continuous trial operation of appropriate units, aggregates, assemblies, and installations. This situation is caused by insufficient basic knowledge of conditions and parameters of high-temperature (over 500 °C) heating and evaporation of water and water-based emulsions, solutions, and slurries. Limited information is available regarding the evaporation rates dependent on the temperature of gaseous medium. Consequently, the up-to-date evaporation models allow the researchers to achieve adequate values (in good agreement with the experiment) of evaporation rates at air temperatures not exceeding 300–400 °C. The paper presents a set of experiments on water droplets with the size ranging from 1 to 2 mm, which is used to create the information database on high-temperature evaporation parameters. The approach to measuring the evaporation rate involves observation of the droplet size or more exactly its mean radius, and recording the time of its existence. A high-speed video camera and Tema Automotive software with different tracking algorithms are used for experimental observations. During gas heating, the distribution of highly non-homogeneous and non-steady temperature field in evaporating water droplets is detected by the hardware and software cross-correlation system and Planar Laser-induced Fluorescence optical diagnostics. Instantaneous and medium evaporation rates are computed for the whole period of the droplet lifetime. Highly nonlinear evaporation rate dependences are suggested for gas temperatures and the water droplet surface, size, and time of gas heating. Approximate relationships are described for the prediction of evaporation rates depending on the basic parameters. The evaporation rate is shown to increase several-fold during the heating of a water droplet in a high-temperature gaseous medium. The experimental data are described most accurately by exponential dependences of water evaporation rate versus the airflow temperature and velocity. This result makes it possible to predict the corresponding highly nonlinear dependences of evaporation rate versus the density of convective heat flux and the overall thermal conditions in the industrial chambers, evaporators, heat exchangers, etc. The mathematical expressions obtained can be used to identify the effective conditions of water droplet heating in a large group of high-temperatures applications as well as for developing high-temperature liquid evaporation models.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
1秒前
Alex应助123采纳,获得20
2秒前
doctor小陈完成签到,获得积分10
2秒前
西域小飞侠完成签到,获得积分20
6秒前
NexusExplorer应助徐志豪采纳,获得10
8秒前
9秒前
kdjm688发布了新的文献求助10
17秒前
17秒前
22秒前
22秒前
39秒前
51秒前
54秒前
量子星尘发布了新的文献求助10
57秒前
59秒前
souther完成签到,获得积分0
1分钟前
深情安青应助lf采纳,获得10
1分钟前
青树柠檬完成签到 ,获得积分10
1分钟前
1分钟前
1分钟前
lf发布了新的文献求助10
1分钟前
1分钟前
1分钟前
1分钟前
安安发布了新的文献求助10
1分钟前
优美的谷完成签到,获得积分10
1分钟前
1分钟前
哈哈完成签到 ,获得积分10
1分钟前
Hshi完成签到 ,获得积分10
1分钟前
Alex完成签到,获得积分0
1分钟前
安安完成签到,获得积分10
2分钟前
欧阳完成签到 ,获得积分10
2分钟前
cherlie应助带虾的烧麦采纳,获得10
2分钟前
Ava应助科研通管家采纳,获得10
2分钟前
2分钟前
骆十八完成签到,获得积分10
2分钟前
狸宝的小果子完成签到 ,获得积分10
2分钟前
wanci应助义气的蝴蝶采纳,获得10
2分钟前
Xiaowen完成签到,获得积分10
2分钟前
酷炫的红牛完成签到,获得积分10
2分钟前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
Picture Books with Same-sex Parented Families: Unintentional Censorship 700
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
Nucleophilic substitution in azasydnone-modified dinitroanisoles 500
不知道标题是什么 500
Indomethacinのヒトにおける経皮吸収 400
Phylogenetic study of the order Polydesmida (Myriapoda: Diplopoda) 370
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3976608
求助须知:如何正确求助?哪些是违规求助? 3520720
关于积分的说明 11204567
捐赠科研通 3257359
什么是DOI,文献DOI怎么找? 1798716
邀请新用户注册赠送积分活动 877897
科研通“疑难数据库(出版商)”最低求助积分说明 806613