{"title":"干后区液滴粒径的实验研究","authors":"Zihan Xia, Nikolai Rensch, Xu Cheng","doi":"10.1016/j.ijheatmasstransfer.2025.127880","DOIUrl":null,"url":null,"abstract":"<div><div>Due to the limited availability of experimental data on droplet size in dispersed flow under post-dryout (PDO) conditions, and its critical role in accurately predicting PDO heat transfer, this study designs and conducts a visualization experiment to investigate droplet behavior in PDO regime. A square flow channel with a centrally positioned electrically heated tube is constructed, installing multiple observation windows on both side walls to provide optical access to the droplets. Experiments are conducted under heat fluxes exceeding the critical heat flux (CHF), ensuring the observation area within the PDO regime. Droplet motion in the vapor flow is recorded by the high-speed camera through transparent windows. The droplet size and their distributions are extracted and analyzed under various operating conditions. The obtained data are combined with literature datasets to evaluate existing droplet size correlations. The results show that current droplet size correlations do not accurately predict the data. Therefore, a new droplet size correlation based on the droplet Weber number is developed, demonstrating good predictive performance over a range of operating conditions.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"255 ","pages":"Article 127880"},"PeriodicalIF":5.8000,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Experimental investigation on droplet size in post-dryout region\",\"authors\":\"Zihan Xia, Nikolai Rensch, Xu Cheng\",\"doi\":\"10.1016/j.ijheatmasstransfer.2025.127880\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Due to the limited availability of experimental data on droplet size in dispersed flow under post-dryout (PDO) conditions, and its critical role in accurately predicting PDO heat transfer, this study designs and conducts a visualization experiment to investigate droplet behavior in PDO regime. A square flow channel with a centrally positioned electrically heated tube is constructed, installing multiple observation windows on both side walls to provide optical access to the droplets. Experiments are conducted under heat fluxes exceeding the critical heat flux (CHF), ensuring the observation area within the PDO regime. Droplet motion in the vapor flow is recorded by the high-speed camera through transparent windows. The droplet size and their distributions are extracted and analyzed under various operating conditions. The obtained data are combined with literature datasets to evaluate existing droplet size correlations. The results show that current droplet size correlations do not accurately predict the data. Therefore, a new droplet size correlation based on the droplet Weber number is developed, demonstrating good predictive performance over a range of operating conditions.</div></div>\",\"PeriodicalId\":336,\"journal\":{\"name\":\"International Journal of Heat and Mass Transfer\",\"volume\":\"255 \",\"pages\":\"Article 127880\"},\"PeriodicalIF\":5.8000,\"publicationDate\":\"2025-09-27\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"International Journal of Heat and Mass Transfer\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0017931025012153\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENGINEERING, MECHANICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Heat and Mass Transfer","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0017931025012153","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
Experimental investigation on droplet size in post-dryout region
Due to the limited availability of experimental data on droplet size in dispersed flow under post-dryout (PDO) conditions, and its critical role in accurately predicting PDO heat transfer, this study designs and conducts a visualization experiment to investigate droplet behavior in PDO regime. A square flow channel with a centrally positioned electrically heated tube is constructed, installing multiple observation windows on both side walls to provide optical access to the droplets. Experiments are conducted under heat fluxes exceeding the critical heat flux (CHF), ensuring the observation area within the PDO regime. Droplet motion in the vapor flow is recorded by the high-speed camera through transparent windows. The droplet size and their distributions are extracted and analyzed under various operating conditions. The obtained data are combined with literature datasets to evaluate existing droplet size correlations. The results show that current droplet size correlations do not accurately predict the data. Therefore, a new droplet size correlation based on the droplet Weber number is developed, demonstrating good predictive performance over a range of operating conditions.
期刊介绍:
International Journal of Heat and Mass Transfer is the vehicle for the exchange of basic ideas in heat and mass transfer between research workers and engineers throughout the world. It focuses on both analytical and experimental research, with an emphasis on contributions which increase the basic understanding of transfer processes and their application to engineering problems.
Topics include:
-New methods of measuring and/or correlating transport-property data
-Energy engineering
-Environmental applications of heat and/or mass transfer