Xiaowei Yang, Kaimin Wang, Jiawei Liu, Peisen Kang, Xiaohua Liu
{"title":"Experimental study on freezing characteristics of droplet impact on cold cylindrical surfaces","authors":"Xiaowei Yang, Kaimin Wang, Jiawei Liu, Peisen Kang, Xiaohua Liu","doi":"10.1016/j.icheatmasstransfer.2024.107769","DOIUrl":null,"url":null,"abstract":"<div><p>The freezing process of droplet impact on cold cylindrical surfaces are experimentally investigated using high-speed photography. Effects of Weber number (9.93–357.44) and surface temperature (−25 ∼ −5 °C) on the freezing characteristics are analyzed. The results show that, there are five different freezing morphologies after impacting cold cylindrical surfaces: semi-sphere, cone, single-bridge double-ear, double-bridge double-ear, and central concave ring. As Weber number (<em>We</em>) increases or surface temperature decreases, the freezing delay time, freezing time, and total freezing time are shortened, while the freezing velocity and the exterior freezing front moving speed increase. When the freezing morphology is semi-sphere or cone, the exterior freezing front moving speed in axial direction is smaller than that in circumferential direction. When the freezing morphology is single-bridge double-ear, double-bridge double-ear, or central concave ring, the movement of exterior freezing front can be divided into two stages: rapid development stage and slow convergence stage. The exterior freezing front in axial direction moves faster than that in circumferential direction during the rapid development stage. In this paper, the differences of icing in axial and circumferential directions on cylindrical surfaces are analyzed. The freezing characteristics and mechanisms under the influence of curvature are revealed.</p></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":null,"pages":null},"PeriodicalIF":6.4000,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Communications in Heat and Mass Transfer","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0735193324005311","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MECHANICS","Score":null,"Total":0}
引用次数: 0
Abstract
The freezing process of droplet impact on cold cylindrical surfaces are experimentally investigated using high-speed photography. Effects of Weber number (9.93–357.44) and surface temperature (−25 ∼ −5 °C) on the freezing characteristics are analyzed. The results show that, there are five different freezing morphologies after impacting cold cylindrical surfaces: semi-sphere, cone, single-bridge double-ear, double-bridge double-ear, and central concave ring. As Weber number (We) increases or surface temperature decreases, the freezing delay time, freezing time, and total freezing time are shortened, while the freezing velocity and the exterior freezing front moving speed increase. When the freezing morphology is semi-sphere or cone, the exterior freezing front moving speed in axial direction is smaller than that in circumferential direction. When the freezing morphology is single-bridge double-ear, double-bridge double-ear, or central concave ring, the movement of exterior freezing front can be divided into two stages: rapid development stage and slow convergence stage. The exterior freezing front in axial direction moves faster than that in circumferential direction during the rapid development stage. In this paper, the differences of icing in axial and circumferential directions on cylindrical surfaces are analyzed. The freezing characteristics and mechanisms under the influence of curvature are revealed.
期刊介绍:
International Communications in Heat and Mass Transfer serves as a world forum for the rapid dissemination of new ideas, new measurement techniques, preliminary findings of ongoing investigations, discussions, and criticisms in the field of heat and mass transfer. Two types of manuscript will be considered for publication: communications (short reports of new work or discussions of work which has already been published) and summaries (abstracts of reports, theses or manuscripts which are too long for publication in full). Together with its companion publication, International Journal of Heat and Mass Transfer, with which it shares the same Board of Editors, this journal is read by research workers and engineers throughout the world.