{"title":"Optimisation and numerical study of forced convection heat transfer design for glass tempered cooling grille","authors":"Ruolin Gao , Gaowei Yue , Zihao Li , Yanwen Zhang","doi":"10.1016/j.ijthermalsci.2024.109569","DOIUrl":null,"url":null,"abstract":"<div><div>Conventional glass tempering equipment suffers from uneven cooling and low energy efficiency in its design and operation, which highlights the limitations of existing production technologies. There is relatively little previous work describing the heat transfer properties of tempered glass in actual production. In this study, a combination of numerical simulation and experimental testing is used to optimise the design of cooling air grille in glass tempering equipment. Firstly, the variation characteristics of glass surface temperature with cooling time in the physical tempering process were experimentally investigated. Subsequently, the structural design and optimisation of the air deflector plate in the cooling air grille are carried out. Finally, a coupled flow-thermal-solid numerical model of the cooling air grille is constructed based on the experimental conditions, and the effects of the four air pressure plate structures on the heat transfer efficiency and temperature uniformity in the quenching process are explored. The results demonstrated that the designed rectangular plate performs better than the conventional plate. Compared with the traditional plate, the designed rectangular plate can reduce the base temperature of the glass by 4.21 K, increase the heat transfer coefficient by 5.03 %, and increase the heat transfer rate by 2.13 %. In addition, the glass surface temperature inhomogeneity is reduced by 7.32 % by the rectangular plate. The proposed design offers an appropriate resolution for industrial applications. It also provides a solid foundation for advancements in tempered glass quality.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"210 ","pages":"Article 109569"},"PeriodicalIF":4.9000,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Thermal Sciences","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1290072924006914","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}
引用次数: 0
Abstract
Conventional glass tempering equipment suffers from uneven cooling and low energy efficiency in its design and operation, which highlights the limitations of existing production technologies. There is relatively little previous work describing the heat transfer properties of tempered glass in actual production. In this study, a combination of numerical simulation and experimental testing is used to optimise the design of cooling air grille in glass tempering equipment. Firstly, the variation characteristics of glass surface temperature with cooling time in the physical tempering process were experimentally investigated. Subsequently, the structural design and optimisation of the air deflector plate in the cooling air grille are carried out. Finally, a coupled flow-thermal-solid numerical model of the cooling air grille is constructed based on the experimental conditions, and the effects of the four air pressure plate structures on the heat transfer efficiency and temperature uniformity in the quenching process are explored. The results demonstrated that the designed rectangular plate performs better than the conventional plate. Compared with the traditional plate, the designed rectangular plate can reduce the base temperature of the glass by 4.21 K, increase the heat transfer coefficient by 5.03 %, and increase the heat transfer rate by 2.13 %. In addition, the glass surface temperature inhomogeneity is reduced by 7.32 % by the rectangular plate. The proposed design offers an appropriate resolution for industrial applications. It also provides a solid foundation for advancements in tempered glass quality.
期刊介绍：
The International Journal of Thermal Sciences is a journal devoted to the publication of fundamental studies on the physics of transfer processes in general, with an emphasis on thermal aspects and also applied research on various processes, energy systems and the environment. Articles are published in English and French, and are subject to peer review.
The fundamental subjects considered within the scope of the journal are:
* Heat and relevant mass transfer at all scales (nano, micro and macro) and in all types of material (heterogeneous, composites, biological,...) and fluid flow
* Forced, natural or mixed convection in reactive or non-reactive media
* Single or multi–phase fluid flow with or without phase change
* Near–and far–field radiative heat transfer
* Combined modes of heat transfer in complex systems (for example, plasmas, biological, geological,...)
* Multiscale modelling
The applied research topics include:
* Heat exchangers, heat pipes, cooling processes
* Transport phenomena taking place in industrial processes (chemical, food and agricultural, metallurgical, space and aeronautical, automobile industries)
* Nano–and micro–technology for energy, space, biosystems and devices
* Heat transport analysis in advanced systems
* Impact of energy–related processes on environment, and emerging energy systems
The study of thermophysical properties of materials and fluids, thermal measurement techniques, inverse methods, and the developments of experimental methods are within the scope of the International Journal of Thermal Sciences which also covers the modelling, and numerical methods applied to thermal transfer.
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