{"title":"大长径比高温热管传热特性的实验研究","authors":"","doi":"10.1016/j.tsep.2024.102792","DOIUrl":null,"url":null,"abstract":"<div><p>Large length–diameter ratio high-temperature heat pipes (large l/d ratio HTHPs) demonstrate wide-ranging application potential in areas such as nuclear energy and solar energy development. Distinct in their geometric configurations, large l/d ratio HTHPs’ performance attributes significantly diverge from traditional high-temperature heat pipes (HTHPs). In this paper, a large l/d ratio HTHP is engineered with dimensions of Φ16 × 2400 mm, achieving an aspect ratio (l/d) of 150. The wick structure incorporates dual layers of 80-mesh 316 stainless steel wire mesh. Employing liquid sodium as the working fluid, experiments are conducted with filling ratios set at 15 %, 25 %, and 35 %, to evaluate its efficacy in heat transfer processes. This research delineates the analysis of evaporator thermal resistance and the effective thermal conductivity of large l/d ratio HTHPs across varying filling ratios and angles (0°, 15°, 30°, 45°, 60°, 75°, 90°). HTHPs with filling ratio of 25 % are selected to investigate the steady-state thermal transfer characteristics at different powers (2.0 kW, 2.5 kW, 3.0 kW), along with the variation patterns of the effective thermal conductivity and thermal resistance. The findings reveal that large l/d ratio HTHPs, specifically those with a 25 % filling ratio, demonstrate superior heat transfer capabilities at a tilt angle of 15°. With a heating power set at 3.0 kW, the thermal transfer efficiency progressively diminishes as the tilt angle is increased beyond this optimum point. It is observed that the increase in thermal resistance, which adversely affects heat transfer performance, primarily emanates from the evaporator section and intensifies with an increase in the tilt angle.</p></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":null,"pages":null},"PeriodicalIF":5.1000,"publicationDate":"2024-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Experimental study on heat transfer characteristics of the large length-diameter ratio high-temperature heat pipe\",\"authors\":\"\",\"doi\":\"10.1016/j.tsep.2024.102792\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Large length–diameter ratio high-temperature heat pipes (large l/d ratio HTHPs) demonstrate wide-ranging application potential in areas such as nuclear energy and solar energy development. Distinct in their geometric configurations, large l/d ratio HTHPs’ performance attributes significantly diverge from traditional high-temperature heat pipes (HTHPs). In this paper, a large l/d ratio HTHP is engineered with dimensions of Φ16 × 2400 mm, achieving an aspect ratio (l/d) of 150. The wick structure incorporates dual layers of 80-mesh 316 stainless steel wire mesh. Employing liquid sodium as the working fluid, experiments are conducted with filling ratios set at 15 %, 25 %, and 35 %, to evaluate its efficacy in heat transfer processes. This research delineates the analysis of evaporator thermal resistance and the effective thermal conductivity of large l/d ratio HTHPs across varying filling ratios and angles (0°, 15°, 30°, 45°, 60°, 75°, 90°). HTHPs with filling ratio of 25 % are selected to investigate the steady-state thermal transfer characteristics at different powers (2.0 kW, 2.5 kW, 3.0 kW), along with the variation patterns of the effective thermal conductivity and thermal resistance. The findings reveal that large l/d ratio HTHPs, specifically those with a 25 % filling ratio, demonstrate superior heat transfer capabilities at a tilt angle of 15°. With a heating power set at 3.0 kW, the thermal transfer efficiency progressively diminishes as the tilt angle is increased beyond this optimum point. It is observed that the increase in thermal resistance, which adversely affects heat transfer performance, primarily emanates from the evaporator section and intensifies with an increase in the tilt angle.</p></div>\",\"PeriodicalId\":23062,\"journal\":{\"name\":\"Thermal Science and Engineering Progress\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":5.1000,\"publicationDate\":\"2024-08-10\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Thermal Science and Engineering Progress\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S2451904924004104\",\"RegionNum\":3,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"ENERGY & FUELS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Thermal Science and Engineering Progress","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2451904924004104","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
Experimental study on heat transfer characteristics of the large length-diameter ratio high-temperature heat pipe
Large length–diameter ratio high-temperature heat pipes (large l/d ratio HTHPs) demonstrate wide-ranging application potential in areas such as nuclear energy and solar energy development. Distinct in their geometric configurations, large l/d ratio HTHPs’ performance attributes significantly diverge from traditional high-temperature heat pipes (HTHPs). In this paper, a large l/d ratio HTHP is engineered with dimensions of Φ16 × 2400 mm, achieving an aspect ratio (l/d) of 150. The wick structure incorporates dual layers of 80-mesh 316 stainless steel wire mesh. Employing liquid sodium as the working fluid, experiments are conducted with filling ratios set at 15 %, 25 %, and 35 %, to evaluate its efficacy in heat transfer processes. This research delineates the analysis of evaporator thermal resistance and the effective thermal conductivity of large l/d ratio HTHPs across varying filling ratios and angles (0°, 15°, 30°, 45°, 60°, 75°, 90°). HTHPs with filling ratio of 25 % are selected to investigate the steady-state thermal transfer characteristics at different powers (2.0 kW, 2.5 kW, 3.0 kW), along with the variation patterns of the effective thermal conductivity and thermal resistance. The findings reveal that large l/d ratio HTHPs, specifically those with a 25 % filling ratio, demonstrate superior heat transfer capabilities at a tilt angle of 15°. With a heating power set at 3.0 kW, the thermal transfer efficiency progressively diminishes as the tilt angle is increased beyond this optimum point. It is observed that the increase in thermal resistance, which adversely affects heat transfer performance, primarily emanates from the evaporator section and intensifies with an increase in the tilt angle.
期刊介绍:
Thermal Science and Engineering Progress (TSEP) publishes original, high-quality research articles that span activities ranging from fundamental scientific research and discussion of the more controversial thermodynamic theories, to developments in thermal engineering that are in many instances examples of the way scientists and engineers are addressing the challenges facing a growing population – smart cities and global warming – maximising thermodynamic efficiencies and minimising all heat losses. It is intended that these will be of current relevance and interest to industry, academia and other practitioners. It is evident that many specialised journals in thermal and, to some extent, in fluid disciplines tend to focus on topics that can be classified as fundamental in nature, or are ‘applied’ and near-market. Thermal Science and Engineering Progress will bridge the gap between these two areas, allowing authors to make an easy choice, should they or a journal editor feel that their papers are ‘out of scope’ when considering other journals. The range of topics covered by Thermal Science and Engineering Progress addresses the rapid rate of development being made in thermal transfer processes as they affect traditional fields, and important growth in the topical research areas of aerospace, thermal biological and medical systems, electronics and nano-technologies, renewable energy systems, food production (including agriculture), and the need to minimise man-made thermal impacts on climate change. Review articles on appropriate topics for TSEP are encouraged, although until TSEP is fully established, these will be limited in number. Before submitting such articles, please contact one of the Editors, or a member of the Editorial Advisory Board with an outline of your proposal and your expertise in the area of your review.