{"title":"The impact of spacing ratios on thermal-hydraulic performance of a cam-shaped tube in a four-tube staggered configuration","authors":"Arash Moazezi , Arash Mirabdolah Lavasani","doi":"10.1016/j.icheatmasstransfer.2025.108869","DOIUrl":null,"url":null,"abstract":"<div><div>Comprehensive experimental and numerical studies were conducted to investigate the effects of longitudinal and transverse spacing ratios (<em>S</em><sub><em>L</em></sub><sup><em>⁎</em></sup> and <em>S</em><sub><em>T</em></sub><sup><em>⁎</em></sup>) on fluid flow and heat transfer characteristics of the downstream tube in a staggered tube bank consisting of four cam-shaped tubes. Using cam-shaped tubes improved the thermal-hydraulic performance of the tube bundle by enabling a more compact arrangement and reducing drag coefficient. Various configurations (Model D to O) were examined, with <em>S</em><sub><em>L</em></sub><sup><em>⁎</em></sup> ranging from 3 to 6 and <em>S</em><sub><em>T</em></sub><sup><em>⁎</em></sup> ranging from 1.25 to 2 at a constant Reynolds number of 26,870 with a uniform heat flux on the rear tube. Numerical simulations using an unsteady three-equation <em>k-kl-ω</em> turbulence model demonstrated strong agreement with our experimental data, confirming the model's accuracy. The results revealed that the configuration with <em>S</em><sub><em>T</em></sub><sup><em>⁎</em></sup> = 1.25 and <em>S</em><sub><em>L</em></sub><sup><em>⁎</em></sup> = 3 (Model D) significantly reduced the drag coefficient of the rear tube by 122 % compared to a single cam-shaped tube (reference case). The maximum Nusselt number was obtained at <em>S</em><sub><em>T</em></sub><sup><em>⁎</em></sup> = 2 and <em>S</em><sub><em>L</em></sub><sup><em>⁎</em></sup> = 3 (Model L), resulting in a 39.05 % enhancement compared to the reference case. Furthermore, reducing <em>S</em><sub><em>L</em></sub><sup><em>⁎</em></sup> from 6 to 3 while keeping <em>S</em><sub><em>T</em></sub><sup><em>⁎</em></sup> values constant significantly enhanced thermal-hydraulic performance. Notably, Model D achieved the highest performance, with an improvement of 212.8 % compared to the reference case, while minimizing the tube bundle volume.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"164 ","pages":"Article 108869"},"PeriodicalIF":6.4000,"publicationDate":"2025-03-17","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/S0735193325002945","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
Comprehensive experimental and numerical studies were conducted to investigate the effects of longitudinal and transverse spacing ratios (SL⁎ and ST⁎) on fluid flow and heat transfer characteristics of the downstream tube in a staggered tube bank consisting of four cam-shaped tubes. Using cam-shaped tubes improved the thermal-hydraulic performance of the tube bundle by enabling a more compact arrangement and reducing drag coefficient. Various configurations (Model D to O) were examined, with SL⁎ ranging from 3 to 6 and ST⁎ ranging from 1.25 to 2 at a constant Reynolds number of 26,870 with a uniform heat flux on the rear tube. Numerical simulations using an unsteady three-equation k-kl-ω turbulence model demonstrated strong agreement with our experimental data, confirming the model's accuracy. The results revealed that the configuration with ST⁎ = 1.25 and SL⁎ = 3 (Model D) significantly reduced the drag coefficient of the rear tube by 122 % compared to a single cam-shaped tube (reference case). The maximum Nusselt number was obtained at ST⁎ = 2 and SL⁎ = 3 (Model L), resulting in a 39.05 % enhancement compared to the reference case. Furthermore, reducing SL⁎ from 6 to 3 while keeping ST⁎ values constant significantly enhanced thermal-hydraulic performance. Notably, Model D achieved the highest performance, with an improvement of 212.8 % compared to the reference case, while minimizing the tube bundle volume.
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.