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Mohseni, Mahdi. (1401). Thermal Behavior of Laminar Flow of Supercritical CO2 in a Long Vertical Mini-Pipe under Constant and Stepped Wall Heat Flux. هنرهای کاربردی, 9(2), 245-254. doi: 10.22075/jhmtr.2023.27963.1385
Mahdi Mohseni. "Thermal Behavior of Laminar Flow of Supercritical CO2 in a Long Vertical Mini-Pipe under Constant and Stepped Wall Heat Flux". هنرهای کاربردی, 9, 2, 1401, 245-254. doi: 10.22075/jhmtr.2023.27963.1385
Mohseni, Mahdi. (1401). 'Thermal Behavior of Laminar Flow of Supercritical CO2 in a Long Vertical Mini-Pipe under Constant and Stepped Wall Heat Flux', هنرهای کاربردی, 9(2), pp. 245-254. doi: 10.22075/jhmtr.2023.27963.1385
Mohseni, Mahdi. Thermal Behavior of Laminar Flow of Supercritical CO2 in a Long Vertical Mini-Pipe under Constant and Stepped Wall Heat Flux. هنرهای کاربردی, 1401; 9(2): 245-254. doi: 10.22075/jhmtr.2023.27963.1385

Thermal Behavior of Laminar Flow of Supercritical CO2 in a Long Vertical Mini-Pipe under Constant and Stepped Wall Heat Flux

Journal of Heat and Mass Transfer Research
مقاله 13، دوره 9، شماره 2 - شماره پیاپی 18، بهمن 2022، صفحه 245-254    اصل مقاله (1.83 M)
نوع مقاله: Full Length Research Article
شناسه دیجیتال (DOI): 10.22075/jhmtr.2023.27963.1385
نویسنده
Mahdi Mohseni*
Department of Mechanical Engineering, Qom University of Technology, Qom, Iran
تاریخ دریافت: 09 مرداد 1401،  تاریخ بازنگری: 25 فروردین 1402،  تاریخ پذیرش: 01 اردیبهشت 1402 
چکیده
In this study, the convective heat transfer of supercritical carbon dioxide in a long vertical mini-pipe has been investigated numerically. The numerical solution has been performed with the finite volume method and by developing a CFD code. The pipe has a length of 5.5 m and a diameter of 1 mm which is exposed to a constant heat flux at the wall with values of 300, 400, 500, and 600 W/m2 or step changes. In addition to the wall heat flux, the effects of gravity and flow direction have also been examined. Furthermore, some differences between the results of laminar and turbulent flows have been addressed. The results show that in the laminar flow, unlike the turbulent flow in the improvement regime of heat transfer, the system's thermal performance increases with increasing the wall heat flux, while in the deterioration mode, the two have similar behavior. Moreover, in part of the downward flow, reverse flow occurs, and its length can be understood by using the negative amount of wall shear stress. Furthermore, the thermal efficiency of the supercritical carbon dioxide is better at the upward flow and near the critical point than the constant property flow. In addition, from the applied stepped wall heat flux, it is concluded that the deterioration can be partially controlled or reduced by correctly determining the location of the step or any wall heat flux variations.
کلیدواژه‌ها
Supercritical fluid؛ Long mini pipe؛ Flow direction؛ Buoyancy effect؛ Wall temperature؛ Stepped wall heat flux
عنوان مقاله [English]
رفتار حرارتی جریان آرام دی‌اکسیدکربن فوق بحرانی در یک مینی لوله عمودی بلند تحت شار حرارتی دیوار ثابت و پلکانی
چکیده [English]
در این مطالعه، انتقال حرارت جابجایی اجباری دی اکسید کربن فوق بحرانی در یک مینی لوله عمودی بلند به صورت عددی بررسی شده است. حل عددی با روش حجم محدود و با توسعه یک کد CFD انجام شده است. طول و قطر لوله به ترتیب برابر 5.5 متر و 1 میلی متر می‌باشد که در معرض یک شار حرارتی ثابت در دیوار با مقادیر 300، 400، 500 و 600 وات بر متر مربع یا به صورت تغییرات پله ای قرار می‌گیرد. علاوه بر شار حرارتی دیوار، اثرات گرانش و جهت جریان نیز مورد بررسی قرار گرفته است. همچنین، به برخی تفاوت‌ها بین نتایج جریان آرام با جریان آشفته اشاره شده است. نتایج نشان می‌دهد که در جریان آرام، برخلاف جریان آشفته در رژیم بهبود انتقال حرارت، عملکرد حرارتی سیستم با افزایش شار حرارتی دیوار افزایش می‌یابد در حالی که در حالت اخلال انتقال حرارت، این دو رفتار مشابهی دارند. علاوه بر این، در بخشی از جریان رو به پایین، جریان معکوس رخ می دهد و طول آن را می‌توان با استفاده از مقدار منفی تنش برشی دیوار بدست آورد. همچنین، تنها در جریان رو به بالا و نزدیک به نقطه بحرانی، بازده حرارتی لوله شامل دی اکسید کربن فوق بحرانی بهتر از جریان خواص ثابت است. از نتایج شار حرارتی دیوار پلکانی اعمال شده می‌توان نتیجه گرفت که با تعیین صحیح محل پله یا هر گونه تغییرات دیگر شار حرارتی دیوار، ممکن است اخلال در انتقال حرارت کنترل یا تا حدی کاهش پیدا کند.
کلیدواژه‌ها [English]
سیال فوق بحرانی, مینی لوله بلند, جهت جریان, اثر شناوری, دمای دیواره, شار حرارتی پلکانی
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