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Effect of Fin Geometry on the Performance of Tubular-Fin Heat Exchangers: A Computational Fluid Dynamics Study | ||
Journal of Heat and Mass Transfer Research | ||
دوره 8، شماره 2 - شماره پیاپی 16، بهمن 2021، صفحه 163-171 اصل مقاله (1.51 M) | ||
نوع مقاله: Full Length Research Article | ||
شناسه دیجیتال (DOI): 10.22075/jhmtr.2021.21528.1309 | ||
نویسندگان | ||
S. Alireza Zarabadi1؛ Ali Rajabpour2؛ Seyedabbas Sadatsakkak* 1 | ||
1Department of Mechanical Engineering, Faculty of Engineering and Technology, ,Imam Khomeini International University, Qazvin, Iran | ||
2Department of Mechanical Engineering, Faculty of Engineering and Technology, ,Imam Khomeini International University,Qazvin, Iran | ||
تاریخ دریافت: 16 مهر 1399، تاریخ بازنگری: 30 خرداد 1400، تاریخ پذیرش: 31 خرداد 1400 | ||
چکیده | ||
Tubular-Fin heat exchangers are a type of compact heat exchangers with prominent features like high levels of exchanged heat and less space occupancy. These heat exchangers are commonly used for exchanging heat between gas and liquid. In this study, for a tubular-fin heat exchanger, the heat transfer and pressure drop for circular and serrated fins with the triangular arrangement are numerically calculated and compared with the existing experimental data. A three-dimensional numerical study with the Reynolds mean-averaged Navier-Stokes (k-ε) model for turbulence is conducted. In the Reynolds range of 6000 to 25000, the performance of four types of fin geometry (serrated, semi-serrated, circular and semi-circular) are compared. The results show that the circular fin has the highest heat transfer rate, while the serrated fin has the highest reduction in the gas temperature. It is also found that the semi-circular fin has the highest thermal enhancement factor and the semi-serrated fin has the highest heat transfer coefficient. The results of the present study can be beneficial in the selection of optimal fins in a heat exchanger from both practical and economic aspects. | ||
کلیدواژهها | ||
Heat exchanger؛ Fin geometry؛ Heat transfer coefficient؛ Pressure drop | ||
عنوان مقاله [English] | ||
تأثیر هندسه فین بر عملکرد مبدل های حرارتی لوله ای پره دار: یک مطالعه دینامیک سیالات محاسباتی | ||
چکیده [English] | ||
مبدل های لوله ای پره دار جزء مبدل های فشرده هستند که از ویژگی های بارز آنها میتوان به سطح تبادل حرارتی بالا و اشغال فضای کم اشاره کرد. این مبدل ها معمولا برای تبادل حرارت بین دو سیال گاز و مایع مورد استفاده قرار میگیرند. در این پژوهش در یک مبدل لوله ای پره دار ضریب انتقال حرارت و ضریب افت فشار برای پره های دایره ای و دندانه ای با آرایش مثلثی به روش عددی محاسبه و با نتایج تجربی موجود مقایسه شده اند. مطالعه عددی به صورت سه بعدی انجام شده و مدل ناویر استوکس میانگین -گیری شده رینولدز (k-ε) برای مدل سازی آشفتگی در آن به کار رفته است. در مطالعه حاضر به بررسی پارامتر های موثر انتقال حرارت در جریان آشفته پرداخته شده و در محدوده رینولدز 6000 تا 25000، عملکرد چهار نوع هندسه پره های دندانه دار ، نیمه دندانه دار ، دایره ای و نیم دایره ای با یکدیگر مقایسه شده اند. مشاهده شد که پره دایره ای بیشترین میزان انتقال حرارت، پره دندانه ای بیشترین مقدار کاهش دما ی گاز عبوری، پره نیم دایره ای دارای بیشترین مقدار ضریب تقویت حرارتی (TEF)و پره نیم دندانه ای بیشترین میزان ضریب انتقال حرارت را دارا هستند. نتایج پژوهش حاضر می تواند در انتخاب پره بهینه در یک مبدل حرارتی از جنبه های کاربردی و اقتصادی مفید واقع گردد | ||
کلیدواژهها [English] | ||
مبدل حرارتی, هندسه فین, ضریب انتقال حرارت, افت فشار | ||
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