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بررسی عددی اثر تعداد پره و نسبت پیچش نوار مارپیچ بر عملکرد مبدل حرارتی دو لوله‌ای | ||
| مدل سازی در مهندسی | ||
| دوره 22، شماره 79، دی 1403، صفحه 1-15 اصل مقاله (1.23 M) | ||
| نوع مقاله: مقاله مکانیک | ||
| شناسه دیجیتال (DOI): 10.22075/jme.2024.28425.2335 | ||
| نویسندگان | ||
| محمد رضا توکلی* ؛ سعید محبی | ||
| دانشکده‌ی مکانیک، دانشگاه صنعتی اصفهان، اصفهان، ایران | ||
| تاریخ دریافت: 24 شهریور 1401، تاریخ بازنگری: 21 اسفند 1402، تاریخ پذیرش: 19 فروردین 1403 | ||
| چکیده | ||
| در این مقاله به کمک شبیه‌سازی عددی به بررسی اثر نوار مارپیچ ثابت در لوله داخلی در یک مبدل حرارتی دو لوله‌ای پرداخته شده است. از این رو نوار مارپیچ دارای سه و چهار پره با نسبت‌های پیچش مختلف در لوله داخلی مبدل حرارتی قرار داده شده و پارامترهای عدد ناسلت، ضریب اصطکاک و ضریب عملکرد کلی مبدل حرارتی بررسی شده است. سرعت جریان در لوله خارجی ثابت در نظر گرفته شده ولی عدد رینولدز جریان در ورودی لوله داخلی در محدوده 5000 تا 12000 متغیر اختیار شده است. نتایج نشان داد در تمامی نمونه‌ها اضافه کردن نوار مارپیچ به درون لوله داخلی باعث افزایش عدد ناسلت و ضریب اصطکاک می‌شود و بیشترین افزایش این دو پارامتر به ترتیب 244 و 490 درصد است. با افزایش عدد رینولدز ضریب اصطکاک و ضریب عملکرد کلی مبدل حرارتی کاهش یافته در حالی که عدد ناسلت در همه نمونه‌ها افزایش می‌یابد. این افزایش در نمونه دارای نوار مارپیچ با نسبت پیچش 4 به حدود 80 درصد می‌رسد. همچنین کاهش نسبت پیچش نوار مارپیچ باعث افزایش آشفتگی جریان شده و از این رو باعث افزایش عدد ناسلت، افت فشار، ضریب اصطکاک و ضریب عملکرد کلی مبدل حرارتی می‌شود. بیشترین افزایش ضریب اصطکاک در اثر کاهش نسبت پیچش از 8 به 4، برابر با 43 درصد بوده که در عدد رینولدز 5000 و نوار مارپیچ سه پره رخ داده است. افزایش تعداد پره نوار مارپیچ اثر مستقیمی بر روی افت فشار و ضریب اصطکاک داشته و باعث کاهش ضریب عملکرد کلی مبدل می‌شود. | ||
| کلیدواژه‌ها | ||
| مبدل حرارتی؛ عدد ناسلت؛ ضریب اصطکاک؛ ضریب عملکرد کلی؛ نوار مارپیچ | ||
| عنوان مقاله [English] | ||
| Numerical Investigation of the Effect of the Number of Blades and the Twist Ratio of the Twisted tape on the Performance of the Double-Pipe Heat Exchanger | ||
| نویسندگان [English] | ||
| Mohammad Reza Tavakoli؛ Saeed Mohebi | ||
| Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, Iran | ||
| چکیده [English] | ||
| In this paper, the effect of a fixed twisted-tape placed in the inner tube of a double-pipe heat exchanger is investigated using numerical simulation. A twisted-tape with three and four blades with different twist ratios is placed in the inner tube of the heat exchanger, and the Nusselt number, friction coefficient, and overall performance coefficient of the heat exchanger are studied. The flow velocity in the outer tube is considered constant, but the Reynolds number of the flow at the inlet of the inner tube is changed in the range of 5000 to 12000. The results showed that in all cases, placing a twisted-tape inside increases the Nusselt number and friction coefficient. The highest increase of these two parameters is 244 and 490 percent, respectively. By increasing the Reynolds number, the friction coefficient and the overall performance coefficient decreased, while the Nusselt number increased. This increase reaches about 80% in the case that has a twisted-tape with a twist ratio of 4. Also, reducing the twist ratio increases the turbulence of the flow and thus increases the Nusselt number, pressure drop, friction coefficient, and the overall performance coefficient. The maximum increase in the friction coefficient due to the reduction of the twist ratio from 8 to 4 was equal to 43%, occurred in the Reynolds number of 5000 and the three-bladed twisted-tape. Increasing the number of blades of the twisted tape has a direct effect on the pressure drop and friction coefficient and causes a decrease in the overall performance coefficient. | ||
| کلیدواژه‌ها [English] | ||
| Heat exchanger, Nusselt number, Friction coefficient, Overall performance coefficient, Twisted-tape | ||
| مراجع | ||
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