حل تجربی و شبیه‌سازی عددی جریان و انتقال حرارت در رادیاتور اتومبیل در جریان اجباری و طبیعی

خسروی فارسانی, ایوب; اسدی بروجنی, بهروز; شبانی, فرشاد

doi:10.48301/kssa.2022.336734.2061

حل تجربی و شبیه‌سازی عددی جریان و انتقال حرارت در رادیاتور اتومبیل در جریان اجباری و طبیعی

نوع مقاله : مقاله پژوهشی (کاربردی)

نویسندگان

¹ عضو هیئت علمی، گروه مهندسی مکانیک، دانشگاه فنی و حرفه‌ای، تهران، ایران.

² دانش‌آموخته کارشناسی ارشد، گروه مهندسی مکانیک، دانشگاه فنی و حرفه‌ای، تهران، ایران.

10.48301/kssa.2022.336734.2061

چکیده

در مطالعه پیش رو به بررسی تجربی و عددی انتقال حرارت در رادیاتور اتومبیل پراید پرداخته‌ شده است. در حل تجربی یک رادیاتور اتومبیل از جنس آلومینیوم که در آن سیال خنک‌کننده جریان دارد تحت شرایط مرزی واقعی در هنگام خاموش شدن موتور بررسی شد. دمای سیال ورودی و خروجی رادیاتور توسط دو سنسور از نوع ضریب دمای منفی NTC اندازه‌گیری شد. در تحلیل عددی معادلات پیوستگی، مومنتوم و انرژی با روش حجم کنترل برای حل عددی جریان توسط نرم‌افزار انسیس فلوئنت به‌کار گرفته‌ شده‌اند. در این مطالعه تأثیرات جریانهای ثانویه و نیروی گریز از مرکز و شناوری بر میدان جریان در نظر گرفته ‌شده است و همچنین به بررسی تأثیر جریان طبیعی و جریان اجباری در انتقال حرارت رادیاتور پرداخته ‌شده است. نتایج در قالب کانتورها و نمودارهای شار حرارتی و دما ارائه گردیده است. آزمایش‌های انجام‌شده تأثیر جریان اجباری را در سیستم خنک‌کننده هنگام خاموش شدن موتور نشان می‌دهد. نتایج نشان می‌دهد اختلاف دمای ورودی و خروجی در موتور در شرایط گردش آزاد در حل تجربی ۱۳ درجه سانتی‌گراد و در حل عددی ۱/۱۲ درجه سانتی‌گراد است و در گردش اجباری سیال اختلاف دمای ورودی و خروجی در موتور در حل تجربی ۵/۱ درجه سانتی‌گراد و در حل عددی ۸/۱ درجه سانتی‌گراد است. گردش طبیعی سیال در سیستم خنک‌کننده باعث کاهش دمای ناحیه‌ای سیستم می‌شود و به علت ماندگاری زیاد در رادیاتور، اختلاف دمای ورودی و خروجی رادیاتور زیاد است.

کلیدواژه‌ها

20.1001.1.23829796.1401.19.3.4.4

موضوعات

تبدیل انرژی

عنوان مقاله [English]

Experimental Solution and Numerical Simulation of Flow and Heat Transfer in Car Radiators in Forced and Natural Flows

نویسندگان [English]

Ayoub Khosravi Farsani ¹
Behrooz Asadi Boroojeni ¹
Farshad Shabani ²

¹ Instructor, Department of Mechanical Engineering, Technical and Vocational University (TVU),Tehran, Iran.

² Master of Mechanical Engineering, Department of Mechanical Engineering. Technical and Vocational University (TVU), Tehran. Iran.

چکیده [English]

In the present study, experimental and numerical studies of heat transfer in Pride car radiators were carried out. In the experimental solution, an aluminum car radiator in which the cooling fluid flows was examined under real boundary conditions. Radiator inlet and outlet temperatures were measured by two NTC sensors. In the numerical analysis, the equations of continuity, momentum and energy were used by the volume control method to numerically solve the flow with Ansys Fluent software. In this study, the effects of secondary currents and centrifugal force and buoyancy on the flow field were taken into consideration and the effect of natural and forced currents on radiator heat transfer was also investigated. The results were presented in the form of contours and diagrams of heat flux and temperature. Experiments showed the effect of forced current on the cooling system when the engine is turned off. The difference between the inlet and outlet temperatures of the motor under free circulation conditions was greater than that of the forced circulation of fluid. The results also demonstrated that the difference between the inlet and outlet temperatures of the engine under free convection in the experimental solution was 13 ° C and in the numerical solution 12.1 ° C while in the forced convection of the fluid, the difference between the inlet and outlet temperatures in the experimental solution was 1.5 ° C and in the numerical solution 1.8 ° C. Due to the long shelf life of the radiator, the differences between the inlet and outlet temperatures of the radiator was large.

کلیدواژه‌ها [English]

Heat transfer
Experimental solution
Numerical simulation
Automotive radiator
Forced flow and natural flow

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