بررسی عددی بهبود نرخ انتقال حرارت در رادیاتور خودرو با استفاده از لوله‌های ریز مجرا و چیدمان مناسب لوله‌ها

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار،دانشگاه امام علی (ع)، تهران، ایران

2 کارشناسی ارشد، دانشگاه صنعتی مالک اشتر، تهران، ایران

3 دکترای تخصصی ، دانشگاه صنعتی مالک اشتر، تهران، ایران

چکیده

استفاده از مخلوط اتیلن‌گلیکول و آب به‌عنوان سیال عامل دارای ضد یخ در رادیاتور خودرو، سبب کاهش نرخ انتقال حرارت و افزایش افت فشار می‌شود. بر اساس نتایج به‌دست‌آمده، مخلوط 70%-30% حجمی آب و اتیلن‌گلیکول 20%-12% انتقال حرارت کمتر و 20%-5% افت فشار بیشتری نسبت به آب خالص دارد. به‌منظور افزایش نرخ انتقال حرارت در رادیاتور، می‌توان از تغییرات هندسی که بر مولفه‌های انتقال حرارت شامل ضریب انتقال حرارت و سطح تبادل گرما تأثیرگذار هستند استفاده کرد. پژوهش حاضر به روش تحلیل عددی و با استفاده از روش‌های دینامیک سیالات محاسباتی به بررسی تأثیر استفاده از ریز مجرا به‌جای لوله‌های ساده، استفاده از لوله با سطح مقطع (-) و (+) شکل و تغییر چیدمان لوله‌های رادیاتور از عمودی به افقی پرداخته است. نتایج نشان می‌دهد استفاده از لوله‌های دارای ریز مجرا می‌تواند 67%-15% نرخ انتقال حرارت در رادیاتور را افزایش دهد همچنین در این حالت ضریب اصطکاک نیز 52%-6% افزایش‌یافته که باعث افت فشار بیشتر می‌شود. همچنین استفاده از چیدمان افقی لوله‌ها در رادیاتور به‌جای چیدمان عمودی، دارای 91%-10% نرخ انتقال حرارت بیشتر می‌باشد.

کلیدواژه‌ها

عنوان مقاله [English]

Numerical Investigation of Heat Transfer Enhancement in an Automotive Radiator Utilizing Mini-Channel Tubes and Tubes Configuration

نویسندگان [English]

  • amirhamzeh farajollahi 1
  • mohammadmehdi yahya abadi 2
  • mehdi pourseifi 3
1 Assistant Professor, Imam Ali University, Tehran, Iran
2 Masters ، Malek Ashtar University of Technology, Tehran, Iran
3 PhD , Malek Ashtar University of Technology, Tehran, Iran
چکیده [English]

Utilizing EG/Water solution as working fluid in an automotive radiator cooling system could cause a significant decrement in heat transfer rate and increases fluid pressure drop. According to the results of this numerical research, a 70%-30% EG/Water solution has about 12%-20% less heat transfer rate and 5%-20% more pressure drop compared to pure water. Geometrical changes affecting the heat transfer parameters could be used to enhance the heat transfer performance of the radiator. This study aims to numerically investigate the effect of employing the mini-channel tubes and (-) or (+) shaped cross-section tubes rather than simple tubes on heat exchanger performance. Comparing the vertical and the horizontal configuration of pipes on heat transfer function is also studied. Results show that utilizing the mini-channel tubes can raise the heat transfer rate by about 15%-67%, while the friction factor is also increased by about 6%-52%. A considerable increment of nearly 10%-91% is also reported as an impact of employing horizontally arranged tubes compared to vertical tube configuration.
.

کلیدواژه‌ها [English]

  • Automotive Radiator
  • Heat Transfer Enhancement
  • Heat Transfer in Mini Tubes
  • Radiator Tube Arrangement
  • EG/Water Solution

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مکانیک سیالات و آیرودینامیک
دوره 11، شماره 2 - شماره پیاپی 30
پاییز و زمستان 1401
اسفند 1401
صفحه 37-49

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سابقه مقاله

  • تاریخ دریافت: 28 مرداد 1401
  • تاریخ بازنگری: 08 آبان 1401
  • تاریخ پذیرش: 17 آبان 1401
  • تاریخ انتشار: 11 اسفند 1401

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