دراسة العددية لأنتقال الحرارة بالحمل في قناة مستطيلة مملوءة بالرغوة المعدنية متدرجة الثقوب في البوصة الواحدة
محتوى المقالة الرئيسي
الملخص
أستخدم في الدراسة الحالية ANSYS FLUENT 20. لاجراء تحليل عددي لخصائص انتقال الحرارة و تدفق الهواء في قناة مستطيلة. القناة تكون مملوءة بالكامل بالرغوة النحاسية ذا مسامية عالية. حيث تحققت الدراسة من تأثير عدد رينولد و الفيض الحراري علئ عدد نسلت و معامل الأحتكاك و عامل الاداء. استعمل نموذج ثنائي البعد بأستخدام معادلة دارسي فورشهايمر الموسعة ببريكمان لمعادلات الزخم و نموذج عدم التوازن الحراري لمعادلة الطاقة. تحققت الدراسة من أربع حالات لترتيب مختلف من كثافة مسام. علئ وجه التحديد، حالة واحدة ذات كثافة مسام 10 ثقب في البوصة و الحالة الاخرئ ذات كثافة مسام 40 ثقب في البوصة. كذلك أستخدم حالتين اخريتين ذا هيكل متدرج الثقوب من (40-20-10) و (10-20-40). و تضمنت متغيرات العمل ان عدد رينولد للهواء من 200 الئ 2100 و الفيض الحراري المسلط من 450 الئ 6000 واط/م2 . وضحت النتائج الئ ان استخدام الرغوة المعدنية ذات كثافة مسام منخفضة أدت الئ انخفاض في كل من عدد نسلت و هبوط الضغط. و اظهرت النتائج للحالتين المتدرجتين ان عدد نسلت و معامل الاحتكاك يقع ضمن نطاق الحالات ذات كثافة مسام ثابتة. و مع ذلك، أظهر الهيكل او التكوين (10-20-40) ثقب في البوصة الواحدة اعلئ معامل انتقال حراره من (40-20-10) ثقب في البوصة الواحدة مع نفس هبوط الضغط.
تفاصيل المقالة
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كيفية الاقتباس
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