بررسی تأثیر جهت حرکت دیواره بر انتقال حرارت جابه‌جایی ترکیبی درون محفظه متخلخل با جذب/تولید حرارت و میدان مغناطیسی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی مکانیک، دانشگاه یزد

2 دانشکده مهندسی مکانیک دانشگاه علم و صنعت ایران

3 دانشکده مهندسی مکانیک دانشگاه یزد

چکیده

در مطالعه حاضر، برای اولین بار، اثر جهت حرکت دیواره­های محفظه ربع دایره­ای شکل متخلخل بر انتقال حرارت جابجایی ترکیبی با وجود جذب/تولید حرارت یکنواخت به روش شبکه بولتزمن بررسی شده است. میدان مغناطیسی به دو صورت یکنواخت و پریودیک بر محفظه اعمال می­گردد. جابجایی ترکیبی بر اثر حرکت دیواره­ها در جهات مختلف به وجود می­آید. نتایج نشان می­دهد که افزایش عدد ریچاردسون، عدد هارتمن، ضریب جذب/تولید حرارت و کاهش ضریب تخلخل سبب کاهش عدد ناسلت متوسط می­شود. با ثابت ماندن تمامی پارامترها، بیشترین مقدار عدد ناسلت متوسط مربوط به زاویه اعمال سرعت ۹۰ درجه است که در این حالت عدد ناسلت متوسط در حدود 2۵ درصد بیشتر است. همچنین افزایش عدد ریچاردسون سبب کاهش تأثیر اعمال میدان مغناطیسی می­شود. پریودیک اعمال کردن میدان مغناطیسی در مقایسه با اعمال یکنواخت، حدود ۳۰ درصد انتقال حرارت بیشتری را منجر می­شود. افزایش ضریب تخلخل، اثر عدد هارتمن و زاویه اعمال سرعت را افزایش می­دهد. افزایش هم‌زمان ضریب جذب/تولید حرارت و عدد هارتمن، کاهش بیشتر عدد ناسلت متوسط را در پی دارد.

کلیدواژه‌ها

عنوان مقاله [English]

Investigation the Effect of Direction of Wall Movement on Mixed Convection in Porous Enclosure with Heat Absorption/Generation and Magnetic Field

نویسندگان [English]

  • Mohammad nemati 1
  • hajar mohamadzade 2
  • mohammad sefid 3
1 Department of Mechanical Engineering, Yazd University, Yazd, Iran
2 Department of Mechanical Engineering, University of Science and Technology,Iran
3 Department of Mechanical Engineering, Yazd University, Yazd, Iran
چکیده [English]

In this paper for the first time, the effect of direction of wall movement on mixed convection in circle quarter porous enclosure with heat absorption/generation is investigated by LBM. The magnetic field is applied to the enclosure in uniform and periodic forms. Mixed convection is caused by the movement of walls at different angles. The results show that increasing the Richardson number, Hartmann number, heat absorption/generation coefficient and decrease the porosity coefficient reduce the average Nusselt number. With fixed all parameters the maximum value of the average Nusselt number is related to the 90 ° velocity angle, in which case the average Nusselt number is about 25% higher.  Increasing the Richardson number reduces the effect of the magnetic field. Periodic applied of a magnetic field results in about 30% more than uniform applied. Increasing the porosity coefficient also increases the effect of the Hartmann number and the angle of wall movement. It is observed that the simultaneous increase of the heat absorption/generation coefficient and the Hartmann number lead to a further decrease of the average Nusselt number.

کلیدواژه‌ها [English]

  • : Uniform Heat Absorption/Generation
  • Mixed Convection
  • Lattice Boltzmann Method
  • Direction of Wall Movement
  • Porous Medium
  • Periodic Magnetic Field

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سابقه مقاله

  • تاریخ دریافت: 29 مرداد 1399
  • تاریخ بازنگری: 19 آبان 1399
  • تاریخ پذیرش: 04 بهمن 1399
  • تاریخ انتشار: 01 تیر 1399

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