مقایسۀ مدل‎های تکفازی، مخلوط دوفازی و اولری-اولری در شبیه‎سازی برخورد جت نانوسیالات

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه آزاد مشهد

2 دانشگاه آزاد اسلامی، واحد مشهد، گروه مکانیک، مشهد، ایران

چکیده

این مقاله به بررسی تبادل حرارت در برخورد جت نانوسیالات می‎پردازد. هدف، مقایسۀ مدل‎های تکفازی و دوفازی در تحلیل جریان نانوسیالات و هم‎چنین مطالعۀ رفتار سیال پایه و نانوذرات به طور مجزا در مدل دوفازی اولری-اولری می‎باشد. برای این منظور، برخورد جت نانوسیال آب/Al2O3 در حالت‎های مختلف با مدل‎های تکفازی، مخلوط دوفازی و دوفازی اولری-اولری شبیه‎سازی شده و نتایج به‎دستآمده مورد تجزیه و تحلیل قرار می‎گیرد. برای حل معادلات حاکم در هر سه مدل از روش حجممحدود استفاده می‎شود. صحت شبیه‎سازی‎های انجام شده با مقایسۀ نتایج به‎دستآمده با نتایج موجود به اثبات می‎رسد. نتایج نشان می‎دهند که در کلیۀ رویکردها، افزایش عدد رینولدز و بالارفتن کسر حجمی نانوذرات، بهبود تبادل حرارت را در پی دارد. در محاسبات انجام شده، مدلهای دوفازی انتقال حرارت بیشتری را نسبت به مدل تکفازی پیش‎بینی می‎کنند. مقایسۀ دقیق رویکردهای دوفازی نیز بیانگر انتقال حرارت بیشتر مدل اولری-اولری نسبت به مدل مخلوط می‎باشد. با این وجود، مشخص می‎شود که با افزایش عدد رینولدز و کاهش کسر حجمی نانوذرات، نتایج این دو روش به هم نزدیک‎تر می‏شوند. درنهایت، مدل اولری-اولری نشان می‎دهد که توزیع دما در سیال پایه و نانوذرات یکسان است اما توزیع سرعت‎ها با یکدیگر متفاوت می‎باشند.

کلیدواژه‌ها

عنوان مقاله [English]

Comparison between Single-Phase, Two-Phase Mixture and Eulerian-Eulerian Models for the Simulation of Jet Impingement of Nanofluids

نویسندگان [English]

  • edris torshizi 1
  • Iman Zahmatkesh 2
1 Islamic Azad University
2 Department of Mechanical Engineering, Mashhad Branch, Islamic Azad University, Mashhad, Iran
چکیده [English]

This paper deals with heat transfer in jet impingement of nanofluids. Attention is focused to compare single-phase and two-phase nanofluid models and to study separate behaviors of the base fluid and the nanoparticles through the Eulerian-Eulerian two-phase model. For this purpose, jet impingement of Al2O3/water nanofluid in different conditions is simulated adopting the single-phase, two-phase mixture and Eulerian-Eulerian models and the corresponding results are discussed. For the solution of the governing equations of the three models, the control-volume approach is used. The accuracy of the current simulations is demonstrated by comparing the obtained results with those of open literature. The results indicate that in all of the approaches, increase in the Reynolds number as well as nanoparticle fraction leads to heat transfer improvement. During the current computations, the two-phase models predict higher heat transfer as compared to the single-phase model. Closer scrutiny of the two-phase approaches indicates that heat transfer of the Eulerian-Eulerian model is higher than the mixture model. However, it is found that with increase in the Reynolds number and decrease in the nanoparticle fraction, results of the two approaches become closer. Finally, the Eulerian-Eulerian model demonstrates that temperature distribution in the base fluid and the nanoparticles are similar but the corresponding velocity distributions are distinct.

کلیدواژه‌ها [English]

  • Nanofluid, Jet impingement
  • Single-phase model
  • Two-phase mixture model
  • Eulerian-Eulerian model
  • Numerical simulation

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