تحلیل عملکرد حرارتی و انتروپی تولیدی جریان نانوسیال در یک چاه‌گرمایی ذوزنقه‌ای با آرایش‌های مختلف

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی مکانیک، دانشگاه کاشان، کاشان، ایران

چکیده

در این پژوهش مشخصه‌های انتقال‌حرارت و تولید انتروپی جریان آرام نانوسیال آب- آلومینا در یک چاه‌گرمایی میکروکانالی ذوزنقه‌ای به صورت عددی و سه‌بعدی برای شار حرارتی ثابت kW/m2200 ورودی به کف چاه‌گرمایی و با لحاظ نمودن هدایت در قسمت‌های جامد مطالعه شده‌است. معادلات حاکم بر جریان به روش حجم محدود بر مبنای المان محدود حل شده‌است. هدف اصلی این تحقیق بررسی اثر چهار آرایش مختلف ورود/خروج افقی جریان بر روی شاخص‌های حرارتی و تولید انتروپی، با لحاظ اثر حرکت براونی نانوذرات و تغییر خواص نانوسیال با دما، بوده است. نتایج نشان می‌دهد افزایش افت فشار برای یک کسر حجمی ثابت موجب افزایش عدد ناسلت (بین1/78% تا 1/88%)، کاهش مقاومت حرارتی(بین35/94% تا 40/41%)، کاهش نسبت بیشینه اختلاف دمای کف چاه‌گرمایی به شار حرارتی(بین33/90% تا 41/60%) و کاهش انتروپی تولیدی کل(بین24/34% تا 27/15%) می‌شود. همچنین برای همه آرایش‌ها در یک افت فشار ثابت افزایش کسر‌حجمی باعث افزایش عدد ناسلت(بین11/88% تا12/06%) و انتروپی تولیدی کل(بین1/77% تا 32/37%) می‌شود، ولی تأثیر قابل ملاحظه‌ای بر مقاومت حرارتی و نسبت بیشینه اختلاف دمای کف چاه‌گرمایی به شار حرارتی ندارد به طوری‌که با افزایش کسر حجمی از صفر تا 4% تغییرات مقاومت حرارتی و نسبت بیشینه اختلاف دمای کف چاه‌گرمایی به شار حرارتی به ترتیب کمتر

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Thermal performance and entropy generation analyses of nanofluid flow in a trapezoidal heat sink with different arrangements

نویسندگان [English]

  • Hossein Khorasanizadeh
  • Mojtaba Sepehrnia
University of Kashan
چکیده [English]

In this three dimensional study heat transfer characteristics and entropy generation of Alumina-water nanofluid laminar flow in a trapezoidal microchannel heat sink have been investigated numerically for a constant heat flux of 200 kW/m2 entering from the substrate and by considering conduction in solid parts. The main scope of this study has been investigating the effects of four horizontal inlet/outlets configurations, from different parts of the inlet and outlet chambers, on heat transfer characteristics and entropy generation, whereas the effects of the Brownian motion of nanoparticles and temperature-dependent properties of the nanofluid are considered. The results show that for a constant pressure drop increasing the nanoparticles volume fraction increases the Nusselt number and total entropy generation, while does not have impressive effect on thermal resistance and tetta (temperture uniformity of substrate). Also for a constant volume fraction increasing pressure drop increases Nusselt number, but decreases thermal resistance, tetta and total entropy generation. According to thermal idicators the A-type arrangment performs better. However, in terms of total entropy generation the B-type arrangement has a slightly better performance. In overall due to importance of tetta the A-type arrangement is the optimum arrangement.

کلیدواژه‌ها [English]

  • Thermal performance
  • Entropy generation
  • Microchannel
  • Different arrangements
  • Nanofluid

مراجع

[1]D. B. Tuckerman, R. Pease, High-performance heat sinking for VLSI, IEEE Electron device letters, Vol. 2, No. 5, pp. 126-129, 1981.
[2]C. B. Sobhan, S. V. Garimella, A comparative analysis of studies on heat transfer and fluid flow in microchannels, Microscale Thermophysical Engineering, Vol. 5, No. 4, pp. 293-311, 2001.
[3]R. Chein, G. Huang, Analysis of microchannel heat sink performance using nanofluids, Applied Thermal Engineering, Vol. 25, No. 17, pp. 3104-3114, 2005.
[4]R. Chein, J. Chen, Numerical study of the inlet/outlet arrangement effect on microchannel heat sink performance, International Journal of Thermal Sciences, Vol. 48, No. 8, pp. 1627-1638, 2009.
[5]T.-C. Hung, W.-M. Yan, Effects of tapered-channel design on thermal performance of microchannel heat sink, International Communications in Heat and Mass Transfer, Vol. 39, No. 9, pp. 1342-1347, 2012.
[6]H. R. Seyf, B. Nikaaein, Analysis of Brownian motion and particle size effects on the thermal behavior and cooling performance of microchannel heat sinks, International Journal of Thermal Sciences, Vol. 58, pp. 36-44, 2012.
[7]V. L. Vinodhan, K. Rajan, Computational analysis of new microchannel heat sink configurations, Energy Conversion and Management, Vol. 86, pp. 595-604, 2014.
[8]B. Fani, M. Kalteh, A. Abbassi, Investigating the effect of Brownian motion and viscous dissipation on the nanofluid heat transfer in a trapezoidal microchannel heat sink, Advanced Powder Technology, Vol. 26, No. 1, pp. 83-90, 2015.
[9]V. Duryodhan, A. Singh, S. Singh, A. Agrawal, Convective heat transfer in diverging and converging microchannels, International Journal of Heat and Mass Transfer, Vol. 80, pp. 424-438, 2015.
[10]M. Dehghan, M. Daneshipour, M. S. Valipour, R. Rafee, S. Saedodin, Enhancing heat transfer in microchannel heat sinks using converging flow passages, Energy Conversion and Management, Vol. 92, pp. 244-250, 2015.
[11]M. Kalteh, A. Alipour, Investigating the effect of velocity slip and temperature jump on heat transfer of nanofluid in a microchannel under constant heat flux with lattice Boltzmann method, Amirkabir Journal of Mechanical Engineering, doi: 10.22060/mej.2016.857, 2016. (in Persian)
[12]H. Khorasanizadeh, M. Sepehrnia, Effects of different inlet/outlet arrangements on performance of a trapezoidal porous microchannel heat sink, Modares Mechanical Engineering, Vol. 16, No. 8, pp. 269-280, 2016. (in Persian)
[13]H. Khorasanizadeh, M. Sepehrnia, R. Sadeghi, Three dimensional investigations of inlet/outlet arrangements and nanofluid utilization effects on a triangular microchannel heat sink performance, Modares Mechanical Engineering, Vol. 16, No. 12, pp. 27-38, 2016. (in Persian)
[14]H. Khorasanizadeh, M. Sepehrnia, R. Sadeghi, Investigation of nanofluid flow field and conjugate heat transfer in a MCHS with four different, Amirkabir Journal of Mechanical Engineering, doi: 10.22060/mej.2017.12473.5347. (in Persian)
[15]S. E. Ghasemi, A. Ranjbar, M. Hosseini, Thermal and hydrodynamic characteristics of water-based suspensions of Al2O3 nanoparticles in a novel minichannel heat sink, Journal of Molecular Liquids, Vol. 230, pp. 550-556, 2017.
[16]A. Bejan, Fundamentals of exergy analysis, entropy generation minimization, and the generation of flow architecture, International journal of energy research, Vol. 26, No. 7, pp. 0-43, 2002.
[17]A. Bejan, A study of entropy generation in fundamental convective heat transfer, J. Heat Transfer, Vol. 101, No. 4, pp. 718-725, 1979.
[18]H. Abbassi, Entropy generation analysis in a uniformly heated microchannel heat sink, Energy, Vol. 32, No. 10, pp. 1932-1947, 2007.
[19]P. K. Singh, K. Anoop, T. Sundararajan, S. K. Das, Entropy generation due to flow and heat transfer in nanofluids, International Journal of Heat and Mass Transfer, Vol. 53, No. 21, pp. 4757-4767, 2010.
[20]J. Guo, M. Xu, J. Cai, X. Huai, Viscous dissipation effect on entropy generation in curved square microchannels, Energy, Vol. 36, No. 8, pp. 5416-5423, 2011.
[21]W. H. Mah, Y. M. Hung, N. Guo, Entropy generation of viscous dissipative nanofluid flow in microchannels, International Journal of Heat and Mass Transfer, Vol. 55, No. 15, pp. 4169-4182, 2012.
[22]M. Sohel, R. Saidur, N. Hassan, M. Elias, S. Khaleduzzaman, I. Mahbubul, Analysis of entropy generation using nanofluid flow through the circular microchannel and minichannel heat sink, International Communications in Heat and Mass Transfer, Vol. 46, pp. 85-91, 2013.
[23]N. Pourmahmoud, H. Soltanipour, I. Mirzaee, The effects of longitudinal ribs on entropy generation for laminar forced convection in a microchannel, Thermal Science, No. 00, pp. 110-110, 2014.
[24]K. Leong, H. C. Ong, Entropy generation analysis of nanofluids flow in various shapes of cross section ducts, International Communications in Heat and Mass Transfer, Vol. 57, pp. 72-78, 2014.
[25]Y. Xuan, W. Roetzel, Conceptions for heat transfer correlation of nanofluids, International Journal of heat and Mass transfer, Vol. 43, No. 19, pp. 3701-3707, 2000.
[26]R. Hamilton, O. Crosser, Thermal conductivity of heterogeneous two-component systems, Industrial & Engineering chemistry fundamentals, Vol. 1, No. 3, pp. 187-191, 1962.
[27]J. Li, Computational Analysis of Nanofluid Flow in Microchannels with Applications to Micro-heat Sinks and Bio-MEMS: ProQuest, 2008.
[28]R. J. Phillips, Microchannel Reat Sinks, Lincoln Laboratory Journal, Vol. 1, No. 1, 1988.
نشریه مهندسی مکانیک امیرکبیر
دوره 51، شماره 4
مهر و آبان 1398
صفحه 101-110

فایل ها

هم رسانی

ارجاع به این مقاله

آمار