Hossaini, M., Khaloei, M., Zandi Baghche Maryam, A. (2016). Time Dependent Analysis of Micro-tubes Conveying Nanofluids Under Time-Varying Heat Flux. Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 9(4), 661-672.
Mohammad Hossaini; Meisam Khaloei; Abbas Zandi Baghche Maryam. "Time Dependent Analysis of Micro-tubes Conveying Nanofluids Under Time-Varying Heat Flux". Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 9, 4, 2016, 661-672.
Hossaini, M., Khaloei, M., Zandi Baghche Maryam, A. (2016). 'Time Dependent Analysis of Micro-tubes Conveying Nanofluids Under Time-Varying Heat Flux', Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 9(4), pp. 661-672.
Hossaini, M., Khaloei, M., Zandi Baghche Maryam, A. Time Dependent Analysis of Micro-tubes Conveying Nanofluids Under Time-Varying Heat Flux. Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 2016; 9(4): 661-672.
Time Dependent Analysis of Micro-tubes Conveying Nanofluids Under Time-Varying Heat Flux
1Assistant Professor, Department of Mechanical Engineering, Sirjan University of Technology, Sirjan, Iran
2M.Sc., Department of Mechanical Engineering, Sirjan Branch, Islamic Azad University, Sirjan, Iran
3M.Sc., Department of Mechanical Engineering, Sirjan University of Technology, Sirjan, Iran
Abstract
In this paper the numerical analysis of flow and time dependent heat transfer of micro-tube conveying nanofluid in laminar flow is investigated. In this study, convection heat transfer of nanofluid and base fluid and transient analysis for time-varying heat flux for time step of 0.0001 second are elucidated. It is observed that the pumping power of nanofluid flowing and the maximum temperature of micro-tube wall, respectively, is increased and decreased with increases in the volume fraction of nanoparticle. The maximum temperature of base fluid (water) is 305.6K and the maximum temperature is 304.2K for alumina oxide nanoparticle AF with volume fraction 3%. In addition, the results show that using nanofluid has the advantage of heat transfer despite periodic heat flux. However, the results show that these parameters are vital in investigation of the heat transfer of system. Also, It is obvious that the maximum temperature of micro-tube wall decreases with increase in the Reynolds number. For example, for Reynolds numbers 180, 360 and 720, the maximum temperatures occur at 307.8K, 304.6K and 302.8K, respectively. In addition, it is indicated that the variation of temperature decreases when the volume fraction of nanoparticles increases. Also the results of numerical modeling are compared with those available in literature and good agreement is observed.
تحلیل انتقال حرارت وابسته به زمان میکرولوله محتوی نانوسیال تحت شار حرارتی متغیر با زمان
Authors [Persian]
محمد حسینی, میثم خالویی, عباس زندی باغچه مریم
Abstract [Persian]
در این مقاله تحلیل عددی جریان و انتقال حرارت وابسته به زمان میکرولوله محتوی نانوسیال در جریان آرام بررسی شده است. در این بررسی، انتقال حرارت جابه‌جایی نانوسیال و سیال پایه و تحلیل گذرا برای شار حرارتی متغیر با زمان، به‌ازای گام زمانی 4-10 ثانیه بررسی شده است. مشاهده شد که با افزایش کسر حجمی نانوذره، قدرت پمپاژ نانوسیال و دمای حداکثر دیواره میکرولوله به‌ترتیب افزایش و کاهش پیدا می‌کند. حداکثر دما سیال پایه (آب) 6/305 کلوین و برای نانوذره اکسید آلومینیوم AF با کسر حجمی سه درصد، دمای حداکثر 2/304 کلوین می‌باشد. علاوه‌براین نتایج نشان داد که استفاده از نانوسیال با وجود شار حرارتی پریودیک دارای مزیت انتقال حرارتی است. از سویی دیگر نتایج نشان می‌دهد که پارامترهای ذکر شده، تأثیر قابل توجهی در انتقال حرارت سیستم دارند. همچنین مشاهده گردید که با افزایش عدد رینولدز دمای حداکثر دیواره میکرولوله کاهش پیدا می‌کند. به‌عنوان مثال، برای عدد رینولدز 180، 360 و 720 دمای حداکثر به-ترتیب در 307.8 کلوین،304 کلوین و 302.8 کلوین رخ می‌دهد. علاوه براین افزایش کسر حجمی نانوذره موجب کاهش در تغییرات دما می‌شود. همچنین نتایج حاصل از مدل-سازی عددی با نتایج روابط تئوریک موجود که در تطابق خوبی با نتایج تجربی بوده‌اند، مقایسه شده است.
Keywords [Persian]
میکرولوله، نانوسیال، انتقال حرارت، شار حرارتی متغیر با زمان
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