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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Nanofluid,Volume fraction,Temperature,Thermal conductivity,Carbon nano tubes
- چکیده:
- چکیده انگلیسی: This work presents a model for calculating the effective thermal conductivity of nanofluids. The proposed model includes the effects of nanoparticles and thermal conductivity base fluid.We will focus on experimental of the volume concentration parameter and temperature on thermal conductivity, nano-fluid combination and Multi-Walled Carbon nanotubes-Oxide / Copper-paid deionized Water. This water-based nanofluids, For two-step volume fractions of the 0.1, 0.2, 0.6 Percentage produced And then, Effective thermal conductivity is measured precisely. In order to measure the thermal conductivity of nanofluids. To measure the thermal conductivity coefficient in THW method, KD2-pro and KS1 probe was used, also with the fluid significantly enhancement shows in thermal conductivity coefficient. Also with the fluid significantly enhancement shows in thermal conductivity coefficient. In lower volume fractions we observed significantly increase in thermal conductivity and receive high degree thermal. Due to the lack of similar studies Due to the lack of similar studies to comprehensively and inefficient of classical thermal conductivity, In order to estimate the thermal conductivity of nanofluids An empirical model that estimates the thermal conductivity of nanofluids model with deviation margin is very low
- انتشار مقاله: 08-09-1394
- نویسندگان: Masoud Zadkhast,Davood Toghraee,Arash Karimipour
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: میکروکانال دندانهدار,نانوسیال,انتقال حرارت,ضریب اصطکاک
- چکیده:
- چکیده انگلیسی: در تحقیق حاضر در مورد اثرات ارتفاع دندانه در میکروکانال دندانهدار دو بعدی، بر روی پارامترهای انتقال حرارت و دینامیک سیالات محاسباتی جریان آرام نانوسیال آب-اکسید آلومینیم است. بررسیهای این تحقیق به صورت عددی با نرم افزار تجاری فلوئنت3/6 برای اعداد رینولدز10 و 100، برای چهار حالت مختلف ارتفاع دندانه انجام شده است. افزایش ارتفاع دندانههای داخلی یا مغشوشگرهای جریان، عملکرد انتقال حرارت جابجایی در میکروکانال را به میزان قابل توجهی افزایش میدهد. مشاهده میشود که نرخ انتقال حرارت در میکروکانال با افزایش ارتفاع دندانه و افزایش کسر حجمی نانو ذرات، بهبود مییابد. اما افزایش ارتفاع دندانه، باعث افزایش ضریب اصطکاک بزرگتر در مقایسه با میکروکانال با ارتفاع دندانه ثابت است. در این تحقیق برای همه حالات مختلف ارتفاع دندانه، تأثیر ارتفاع دندانه بر روی پارامترهای جریان سیال بررسی شده است. نتایج در قالب پروفیلهای سرعت و دما، عدد ناسلت و کانتورهای تابع جریان و خطوط هم دما ترسیم می-شوند......
- انتشار مقاله: 08-09-1394
- نویسندگان: Davood Toghraee,Arash Karimipour,OmidAli Akbari,Majid Zaringhalam,Habibolah Alipour
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Laminar flow,Temperature Jump,Slip Flow,microtube,Water-Cu nanofluid
- چکیده:
- چکیده انگلیسی:
Given the need to increase the efficiency of heat transfer in thermal systems, especially systems using nanofluids in microscale and nanoscale heat transfer equipment ideas to improve their performance is very good.In present study, the flow and heat transfer of Water-Cu nanofluid in micro-tube with slip regime with constant wall heat flux numerically simulated with low Reynolds numbers. Slip velocity and temperature jump boundary conditions are also considered along the microtube walls, for first time. The results are presented as the profiles of temperature and velocity. Nusselt number and pressure drop coefficient calculated in interance and full developed region. The effect of slip and using nano particle considerd.
It is observed that Nusselt number increases with slip velocity coefficient and pressure drop coefficient decreases; att intrance region the Raynolds of flow has effect on Nusselt and pressure drop coefficient,too.
Likewise observed nano particle adding to water has low effect to increases Nusselt number and pressure drop coefficientt.- انتشار مقاله: 15-08-1394
- نویسندگان: Saeed Javid,Arash Karimipour
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: heat exchanger,Nanofluid,increase heat transfer
- چکیده:
- چکیده انگلیسی: Heat Transfer has special importance in engineering applications. So, researchers have suggested different new idea to increase heat transfer and using nanofluid is one of these methods In recent years, new methods have been used. One of these methods is the use of nanofluids, ., because nanofluids have higher heat transfer potential than base conventional fluids. In this investigation effect of suspended CuO nanoparticles with volume fraction of 0.005 into base water fluid is considered under turbulent flow regime inside double tube counter heat exchanger. It was observed that suspending pre-mentioned amount of nanoparticle augmentate heat transfer capability of conventional water fluid. On the other side, it leads to increase pressure drop and friction factor of water base fluid. Finally they conclude that positive effect of heat transfer augmentation is so stronger than negative effect of increasing pressure drop and friction factor that motivate to utilize this nanofluid in practical applications.
- انتشار مقاله: 14-08-1394
- نویسندگان: Arash KarimiPour,Davood Toghraie,Omid Ali Akbari,Majid Zarringhalam,Gholamreza Ahmadi Sheikh Shabani
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Nanofluid,LBM,Inclined enclosure
- چکیده:
- چکیده انگلیسی: Mixed convection of Cu-Water nanofluid is studied numerically in a shallow inclined enclosure by applying lattice Boltzmann method. The D2Q9 lattice and internal energy distribution function based on the BGK collision operator are used in order to develop the thermal flow field. The enclosure's hot lid has the constant velocity of U0 while its cold lower wall has no motion. Moreover, sidewalls are taken in to account as adiabatic ones. At 3 modes of convection heat transfer (free convection, force convection and mixed convection), the effects of volume fraction and inclination angle of enclosure are studied for different values of Reynolds number as equal to 10 and 100. Comparison of achieved results as like the streamlines, isotherms and profiles of velocity and temperature versus pervious available ones, implies the appropriate agreement. It is seen that more amount of volume fraction and enclosure inclination angle at the state of free convection would correspond to higher Nusselt number. The incomes of present work show the suitable performance of lattice Boltzmann method in order to simulate the nanofluid mixed convection in an inclined enclosure.
- انتشار مقاله: 08-08-1394
- نویسندگان: Arash Karimipour,Arash Karimipour,Arash Karimipour
- مشاهده