![سامانه مدیریت نشریات علمی دانشگاه سمنان](./data/logo.png)
تعداد نشریات | 21 |
تعداد شمارهها | 573 |
تعداد مقالات | 8,591 |
تعداد مشاهده مقاله | 66,294,049 |
تعداد دریافت فایل اصل مقاله | 6,827,807 |
Converging Flow Passages, Nanofluids and Magnetic Field: Effects on the Thermal Response of Microchannel Heat Sinks | ||
Journal of Heat and Mass Transfer Research | ||
دوره 9، شماره 1 - شماره پیاپی 17، مرداد 2022، صفحه 77-84 اصل مقاله (684.64 K) | ||
نوع مقاله: Full Length Research Article | ||
شناسه دیجیتال (DOI): 10.22075/jhmtr.2022.22016.1320 | ||
نویسندگان | ||
Amir Fattahi1؛ Maziar Dehghan* 2؛ Mohammad Sadegh Valipour1 | ||
1Faculty of Mechanical Engineering, Semnan University, Semnan, Iran | ||
2Department of Energy, Material and Energy Research Center (MERC), Tehran, Iran | ||
تاریخ دریافت: 14 آذر 1399، تاریخ بازنگری: 13 تیر 1401، تاریخ پذیرش: 25 تیر 1401 | ||
چکیده | ||
To analyze the possibility of heat transfer enhancement of micro-scale heat exchangers, the transport phenomena of water (H2O) - Aluminum oxide (Al2O3) nanofluid in a three-dimensional microchannel with converging flow passages in the presence of a magnetic field are numerically investigated. All simulations are performed for the Harman number (Ha) of 0-20 and the volume fraction of ∅ = 0 and 0.02 in the laminar regime (Reynolds number, Re, < 100). The magnetic field is applied in the normal direction (with respect to the flow direction). The results show that the convection heat transfer coefficient, as well as the friction factor, increases with the increase of the Hartman number. The increase in the friction factor is noticeable up to being doubled while the increase of the convection heat transfer coefficient is up to 20 %. The uniform velocity arising from the magnetic field presence gives almost uniform temperature distributions in the fluid and solid parts of the micro-channel, which makes removing higher heat fluxes within the safe temperature limit possible. Although the heat transfer performance enhances with the increase of the magnetic field, the rate of heat transfer enhancement decreases with the increasing magnetic field. In other words, the magnetic field has a maximum effective value and there is no justification for a further increase according to the energy efficiency perspectives. It should be noted that the mentioned limits for magnetic field (here, presented with Ha) are very high and almost impossible to be applied at micro-scales. In addition, the effect of the magnetic field on the velocity profile decreases with the increase of the passage convergence. In other words, the flow convergence eliminates the need for a high magnetic field to have a uniform velocity profile and as well a uniform temperature distribution. | ||
کلیدواژهها | ||
Nanofluid؛ Converging flow passage؛ Convective heat transfer؛ Microchannel؛ Magnetic field | ||
عنوان مقاله [English] | ||
نانوسیالات، میدان مغناطیسی و گذرگاههای همگرای جریان: اثرات بر رفتار حرارتی ریزمبدلهای حرارتی | ||
چکیده [English] | ||
به منظور بررسی امکان بهبود عملکرد حرارتی ریزمبدلهای حرارتی، پدیدههای مرتبط با انتقال حرارت جابجایی آب (H2O) - نانوسیال اکسید آلومینیوم (Al2O3) در یک ریزمبدل حرارتی سهبعدی با گذرگاههای همگرای جریان در حضور میدان مغناطیسی به صورت عددی در محدوده عدد هارتمن (Ha) 0 الی 20 و کسر حجمی (∅) 0 و 0.02 در رژیم جریان آرام (عدد رینولدز، Re، کمتر از 100) شبیهسازی و محاسبه میشوند. نتایج نشان میدهد که ضریب انتقال حرارت جابجایی و همچنین ضریب اصطکاک با افزایش عدد هارتمن افزایش می یابد. با وجود افزایش ضریب اصطکاک به صورت محسوس تا دو برابر، میتوان به توزیع دمای یکنواخت در قسمت سیال و مهمتر از آن توزیع دمای تقریبا یکنواخت در بخش جامد ریزمبدل حرارتی دست یافت که حذف شارهای حرارتی بالاتر را در محدوده دمای ایمن کاری ممکن میسازد. همچنین دیده میشود میدان مغناطیسی دارای یک مقدار حداکثر مقدار مؤثر است و لذا هیچ توجیهی برای افزایش بیشتر از آن حد با توجه به دیدگاه بهرهوری انرژی وجود ندارد. البته این مقادیر حدی میدان مغناطیسی در عمل بسیار بالا و اعمال آن غیر امکانناپذیر میباشد. علاوه بر این، اثر میدان مغناطیسی بر یکنواخت کردن پروفیل سرعت با افزایش میزان همگرایی گذرگاهها کاهش مییابد. به عبارت دیگر استفاده از گذرگاههای همگرا نیاز به اعمال میدان مغناطیسی شدید در ریزابعاد برای دستیابی به میدان سرعت یکنواخت را از بین میبرد. | ||
کلیدواژهها [English] | ||
نانوسیال, گذرگاه همگرا, انتقال حرارت جابجایی, ریزمبدل حرارتی, میدان مغناطیسی | ||
مراجع | ||
[1] Modjinou, M., Ji, J., Yuan, W., Zhou, F., Holliday, S., Waqas, A. and Zhao, X., 2019. Performance comparison of encapsulated PCM PV/T, microchannel heat pipe PV/T and conventional PV/T systems. Energy, 166, pp.1249-1266.
[2] Deng, D., Xie, Y., Chen, L., Pi, G. and Huang, Y., 2019. Experimental investigation on thermal and combustion performance of a combustor with microchannel cooling. Energy, 181, pp.954-963.
[3] Osanloo, B., Mohammadi-Ahmar, A., Solati, A. and Baghani, M., 2016. Performance enhancement of the double-layered micro-channel heat sink by use of tapered channels. Applied Thermal Engineering, 102, pp.1345-1354.
[4] Bejan, A., 2013. Convection heat transfer. John wiley & sons.
[5] Li, J., Peterson, G.P. and Cheng, P., 2004. Three-dimensional analysis of heat transfer in a micro-heat sink with single phase flow. International Journal of Heat and Mass Transfer, 47(19-20), pp.4215-4231.
[6] Gamrat, G., Favre-Marinet, M. and Asendrych, D., 2005. Conduction and entrance effects on laminar liquid flow and heat transfer in rectangular microchannels. International Journal of Heat and Mass Transfer, 48(14), pp.2943-2954.
[7] Akar, S., Rashidi, S., Esfahani, J.A. and Karimi, N., 2019. Targeting a channel coating by using magnetic field and magnetic nanofluids. Journal of Thermal Analysis and Calorimetry, 137(2), pp.381-388.
[8] Akbarzadeh, M., Rashidi, S., Karimi, N. and Ellahi, R., 2018. Convection of heat and thermodynamic irreversibilities in two-phase, turbulent nanofluid flows in solar heaters by corrugated absorber plates. Advanced Powder Technology, 29(9), pp.2243-2254.
[9] Rashidi, S., Karimi, N., Sunden, B., Mahian, O. and Harmand, S., 2020. Passive techniques to enhance heat transfer in various thermal systems. Journal of Thermal Analysis and Calorimetry, 140(3), pp.875-878.
[10] Koo, J. and Kleinstreuer, C., 2005. Laminar nanofluid flow in microheat-sinks. International journal of heat and mass transfer, 48(13), pp.2652-2661.
[11] Jang, S.P. and Choi, S.U., 2006. Cooling performance of a microchannel heat sink with nanofluids. Applied Thermal Engineering, 26(17-18), pp.2457-2463.
[12] Wen, D. and Ding, Y., 2004. Experimental investigation into convective heat transfer of nanofluids at the entrance region under laminar flow conditions. International journal of heat and mass transfer, 47(24), pp.5181-5188.
[13] Fornalik-Wajs, E., Roszko, A. and Donizak, J., 2020. Nanofluid flow driven by thermal and magnetic forces–Experimental and numerical studies. Energy, 201, p.117658.
[14] Hung, T.C., Sheu, T.S. and Yan, W.M., 2012. Optimal thermal design of microchannel heat sinks with different geometric configurations. International communications in heat and mass transfer, 39(10), pp.1572-1577.
[15] He, Y., Men, Y., Zhao, Y., Lu, H. and Ding, Y., 2009. Numerical investigation into the convective heat transfer of TiO2 nanofluids flowing through a straight tube under the laminar flow conditions. Applied Thermal Engineering, 29(10), pp.1965-1972.
[16] Mirzaei, M. and Dehghan, M., 2013. Investigation of flow and heat transfer of nanofluid in microchannel with variable property approach. Heat and Mass Transfer, 49(12), pp.1803-1811.
[17] Chein, R. and Huang, G., 2005. Analysis of microchannel heat sink performance using nanofluids. Applied thermal engineering, 25(17-18), pp.3104-3114.
[18] Peng, H., Guo, W. and Li, M., 2020. Thermal-hydraulic and thermodynamic performances of liquid metal based nanofluid in parabolic trough solar receiver tube. Energy, 192, p.116564.
[19] Wang, Y., Li, Q. and Xuan, Y., 2019. Thermal and chemical reaction performance analyses of solar thermochemical volumetric receiver/reactor with nanofluid. Energy, 189, p.116123.
[20] Huaxu, L., Fuqiang, W., Dong, L., Jie, Z. and Jianyu, T., 2019. Optical properties and transmittances of ZnO-containing nanofluids in spectral splitting photovoltaic/thermal systems. International Journal of Heat and Mass Transfer, 128, pp.668-678.
[21] Huaxu, L., Fuqiang, W., Dong, Z., Ziming, C., Chuanxin, Z., Bo, L. and Huijin, X., 2020. Experimental investigation of cost-effective ZnO nanofluid based spectral splitting CPV/T system. Energy, 194, p.116913.
[22] Aminfar, H., Mohammadpourfard, M. and Kahnamouei, Y.N., 2011. A 3D numerical simulation of mixed convection of a magnetic nanofluid in the presence of non-uniform magnetic field in a vertical tube using two phase mixture model. Journal of Magnetism and Magnetic Materials, 323(15), pp.1963-1972.
[23] Wrobel, W., Fornalik-Wajs, E. and Szmyd, J.S., 2010. Experimental and numerical analysis of thermo-magnetic convection in a vertical annular enclosure. International Journal of Heat and Fluid Flow, 31(6), pp.1019-1031.
[24] Sawada, T., Tanahashi, T. and Ando, T., 1987. Two-dimensional flow of magnetic fluid between two parallel plates. Journal of Magnetism and Magnetic Materials, 65(2-3), pp.327-329.
[25] Selimli, S., Recebli, Z. and Arcaklioglu, E., 2015. MHD numerical analyses of hydrodynamically developing laminar liquid lithium duct flow. International Journal of Hydrogen Energy, 40(44), pp.15358-15364.
[26] Zhao, M. and Hu, J., 2012, December. Study on density of magnetic fluid in the strong magnetic field. In 2012 Second International Conference on Instrumentation, Measurement, Computer, Communication and Control (pp. 396-398). IEEE.
[27] Hajialigol, N., Fattahi, A., Ahmadi, M.H., Qomi, M.E. and Kakoli, E., 2015. MHD mixed convection and entropy generation in a 3-D microchannel using Al2O3–water nanofluid. Journal of the Taiwan Institute of Chemical Engineers, 46, pp.30-42.
[28] Aminfar, H., Mohammadpourfard, M. and Zonouzi, S.A., 2013. Numerical study of the ferrofluid flow and heat transfer through a rectangular duct in the presence of a non-uniform transverse magnetic field. Journal of Magnetism and Magnetic materials, 327, pp.31-42.
[29] Ganguly, R., Sen, S. and Puri, I.K., 2004. Heat transfer augmentation using a magnetic fluid under the influence of a line dipole. Journal of Magnetism and Magnetic Materials, 271(1), pp.63-73.
[30] Fadaei, F., Shahrokhi, M., Dehkordi, A.M. and Abbasi, Z., 2017. Heat transfer enhancement of Fe3O4 ferrofluids in the presence of magnetic field. Journal of Magnetism and Magnetic Materials, 429, pp.314-323.
[31] Zeng, J., Deng, Y., Vedantam, P., Tzeng, T.R. and Xuan, X., 2013. Magnetic separation of particles and cells in ferrofluid flow through a straight microchannel using two offset magnets. Journal of Magnetism and Magnetic Materials, 346, pp.118-123.
[32] Sheikholeslami, M., Bandpy, M.G., Ellahi, R. and Zeeshan, A., 2014. Simulation of MHD CuO–water nanofluid flow and convective heat transfer considering Lorentz forces. Journal of Magnetism and Magnetic Materials, 369, pp.69-80.
[33] Zborowski, M., Sun, L., Moore, L.R., Williams, P.S. and Chalmers, J.J., 1999. Continuous cell separation using novel magnetic quadrupole flow sorter. Journal of magnetism and magnetic materials, 194(1-3), pp.224-230.
[34] Hoyos, M., Moore, L., Williams, P.S. and Zborowski, M., 2011. The use of a linear Halbach array combined with a step-SPLITT channel for continuous sorting of magnetic species. Journal of magnetism and magnetic materials, 323(10), pp.1384-1388.
[35] Dehghan, M., Daneshipour, M. and Valipour, M.S., 2018. Nanofluids and converging flow passages: A synergetic conjugate-heat-transfer enhancement of micro heat sinks. International Communications in Heat and Mass Transfer, 97, pp.72-77.
[36] Dehghan, M., Vajedi, H., Daneshipour, M., Pourrajabian, A., Rahgozar, S. and Ilis, G.G., 2020. Pumping power and heat transfer rate of converging microchannel heat sinks: errors associated with the temperature dependency of nanofluids. Journal of Thermal Analysis and Calorimetry, 140(3), pp.1267-1275.
[37] Dehghan, M., Daneshipour, M., Valipour, M.S., Rafee, R. and Saedodin, S., 2015. Enhancing heat transfer in microchannel heat sinks using converging flow passages. Energy Conversion and Management, 92, pp.244-250. | ||
آمار تعداد مشاهده مقاله: 333 تعداد دریافت فایل اصل مقاله: 215 |