تعداد نشریات | 12 |

تعداد شمارهها | 146 |

تعداد مقالات | 1,301 |

تعداد مشاهده مقاله | 1,523,555 |

تعداد دریافت فایل اصل مقاله | 1,119,107 |

## Investigation of natural convection heat transfer of MHD hybrid nanofluid in a triangular enclosure | ||

Journal of Computational & Applied Research in Mechanical Engineering (JCARME) | ||

مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 18 دی 1397 اصل مقاله (1.16 MB) | ||

نوع مقاله: Research Paper | ||

شناسه دیجیتال (DOI): 10.22061/jcarme.2019.3197.1353 | ||

نویسندگان | ||

Ali Akbar rashidi؛ Ehsan Kianpour ^{}
| ||

^{}Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran | ||

چکیده | ||

Natural convection heat transfer is studied numerically in a triangular enclosure. The enclosure is isosceles right triangle and its bottom wall is hot, the hypotenuse is cold and the other wall is adiabatic. Also, a vertical magnetic field is applied in the enclosure, and there is hybrid nanofluid inside the enclosure. This study is conducted for Rayleigh numbers of 103-105, the Hartmann numbers between 0-80, and the volume fraction of nanofluid is between 0-2 percent. Based on the obtained results, as the Hartmann number augments, the temperature of the center of the enclosure decreases due to weakening of the heat transfer flow by increasing the magnetic field forces. In addition, as the Hartmann number augments, the streamlines approach to the walls because the horizontal momentum forces decrease when the Hartmann number increases. Furthermore, by increasing the density of nanoparticles, the heat transfer rate increase, and as a result, heat transfer builds up. Finally, heat transfer improve when the hybrid-nanofluid is employed rather than ordinary nanofluid. | ||

کلیدواژهها | ||

Hybrid nanofluid؛ Natural Convection؛ heat transfer؛ Magnetic field | ||

مراجع | ||

[1] M. Abbaszadeh, A. Ababaei, A. A. A. Arani, and A. A. Sharifabadi, "MHD forced convection and entropy generation of CuO-water nanofluid in a microchannel considering slip velocity and temperature jump," Journal of the Brazilian Society of Mechanical Sciences and Engineering, vol. 39, no. 3, pp. 775–790, 2017.
[2] A. Aghaei, H. Khorasanizadeh, G. a. Sheikhzadeh, and M. Abbaszadeh, "Numerical study of magnetic field on mixed convection and entropy generation of nanofluid in a trapezoidal enclosure," Journal of Magnetism and Magnetic Materials, vol. 403, pp. 133-145, 2016.
[3] A. R. Rahmati, A. R. Roknabadi, and M. Abbaszadeh, "Numerical simulation of mixed convection heat transfer of nanofluid in a double lid-driven cavity using lattice Boltzmann method," Alexandria Engineering Journal, vol. 55, no. 4, pp. 3101-3114, 2016.
[4] M. Mollamahdi, M. Abbaszadeh, and G. A. Sheikhzadeh, "Flow field and heat transfer in a channel with a permeable wall filled with Al2O3-Cu/water micropolar hybrid nanofluid, effects of chemical reaction and magnetic field," Journal of Heat and Mass Transfer Research (JHMTR), vol. 3, no. 2, pp. 101-114, 2016.
[5] G. Sheikhzadeh, H. Ghasemi, and M. Abbaszadeh, "Investigation of natural convection boundary layer heat and mass transfer of MHD water-AL2O3 nanofluid in a porous medium," International Journal of Nano Studies & Technology (IJNST), vol. 5, no. 2, pp. 110-122, 2016.
[6] G. Sheikhzadeh, A. Aghaei, H. Ehteram, and M. Abbaszadeh, "Analytical study of parameters affecting entropy generation of nanofluid turbulent flow in channel and micro-channel," Thermal Science, 2016.
[7] A. Abbasian Arani, J. Amani, and M. Hemmat Esfeh, "Numerical simulation of mixed convection flows in a square double lid-driven cavity partially heated using nanofluid," Journal of Nanostructures, vol. 2, no. 3, pp. 301-311, 2012.
[8] A. Ababaei, M. Abbaszadeh, A. Arefmanesh, and A. J. J. N. H. T. Chamkha, Part A: Applications, "Numerical simulation of double-diffusive mixed convection and entropy generation in a lid-driven trapezoidal enclosure with a heat source," pp. 1-19, 2018.
[9] A. Abbasian Arani, M. Abbaszadeh, and A. J. T. P. N. M. S. Ardeshiri, "Mixed convection fluid flow and heat transfer and optimal distribution of discrete heat sources location in a cavity filled with nanofluid," vol. 5, no. 1, pp. 30-43, 2016.
[10] A. Ababaei, M. Abbaszadeh, and A. A. Abbasian Arani, "Determining the optimum arrangement of micromixers in a microchannel filled with CuO-water nanofluid via minimizing entropy generation," in Defect and Diffusion Forum, 2017, vol. 378, pp. 39-58: Trans Tech Publ.
[11] A. Ababaei and M. J. G. J. o. N. Abbaszadeh, "Second Law Analyses of Forced Convection of Low-Reynolds-Number Slip Flow of Nanofluid Inside a Microchannel with Square Impediments," vol. 1, no. 4, 2017.
[12] K. Khanafer, K. J. I. j. o. h. Vafai, and m. transfer, "A critical synthesis of thermophysical characteristics of nanofluids," vol. 54, no. 19-20, pp. 4410-4428, 2011.
[13] I. Hashim, A. Alsabery, M. Sheremet, and A. J. A. P. T. Chamkha, "Numerical investigation of natural convection of Al2O3-water nanofluid in a wavy cavity with conductive inner block using Buongiorno’s two-phase model," 2018.
[14] S. Suresh, K. Venkitaraj, P. Selvakumar, and M. Chandrasekar, "Synthesis of Al 2 O 3–Cu/water hybrid nanofluids using two step method and its thermo physical properties," Colloids and Surfaces A: Physicochemical and Engineering Aspects, vol. 388, no. 1, pp. 41-48, 2011.
[15] M. Mollamahdi, M. Abbaszadeh, and G. A. J. S. I. Sheikhzadeh, "Analytical study of Al2O3-Cu/water micropolar hybrid nanofluid in a porous channel with expanding/contracting walls in the presence of magnetic field," vol. 25, no. 1, pp. 208-220, 2018.
[16] S. Suresh, K. Venkitaraj, P. Selvakumar, and M. Chandrasekar, "Effect of Al 2 O 3–Cu/water hybrid nanofluid in heat transfer," Experimental Thermal and Fluid Science, vol. 38, pp. 54-60, 2012.
[17] A. Moghadassi, E. Ghomi, and F. Parvizian, "A numerical study of water based Al 2 O 3 and Al 2 O 3–Cu hybrid nanofluid effect on forced convective heat transfer," International Journal of Thermal Sciences, vol. 92, pp. 50-57, 2015.
[18] R. S. Kaluri, R. Anandalakshmi, and T. J. I. J. o. T. S. Basak, "Bejan’s heatline analysis of natural convection in right-angled triangular enclosures: effects of aspect-ratio and thermal boundary conditions," vol. 49, no. 9, pp. 1576-1592, 2010.
[19] S. K. Das, S. U. Choi, W. Yu, and T. Pradeep, Nanofluids: science and technology. John Wiley & Sons, 2007.
[20] Y. Xuan and W. Roetzel, "Conceptions for heat transfer correlation of nanofluids," International Journal of heat and Mass transfer, vol. 43, no. 19, pp. 3701-3707, 2000.
[21] A. El Jery, N. Hidouri, M. Magherbi, and A. B. Brahim, "Effect of an external oriented magnetic field on entropy generation in natural convection," Entropy, vol. 12, no. 6, pp. 1391-1417, 2010.
[22] M. Mollamahdi, M. Abbaszadeh, and G. A. Sheikhzadeh, "Flow field and heat transfer in a channel with a permeable wall filled with Al2O3-Cu/water micropolar hybrid nanofluid, effects of chemical reaction and magnetic field," Journal of Heat and Mass Transfer Research (JHMTR), 2016.
[23] R. S. Kaluri, R. Anandalakshmi, and T. Basak, "Bejan’s heatline analysis of natural convection in right-angled triangular enclosures: effects of aspect-ratio and thermal boundary conditions," International Journal of Thermal Sciences, vol. 49, no. 9, pp. 1576-1592, 2010.
[24] G. Yesiloz and O. Aydin, "Laminar natural convection in right-angled triangular enclosures heated and cooled on adjacent walls," International Journal of Heat and Mass Transfer, vol. 60, pp. 365-374, 2013.
[25] H. Brinkman, "The viscosity of concentrated suspensions and solutions," The Journal of Chemical Physics, vol. 20, no. 4, pp. 571-571, 1952.
[26] J. Maxwcll-Garnctt, "Colours in metal glasses and in metal films," Trans. R. Soc. London, vol. 203, pp. 385-420, 1904.
| ||

آمار تعداد مشاهده مقاله: 208 تعداد دریافت فایل اصل مقاله: 240 |