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Abstract: A numerical study has been carried out for a laminar steady mixed convection flow in a 2D triangular enclosure with an inner rotating coaxial cylinder, with the enclosure filled with ethylene glycol-silicon carbide (SiC-EG). The thermal conductivity and viscosity of the SiC-EG nanofluids were experimentally determined by using a Decagon Devices KD2 Pro thermal property meter and a rotational Brookfield viscometer, respectively. Various pertinent parameters, such as the dimensionless rotation velocity, solid volume fraction, dimensionless radius of the inner cylinder, and rayleigh numbers, were analyzed to determine their influences on heat transfer and fluid flow. Results clearly show how the direction of rotation of the cylinder affects the thermal performance in a triangular enclosure. It is found that the average Nusselt number increases with rise in the rayleigh number or as more nanoparticles are added to the base liquid. It was also observed that at constant rayleigh number, different rotational conditions have remarkable effects on the flow and heat transfer characteristics.

三角形封闭腔内内含旋转柱体时碳化硅-乙二醇纳米流体层流混合对流传热特性研究

[1]Bararnia, H., Soleimani, S., Ganji, D.D., 2011. Lattice Boltzmann simulation of natural convection around a horizontal elliptic cylinder inside a square enclosure. International Communications in Heat and Mass Transfer, 38(10):1436-1442.

[2]Brinkman, H.C., 1952. The viscosity of concentrated suspensions and solutions. Journal of Chemical Physics, 20(4):571-581.

[3]Choi, S.U.S., Eastman, J.A., 1995. Enhancing thermal conductivity of fluids with nanoparticles. ASME International Mechanical Engineering Congress & Exposition, San Francisco, USA.

[4]Costa, V.A.F., Raimundo, A.M., 2010. Steady mixed convection in a differentially heated square enclosure with an active rotating circular cylinder. International Journal of Heat and Mass Transfer, 53(5-6):1208-1219.

[5]Fu, W.S., Cheng, C.S., Shieh, W.J., 1994. Enhancement of natural convection heat transfer of an enclosure by a rotating circular cylinder. International Journal of Heat and Mass Transfer, 37(13):1885-1897.

[6]Ghaddar, N.K., 1996. Natural convection over rotating cylindrical heat source in an enclosure. Journal of Thermophysics and Heat Transfer, 10(2):303-311.

[7]Ghaddar, N.K., Thiele, F., 1994. Natural convection over a rotating cylindrical heat source in a rectangular enclosure. Numerical Heat Transfer, Part A: Applications: An International Journal of Computation and Methodology, 26(6):701-717.

[8]Ghasemi, B., Aminossadati, S.M., 2010. Brownian motion of nanoparticles in a triangular enclosure with natural convection. International Journal of Thermal Sciences, 49(6):931-940.

[9]Kim, B.S., Lee, D.S., Ha, M.Y., et al., 2008. A numerical study of natural convection in a square enclosure with a circular cylinder at different vertical locations. International Journal of Heat and Mass Transfer, 51(7-8):1888-1906.

[10]Krane, R.J., Jessee, J., 1983. Some detailed field measurements for a natural convection flow in a vertical square enclosure. Proceedings of the First ASME-JSME Thermal Engineering Joint Conference, ASME, New York, 1:323-329.

[11]Kuehn, T.H., Goldstein, R.J., 1976. An experimental and theoretical study of natural convection in the annulus between horizontal concentric cylinders. Journal of Fluid Mechanics, 74(04):695-719.

[12]Lee, J.M., Ha, M.Y., Yoon, H.S., 2010. Natural convection in a square enclosure with a circular cylinder at different horizontal and diagonal locations. International Journal of Heat and Mass Transfer, 53(25-26):5905-5919.

[13]Liao, C.C., Lin, C.A., 2012. Influences of a confined elliptic cylinder at different aspect ratios and inclinations on the laminar natural and mixed convection flows. International Journal of Heat and Mass Transfer, 55(23-24):6638-6650.

[14]Maxwell, J.C., 1904. A Treatise on Electricity and Magnetism. 2nd Edition, Oxford University Press, Cambridge, p.435-441.

[15]Misirlioglu, A., 2006. The effect of rotating cylinder on the heat transfer in a square cavity filled with porous medium. International Journal of Engineering Science, 44(18-19):1173-1187.

[16]Moukalled, F., Acharya, S., 1996. Natural convection in the annulus between concentric horizontal circular and square cylinders. Journal of Thermophysics and Heat Transfer, 10(3):524-531.

[17]Parvin, S., Alim, M.A., Hossain, N.F., 2012. Prandtl number effect on cooling performance of a heated cylinder in an enclosure filled with nanofluids. International Communications in Heat and Mass Transfer, 39(8):1220-1225.

[18]Roslan, R., Saleh, H., Hashim, I., 2012. Effect of rotating cylinder on heat transfer in a square enclosure filled with nanofluids. International Journal of Heat and Mass Transfer, 55(23-24):7247-7256.

[19]Shih, Y., Khodadadi, J., Weng, K., et al., 2009. Periodic fluid flow and heat transfer in a square cavity due to an insulated or isothermal rotating cylinder. Journal of Heat Transfer, 131(11):111701.

[20]Soleimani, S., Sheikholeslami, M., Ganji, D.D., et al., 2012. Natural convection heat transfer in a nanofluid filled semi-annulus enclosure. International Communications in Heat and Mass Transfer, 39(4):565-574.

[21]Xu, X., Yu, Z.T., Hu, Y.C., et al., 2010. A numerical study of laminar natural convective heat transfer around a horizontal cylinder inside a concentric air-filled triangular enclosure. International Journal of Heat and Mass Transfer, 53(1-3):345-355.

[22]Xu, X., Yu, Z.T., Hu, Y.C., et al., 2012. Transient natural convective heat transfer of a low-Prandtl-number fluid from a heated horizontal circular cylinder to its coaxial triangular enclosure. International Journal of Heat and Mass Transfer, 55(4):995-1003.

[23]Yu, Z.T., Xu, X., Hu, Y.C., et al., 2010. Transient natural convective heat transfer from a heated triangular cylinder to its air-filled coaxial cylindrical enclosure. International Journal of Heat and Mass Transfer, 53(19-20):4296-4303.