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Numerical investigation of laminar forced convection heat transfer in rectangular channels with different block geometries using nano-fluids

This research investigates the laminar steady forced convection heat transfer of a copper-water nano-fluid in a two-dimensional horizontal channel with different block geometries attached to the bottom wall. The block geometries assumed in this research are triangular and curve blocks. The governing equations associated with the required boundary conditions are solved using finite volume method based on the SIMPLE technique and the effects of Reynolds number, nano-fluid volume fraction, block geometry and the numbers of blocks on the local and average Nusselt numbers are explored. The obtained results show that nano-particles can effectively enhance the heat transfer in a channel. Furthermore, the local and average Nusselt number distribution is strongly dependent on the block geometry. As observed, the heat transfer augments with the increase in the Reynolds number and nano-fluid volume fraction for both block geometries. It is also concluded that the average Nusselt number of the curve block is higher than that of the triangular block for different Reynolds numbers which declares the importance of the block geometry in the heat transfer enhancement.
PAPER REVISED: 2015-06-08
PAPER ACCEPTED: 2015-06-30
  1. Demirel, Y., Al-Ali, H.H., Abu-Al-Saud, B.A., Enhancement of convection heat transfer in a rectangular duct, Applied Energy, 64 (1999), 1-4, pp. 441-451.
  2. Khanafer, K., Vafai, K., Lightstone, M., Buoyancy driven heat transfer enhancement in a two-dimensional enclosure utilizing nano-fluids, International Journal of Heat and Mass Transfer, 46 (2003), 19, pp. 3639-3653.
  3. Young, T.J., Vafai, K., Experimental and numerical investigation of forced convective characteristics of array of channel mounted obstacles, ASME Journal of Heat Transfer, 121 (1999), 1, pp. 34-42.
  4. a a, S.E.B., Nguyen, C.T., Galanis, N., Roy, G., Heat transfer behaviours of nanofluids in a uniformly heated tube, Superlattices and Microstructure,s 35 (2004), 3-6, pp. 543-557.
  5. aï a S.E.B., Palm, S.J., Nguyen, C.T., Roy, G., Galanis, N., Heat transfer enhancement by using nanofluids in forced convection flows, International Journal of Heat and Fluid Flow, 26 (2005), 4, pp. 530-546.
  6. Zeinali Heris, S., Etemad, S.Gh., Nasr Esfahany, M., Experimental investigation of oxide nano-fluids laminar flow convective heat transfer, International Communications in Heat and Mass Transfer, 33 (2006), 4, pp. 529-535.
  7. Zeinali Heris, S., Nasr Esfahany, M., Etemad, S.Gh., Experimental investigation of convective heat transfer of Al2O3/water nanofluid in circular tube, International Journal of Heat and Fluid Flow, 28 (2007), 2, pp. 203-210.
  8. Ding, Y., Chen, H., He, Y., Lapkin, A., Yeganeh, M., Šiller L., Butenko, Y.V., Forced convective heat transfer of nanofluids, Advanced Powder Technology, 18 (2007), 6, pp. 813-824.
  9. Wang, X.Q., Mujumdar, A.S., Heat transfer characteristics of nanofluids: a review, International Journal of Thermal Science,s 46 (2007), 1, pp. 1-19.
  10. Wang, X.Q., Mujumdar, A.S., A review on nanofluids. Part 1: Theoretical and Numerical investigations, Brazilian Journal of Chemical Engineering, 25 (2008), 4, pp. 613-630.
  11. Mirmasoumi, S., Behzadmehr, A., Effect of nanoparticles mean diameter on mixed convection heat transfer of a nanofluid in a horizontal tube, International Journal of Heat and Fluid Flow, 29 (2008), 2, pp. 557-566.
  12. He, Y., Men, Y., Zhao, Y., Lu, H., Ding, Y., Numerical investigation into the convective heat transfer of TiO2 nanofluids flowing through a straight tube under the laminar flow conditions, Applied Thermal Engineering, 29 (2009), 10, pp. 1965-1972.
  13. Lotfi, R., Saboohi, Y., Rashidi, A.M., Numerical study of forced convective heat transfer of Nanofluids: Comparison of different approaches, International Communications in Heat and Mass Transfer, 37 (2010), 1, pp. 74-78.
  14. Mohammed, H., Gunnasegaran, P., Shuaib, N., Heat transfer in rectangular microchannels heat sink using nanofluids, International Communications in Heat and Mass Transfer,37 (2010), 10, pp. 1496-1503.
  15. Ho, C.J., Wei, L.C., Li, Z.W., An experimental investigation of forced convective cooling performance of a microchannel heat sink with Al2O3/water nanofluid, Applied Thermal Engineering, 30 (2010), 2-3, pp. 96-103.
  16. Peyghambarzadeh, S.M., Hashemabadi, S.H., Seifi Jamnani, M., Hoseini, S.M., Improving the cooling performance of automobile radiator with Al2O3/water nanofluid, Applied Thermal Engineering, 31 (2011), 10, pp. 1833-1838.
  17. Yang, Y.T., Chen, C.H., Numerical simulation of turbulent fluid flow and heat transfer characteristics of heated blocks in the channel with an oscillating cylinder, International Journal of Heat and Mass Transfer, 51 (2008), 7-8, pp. 1603-1612.
  18. Oztop, H.F., Varol, Y., Alnak, D.E., Control of heat transfer and fluid flow using a triangular bar in heated blocks located in a channel, International Communications in Heat and Mass Transfer, 36 (2009), 8, pp. 878-885.
  19. Bakkas, M., Hasnaoui, M., Amahmid, A., Natural convective flows in a horizontal channel provided with heating isothermal blocks: Effect of the inter blocks spacing, Energy Conversion and Management, 51 (2010), 2, pp. 296-304.
  20. Heidary, H., Kermani, M.J., Heat transfer enhancement in a channel with block(s) effect and utilizing Nano-fluid, International Journal of Thermal Sciences, 57 (2012), pp. 163-171.