Effects of Coil Pitch Spacing on Heat Transfer Performance of Nanofluid Turbulent Flow through Helical Microtube Heat Exchanger

 
 
 
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  • Abstract


    This article provides Numerical simulation on forced convective heat transfer performance of Nanofluid flowing through copper helical microtube of inner diameter of 1.5 mm with different pitch using ANSYS-FLUENT 18.0. The simulation was performed for water, CuO/water, Al2O3/water Nanofluid with 1-2% volume concentration and different pitch of microtube (10, 14 and 18 mm) for turbulent flow regime of Reynolds number varied 5000 to 20000 and governing equations of mass, momentum and heat transfer were solved simultaneously, using the k-e two equations turbulence model. Based on the obtained results, regardless of the concentrations used, the nanofluids exhibited a higher transfer rate than water. This is mainly attributed to the nanoparticles that are in the used nanofluids. The friction factor and the heat transfer rate were enhanced considerably due to the shape and size of the tube, which in this case is a helical microtube. Moreover, the maximum heat transfer performance has been conducted by Al2O3/water Nanofluid with 2% volume concentration and microtube pitch of 18 mm.  

     

     

  • Keywords


    Heat transfer enhancements, Helical micro coil Nanofluids, Mathematical model

  • References


      [1] Gugulothu, R., Reddy, K. V. K., Somanchi, N. S., & Adithya, E. L. (2017). A review on enhancement of heat transfer techniques. Materials Today: Proceedings, 4(2), 1051-1056.

      [2] Yilmaz, M., Comakli, O., Yapici, S. & Sara, O. N. 2003. Heat Transfer and Friction Characteristics in Decaying Swirl Flow Generated by Different Radial Guide Vane Swirl Generators. Energy Conversion and Management 44(2): 283-300

      [3] Omidi, M., Farhadi, M., & Jafari, M. (2017). A comprehensive review on double pipe heat exchangers. Applied Thermal Engineering, 110, 1075-1090

      [4] Xuan, Y. & Li, Q. 2003. Investigation on Convective Heat Transfer and Flow Features of Nanofluids. Journal of Heat Transfer 125(1): 151-155.

      [5] Maïga, S. E. B., Nguyen, C. T., Galanis, N., Roy, G., Maré, T. & Coqueux, M. 2006. Heat Transfer Enhancement in Turbulent Tube flow Using Al2O3 Nanoparticle Suspension. International Journal Numerical Methods Heat Fluid Flow 16(3): 275-292.

      [6] Namburu, P. K., Das, D. K., Tanguturi, K. M. & Vajjha, R. S. 2009. Numerical Study of Turbulent Flow and Heat Transfer Characteristics of Nanofluids Considering Variable Properties. International Journal of Thermal Sciences 48(2): 290-302.

      [7] Fotukian, S. M. & Nasr Esfahany, M. 2010. Experimental Study of Turbulent Convective Heat Transfer and Pressure Drop of Dilute Cuo/Water Nanofluid inside a Circular Tube. International Communications in Heat and Mass Transfer 37(2): 214-219.

      [8] Buongiorno, J. 2005. Convective Transport in Nanofluids. Journal of Heat Transfer 128(3): 240-250.

      [9] Demir, H., Dalkilic, A. S., Kürekci, N. A., Duangthongsuk, W. & Wongwises, S. 2011. Numerical Investigation on the Single Phase Forced Convection Heat Transfer Characteristics of Tio2 Nanofluids in a Double-Tube Counter Flow Heat Exchanger. International Communications in Heat and Mass Transfer 38(2): 218-228.

      [10] Duangthongsuk, W. & Wongwises, S. 2009. Heat Transfer Enhancement and Pressure Drop Characteristics of Tio2–Water Nanofluid in a Double-Tube Counter Flow Heat Exchanger. International Journal of Heat and Mass Transfer 52(7–8): 2059-2067.

      [11] Sajadi, A. R. & Kazemi, M. H. 2011. Investigation of Turbulent Convective Heat Transfer and Pressure Drop of TiO2/Water Nanofluid in Circular Tube. International Communications in Heat and Mass Transfer 38(10): 1474-1478.

      [12] Kayhani, M. H., Soltanzadeh, H., Heyhat, M. M., Nazari, M. & Kowsary, F. 2012. Experimental Study of Convective Heat Transfer and Pressure Drop of TiO2/Water Nanofluid. International Communications in Heat and Mass Transfer 39(3): 456-462.

      [13] N. Xiao, J. Elsnab, T. Ameel, Microtube gas flows with second-order slip flow and temperature jump boundary conditions, International Journal of Thermal Sciences 48 (2009) 243–251.

      [14] J. Koo, C. Kleinstreuer, Viscous dissipation effects in microtubes and microchannels, International Journal of Heat and Mass Transfer 47 (2004) 3159–3169.

      [15] A.K. Satapathy, Slip flow heat transfer in an infinite microtube with axial conduction, International Journal of Thermal Sciences 49 (2010) 153–160.

      [16] H. Wang, Y. Wang, Influence of three-dimensional wall roughness on the laminar flow in microtube, International Journal of Heat and Fluid Flow 28 (2007) 220–228.

      [17] A. Aziz, N. Niedbalski, Thermally developing microtube gas flow with axial conduction and viscous dissipation, International Journal of Thermal Sciences 50 (2011) 332–340.

      [18] Vajjha, R. S., D. K. Das and D. P. Kulkarni (2010). "Development of new correlations for convective heat transfer and friction factor in turbulent regime for nanofluids." International Journal of Heat and Mass Transfer 53(21): 4607-4618

      [19] Vajjha, R. S. and D. K. Das (2012). "A review and analysis on influence of temperature and concentration of nanofluids on thermophysical properties, heat transfer and pumping power." International journal of heat and mass transfer 55(15): 4063-4078...


 

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Article ID: 27674
 
DOI: 10.14419/ijet.v7i4.14.27674




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