Hydrodynamic-thermal Variations of a Nanofluid in a Tube Equipped with a Twisted Tape

Authors

Abstract

Thermal energy is one of the most important issues in most industries because the conversion of energy from fossil fuels to thermal energy occurs in almost all conventional industries. Therefore, regarding the lack of fossil resources and the ever-increasing pollution of human environment researchers should take notice of the proper use of thermal energy .In recent years, the focus has been directed towards the use of new technologies to increase the efficiency of thermal systems, including heat exchangers. Among these technologies which are considered in this paper is the simultaneous use of nanofluids and torsion strips which are placed inside the heat exchanger tube. In the present numerical study, a two-phase Euler-Lagrangian numerical simulation has been used for the first time in this geometry to overcome the shortcomings of previous monophasic studies. The effects of independent variables such as the volume fraction of nano-particles, Reynolds number, and the structural variables of the torsion bar such as the shear and the torque ratio on heat transfer and the coefficient of friction- have been investigated. The results show that other variables except for Reynolds have the same qualitative effects on heat transfer and friction coefficient.

Keywords

Main Subjects


[1] Naik, M. T., Janardana, G. R., & Sundar, L. S., "Experimental Investigation of Heat Transfer and Friction Factor with Water–propylene glycol based CuO Nanofluid in a Tube with Twisted Tape inserts", International Communications in Heat and Mass Transfer, Vol. 46, pp.13-21, 2013. [2] Naik, M. T., Fahad, S. S., Sundar, L. S., & Singh, M. K., "Comparative Study on Thermal Performance of Twisted Tape and Wire Coil inserts in Turbulent Flow using CuO/water Nanofluid", Experimental Thermal and Fluid Science, Vol. 57, pp. 65-76, 2014. [3] Azmi, W. H., Sharma, K. V., Mamat, R., & Anuar, S., "Turbulent Forced Convection Heat Transfer of Nanofluids with Twisted Tape insert in a Plain Tube", Energy procedia, Vol. 52, pp. 296-307, 2014. [4] Prasad, P. D., Gupta, A. V. S. S. K. S., & Deepak, K., "Investigation of Trapezoidal-Cut Twisted Tape Insert in a Double Pipe U-Tube Heat Exchanger using Al2O3/Water Nanofluid", Procedia Materials Science, Vol. 10, pp. 50-63, 2015. [5] Khoshvaght-Aliabadi, M., & Eskandari, M., "Influence of Twist Length Variations on Thermal–Hydraulic Specifications of Twisted-Tape inserts in Presence of Cu–water Nanofluid", Experimental Thermal and Fluid Science, Vol. 61, pp. 230-240, 2015. [6] Khoshvaght-Aliabadi, M., Shabanpour, H., Alizadeh, A., & Sartipzadeh, O., "Experimental Assessment of Different Inserts inside Straight Tubes: Nanofluid as Working Media." Chemical Engineering and Processing: Process Intensification, Vol. 97, pp. 1-11, 2015. [7] Azmi, W. H., Sharma, K. V., Sarma, P. K., Mamat, R., Anuar, S., & Sundar, L. S., "Numerical Validation of Experimental Heat Transfer Coefficient with SiO2 Nanofluid Flowing in a Tube with Twisted Tape Inserts", Applied Thermal Engineering, Vol. 73, No. 1, pp. 296-306, 2014. [8] Eiamsa-ard, S., & Kiatkittipong, K., "Heat Transfer Enhancement by Multiple Twisted Tape Inserts and TiO2/Water Nanofluid", Applied Thermal Engineering, Vol. 70, No. 1, pp. 896-924, 2014. [9] Eiamsa-ard, S., Kiatkittipong, K., & Jedsadaratanachai, W., "Heat Transfer Enhancement of TiO2/Water Nanofluid in a Heat Exchanger Tube Equipped with Overlapped Dual Twisted-Tapes", Engineering Science and Technology, an International Journal, Vol. 18, No. 3, pp. 336-350, 2015. [10] Behzadmehr, A., Saffar-Avval, M., & Galanis, N., "Prediction of Turbulent Forced Convection of a Nanofluid in a Tube with Uniform Heat Flux using a Two Phase Approach", International Journal of Heat and Fluid Flow, Vol. 28, No. 2, pp. 211-219, 2007. [11] 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, Vol. 29, No. 10, pp. 1965-1972, 2009. [12] Fard, M. H., Esfahany, M. N., & Talaie, M. R., "Numerical Study of Convective Heat Transfer of Nanofluids in a Circular Tube Two-phase Model versus Single-phase Model." International Communications in Heat and Mass Transfer, Vol. 37, No. 1, pp. 91-97, 2010. [13] Patankar, S. V., "Numerical Heat Transfer and Fluid Flow", John Wiley and Sons, 1984. [14] Van Doormaal, J. P., & Raithby, G. D., "Enhancements of the SIMPLE Method for Predicting Incompressible Fluid Flows", Numerical heat transfer, Vol. 7, No. 2, pp. 147-163, 1984. [15] Ounis, H., Ahmadi, G., & McLaughlin, J. B., "Brownian Diffusion of Submicrometer Particles in the Viscous Sublayer", Journal of Colloid and Interface Science, Vol. 143, No.1, pp. 266-277, 1991. [16] Saffman, P. G. T., "The Lift on a Small Sphere in a Slow Shear Flow", Journal of fluid mechanics, Vol. 22, No.2, pp. 385-400, 1965. [17] Talbot, L., Cheng, R. K., Schefer, R. W., & Willis, D. R.,"Thermophoresis of Particles in a Heated Boundary Layer", Journal of Fluid Mechanics, Vol. 101, No. 04, pp. 737-758, 1980. [18] Ranz, W. E., "Evaporation from Drops: Part II", Chem. Engng. Prog. Vol. 48, pp. 173-180, 1952. [19] Bejan, A., "Convective Heat Transfer", Third ed. New Jersey: John Wiley & Sons, Inc., 2004. [20] Ansys Team, "Fluent Ansys. 12.0 User’s guide", User Inputs for Porous Media 6, 2009. [21] Nguyen, V. B., Nguyen, Q. B., Zhang, Y. W., Lim, C. Y. H., & Khoo, B. C., "Effect of Particle Size on Erosion Characteristics", Wear, Vol. 348, pp. 126-137, 2016. [22] Sundar, L. S., & Sharma, K. V., "Turbulent Heat Transfer [23] and Friction Factor of Al2O3 Nanofluid in Circular Tube with Twisted Tape Inserts", International Journal of Heat and Mass Transfer, Vol. 53, No. 7, pp. 1409-1416, 2010. [24] کاظمی، خدیجه، شیخ‌زاده، قنبرعلی، نظیفی‌فرد، محمد، مداحیان، رضا، شبیه‌سازی عددی دوفازی نانوسیال در یک لوله با نوار چرخان: انتخاب مدل آشفتگی مناسب، هفدهمین کنفرانس دینامیک شاره‌ها FD2017، شاهرود، دانشگاه صنعتی شاهرود، 5-7 شهریور 1396. [25] Kumar, N. R., Bhramara, P., Addis, B. M., Sundar, L. S., Singh, M. K., & Sousa, A. C., "Experimental Heat Transfer, Friction Factor and Effectiveness Analysis of Fe3O4 Nanofluid Flow in a Horizontal Plain Tube with Return Bend and Wire Coil Inserts", International Journal of Heat and Mass Transfer, Vol. 109, pp. 440-453, 2017. [26] Kheradmand, S., Esmailian, M., & Fatahy, A., "Numerical Simulation of the Combination Effect of External Magnetic Field and Rotating Workpiece on Abrasive Flow Finishing", Journal of Mechanical Science and Technology, Vol. 31, No. 4, pp. 1835-1841, 2017. [27] Promvonge, P., "Thermal Augmentation in Circular Tube with Twisted Tape and Wire Coil Turbulators", Energy Conversion and Management, Vol. 49, No.11, pp. 2949-2955, 2008. [28] Wongcharee, K., & Eiamsa-Ard, S., "Enhancement of Heat Transfer using CuO/Water Nanofluid and Twisted Tape with Alternate Axis", International Communications in Heat and Mass Transfer, Vol. 38, No .6, pp. 742-748, 2011.