Saidur, R., Leong, K.Y., and Mohammed, H.A., “A Review on Applications and Challenges of Nanofluids”, Renewable and Sustainable Energy Reviews, Vol. 15, No. 3, pp. 1646-1668, (2011).
 Shanthi, R., Anandan, S.S., and Ramalingam, V., “Heat Transfer Enhancement using Nanofluids: An Overview”, Thermal Science, Vol. 16, No. 2, pp. 423-444, (2012).
 Duangthongsuk, W., and Wongwises, S., “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, Vol. 52, No. 7-8, pp. 2059-2067, (2009).
 Esmaeilzadeh, E., Almohammadi, H., Nokhosteen, A., Motezaker, A., and Omrani, A.N., “Study on Heat Transfer and Friction Factor Characteristics of g-Al2O3/water through Circular Tube with Twisted Tape Inserts with Different Thicknesses”, International Journal of Thermal Sciences, Vol. 82, pp. 72-83, (2014).
 Zhou, Rui., He, Fan., Ma, Zhichao, Liang Ping, Shen., Dong, Ming Wang, Hanbin and Wang,Hao, “Characterization and Modeling of Thermal Conductivity of ZnO Nanoparticle–based Transfer Oil NanoFluid”, Journal of Computational and Theoretical NanoScience, Vol. 12, pp. 719-723, (2015).
 Sheikholeslami, M., and Domiri Ganji, D., “Nanofluid Flow and Heat Transfer between Parallel Plates Considering Brownian Motion using DTM”, Computer Methods in Applied Mechanics and Engineering, Vol. 283, pp. 651-663, (2015).
 Bhuiya, A.K., Azad, M.S.U., and Chowdhury, M., Saha., “Heat Transfer Augmentation in a Circular Tube with Perforated Double Counter Twisted Tape Inserts”, International Communications in Heat and Mass Transfer, Vol. 74, pp. 18-26, (2016).
 D. Mali, J., Acharaya, A., and Pise A., “Heat Transfer Enhancement with Centrally Hollow Twisted Tapes in a Tubular Heat Exchanger”, Journal of Material Science and Mechanical Engineering (JMSME), Vol. 3, pp. 187-191, (2016).
 Varun, M.O., Garg, H., Nautiyal, S.M.K., Khurana, S., and Shukla, M.K., “Heat Transfer Augmentation using Twisted Tape Inserts, A Review”, Renewable and Sustainable Energy Reviews, Vol. 63, pp. 193–225, (2016).
 Sun, B., Yang, A., and Yang, D., “Experimental Study on the Heat Transfer and Flow Characteristics of Nanofluids in the Built-in Twisted Belt External Thread Tubes”, J. Heat Mass Transfer, Vol. 107, pp. 712-722, (2017).
 Feyza Akyürek, E., Gelis, K., Sahin, B., and Manay, E., “Experimental Analysis for Heat Transfer of Nanoﬂuid with Wire Coil Turbulators in a Concentric Tube Heat Exchanger”, Results in Physics, Vol. 9, pp. 376-389, (2018).
 Naga Sarada, S., Sita Rama Raju, A.V., Kalyani Radha, K., and Shyam Sunder, L., “Enhancement of Heat Transfer using Varying width Twisted Tape Inserts”, International Journal of Engineering, Science and Technology, Vol. 2, No. 6, pp. 107-118, (2018).
 Gururatana, S., and Skullong, S., “Experimental Investigation of Heat Transfer in a Tube Heat Exchanger with Airfoil-shaped Insert”, Therm., Eng, Vol. 14, pp. 100462, (2019).
 Ma, Y., Jamiatia, M., Aghaei, A., Sepehrirad, M., Dezfulizadeh, A., and Afrand, M., “Effect of Differentially Heated Tubes on Natural Convection Heat Transfer in a Space between Two Adiabatic Horizontal Concentric Cylinders using Nano-fluid”, International Journal of Mechanical Sciences, Vol. 163
, No. 105148, (2019).
 Gnanavel, S., Saravanan, R., and Chandrasekaran, M., “Heat Transfer Augmentation by Nano-fluids and Circular Fin Insert in Double Tube Heat Exchanger a Numerical Exploration”, Materials Today: Proceedings, Vol. 21,
pp. 934-939, (2019).
 Awai, M., Saad, M., Aya, H., Ehsan, M.M., and Bhuiyan, A.A., “Computational Assessment of Nano-particulate (Al2O3/Water) Utilization for Enhancement of Heat Transfer with Varying Straight Section Lengths in a Serpentine Tube Heat Exchanger”, Thermal Science and Engineering Progress, 100521,
 Hamilton, R.L., and Crosser, O.K., “Thermal Conductivity of Heterogeneous Two-Component Systems”, Industrial & Engineering Chemistry Fundamentals, Vol. 1, No. 3, pp. 187-191, (1962).
 Wang, X., Xu, X., and Choi, S.U., “Thermal Conductivity of Nanoparticle-fluid Mixture”, Journal of Thermophysics and Heat Transfer, Vol. 13, No. 4, pp. 474-480, (1999).
 Yu, W., and Choi, S.U.S., “The Role of Interfacial Layers in the Enhanced Thermal Conductivity of Nanofluids: a Renovated Maxwell Model”, Journal of Nanoparticle Research, Vol. 5, No. 1-2, pp. 167-171, (2003).
 Azmi, W.H., Sharma, K.V., Rizalman Mamat, Alias, A.B.S., and Izan Izwan Misnon, "Correlations for Thermal Conductivity and Viscosity of Water Based Nanofluids", 1st International Conference on Mechanical Engineering Research, Kuantan, Malaysia, Vol. 36, pp. 012029, (2012).
 Webb, R.L., "Performance Evaluation Criteria for use of Enhanced Heat Transfer Surfaces in Heat Exchanger Design", Int. J. Heat Mass Transf., Vol. 24, pp. 715–726, (1981).
 Dittus, L.M.K, and Boelter, "Heat Transferin Automobile Radiators of the Tubular Type", University of California at Berkley Publications in Engineering, Vol. 13, pp. 755-758, (1930).
 Incropera, F.P., Dewitt, P.D., Bergman, T.L., and Lavine, A.S., “Foundation of Heat Transfer”, 6th Edition, John Wiley&Sons, Singapore, pte. Ltd, (2013).