[1] Liu S. and Sakr M., A comprehensive review on passive heat transfer enhancements in pipe exchangers, Renewable and Sustainable Energy Reviews, 2013 (19) p:64-81
[2] Chen L. and Dung W., Numerical study on heat transfer characteristics of double tube heat exchangers with alternating horizontal or vertical oval cross-section pipes as inner tubes, Energy Conversion and Management, 2007 (49) p: 1574–1583
[3] Setareh M. Et al. Experimental and numerical study on heat transfer enhancement using ultrasonic vibration in a double-pipe heat exchanger, Applied Thermal Engineering, 2019 (159): 113867.
[7] Ramezani A., NATURAL CONVECTION HEAT TRANSFER IN AN ENCLOSURE FILLED WITH Fe3O4 FERROFLUID UNDER STATIC MAGNETIC FIELD, Journal of Enhanced Heat Transfer, 2022(29) P:27-54
[8] Andrade, F. et al., Experimental investigation on heat transfer and pressure drop of internal flow in corrugated tubes, International Journal of Heat and Mass Transfer, 2019(140): 940-955
[9] Cattani, L. et al., Elliptical double corrugated tubes for enhanced heat transfer, International Journal of Heat and Mass Transfer, 2019(128): 363-377
[10] Xie, S., et al., Numerical investigation on heat transfer performance and flow characteristics in enhanced tube with dimples and protrusions. International Journal of Heat and Mass Transfer, 2018. 122: p. 602-613.
[11] Xie, S., et al., Numerical investigation on flow and heat transfer in dimpled tube with teardrop dimples. International Journal of Heat and Mass Transfer, 2019. 131: p. 713-723.
[12] Sajadi, A.R., et al., Experimental and numerical study on heat transfer, flow resistance, and compactness of alternating flattened tubes. Applied Thermal Engineering, 2016. 108: p. 740-750.
[13] Sajadi, A., et al., Experimental and numerical study on heat transfer and flow resistance of oil flow in alternating elliptical axis tubes. International Journal of Heat and Mass Transfer, 2014. 77: p. 124-130.
[14] Rukruang, A., et al., Experimental and numerical study on heat transfer and flow characteristics in an alternating crossâsection flattened tube. Heat Transfer Asian Research, 2019. 48(3): p. 817-834.
[15] Najafi, H. and Nazif, H.R. Numerical analysis on convective turbulent air in an alternating elliptical tube. Modarres Mechanical Engineering, 2017. 16(13): p. 5-8.
[16] Sajadi, A., et al., Experimental study on turbulent convective heat transfer, pressure drop, and thermal performance characterization of ZnO/water nanofluid flow in a circular tube, Thermal Science, 2014. 18 (4), p. 1315-1326
[19] Ahmed M. et al., Influence of nano-particles addition on hydrodynamics and heat transfer in laminar flow entrance region inside tube, Alexandria Engineering Journal, 2018(57): 4091-4102
[20] Chowdhury Z. et al., Effect of ZnO-water based nanofluids from sonochemical synthesis method on heat transfer in a circular flow passage, International Communications in Heat and Mass Transfer, 2020(114): 104591
[21] Sajadi A. and Kazemi M., Investigation of turbulent convective heat transfer and pressure drop of TiO2/water nanofluid in circular tube, International Communications in Heat and Mass Transfer, 2011(38) 1474-1478
[22] Lee, M.W.T. and Kummar, P., Numerical Study of Flow and Heat Transfer with ZnO-Water Nanofluid in Flattened Tubes. Chemical Product and Process Modeling, 2019. 15(3).
[23] Ahmad, R., Experimental investigation of convective heat transfer and friction factor of Al2o3/water nanofluid in helically corrugated tube, Experimental Thermal and Fluid Science, 2014. 57(1), p. 188-199
[24] Naghibzadeh, S., et al., Heat transfer enhancement of a nanofluid in a helical coil with flattened cross-section. Chemical Engineering Research and Design, 2019. 146: p. 36-47.
[25] Huminic, G. and Huminic, A., The heat transfer performances and entropy generation analysis of hybrid nanofluids in a flattened tube. International Journal of Heat and Mass Transfer, 2018. 119: p. 813-827.
[26] Najafi, H.Kh. and Nazif, H.R., Entropy generation analysis of convective turbulent flow in alternating elliptical axis tubes with different angles between pitches; a numerical investigation. Heat and Mass Transfer, 2019. 55(10): p. 2857-2872.
[27] Najafi, H.Kh. and Nazif, H.R., Investigation of heat transfer and pressure drop of turbulent flow in tubes with successive alternating wall deformation under constant wall temperature boundary conditions. Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2018. 40(2): p. 1-16.
[28] Najafi, H.Kh. and Nazif, H.R., The effect of multi-longitudinal vortex generation on turbulent convective heat transfer within alternating elliptical axis tubes with various alternative angles. Case studies in thermal engineering, 2018. 12: p. 237-247.
[29] Nakhchi, M. and J. Esfahani, Numerical investigation of turbulent Cu-water nanofluid in heat exchanger tube equipped with perforated conical rings. Advanced Powder Technology, 2019. 30(7): p. 1338-1347.
[30] Sajadi, A. and Talebi, S., Experimental investigation of heat transfer, pressure drop, and efficiency of TiO2/Oil nanofluid in alternating flattened tubes. Energy Equipment and Systems, 2022. 10(2): p. 123-136.
[31] Sajadi, A. and Talebi, S., Investigation of convective heat transfer, pressure drop and efficiency of ZnO/water nanofluid in alternating elliptical axis tubes. Energy Equipment and Systems, 2020. 8(3): p. 203-215.
[32] Incropera F.P., David P, introduction to heat transfer, (2002) 1-506, ISBN 978-600-5107-50-0