Investigation of convective heat transfer, pressure drop and efficiency of ZnO/water nanofluid in alternating elliptical axis tubes

Sajadi, Ahmadreza; Talebi, Sasan

doi:10.22059/ees.2020.44634

Investigation of convective heat transfer, pressure drop and efficiency of ZnO/water nanofluid in alternating elliptical axis tubes

Document Type : Research Paper

Authors

Faculty of Engineering, Shahrekord University, Shahrekord, Iran

10.22059/ees.2020.44634

Abstract

In this study, for the first time, the heat transfer and the pressure drop of zinc oxide nanoparticles in alternating elliptical axis (AEA) tube have been investigated experimentally. The zinc oxide nanoparticles were at volumetric concentrations 1% and 2%. The base fluid was heat transfer oil and the experiments were conducted at constant wall temperature. Also, the study was done in Reynolds number range of 400- 1900. The experimental results show that the heat transfer, pressure drop and, the efficiency of AEA tubes are higher than the circular tube. The heat transfer rate and pressure drop increase by flattening the tube and adding nanoparticles. To compare the heat transfer and pressure drop simultaneously, an efficiency parameter is defined. This parameter shows how much increase in heat transfer can be obtained for the pressure drop of a circular tube with the same hydraulic diameter as the AEA tube. Using AEA tube with nanoparticles increases heat transfers by up to threefold, and pressure drop by up to twofold, resulting in an overall twofold increase in the efficiency.

Keywords

References

[1] Bergles A. and Web R., Augmentation of convective heat and mass transfer, ASME, New York, 1970.

[2] 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.

[3] 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

[4] 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

[5] Tehmina A. and Kim H., Heat transfer and pressure drop correlations of nanofluids, Renewable and Sustainable Energy Reviews, 2018 (91): 564-583

[6] Chiam H. et al., Numerical study of nanofluid heat transfer for different tube geometries – A comprehensive review on performance, International Communications in Heat and Mass Transfer, 2017 (86): 60-70

[7] Orlando A. et al., Experimental analysis of the thermal-hydraulic performance of water based silver and SWCNT nanofluids in single-phase flow, Applied Thermal Engineering, 2017 (124): 1176-1188.

[8] Samina J. et al., Internal convective heat transfer of nanofluids in different flow regimes: A comprehensive review, Statistical Mechanics and its Applications, 2020 (538): 122783

[9] 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

[10] Zheng L. and young H., Numerical investigation on heat transfer and flow characteristics in helically coiled mini-tubes equipped with dimples, International Journal of Heat and Mass Transfer, 2018(126): 544-570

[11] Cattani L. et al., Elliptical double corrugated tubes for enhanced heat transfer, International Journal of Heat and Mass Transfer, 2019 (128): 363-377

[12] Najafi H. and Nazif 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) 237-247

[13] Zho T. et al., Numerical investigation of heat transfer for elliptical tube in granular flow using DEM, Energy Procedia, 2019 (158) 5504-5509

[14] Cheng J. et al., Analysis of heat transfer and flow resistance of twisted oval tube in low Reynolds number flow, international journal of heat and mass transfer, (2017) (109) 761-777

[15] Peng L. et al., Heat transfer enhancement for laminar flow in a tube using bidirectional conical strip inserts, International Journal of Heat and Mass Transfer, 2018 (127) 1064-1076.

[16] Najafi N. et al., 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) 237-247

[17] Hong Y. et al., Thermal-hydraulic performances in multiple twisted tapes inserted sinusoidal rib tube heat exchangers for exhaust gas heat recovery applications, Energy Conversion and Management, 2019 (185), 271-290

[18] Juan D. et al., Laminar thermal and fluid flow characteristics in tubes with sinusoidal ribs, International Journal of Heat and Mass Transfer, 2018 (120) 635-651

[19] Sajadi A. et al., Experimental and numerical study on heat transfer, flow resistance, and compactness of alternating flattened tubes, Applied Thermal Engineering, 2016 (108) 740-750

[20] Feng X. et al., Study of heat transfer in oscillatory flow for a Sterling engine heating tube inserted with spiral spring, Applied Thermal Engineering, 2018 (143) 182-192

[21] Paisarn N. and SongkranW., Experimental study on laminar pulsating flow and heat transfer of nanofluids in micro-fins tube with magnetic fields, International Journal of Heat and Mass Transfer 2018 (118): 297-303

[22] Feng X. et al., Numerical study on flow characteristics and heat transfer enhancement of oscillatory flow in a spirally corrugated tube, International Journal of Heat and Mass Transfer, 2018 (127): 402-413

[23] Hatami M. et al., Variable magnetic field (VMF) effect on the heat transfer of a half-annulus cavity filled by Fe₃O₄-water nanofluid under constant heat flux, Journal of Magnetism and Magnetic Materials, 2018 (451): 173-182

[24] ShaoW. et al., Experimental test and empirical correlation development for heat transfer enhancement under ultrasonic vibration, Applied Thermal Engineering 2018 (143): 639-649

[25] Goharkhah M. et al., Convective heat transfer characteristics of magnetite nanofluid under the influence of constant and alternating magnetic field, Powder Technol, 2015 (274): 258-268

[26] Ningbo et al., Numerical investigations of laminar heat transfer and flow performance of Al2O3–water nanofluids in a flat tube, International Journal of Heat and Mass Transfer 2016 (92): 268-282

[27] Saravanan R. et al., Heat transfer enhancement through nano-fluids and twisted tape insert with rectangular cut on its rib in a double pipe heat exchanger, materials today proceedings, 2020 (21): 865-869

[28] Zheng H. et al., Numerical investigation on heat transfer performance and flow characteristics in circular tubes with dimpled twisted tapes using Al₂O₃-water nanofluid, International Journal of Heat and Mass Transfer, 2017 (111): 962-981

[29] Karami M.et al., Heat Transfer and Pressure Drop Characteristics of Nanofluid Flows Inside Corrugated Tubes, Heat Transfer Engineering, 2015 (0): 1-9

[30] Gnanavel C. et al, Heat transfer augmentation by nano-fluids and Spiral Spring insert in Double Tube Heat Exchanger – A numerical exploration, materials today proceedings, 2020 (21): 857-861

[31] Anbu S. et al., Convective heat transfer studies on helically corrugated tubes with spiraled rod inserts using TiO₂/DI water nanofluids, Journal of Thermal Analysis and Calorimetry, 2019 (137): 849-864

[32] 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): 124-130

[33] Incropera F.P., David P, introduction to heat transfer, (2002) 1-506, ISBN 978-600-5107-50-0