Document Type : Research Paper

Authors

1 mechanical department , university of technology

2 University of Technology-Iraq

Abstract

This paper presents an experimental and numerical study to investigate the heat transfer enhancement in a horizontal circular tube using hybrid nanofluid (CuO, Al₂O₃/ distilled water) and fitted with twisted tape (typical twisted tape, with twist ratios (TR=9.2). Under fully developed turbulent flow and uniform heat flux conditions, the studied hybrid nanofluid concentrations are (=0.6, 1.22, and 1.8% by volume). The experimental test rig includes all the required instruments to study the heat transfer enhancement. All the tests were carried out with a Reynolds number range of 3560-8320 and uniform heat flux (13217.5 W/m². The twisted tape, manufactured from polylactic acid (PLA) by 3-dimensional printer technology, was inserted inside the tube. In this numerical study, the finite volume method (CFD) procedure was employed to pattern the forced convection turbulent flow through the tube. For hybrid nanofluid with twisted, the maximum enhancement in the maximum thermal performance factor was 2.18 for φ = 1.8%, while for a tube (water with twisted) under the same conditions, it was (2.04). A high Nusselt number was obtained with a concentration of 1.8% and an enhancement in the heat transfer of about 6.70%) than water.

Graphical Abstract

Highlights

  • Hybrid nanofluid in a tube with a typical inserted twisted tape has been investigated experimentally and numerically.
  • The most important basic dimensionless parameters, including Reynolds number, Nusselt number, and Friction factor, have been studied.
  • The results proved that there is a noticeable improvement in heat transfer in the presence of a typical inserted twisted tape.

Keywords

Main Subjects

[1] E. Smithberg and F. Landis, Friction and Forced Convection Heat-Transfer Characteristics in Tubes With Twisted Tape Swirl Generators, J. Heat Transfer., 86 (1964) 39–48. doi: 10.1115/1.3687060.
[2] S. W. Hong and A. E. Bergles, Augmentation of Laminar Flow Heat Transfer in Tubes by Means of Twisted-Tape Inserts,J. Heat Transfer., 98 (1976) 251–256. doi: 10.1115/1.3450527.
[3] R. M. Manglik and A. E. Bergles, Heat Transfer and Pressure Drop Correlations for Twisted-Tape Inserts in Isothermal Tubes: Part II—Transition and Turbulent Flows, J. Heat Transfer., 115 (1993) 890–896.  doi: 10.1115/1.2911384.
[4] Sheikh, N.A.; Ching, D.L.C.; and Khan, I., A Comprehensive review on theoretical aspects of nanofluids: Exact solutions and analysis, Symmetry  12 (2020) 725. [CrossRef].
[5] Dadhich, M.; Prajapati, O. S.; and Sharma, V., Investigation of boiling heat transfer of titania nanofluid flowing through horizontal tube and optimization of results utilizing the desirability function approach, Powder Technol. 378 (2021) 104–123. [CrossRef].
[6] Choi, S. U. S., Enhancing thermal conductivity of fluids with nano-particles,ASME, FED., 231 (1995) 99–105. Accessed: Sep. 12, 2021. [Online]. Available: https://ci.nii.ac.jp/naid/80008813348.
[7] Montasser S. Tahat, and Ali Cemal Benim, Experimental Analysis on Thermophysical Properties of Al2O3/CuO Hybrid Nano Fluid with its Effects on Flat Plate Solar Collector, Defect and Diffusion Forum Submitted: 2017-01-13 , 374 (2017) 148-156 Revised: (2017) 04-05. doi:10.4028/www.scientific.net/DDF.374.148.
[8] Labib M., Nine J., Afrianto H., Chung H., and Jeong H., Numerical investigation on effect of base fluids and hybrid nanofluid in forced convective heat transfer,Int J. of Thermal Sciences, 71 (2013) 163-171.
[9] Sundar L. S., Singh M. K., and Sousa A., Enhanced heat transfer and friction factor of MWCNT–Fe3O4/water hybrid nanofluids, Int Comm in Heat and Mass Transfer, 52 (2014) 73–83.
[10] Bbasi, M. Rashidi A., Nemati A., and Arzani K., The effect of functionalization method on the stability and the thermal conductivity of nanofluid hybrids of carbon nanotubes/gamma alumina, Ceramics International, 39 (2013) 3885–3891.
[11] Mosayebidorcheh, Sheikholeslami M., Hatami M., and Ganji D. D., Analysis of turbulent MHD Couette nanofluid flow and heat transferusing hybrid DTM– FDMS, Particuology, 26 (2016) 95-101.
[12] H. Maddah et al.,Effect of Twisted-Tape Turbulators and Nanofluid on Heat Transfer in a Double Pipe Heat Exchange, Hindawi Publishing Corporation Journal of Engineering Volume Article ID 920970, 9(2014).
[13] S. Eiamsa-ard, and K. Kiatkittipong, Heat transfer enhancement by multiple twisted tape inserts and tio2/water nanofluid, Applied Thermal Engineering, 70 (2014) 896-924.
[14] Ghachem, K.; Aich, W.; and Kolsi, L., Computational analysis of hybrid nanofluid enhanced heat transfer in cross flow micro heat exchanger with rectangular wavy channels, Case Stud. Eng., 24 (2021) 100822. [CrossRef].
[15] Alesbe, Israa, Sahira Hasan Ibrahim, and Sattar Aljabair, Mixed convection heat transfer in multi-Lid-driven trapezoidal annulus filled with hybrid nanofluid, Journal of Physics: Conference Series., 1973. IOP Publishing, 2021.
[16] Aljabair, Sattar, Akeel Abdullah Mohammed, and Israa Alesbe, Natural convection heat transfer in corrugated annuli with H2O-Al2O3 nanofluid.Heliyon., 6 (2020): e05568.
[17] A. Karalah, and Mahmoud, Nabeel. 2016, Experimenal Investigation of Heat Transfer Enhancement with Nanofluid and Twisted Tape Inserts in a Circular Tube, Engineering & Technology Journal. 34 (2016) 664-684.
[18] Moffat, R. J. Describing the uncertainties in experimental results, Experimental Thermal and Fluid Science, Mechanical Engineering, Stanford University, Stanford, California 1988 by Elsevier Science Publishing Co., Inc., 52 Vanderbilt Avenue, New York, NY 10017, 1988.
[19] Bergles A. E. Techniques to Augment Heat Transfer, In: Handbook of Heat Transfer Applications, Ed.  Year
[20] Holman J. P., Heat Transfer, Tenth Edition, by the McGraw-Hill Companies, Inc,2010.
[21] Frank M. White, Fluid Mechanics, Fourth edition, MacGraw-Hill books, 2001.
[22] Behnampour A, Akbari O. A., Safaei M. R., Ghavami M., Marzban A., Ahmadi Sheikh Shabani GR, Zarringhalam M., Mashayekhi R., "Analysis of heat transfer and nanofluid fluid flow in microchan nels with trapezoidal, rectangular and triangular shaped ribs," Physica E., 91(2017) 15–31.