Abstract
The present paper deals with the forced convection and pressure drop of Al2O3/water and TiO2/water nanofluids with the presence of inserts in a circular tube. The constant heat flux is maintained around the copper tube with the help of a nichrome wire heater. Two types of inserts are used: simple and modified spiral tape inserts. The modified spiral tape is consisting of zig-zag cuts having notches (or grooves) and projected parts. The Nusselt number, friction factor, and thermal performance factor are calculated for different cases: (1) tube with distilled water, (2) tube with distilled water and inserts, and (3) tube with nanofluids and inserts. The empirical correlations are developed for all these cases. For Al2O3/water nanofluids, the Nu values decrease with the increase in concentrations, whereas for TiO2/water nanofluids, the Nu values have highest at 0.05% concentration; then, there is a decreasing order with the concentrations of 0.075% and 0.1%. It is observed that modified spiral tape inserts with twist ratios of 3.04 and 4.35 effectively enhance the heat transfer without extra penalty of pumping power.
References
1.
Raj
, P.
, and Subudhi
, S.
, 2018
, “A Review of Studies Using Nanofluids in Flat-Plate and Direct Absorption Solar Collectors
,” Renewable Sustainable Energy Rev.
, 84
, p. 54
–74
. 2.
Kumar
, A.
, and Subudhi
, S.
, 2019
, “Preparation, Characterization and Heat Transfer Analysis of Nanofluids Used for Engine Cooling
,” Appl. Therm. Eng.
, 160
, p. 114092
. 3.
Zeinali Heris
, S.
, Nasr Esfahany
, M.
, and Etemad
, S. G.
, 2007
, “Experimental Investigation of Convective Heat Transfer of Al2O3/Water Nanofluid in Circular Tube
,” Int. J. Heat Fluid Flow
, 28
(2
), pp. 203
–210
. 4.
Fotukian
, S. M.
, and Nasr Esfahany
, M.
, 2010
, “Experimental Investigation of Turbulent Convective Heat Transfer of Dilute γ-Al2O3/Water Nanofluid Inside a Circular Tube
,” Int. J. Heat Fluid Flow
, 31
(4
), pp. 606
–612
. 5.
Liu
, D.
, and Yu
, L.
, 2011
, “Single-Phase Thermal Transport of Nanofluids in a Minichannel
,” ASME J. Heat Transfer-Trans. ASME
, 133
(3
), p. 031009
. 6.
Nazari
, M.
, Ashouri
, M.
, Kayhani
, M. H.
, and Tamayol
, A.
, 2015
, “Experimental Study of Convective Heat Transfer of a Nanofluid Through a Pipe Filled With Metal Foam
,” Int. J. Therm. Sci.
, 88
, pp. 33
–39
. 7.
Mandal
, S.
, and Ghoshdastidar
, P. S.
, 2020
, “Laminar Forced Convection of Nanofluids in a Circular Tube: A New Nonhomogeneous Flow Model
,” ASME J. Heat Transfer-Trans. ASME
, 142
(2
), p. 022502
. 8.
Choudhary
, R.
, and Subudhi
, S.
, 2016
, “Aspect Ratio Dependence of Turbulent Natural Convection in Al2O3/Water Nanofluids
,” Appl. Therm. Eng.
, 108
, pp. 1095
–1104
. 9.
Kumar
, A.
, and Subudhi
, S.
, 2018
, “Preparation, Characteristics, Convection and Applications of Magnetic Nanofluids: A Review
,” Heat and Mass Transfer
, 54
(2
), pp. 241
–265
. 10.
Sundar
, L. S.
, and Sharma
, K. V.
, 2010
, “Heat Transfer Enhancements of Low Volume Concentration Al2O3 Nanofluid and With Longitudinal Strip Inserts in a Circular Tube
,” Int. J. Heat Mass Transfer
, 53
(19–20
), pp. 4280
–4286
. 11.
Sundar
, S.
, Ravi Kumar
, L.
, Naik
, N. T.
, and Sharma
, M. T.
, and V
, K.
, 2012
, “Effect of Full Length Twisted Tape Inserts on Heat Transfer and Friction Factor Enhancement with Fe3O4 Magnetic Nanofluid Inside a Plain Tube: An Experimental Study
,” Int. J. Heat Mass Transfer
, 55
(11–12
), pp. 2761
–2768
. 12.
Sundar
, L. S.
, and Sharma
, K. V.
, 2010
, “Turbulent Heat Transfer and Friction Factor of Al2O3 Nanofluid in Circular Tube With Twisted Tape Inserts
,” Int. J. Heat Mass Transfer
, 53
(7–8
), pp. 1409
–1416
. 13.
Talesh Bahrami
, H. R.
, Aminian
, E.
, and Saffari
, H.
, 2020
, “Energy Transfer Enhancement Inside an Annulus Using Gradient Porous Ribs and Nanofluids
,” ASME J. Energy Resour. Technol.
, 142
(12
), p. 122012
. 14.
Sheikholeslami
, M.
, Arabkoohsar
, A.
, and Jafaryar
, M.
, 2020
, “Exhaust Heat Recovery Unit Equipped With Nanofluid and Helical Tapes, a Solution for Cleaner Energy Production
,” ASME J. Energy Resour. Technol.
, 142
(11
), p. 112111
. 15.
Khurana
, D.
, and Subudhi
, S.
, 2019
, “Forced Convection of Al2O3/Water Nanofluids With Simple and Modified Spiral Tape Inserts
,” Heat Mass Transfer
, 55
(10
), pp. 2831
–2843
. 16.
Bas
, H.
, and Ozceyhan
, V.
, 2012
, “Heat Transfer Enhancement in a Tube With Twisted Tape Inserts Placed Separately From the Tube Wall
,” Exp. Therm. Fluid Sci.
, 41
, pp. 51
–58
. 17.
Dittus
, F. W.
, and Boelter
, L. M. K.
, 1985
, “Heat Transfer in Automobile Radiators of the Tubular Type
,” Int. Commun. Heat Mass Transfer
, 12
(1
), pp. 3
–22
. 18.
Gnielinski
, V.
, 1975
, “New Equations for Heat and Mass Transfer in Turbulent Flow Through Pipes and Ducts
,” Forsch. Ingenieurwes.
, 41
(1
), pp. 8
–16
. 19.
Petukhov
, B. S.
, 1970
, “Heat Transfer and Friction in Turbulent Pipe Flow With Variable Physical Properties
,” Adv. Heat Transfer
, 6
, pp. 503
–564
. 20.
Eiamsa-ard
, S.
, Thianpong
, C.
, and Eiamsa-ard
, P.
, 2010
, “Turbulent Heat Transfer Enhancement by Counter/Co-swirling Flow in a Tube Fitted With Twin Twisted Tapes
,” Exp. Therm. Fluid Sci.
, 34
(1
), pp. 53
–62
. 21.
Murugesan
, P.
, Mayilsamy
, K.
, and Suresh
, S.
, 2010
, “Turbulent Heat Transfer and Pressure Drop in Tube Fitted With Square-Cut Twisted Tape
,” Chin. J. Chem. Eng.
, 18
(4
), pp. 609
–617
. 22.
Manglik
, R. M.
, and Bergles
, A. E.
, 1993
, “Heat Transfer and Pressure Drop Correlations for Twisted-Tape Inserts in Isothermal Tubes: Part II—Transition and Turbulent Flows
,” ASME J. Heat Transfer-Trans. ASME
, 115
(4
), pp. 890
–896
. 23.
Liebenberg
, H. C. L.
, Vyvef
, H.
, and Meyera
, J. P.
, 2003
, “Angled Spiralling Tape Inserts in a Heat Exchanger Annulus
,” R&D J.
, 19
(2
), pp. 1
–8
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