Experimental Investigation into Natural Convection Heat Transfer inside Triangular Enclosure with Internal Hot Cylinder
DOI:
https://doi.org/10.29194/NJES.26030175Keywords:
Laminar Flow, Natural Convection, Triangular Enclosure, Inclination Angle, Circular CylinderAbstract
Natural convection air heat transfer and fluid movement currents around a hot circular cylinder inside an inclined triangular enclosure has been analyzed experimentally. Three different sizes of an enclosure with a long side of 20, 25, and 30 cm, the thickness of 1 mm, and depth of 50 cm were used in the present work to give three radius ratios. The effect of Rayleigh number, radius ratio, the rotation angle of triangle enclosure, and the inclination angle of the apparatus with horizontal axis ? on the heat transfer process was investigated. The ranges of these parameters were: Rayleigh number from 5×106 to 2.5×108, radius ratio (0.345, 0.455, and 0.618), rotation angle (0o, 45o, and 90o), and inclination angle (0o, 45o and 90o). The results show that the heat transfer rates increase with increase in Rayleigh number and as the rotation angle of enclosure is changed from 0o to 90o. Moreover, the heat transfer rate increases linearly with Rayleigh number at higher radius at rotation angle 0o, 90o only. While, it increases slightly with Rayleigh number at rotation angle 45o. Additionally, the higher heat transfer rates occur at vertical position of enclosure inclination angle 90o and rotation angle 0o (the base of triangle at the bottom) and it decreases as inclination angle deviates from 90o to 0o. This behavior is reverse completely at higher radius ratio 0.618. Empirical correlations for the average Nusselt number has been found to depend on Rayleigh number., radius ratio, rotation angle and inclination angle.
Downloads
References
M. Sheikholeslami, M. Hatami, M. Jafaryar, F. Farkhadnia, D. D. Ganji, and M. Gorji-Bandpy, “Thermal management of double-pipe air to water heat exchanger,” Energy Build., vol. 88, pp. 361–366,2015. https://doi.org/10.1016/j.enbuild.2014.11.076
G. Barakos, E. Mitsoulis, and D. Assimacopou-los, “Natural convection flow in a square cavity re-visited: Laminar and turbulent models with wall functions,” Int. J. Numer. Methods Fluids, vol. 18, no. 7, pp. 695–719, 1994. https://doi.org/10.1002/fld.1650180705
E. Abu-Nada and H. F. Oztop, “Effects of incli-nation angle on natural convection in enclosures filled with Cu-water nanofluid,” Int. J. Heat Fluid Flow, vol. 30, no. 4, pp. 669–678, 2009. https://doi.org/10.1016/j.ijheatfluidflow.2009.02.001
Y. Varol, H. F. Oztop, A. Koca, and F. Ozgen, “Natural convection and fluid flow in inclined en-closure with a corner heater,” Appl. Therm. Eng., vol. 29, no. 2–3, pp. 340–350, 2009. https://doi.org/10.1016/j.applthermaleng.2008.02.033
Al-Jabair, Sattar, and Laith J. Habeeb. "Simulation of Natural Convection in Concentric Annuli be-tween an Outer Inclined Square Enclosure and an Inner Horizontal Cylinder." World Academy of Science, Engineering and Technology 69: 398-406,2012?. https://doi.org/10.5281/zenodo.1327837
R. M. Fand, E. W. Morris, and M. Lum, “Natural convection heat transfer from horizontal cylinders to air, water and silicone oils for Rayleigh numbers between 300 and 200,” Int. J. Heat Mass Transf., vol. 20, pp. 1173–1184, 1977.
H. Yao, “Studies of Natural Convection in Enclo-sures Using the Finite Volume Method,” vol. M, 2000.
Flack, R. D., T. T. Konopnicki, and J. H. Rooke. "The measurement of natural convective heat transfer in triangular enclosures."), 648-654.? 1979
https://doi.org/10.1115/1.3451051
R.D. Flack “Heat transfer in triangular enclosures”, ASME J. Heat Transfer 101 (1979) 648–654.
R.D. Flack, The experimental measurement of natural convection heat transfer in triangular en-closures heated or cooled from below, ASME J. Heat Transfer 102, 770–772,1980.
https://doi.org/10.1115/1.3244389
V.A. Akinsete, T.A. Coleman, Heat transfer by steady laminar free convection in triangular enclo-sures, Int. J. Heat Mass Transfer Vol.25, No.7 991–998, 1982. https://doi.org/10.1016/0017-9310(82)90074-6
D. Poulikakos, A. Bejan, Natural convection ex-periments in a triangular enclosure, ASME J. Heat Transfer 105 652–655, 1983. https://doi.org/10.1115/1.3245635
Campo, Ernesto Martín del, Mihir Sen, and Edu-ardo Ramos. "Analysis of laminar natural convec-tion in a triangular enclosure." Numerical Heat Transfer, Part A Applications Vol.13, No 3 353-372,1988. .? https://doi.org/10.1080/10407788808913618
Flack, Ronald D., Klaus Brun, and Rita J. Schnip-ke. "Measurement and prediction of natural con-vection velocities in triangular enclosures." Inter-national journal of heat and fluid flow Vol.16, No.2,106-113, 1995. https://doi.org/10.1016/0142-727X(94)00001-S?
Salmun, Haydee. "Convection patterns in a trian-gular domain." International Journal of Heat and Mass Transfer, Vol 38, No.2 , 351-362, 1995.? https://doi.org/10.1016/0017-9310(95)90029-2
Salmun, Haydee. "The stability of a single-cell steady-state solution in a triangular enclosure." In-ternational journal of heat and mass transfer , Vol.38,No.2363-369,1995. https://doi.org/10.1016/0017-9310(95)90031-4
Holtzman, G. A., R. W. Hill, and K. S. Ball. "Lam-inar natural convection in isosceles triangular en-closures heated from below and symmetrically cooled from above." J. Heat Transfer, Vol. 122,No.3 , 485-491, 2000.? https://doi.org/10.1115/1.1288707
Y.S. Morsi, S. Das, Numerical investigation of natural convection inside complex enclosures, Heat Transfer Eng. 24 , 30–41,2003. https://doi.org/10.1080/01457630304080
E.H. Ridouane, A. Campo, “Experimental-based correlations for the characterization of free con-vection of air inside isosceles triangular cavities with variable apex angles”, Experimental Heat Transfer Vol.18, No.2 , 81-86, 2005. https://doi.org/10.1080/08916150590914723
E.H. Ridouane, A. Campo, J.Y. Chang, Natural convection patterns in rightangled triangular cavi-ties with heated vertical sides and cooled hypote-nuses, ASME J. Heat Transfer 127, 1181–1186, 2005. https://doi.org/10.1115/1.2033903
E.H. Ridouane, A. Campo, Formation of a pitch-fork bifurcation in thermal convection ?ow inside an isosceles triangular cavity, Physics of Fluids, Vol. 18, No.7 , 074102, 2006. https://doi.org/10.1063/1.2220051
Y. Varol, A. Koca, H.F. Oztop, Natural convec-tion in a triangle enclosure with ?ush mounted heater on the wall”, International Communica-tions in Heat and Mass Transfer, Vol.33,No.8,, 951-958, 2006. https://doi.org/10.1016/j.icheatmasstransfer.2006.05.003
A. Omri, M. Najjari, S.B. Nasrallah, Numerical analysis of natural buoyancyinduced regimes in isosceles triangular cavities”, Numerical Heat Transfer, Part A: Applications, Vol.52, No.7, 661-678,2007. https://doi.org/10.1080/10407780701339967
E. Fuad Kent, E. Asmaz, S. Ozerbay,” Laminar natural convection in right triangular enclosures”, Heat Mass Transfer ,Vol.44, 187–200,2007. https://doi.org/10.1007/s00231-007-0239-6
A. Koca, H.F. Oztop, Y. Varol, “The effects of Prandtl number on natural convection in triangu-lar enclosures with localized heating from below”, International communications in heat and mass transfer , Vol.34, No.4, 511-519,2007. https://doi.org/10.1016/j.icheatmasstransfer.2007.01.006
S. A. Nada, "Experimental investigation of natural convection heat transfer in horizontal and in-clined annular fluid layers." Heat and mass transfer Vol.44,No.8 929-936, 2008. https://doi.org/10.1007/s00231-007-0337-5
G. Yesiloz and O. Aydin, "Natural convection in an inclined quadrantal cavity heated and cooled on adjacent walls." Experimental Thermal and Fluid Science , Vol.35, No.6 , 1169-1176, 2011. https://doi.org/10.1016/j.expthermflusci.2011.04.002
R. M. Fand, E. W. Morris, and M. Lum, "Natural convection heat transfer from horizontal cylinders to air, water and silicone oils for Rayleigh numbers between 3× 102 and 2× 107." International Journal of Heat and Mass Transfer , Vol.20, No.11 , 1173-1184, 1977. https://doi.org/10.1016/0017-9310(77)90126-0
E. M. Sparrow and M. Charmcill, “Natural convec-tion experiments in an inclosure between eccentric or concentric vertical cylinders of different height and diameter,” vol. 26, no. I, pp. 133–143, 1983.https://doi.org/10.1016/S0017-9310(83)80015-5
F. A. W. Hamad, “Experimental study of natural convection heat transfer in inclined cylindrical an-nulus,” Solar & Wind Technol., vol. 6, pp. 573–579, 1989. https://doi.org/10.1016/0741-983X(89)90093-3
K. Kitamura, Kami-iwa, F., and T. Misumi, “Heat transfer and fluid flow of natural convection around large horizontal cylinders,” International Journal of Heat and Mass Transfer, vol. 42,No.22, pp. 4093–4106, 1999. https://doi.org/10.1016/S0017-9310(99)00079-4
Akeel Abdullah Mohammed, Hasan Shakir Majdi, Muwafaq Shyaa Alwan, “Effect of thermal con-ductivity of porous media on thermo-fluid fields of free convective flow around a circular cylinder inside a square cavity”, Journal of Mechanical En-gineering Research and Developments, Vol. 43, No.6, pp. 440-455, 2020.
Akeel Abdullah Mohammed, “Natural convection heat transfer inside horizontal circular enclosure with triangular cylinder at different angles of incli-nation”, Journal of Thermal Engineering, Vol. 7, No. 1, pp. 240-254, January, 2021. https://doi.org/10.18186/thermal.849812
Sattar Aljabair, Akeel Abdullah Mohammed, Israa Alesbe, “Natural convection heat transfer in cor-rugated annuli with H2O-Al2O3 nanofluid”, Heli-yon 6 (2020) e05568. https://doi.org/10.1016/j.heliyon.2020.e05568
Hasan Shakir MAJDI, Akeel Abdullah Moham-med, Amer Abdullah Mohammed, Laith Jaafer Habeeb. “Effect of fibrous porous material on natural convection heat transfer from a horizontal circular cylinder located in a square enclosure”, Journal of Thermal Engineering, Vol. 7, No. 6, pp. 1468–1478, September, 2021. https://doi.org/10.18186/thermal.990865.
Downloads
Published
Issue
Section
License
Copyright (c) 2023 Akeel Abdullah Mohammed, Ansam Adil Mohammed, Shylesha V. Channapattanac
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
The authors retain the copyright of their manuscript by submitting the work to this journal, and all open access articles are distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International (CC-BY-NC 4.0), which permits use for any non-commercial purpose, distribution, and reproduction in any medium, provided that the original work is properly cited.
