Transient cooling of two circular cylinders arranged in Tandem and bounded by an adiabatic wall

Nawaf Hazim Saeid; N. Hasan; Seri Rahayu Ya'akob; S. Shuib

doi:10.15282/jmes.15.4.2021.10.0676

Authors

N.H. Saeid Faculty of Engineering, Universiti Teknologi Brunei, Jalan Tungku Link, Gadong BE 1410, Brunei Darussalam. Phone: +0673- 2461020
N. Hasan Faculty of Engineering, Universiti Teknologi Brunei, Jalan Tungku Link, Gadong BE 1410, Brunei Darussalam. Phone: +0673- 2461020
Seri Rahayu Ya'akob Faculty of Engineering, Universiti Teknologi Brunei, Jalan Tungku Link, Gadong BE 1410, Brunei Darussalam. Phone: +0673- 2461020
S. Shuib Faculty of Mechanical Engineering, Universiti Teknologi Mara, Shah Alam, Selangor, Malaysia

DOI:

https://doi.org/10.15282/jmes.15.4.2021.10.0676

Keywords:

Conjugate heat transfer, transient analysis, circular cylinders, Tandem arrangement, thermal inertia, CFD simulations

Abstract

Parametric study is carried out on the transient cooling process of two circular cylinders in tandem arrangement for a specified period of time. Transient analysis of conjugate (conduction and convection) heat dissipation from two identical cylinders is considered with various parameters. The two cylinders of same size and properties are bounded by an adiabatic flat wall from below and the cooling air is flowing normal to their axis (cross flow). The following parameters are investigated in the present study: Reynolds number, cylinders thermal properties, separation distance between the two cylinders and the cooling time. The laminar flow is considered with Reynolds number values from 50 to 500. The simulations are carried out for cooling the two cylinders made of carbon steels, plastics plexiglass and plywood. The local and average Nusselt number for both steady and transient cooling of the two cylinders are presented. The effects of the parameters are investigated and the results are presented to understand the process. It is found that increasing either the separation distance and/or the Reynolds number will increase the heat dissipation and reduce the cooling time. The results show that carbon steels cylinders need longer time of cooling compare with the plywood cylinders due to the difference in their thermal inertia.

References

D. Sumner, "Two circular cylinders in cross-flow: a review", Journal of Fluids and Structures, vol. 26, pp. 849–899, 2010. doi.org/10.1016/j.jfluidstructs.2010.07.001.

A. Harichandan, and A. Roy, "Numerical investigation of flow past a single and tandem cylindrical bodies in the vicinity of a plane wall", Journal of Fluids and Structures, vol. 33, pp. 19–43, 2012.doi: 10.1016/j.jfluidstructs.2012.04.006.

R.J. Jiang, and J.Z. Lin, "Wall effects on flows past two tandem cylinders of different diameters", Journal of Hydrodynamics, vol. 24, pp. 1-10, 2012. doi: 10.1016/s1001-6058(11)60212-6.

B. Dehkordi, H. Moghaddam, and H. Jafari, "Numerical simulation of flow over two circular cylinders in tandem arrangement", Journal of Hydrodynamics, vol. 23, pp. 114-126, 2011. doi.org/10.1016/S1001-6058(10)60095-9.

S. Sarkar, A. Dalal, and G. Biswas, "Mixed convective heat transfer from two identical square cylinders in cross flow at Re= 100", International Journal of Heat and Mass Transfer, vol. 53, pp. 2628-2642, 2010. doi.org/10.1016/j.ijheatmasstransfer.2010.02.053.

J. Lu, H. Han, and B. Shi, "A numerical study of fluid flow passes two heated/cooled square cylinders in a tandem arrangement via lattice Boltzmann method", International Journal of Heat and Mass Transfer, vol. 55, pp. 3909-3920, 2012. doi.org/10.1016/j.ijheatmasstransfer.2012.03.010.

D. Chatterjee, G. Biswas, and S. Amiroudine, "Mixed convection heat transfer from an in-line row of square cylinders in cross-flow at low Reynolds number", Numerical Heat Transfer (A), vol. 61, pp. 891–911, 2012. doi: 10.1080/10407782.2012.677326.

D. Chatterjee, and M. Raja, "Mixed convection heat transfer past in-line square cylinders in a vertical duct", Thermal Science, vol. 17, pp. 567–580, 2013. doi: 10.2298/TSCI101004199C.

Z. Huang, G. Xi, W. Zhang, and S. Wen, "Mixed convection heat transfer from confined tandem square cylinders in a horizontal channel", International Journal of Heat and Mass Transfer, vol. 66, pp. 625–631, 2013. doi.org/10.1016/j.ijheatmasstransfer.2013.07.075.

I. Harimi, and M. Saghafian, "Numerical simulation of fluid flow and forced convection heat transfer from tandem circular cylinders using overset grid method", Journal of Fluids and Structures, vol. 28, pp. 309–327, 2012. doi:10.1016/j.jfluidstructs.2011.12.006.

H. Laidoudi, and M. Bouzit, "Mixed convection heat transfer from confined tandem circular cylinders in cross-flow at low Reynolds number", Mechanika, vol. 23, pp. 522-527, 2017. doi.org/10.5755/j01.mech.23.4.15258.

H. Laidoudi, and O.D. Makinde, "Mixed convection heat transfer around a tandem circular cylinders in incompressible downward flow", Diffusion Foundations, vol. 16, pp. 12–20, 2018. doi:10.4028/www.scientific.net/DF.16.12.

G. Juncu, "A numerical study of momentum and forced convection heat transfer around two tandem circular cylinders at low Reynolds numbers. Part I: Momentum transfer", International Journal of Heat and Mass Transfer, vol. 50, pp. 3788–3798, 2007. doi:10.1016/j.ijheatmasstransfer.2007.02.020.

G. Juncu, "A numerical study of momentum and forced convection heat transfer around two tandem circular cylinders at low Reynolds numbers. Part II: Forced convection heat transfer", International Journal of Heat and Mass Transfer, vol. 50, pp. 3799–3808, 2007. doi:10.1016/j.ijheatmasstransfer.2007.02.021.

N. Mahir, and Z. Altaç, "Numerical investigation of convective heat transfer in unsteady flow past two cylinders in tandem arrangements", International Journal of Heat and Fluid Flow,; vol. 29, pp. 1309–1318, 2008. doi:10.1016/j.ijheatfluidflow.2008.05.001.

E. Salcedo, J. Cajas, C. Trevino, and L. Suastegui, "Numerical investigation of mixed convection heat transfer from two isothermal circular cylinders in tandem arrangement: buoyancy, spacing ratio, and confinement effects", Theoretical and Computational Fluid Dynamics, vol. 31, pp. 159–187, 2017. doi: 10.1007/s00162-016-0411-z.

N.H. Saeid, and B. Busahmin, "Transient cooling of a cylinder in cross flow bounded by an adiabatic wall", ASEAN Journal of Chemical Engineering, vol. 17, pp.17-26, 2017. doi: 10.22146/ajche.49552.

M.A. Martins, L.S. De Oliveira, J.A.O. Saraz, "Numerical study of apple cooling in tandem arrangement", Dyna Journal, vol. 166, pp. 158-165, 2011. ISSN 0012-7353.

Y.A. Cengel, and A.J. Ghajar, Heat and Mass Transfer: Fundamentals and Applications, 5th Edition, McGraw-Hill, New York, 2015.

FLUENT User's Guide, Fluent Inc., Centerra Resource Park, 10 Cavendish Court, Lebanon, NH 03766, 2006.

ANSYS FLUENT User's Guide, ANSYS Inc., Southpointe 275, Technology Drive Canonsburg, PA 15317, 2011.

N.H. Saeid, "Natural convection in a square cavity with discrete heating at the bottom with different fin shapes", Heat Transfer Engineering Journal, vol. 39, pp. 154-161, 2018. doi.org/10.1080/01457632.2017.1288053.

N.H. Saeid, "Numerical investigations of sand erosion in a choke valve", Journal of Mechanical Engineering and Sciences, vol. 12, pp. 3988-4000, 2018. doi.org/10.15282/jmes.12.4.2018.01.0347.

N.H. Saeid, B. Busahmin, and A. Khalid, "Mixed convection jet impingement cooling of a moving plate", Journal of Mechanical Engineering and Sciences, vol. 13, pp. 5528-5541, 2019. doi.org/10.15282/jmes.13.3.2019.20.0446.

J. Wang, R.L. Bras, G. Sivandran, and R.G. Knox, "A simple method for the estimation of thermal inertia", Geophysical Research Letters, vol. 37, pp. 1-5, 2010. doi.org/10.1029/2009GL041851.