Numerical investigation of heat transfer rate around isothermal elliptical cylinder under pulsating flow

Authors

1 M.s. Student, Mech. Eng., Shiraz University of Technology, Shiraz, Iran.

2 Assis. Prof., Mech. Eng., Shiraz University of Technology, Shiraz, Iran.

Abstract

In this study, the effects of frequency and dimensionless amplitude of the pulsating flow on the rate of heat transfer around elliptical cylinders with elliptical ratio of e=0.2 and 0.6 under different angles θ=0°, 30°, 60° and 90° and also for elliptical ratio of e=1 (circular cylinder) has been investigated. For this purpose, the flow around a cylinder with elliptical ratio of e=1 under pulsating and unpulsating flow been solved and then the results of elliptical cylinder under different angles of attack and elliptical ratio compared. So, pulsating flow over the cylinder, in the range of pulsating Strouhal number St=(0.1-2) and dimensionless amplitude of pulsating flow A=0.75 in Reynolds number of Re=100 has been studied. In all cases, elliptical cylinder have fixed temperature more than the temperature of the surrounding fluid. The pulsating flow is a factor that can be effective on the rate of heat transfer, according to results presented in this study, pulsating flow over elliptical cylinder, in some cases can increase the heat transfer rate. But in general, changes in the rate of heat transfer depend on the frequency and dimensionless amplitude of pulsating flow.

Keywords

Main Subjects

References

[1]  Chang TB, WY Yeh (2011) Theoretical investigation into condensation heat transfer on horizontal elliptical tube in stationary saturated vapor with wall suction. Appl Therm Eng 31(5):  946-953.
[2]  Sahim K, Santoso D (2013) Convective heat transfer from a heated elliptic cylinder at uniform wall temperature. IJEEE 4(1): 133-140.
[3]  Abbassi A, Taheri HA (2005) Numerical analysis of unsteady-state laminar forced convection over an inclined, horizontal cylinder at constant heat flux. 16th international symposium on transport phenomena.
[4]  Abd-Rabbo MA, Berbish NS, Mohammad MA, Mandour MM (2013) Forced convection heat transfer from three dimensional bodies in cross-flow. Engineering Research Journal, Helwan University 137: M1-M19.
[5] Abbassi A, Taheri HA (2010) Numerical solution of laminar forced convection flow around an angled horizontal elliptical cylinder and the impact of alternative vortices.
[6]  Abdel Aziz AA, Abdalla NSB, Hanafi S (2006) Flow and heat transfer characteristics around a combination of elliptic cylinders in-line Eighth International Congress of Fluid Dynamics & Propulsion.
[7]  Lugt HJ, Haussling HJ (1972) Laminar flows past elliptic cylinders at various angles of attack.  DTIC Document.
[8]  Lotfi B, et al (2014) 3D numerical investigation of flow and heat transfer characteristics in smooth wavy fin-and-elliptical tube heat exchangers using new type vortex generators. Energy 73: 233-257.
[9]  Taler D, Oclen P (2014) Determination of heat transfer formulas for gas flow in fin-and-tube heat exchanger with oval tubes using CFD simulations. Chem Eng.Proces 83: 1-11.
[10] Hamid MO, Zhang B, Yang L (2014)  Application of field synergy principle for optimization fluid flow and convective heat transfer in a tube bundle of a pre-heater. Energy 76: 241-253.
[11] Ranut P, et al (2014) Multi-objective shape optimization of a tube bundle in cross-flow. Int J Heat Mass Transf 68: 585-598.
[12] Khan MG, Fartaj A, Ting DSK (2004) An experimental characterization of cross-flow cooling of air via an in-line elliptical tube array. Int J Heat Fluid Flow 25(4): 636-648.
[13] Ibrahim TA, Gomaa A (2009) Thermal performance criteria of elliptic tube bundle in crossflow. Int J Therm Sci 48(11): 2148-2158.
[14] Al-Sumaily GF, Thompson MC (2013) Forced convection from a circular cylinder in pulsating flow with and without the presence of porous media. Int J Heat Mass 61: 226-244.
[15] Al-Sumaily GF, Sheridan J, Thompson MC (2013) Validation of thermal equilibrium assumption in forced convection steady and pulsatile flows over a cylinder embedded in a porous channel. Int Commun Heat Mass Transf 43: 30-38.
[16] Selimefendigil F, Föller S, Polifke W (2012) Nonlinear identification of unsteady heat transfer of a cylinder in pulsating cross flow. Comput Fluids 53: 14-1.
[17] Selimefendigil F, Öztop HF (2013) Identification of forced convection in pulsating flow at a backward facing step with a stationary cylinder subjected to nanofluid. Int Commun Heat Mass Transf 45: 111-121.
[18] Selimefendigil F, Öztop HF (2014) Numerical study and identification of cooling of heated blocks in pulsating channel flow with a rotating cylinder. Int J Therm Sci 79: 132-145.
[19] Huang Z, Zhang W, Xi G (2015) Natural convection in square enclosure induced by inner circular cylinder with time-periodic pulsating temperature. Int J Heat Mass 82: 16-25.
[20] Sung HJ, Hwang KS, Hyun JM (1994) Experimental study on mass transfer from a circular cylinder in pulsating flow. Int J Heat Mass 37(15): 2203-2210.
[21] Perwaiz J, Base T (1992) Heat transfer from a cylinder and finned tube in a pulsating crossflow. Exp Therm Fluid Sci 5(4): 506-512.
[22] Ji TH, Kim SY, Hyun JM (2008) Experiments on heat transfer enhancement from a heated square cylinder in a pulsating channel flow. Int J Heat Mass 51(5): 1130-1138.
[23] Iwai H, et al (2004) Laminar convective heat transfer from a circular cylinder exposed to a low frequency zero-mean velocity oscillating flow. Int J Heat Mass 47(21): 4659-4672.
[24] Steggel N (1998) A numerical investigation of the flow around rectangular cylinders. University of Surrey.
[25] Bouris DEK (2011) Numerical study of fluid forces and vortex patterns in the wake of a circular cylinder subject to harmonic and non‐harmonic inflow velocity perturbations. IUTAM Symposium on Bluff Body Flows.
[26] Lin YC, et al (2006) Pulsatile flow past a cylinder: An experimental model of flow in an artificial lung. ASAIO J 52(6): 614-623.
[27] Lin Y, et al (2008) Pulsatile flow past multiple cylinders: A model study of blood flow in an artificial lung. in 4th Kuala Lumpur International Conference on Biomedical Engineering 2008. Springer.
[28] Zdravkovich M (1988) Review of interference-induced oscillations in flow past two parallel circular cylinders in various arrangements. J Wind Eng Ind Aerodyn 28(1): 183-199.
[29] Konstantinidis E, et al (2000) On the flow and vortex shedding characteristics of an in-line tube bundle in steady and pulsating crossflow. Chem Eng Res Des 78(8): 1129-1138.
[30] Konstantinidis E, Balabani S, Yianneskis M (2002) A study of vortex shedding in a staggered tube array for steady and pulsating cross-flow. J Fluids Eng Trans ASME 124(3): 737-746.
[31] Konstantinidis E, Castiglia D, Balabani S (2005) An experimental study of steady and pulsating cross-flow over a semi-staggered tube bundle. Proc Inst Mech Eng Part C J Mech Eng Sci 219(3): 283-298.
[32] Liang C, Papadakis G, Luo X (2009) Effect of tube spacing on the vortex shedding characteristics of laminar flow past an inline tube array: a numerical study. Comput Fluids 38(4): 950-964.
[33] Konstantinidis E, Balabani S, Yianneskis M (2003) Relationship between vortex shedding lock-on and heat transfer: Implications for tube bundles in cross-flow. Chem Eng Res Des 81(6): 695-699.
[34] Khaibullina A, et al (2014) Heat transfer at in-line tube bank under low-frequency asymmetrical impulses impact on fluid flow. in EPJ Web of Conferences. EDP Sciences.
[35] Mulcahey T, Pathak M, Ghiaasiaan S (2013) The effect of flow pulsation on drag and heat transfer in an array of heated square cylinders. Int J Therm Sci 64: 105-120.
[36] Liang C (2005) Large eddy simulation of the turbulent flow and heat transfer in tube bundles. University of London.
[37] Srinivasan K (2005) On a separation criterion for symmetric elliptic bluff body flows. arXiv preprint physics/0511250.
[38] Jiji LM, Jiji LM (2006) Heat convection. Springer.
[39] Incropera F, DeWitt D (2002) Fundamentals of heat and mass transfer. 5th edn. John Wiley & Sons, New York.
[40] Bharti R, Sivakumar P, Chhabra R (2008) Forced convection heat transfer from an elliptical cylinder to power-law fluids. Int J Heat Mass 51(7): 1838-1853.
[41] D'Alessio SJD, Dennis SCR (1995) Steady laminar forced convection from an elliptic cylinder. J Eng Math 29(2): 181-193.
Journal of Solid and Fluid Mechanics
Volume 8, Issue 2
July 2018
Pages 161-176

Files

Share

How to cite

Statistics