This research deals with the study of the irreversibility of three-dimensional mixed convection flow in an inclined duct with step. To reach this goal, an analysis of entropy generation is carried out according to the second law of thermodynamics. The effects of buoyancy force on the flow irreversibility are analyzed with all details. The results show that the values of entropy generation number and Bejan number are intensively dependent on the Grashof number and duct inclination angle, so that the effects of Grashof number on the mentioned parameters are much higher for the vertical ducts.
Abu-Nada E. Entropy generation due to heat and fluid flow in backward facing step flow with various expansion ratios. International Journal of Exergy. 2006;419–35.
2.
Abu-Nada E. Investigation of entropy generation over a backward facing step under bleeding conditions. Energy Conversion and Management. 2008;3237–42.
3.
Aghaei A, Khorasanizadeh H, Sheikhzadeh G, Abbaszadeh M. Numerical study of magnetic field on mixed convection and entropy generation of nanofluid in a trapezoidal enclosure. Journal of Magnetism and Magnetic Materials. 2016;133–45.
4.
Atashafrooz M, Nassab G, Ansari S, A. Numerical study of entropy generation in laminar forced convection flow over inclined backward and forward facing steps in a duct. International Review of Mechanical Engineering. 2011;(5):898–907.
5.
Atashafrooz M, Nassab G, S. Simulation of three-dimensional laminar forced convection flow of a radiating gas over an inclined backward-facing step in a duct under bleeding condition. Institution of Mechanical Engineers, Part C. Journal of Mechanical Engineering Science. 2012;(2):332–45.
6.
Atashafrooz M, Nassab G, Ansari S, A. Numerical investigation of entropy generation in laminar forced convection flow over inclined backward and forward facing steps in a duct under bleeding condition. Thermal Science. 2014;(2):479–92.
7.
Atashafrooz M, Nassab G, S, Lari. Application of full-spectrum kdistribution method to combined non-gray radiation and forced convection flow in a duct with an expansion. Journal of Mechanical Science and Technology. 2015;(2):845–59.
8.
Bahaidarah H, Sahin A. Thermodynamic analysis of fluid flow in channels with wavy sinusoidal walls. Thermal Science. 2013;(3):813–22.
9.
Bejan A. Entropy generation through heat and fluid flow. Canada: John Wiley & Sons Inc. 1994;
10.
Bejan A. Entropy generation minimization. Boca Raton, New York, USA: CRC Press. 1996;
11.
Chen Y, Nie J, Hsieh H, Sun L. Three-dimensional convection flow adjacent to inclined backward-facing step. International Journal of Heat and Mass Transfer. 2006;4795–803.
12.
Dagtekin I, Oztop H, Bahloul A. Entropy generation for natural convection in Γ-shaped enclosures. International Communications in Heat and Mass Transfer. 2007;(4):502–10.
13.
Berrin Erbay L, Altaç Z, Sülüş B. Entropy generation in a square enclosure with partial heating from a vertical lateral wall. Heat and Mass Transfer. 2004;40(12):909–18.
14.
Iwai H, Nakabe K, Suzuki K, Matsubara K. The effects of duct inclination angle on laminar mixed convective flows over a backward-facing step. International Journal of Heat and Mass Transfer. 2000;473–85.
15.
Kooshki M, Nassab G, Ansari S, A. Investigation of entropy generation in 3-d laminar forced convection flow over a backward facing step with bleeding. International Journal of Engineering-Transactions A: Basics. 2012;(4):379–88.
16.
Mamourian M, Shirvan K, Ellahi R, Rahimi A. Optimization of mixed convection heat transfer with entropy generation in a wavy surface square lid-driven cavity by means of Taguchi approach. International Journal of Heat and Mass Transfer. 2016;544–54.
17.
Mohaghegh M, Esfahani J. Entropy generation analysis of free convection from a constant temperature vertical plate using similarity solution. Thermal Science. 2016;(6):1855–66.
18.
Mohammed H, Alawi O, Wahid M. Mixed convective nanofluid flow in a channel having backward-facing step with a baffle. Powder Technology. 2015;329–43.
19.
Nassab S, Bahrami A, Keshtkar M, Saffaripour M. Comparison between two methods for enhancing heat transfer in separated convection flows-second law analysis. Transactions of Mechanical Engineering. 2014;(1):9–23.
20.
Nie J, Chen Y, Hsieh H. Effects of a baffle on separated convection flow adjacent to backward-facing step. International Journal of Thermal Sciences. 2009;618–25.
21.
Oztop H, Kolsi L, Alghamdi A, Abu-Hamdeh N, Borjini M, Aissia H. Numerical analysis of entropy generation due to natural convection in three-dimensional partially open enclosures. Journal of the Taiwan Institute of Chemical Engineers. 2017;131–40.
22.
Patankar S, Spalding D. A calculation procedure for heat, mass and momentum transfer in three-dimensional parabolic flows. International Journal of Heat and Mass Transfer. 1972;(10):1787–806.
23.
Selimefendigil F, Oztop H. Numerical analysis of laminar pulsating flow at a backward facing step with an upper wall mounted adiabatic thin fin. Computers & Fluids. 2013;93–107.
24.
Selimefendigil F, Öztop H. Influence of inclination angle of magnetic field on mixed convection of nanofluid flow over a backward facing step and entropy generation. Advanced Powder Technology. 2015;(6):1663–75.
25.
Selimefendigil F, Öztop HF. Numerical Study of Forced Convection of Nanofluid Flow Over a Backward Facing Step With a Corrugated Bottom Wall in the Presence of Different Shaped Obstacles. Heat Transfer Engineering. 2016;37(15):1280–92.
26.
Uruba V, Jona´s P, Mazur O. Control of a channel-flow behind a backward-facing step by suction/blowing. International Journal of Heat and Fluid Flow. 2007;665–72.
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