Abstract:-Natural convection in superimposed layers of fluids heated from below is commonly observed in many industrial and natural situations, such as crystal growth, co-extrusion processes and atmospheric flow. The stability analysis of this system reveals a complex dynamic behavior, including the potential multiplicity of stationary states and occurrence of periodic regimes. In this study, a linear stability analysis (LSA) was performed to determine the onset of natural convection as a function of imposed boundary c… Show more
“…Rahman et al (2013) carried out an investigation of a two-dimensional laminar incompressible mixed convection flow in a ventilated cavity. Fontana et al (2016) carried out a comparison between linear stability analysis and numerical simulation of Rayleigh-Benard convection in double-layer channel flow. Dhiman et al (2012) analyzed the effects of blockage ratio on the cross-buoyancy around a confined square cylinder in a channel.…”
This paper presents a numerical analysis of entropy generation in a two-dimensional rectangular channel where the inlet flow undergoes thermal decomposition resulting from a chemical reaction. The model considered viscosity and thermal conductivity to be dependent of temperature. Irreversibility due to mass transport was included in the entropy generation analysis. Relevant applications of this study are possible for the design of power generation systems and reactors. The effects of the Reynolds number, Schmidt number, and length of the heat source on thermal fluid dynamics, mass transfer, and irreversibility were also investigated. It was found that thermal decomposition increases at: a) low Reynolds numbers, b) low Schmidt numbers, and c) increased length of heat source. Additionally, overall entropy generation increased when Reynolds number and length of heat source were increased, although in all cases, overall irreversibility attains a minimum value at a specific Schmidt number.
“…Rahman et al (2013) carried out an investigation of a two-dimensional laminar incompressible mixed convection flow in a ventilated cavity. Fontana et al (2016) carried out a comparison between linear stability analysis and numerical simulation of Rayleigh-Benard convection in double-layer channel flow. Dhiman et al (2012) analyzed the effects of blockage ratio on the cross-buoyancy around a confined square cylinder in a channel.…”
This paper presents a numerical analysis of entropy generation in a two-dimensional rectangular channel where the inlet flow undergoes thermal decomposition resulting from a chemical reaction. The model considered viscosity and thermal conductivity to be dependent of temperature. Irreversibility due to mass transport was included in the entropy generation analysis. Relevant applications of this study are possible for the design of power generation systems and reactors. The effects of the Reynolds number, Schmidt number, and length of the heat source on thermal fluid dynamics, mass transfer, and irreversibility were also investigated. It was found that thermal decomposition increases at: a) low Reynolds numbers, b) low Schmidt numbers, and c) increased length of heat source. Additionally, overall entropy generation increased when Reynolds number and length of heat source were increased, although in all cases, overall irreversibility attains a minimum value at a specific Schmidt number.
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