Second law analysis for free convection in non-newtonian fluids over a horizontal plate embedded in a porous medium: (prescribed heat flux)

Khan, Waqar A.; Gorla, Rama Subba Reddy

doi:10.1590/s0104-66322012000300008

Cited by 5 publications

(4 citation statements)

References 7 publications

(4 reference statements)

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“… 10 , Qasim 11 and Noor 12 . Also, of considerable interest for the present paper are the book by Bejan 13 , and the papers by Bejan 14 , and Khan and Gorla 15 . It should also be mentioned that the Bejan number was highlighted as a useful number for the topic of entropy generation analysis for non-Newtonian fluid (see Yazdi et al .…”

mentioning

confidence: 92%

Unsteady stagnation-point flow and heat transfer of a special third grade fluid past a permeable stretching/shrinking sheet

Naganthran

Nazar

Pop

2016

Sci Rep

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In this paper, the unsteady stagnation-point boundary layer flow and heat transfer of a special third grade fluid past a permeable stretching/shrinking sheet has been studied. Similarity transformation is used to transform the system of boundary layer equations which is in the form of partial differential equations into a system of ordinary differential equations. The system of similarity equations is then reduced to a system of first order differential equations and has been solved numerically by using the bvp4c function in Matlab. The numerical solutions for the skin friction coefficient and heat transfer coefficient as well as the velocity and temperature profiles are presented in the forms of tables and graphs. Dual solutions exist for both cases of stretching and shrinking sheet. Stability analysis is performed to determine which solution is stable and valid physically. Results from the stability analysis depict that the first solution (upper branch) is stable and physically realizable, while the second solution (lower branch) is unstable.

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mentioning

confidence: 92%

Unsteady stagnation-point flow and heat transfer of a special third grade fluid past a permeable stretching/shrinking sheet

Naganthran

Nazar

Pop

2016

Sci Rep

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“…Bejan proposed entropy generation minimization (EGM) method to determine the optimal system design characteristics [14,15], and serves as an effective approach. Khan and Gorla [16] analyzed the exergetic features of heat transfer and fluid flow of natural convection with non-Newtonian fluids over a horizontal plate of a given surface in a porous medium. Oliveski et al [17] presented a numerical analysis on entropy generation of natural convection in rectangular cavities, where results indicated that the total entropy generation in steady state increase linearly with the aspect ratio and the irreversibility coefficient, and exponentially with the Rayleigh number.…”

Section: Introductionmentioning

confidence: 99%

Second Law Analysis for Free Convection in an L-Shaped Cavity Filled with Nanofluid

Nahar,

Salma Parvin,

Md. Hasanuzzaman

2023

AJSE

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The paper aims to analyze the effects of various Prandtl number and different nanoparticles for heat transfer and entropy generation of free convection laminar fluid flow in an L-shaped cavity filled by nanofluid. To investigate the second law characteristics of free convective flow and heat transfer from an L- shaped geometry filled by water and nanofluids (Cu-water, Ag-water, Al2O3-water), the effects of Prandtl number and various nanoparticles on the average Nusselt number, total entropy generation and Bejan number has been numerically analyzed. Isotherms, stream function and entropy generation caused by heat transfer are also presented for various Prandtl numbers and various nanoparticles. The governing equations are solved using penalty finite element method with Galerkins weighted residual technique. The results reveal that Ag-water nanofluid with highest Prandtl number gives the highest amount of irreversibility as well as rate of heat transfer. Cu-water and Ag-water nanofluid produces more irreversibilities than Al2O3-water nanofluid and base fluid. Also the results show that the Nusselt number and Bejan number increase with the increase of Prandtl number. Therefore, Prandtl number may be an important parameter for desired heat transfer increment with decreasing entropy generation in the given geometry.

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“…Zehtabiyan-Rezaie et al (2017) performed a numerical study of heat transfer enhancement and entropy generation in the flow inside open cavities in the presence of inclined magnetic fields. Khan and Gorla (2012) presented the second law analysis of heat transfer and fluid flow due to free convection over a horizontal plate with prescribed surface heat flux. Shuja et al (2008) studied flow over a porous block inside a channel and numerically studied the effects of channel inlet port height, porosity, and block aspect ratio on entropy generation.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Thermal Decomposition in an Open Cavity: Entropy Analysis

Ovando-Chacon

Ovando-Chacón

Prince-Avelino

et al. 2019

Braz. J. Chem. Eng.

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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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Second law analysis for free convection in non-newtonian fluids over a horizontal plate embedded in a porous medium: (prescribed heat flux)

Cited by 5 publications

References 7 publications

Unsteady stagnation-point flow and heat transfer of a special third grade fluid past a permeable stretching/shrinking sheet

Unsteady stagnation-point flow and heat transfer of a special third grade fluid past a permeable stretching/shrinking sheet

Second Law Analysis for Free Convection in an L-Shaped Cavity Filled with Nanofluid

Simulation of Thermal Decomposition in an Open Cavity: Entropy Analysis

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