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Articles de revues sur le sujet « Entropy Generation Rate »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 10 février 2022

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1

Al-Qahtani, H., and B. S. Yilbas. "Entropy generation rate during laser pulse heating: Effect of laser pulse parameters on entropy generation rate." Optics and Lasers in Engineering 46, no. 1 (2008): 27–33. http://dx.doi.org/10.1016/j.optlaseng.2007.08.005.

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Hari, Rakesh, and Chandrasekharan Muraleedharan. "Analysis of Effect of Heat Pipe Parameters in Minimising the Entropy Generation Rate." Journal of Thermodynamics 2016 (February 3, 2016): 1–8. http://dx.doi.org/10.1155/2016/1562145.

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Heat transfer and fluid flow in the heat pipe system result in thermodynamic irreversibility generating entropy. The minimum entropy generation principle can be used for optimum design of flat heat pipe. The objective of the present work is to minimise the total entropy generation rate as the objective function with different parameters of the flat heat pipe subjected to some constraints. These constraints constitute the limitations on the heat transport capacity of the heat pipe. This physical nonlinear programming problem with nonlinear constraints is solved using LINGO 15.0 software, which

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3

Sunar, Mehmet. "Entropy generation rate for a mechatronics system." International Journal of Exergy 22, no. 3 (2017): 205. http://dx.doi.org/10.1504/ijex.2017.083171.

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Sunar, Mehmet. "Entropy Generation Rate for a Mechatronics System." International Journal of Exergy 22, no. 1 (2017): 1. http://dx.doi.org/10.1504/ijex.2017.10003818.

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Gyftopoulos, E. P., and G. P. Beretta. "Entropy Generation Rate in a Chemically Reacting System." Journal of Energy Resources Technology 115, no. 3 (1993): 208–12. http://dx.doi.org/10.1115/1.2905995.

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For a nonchemical-equilibrium state of an isolated system A that has r constituents with initial amounts na = {n1a, n2a, …, nra}, and that is subject to τ chemical reaction mechanisms, temperature, pressure, and chemical potentials cannot be defined. As time evolves, the values of the amounts of constitutents vary according to the stoichiometric relations ni(t) = nia + Σj=1τ νi(j) εj(t), where νi(j) is the stoichiometric coefficient of the ith constituent in the j-reaction mechanism and εj(t) the reaction coordinate of the jth reaction at time t. For such a state, we approximate the values of

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Cuadras, Angel, Jiaqiang Yao, and Marcos Quilez. "Determination of LEDs degradation with entropy generation rate." Journal of Applied Physics 122, no. 14 (2017): 145702. http://dx.doi.org/10.1063/1.4996629.

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Zhou, Li, and Yang Liu. "Optimization of Horizontal Plate Fin Heat Sink in Natural Convection for Electronics Cooling by Simulated Annealing Algorithm." Advanced Materials Research 1022 (August 2014): 91–95. http://dx.doi.org/10.4028/www.scientific.net/amr.1022.91.

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In this study, the simulated annealing (SA) algorithm was adopted to optimize the geometry of horizontal plate fin heat sink by the extreme entransy dissipation principle. The alculation of the entransy dissipation rate was presented in detail. Using the entransy dissipation rate as the objective condition, the geometry optimization of the fin heat sink was conducted. To verify the results, the heat source temperature and the entropy generation rate were also calculated in the procedure. It is found that the entrasy dissipation rate, entropy generation and heat source temperature have the simi

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Liu, L. H., and S. X. Chu. "On the Entropy Generation Formula of Radiation Heat Transfer Processes." Journal of Heat Transfer 128, no. 5 (2005): 504–6. http://dx.doi.org/10.1115/1.2190695.

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Because thermal radiation is a long-range phenomenon, the local radiative heat flux is dependent on the temperature distribution of the entire enclosure under consideration and is not determined by the local temperature gradient. In the community of heat transfer, traditionally, the conduction-type formula of entropy generation rate is used to calculate the entropy generation rate of radiation heat transfer. In the present study, three counterexamples are considered. The discrete ordinates method is employed to solve the radiative transfer equation and then solve the radiative entropy generati

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Yang, Xinyu, Haijiang He, Jun Xu, Yikun Wei, and Hua Zhang. "Entropy Generation Rates in Two-Dimensional Rayleigh–Taylor Turbulence Mixing." Entropy 20, no. 10 (2018): 738. http://dx.doi.org/10.3390/e20100738.

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Entropy generation rates in two-dimensional Rayleigh–Taylor (RT) turbulence mixing are investigated by numerical calculation. We mainly focus on the behavior of thermal entropy generation and viscous entropy generation of global quantities with time evolution in Rayleigh–Taylor turbulence mixing. Our results mainly indicate that, with time evolution, the intense viscous entropy generation rate s u and the intense thermal entropy generation rate S θ occur in the large gradient of velocity and interfaces between hot and cold fluids in the RT mixing process. Furthermore, it is also noted that the

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Liu, Haidong, and Uichiro Narusawa. "Flow-Induced Endothelial Surface Reorganization and Minimization of Entropy Generation Rate." Journal of Biomechanical Engineering 126, no. 3 (2004): 346–50. http://dx.doi.org/10.1115/1.1762895.

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Effects of hydrodynamic shear on the shape of the endothelial surface are examined based on evaluations of the rate of entropy generation at the cell surface. A linear solution of the flow over a sinusoidally varying endothelial surface is used to evaluate the entropy generation rate on the cell surface for which measured cell dimensions are available. Both the local rate of entropy generation (equivalent to the rate of energy dissipation by viscous shear) at the peak of a cell and the total entropy generation rate over the cell surface are minimized under conditions of a constant cell surface

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Walsh, E., and D. Hernon. "Unsteady Volumetric Entropy Generation Rate in Laminar Boundary Layers." Entropy 8, no. 1 (2006): 25–30. http://dx.doi.org/10.3390/e8010025.

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Sever, Michael. "The rate of total entropy generation for Riemann problems." Journal of Differential Equations 87, no. 1 (1990): 115–43. http://dx.doi.org/10.1016/0022-0396(90)90019-l.

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Vartolomei, Haralambie Mihail. "Theoretical Analysis of the Entropy Flow Generated by the Fluid Flow with Friction and Heat Exchange." Applied Mechanics and Materials 659 (October 2014): 499–502. http://dx.doi.org/10.4028/www.scientific.net/amm.659.499.

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Generating entropy is a measure of the irreversibility of a system or of its component. Any measure for minimizing the generation rate of entropy in a component of a system leads to reducing the irreversibility of the system’s assembly. We are interested into the entropy generation minimization procedure, which is the basis of the thermodynamic design.

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Mansoor, Saad Bin, and Bekir S. Yilbas. "Estimating Entropy Generation Rate for Ballistic-Diffusive Phonon Transport Using Effective Thermal Conductivity." Journal of Non-Equilibrium Thermodynamics 46, no. 3 (2021): 321–27. http://dx.doi.org/10.1515/jnet-2020-0113.

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Abstract The entropy generation rate in a low dimensional film is formulated incorporating the heat flux and effective thermal conductivity of the film material. In the analysis, the mathematical formulation employed is kept the same as that used in the diffusive regime. However, the entropy generation rate is corrected by replacing the bulk thermal conductivity with an effective thermal conductivity evaluated from the Boltzmann equation. The entropy generation rate using the phonon distribution from the equation of phonon radiative transport in the film material is employed. The results show

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Pal, Rajinder. "Teaching Fluid Mechanics and Thermodynamics Simultaneously through Pipeline Flow Experiments." Fluids 4, no. 2 (2019): 103. http://dx.doi.org/10.3390/fluids4020103.

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Entropy and entropy generation are abstract and illusive concepts for undergraduate students. In general, students find it difficult to visualize entropy generation in real (irreversible) processes, especially at a mechanistic level. Fluid mechanics laboratory can assist students in making the concepts of entropy and entropy generation more tangible. In flow of real fluids, dissipation of mechanical energy takes place due to friction in fluids. The dissipation of mechanical energy in pipeline flow is reflected in loss of pressure of fluid. The degradation of high quality mechanical energy into

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Idris, Roslinda, Shahrum Abdullah, Prakash Thamburaja, and Mohd Zaidi Omar. "Prediction of Fatigue Crack Growth Rate Based on Entropy Generation." Entropy 22, no. 1 (2019): 9. http://dx.doi.org/10.3390/e22010009.

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This paper presents the assessment of fatigue crack growth rate for dual-phase steel under spectrum loading based on entropy generation. According to the second law of thermodynamics, fatigue crack growth is related to entropy gain because of its irreversibility. In this work, the temperature evolution and crack length were simultaneously measured during fatigue crack growth tests until failure to ensure the validity of the assessment. Results indicated a significant correlation between fatigue crack growth rate and entropy. This relationship is the basis in developing a model that can determi

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Ghaffari, Abuzar, Waqar Khan, and Irfan Mustafa. "Effects of gaseous slip flow and temperature jump on entropy generation rate in rectangular microducts." Thermal Science 24, no. 5 Part A (2020): 3001–11. http://dx.doi.org/10.2298/tsci181115029g.

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In this study, the influence of slip flow and temperature jump on the entropy generation rate are investigated in rectangular microducts. The Knudsen numbers are considered in the range between 0.001 and 0.1, and the aspect ratio lies between 0 and 1. The dimensionless governing equations are solved numerically using Chebyshev spectral collocation method, and the dimensionless velocity and temperature gradients are employed in the entropy generation model. The influences of the dimensionless numbers including Bejan number and irreversibility distribution ratio on the entropy generation rates a

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Shahsavar, Amin, Pouyan Talebizadeh Sardari, and D. Toghraie. "Free convection heat transfer and entropy generation analysis of water-Fe3O4/CNT hybrid nanofluid in a concentric annulus." International Journal of Numerical Methods for Heat & Fluid Flow 29, no. 3 (2019): 915–34. http://dx.doi.org/10.1108/hff-08-2018-0424.

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Purpose This paper aims to numerically investigate the heat transfer and entropy generation characteristics of water-based hybrid nanofluid in natural convection flow inside a concentric horizontal annulus. Design/methodology/approach The hybrid nanofluid is prepared by suspending tetramethylammonium hydroxide-coated Fe3O4 (magnetite) nanoparticles and gum arabic (GA)-coated carbon nanotubes (CNTs) in water. The effects of nanoparticle volume concentration and Rayleigh number on the streamlines, isotherms, average Nusselt number and the thermal, frictional and total entropy generation rates ar

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Mohaghegh, Mohammad, and Esfahani Abolfazli. "Entropy generation analysis of free convection from a constant temperature vertical plate using similarity solution." Thermal Science 20, no. 6 (2016): 1855–66. http://dx.doi.org/10.2298/tsci140103092m.

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This paper presents a similarity solution analysis of entropy generation due to heat transfer and fluid flow which has been carried out for laminar free convection from a constant temperature vertical plate in an infinite quiescent fluid. The governing partial differential equations are transformed into a set of ordinary differential equations using similarity variables. So an analytical expression, in terms of entropy generation, entropy generation number, Bejan number and irreversibility distribution ratio are derived using velocity and temperature similarity (exact) solution. The rate of en

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Feng, Huijun, Lingen Chen, Zhihui Xie, and Fengrui Sun. "Constructal entropy generation rate minimization for X-shaped vascular networks." International Journal of Thermal Sciences 92 (June 2015): 129–37. http://dx.doi.org/10.1016/j.ijthermalsci.2015.01.029.

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Beretta, Gian Paolo. "Modeling Non-Equilibrium Dynamics of a Discrete Probability Distribution: General Rate Equation for Maximal Entropy Generation in a Maximum-Entropy Landscape with Time-Dependent Constraints." Entropy 10, no. 3 (2008): 160–82. http://dx.doi.org/10.3390/entropy-e10030160.

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Davies, M. R. D., and F. K. O’Donnell. "Local Measurement of Loss Using Heated Thin-Film Sensors." Journal of Turbomachinery 121, no. 4 (1999): 814–18. http://dx.doi.org/10.1115/1.2836735.

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A calibration equation is derived linking the nondimensional entropy generation rate per unit area with the nondimensional aerodynamic wall shear stress and free-stream pressure gradient. It is proposed that the latter quantities, which can be measured from surface sensors, be used to measure the profile entropy generation rate. It is shown that the equation is accurate for a wide range of well-defined laminar profiles. To measure the dimensional entropy generation rate per unit area requires measurement of the thickness of the boundary layer. A general profile equation is given and used to sh

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Sun, Shien, Haihua Luo, Basher Hassan Al-Kbodi, Qiang Shen, and Houlei Zhang. "Heat Transfer and Entropy Generation Evaluation on Molten Salt Tank Foundation with Internal Water Cooling." E3S Web of Conferences 194 (2020): 01032. http://dx.doi.org/10.1051/e3sconf/202019401032.

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Molten salt tanks are used to store and release thermal energy. Large heat leakage through the molten salt tank foundation to the ground and high temperature of the foundation are detrimental to long-term operation safety. Here we evaluate the heat transfer and entropy generation characteristics of molten salt tank foundations with internal water cooling. Both laminar and turbulent flows reduce the heat leakage efficiently, while the power consumption for the laminar flow is negligible. The effects of the geometrical parameters are presented. Internal fins in the cooling channels decrease the

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Helios, Muhammad Penta, and Wanchai Asvapoositkul. "Numerical studies for effect of geometrical parameters on water jet pump performance via entropy generation analysis." Journal of Mechanical Engineering and Sciences 15, no. 3 (2021): 8319–31. http://dx.doi.org/10.15282/15.3.2021.10.0654.

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This paper presented an implementation of entropy generation analysis in the main flow field of a water jet pump via the CFD method. This study aimed to identify the inefficient location of energy conversion and to analyse entropy generation sources in each region of the water jet pump. The 2D-axisymmetric model and realisable k-ε (RKE) turbulence model at steady-state conditions were performed to validate jet pump performance and to assess the entropy generation. Likewise, the effects of the projection ratio and throat-aspect ratio as independent parameters were investigated. As a result, the

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Dong, Zhimin, and Qinglin Du. "The Local Distribution of Temperatures and Entropy Generation Rate in an Ideal Counterflow Heat Exchanger." Coatings 11, no. 8 (2021): 970. http://dx.doi.org/10.3390/coatings11080970.

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The process of heat exchange between two fluids of different temperatures and separated by a solid wall occurs in many engineering applications. Log mean temperature difference and effectiveness-NTU methods are widely used to assist in the design of heat exchangers. However, the two methods focus on overall analysis and cannot show the local temperature distributions. This paper obtains the mathematical solutions to the temperature profiles in an ideal counterflow heat exchanger. The aim of this research is to explain the phenomenon called the “entropy generation paradox”, which indicates a di

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Sekhar, Jainagesh A. "Self-Organization, Entropy Generation Rate, and Boundary Defects: A Control Volume Approach." Entropy 23, no. 8 (2021): 1092. http://dx.doi.org/10.3390/e23081092.

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Self-organization that leads to the discontinuous emergence of optimized new patterns is related to entropy generation and the export of entropy. Compared to the original pattern that the new, self-organized pattern replaces, the new features could involve an abrupt change in the pattern-volume. There is no clear principle of pathway selection for self-organization that is known for triggering a particular new self-organization pattern. The new pattern displays different types of boundary-defects necessary for stabilizing the new order. Boundary-defects can contain high entropy regions of conc

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Bejan, Adrian. "The Equivalence of Maximum Power and Minimum Entropy Generation Rate in the Optimization of Power Plants." Journal of Energy Resources Technology 118, no. 2 (1996): 98–101. http://dx.doi.org/10.1115/1.2792711.

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It is shown that to maximize the power output of a power plant is equivalent to minimizing the total entropy generation rate associated with the power plant. This equivalence is illustrated by using two of the oldest and simplest models of power plants with heat transfer irreversibilities. To calculate the total entropy generation rate correctly, one must recognize that the optimization process (e.g., the variability of the heat input) requires “room to move,” i.e., an additional, usually overlooked, contribution to the total entropy generation rate.

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Teng, H., C. M. Kinoshita, S. M. Masutani, and J. Zhou. "Entropy Generation in Multicomponent Reacting Flows." Journal of Energy Resources Technology 120, no. 3 (1998): 226–32. http://dx.doi.org/10.1115/1.2795040.

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A comprehensive equation to determine the rate of local entropy generation in multicomponent, reacting, laminar fluid flow involving heat and mass transfer is formulated based on species-average velocity in a multicomponent continuum. The entropy-generation equation developed in this study suggests that species diffusion induces a diffusive-viscous effect, heretofore not reported in the literature, which could contribute significantly to entropy generation in multicomponent fluid systems, and that entropy generation in a multicomponent system exceeds that in a single-component fluid system hav

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Walsh, Edmond J., Kevin P. Nolan, Donald M. McEligot, Ralph J. Volino, and Adrian Bejan. "Conditionally-Sampled Turbulent and Nonturbulent Measurements of Entropy Generation Rate in the Transition Region of Boundary Layers." Journal of Fluids Engineering 129, no. 5 (2007): 659–64. http://dx.doi.org/10.1115/1.2717622.

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Conditionally-sampled boundary layer data for an accelerating transitional boundary layer have been analyzed to calculate the entropy generation rate in the transition region. By weighing the nondimensional dissipation coefficient for the laminar-conditioned-data and turbulent-conditioned-data with the intermittency factor γ the average entropy generation rate in the transition region can be determined and hence be compared to the time averaged data and correlations for steady laminar and turbulent flows. It is demonstrated that this method provides, for the first time, an accurate and detaile

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Wang, Wei, Jun Wang, Hui Liu, and Bo-yan Jiang. "CFD Prediction of Airfoil Drag in Viscous Flow Using the Entropy Generation Method." Mathematical Problems in Engineering 2018 (2018): 1–15. http://dx.doi.org/10.1155/2018/4347650.

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A new aerodynamic force of drag prediction approach was developed to compute the airfoil drag via entropy generation rate in the flow field. According to the momentum balance, entropy generation and its relationship to drag were derived for viscous flow. Model equations for the calculation of the local entropy generation in turbulent flows were presented by extending the RANS procedure to the entropy balance equation. The accuracy of algorithm and programs was assessed by simulating the pressure coefficient distribution and dragging coefficient of different airfoils under different Reynolds nu

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Niezgoda-Żelasko, Beata. "Entropy Generation of Forced Convection during Melting of Ice Slurry." Entropy 21, no. 5 (2019): 514. http://dx.doi.org/10.3390/e21050514.

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This paper looks at entropy generation during ice slurry flow in straight pipes and typical heat exchanger structures used in refrigeration and air-conditioning technology. A dimensionless relationship was proposed to determine the interdependency between flow velocity and the volume fraction of ice, for which the entropy generation rates were at the minimum level in the case of non-adiabatic ice slurry flow. For pipe flow, the correlation between the minimum entropy generation rate and the overall enhancement efficiency was analyzed. As regards heat exchange processes in heat exchangers, the

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Xu, Hang, Ammarah Raees, and Xiao-Hang Xu. "Entropy generation of nanofluid flow and heat transfer driven through a paralleled microchannel." Canadian Journal of Physics 97, no. 6 (2019): 678–91. http://dx.doi.org/10.1139/cjp-2018-0548.

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In this paper, a fully-developed, immiscible nanofluid flow in a paralleled microchannel in the presence of a magnetic field is investigated. Buongiorno’s model is applied to describe the behaviors of the nanofluid flow. Different from most previous studies on microchannel flow, here the pressure term is considered as unknown, which makes the current model compatible with the commonly accepted channel flow models. The influences of various physical parameters on important physical quantities are given. The entropy generation analysis is performed. Variations of local and global entropy generat

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Srinivas, J., J. V. Ramana Murthy, and Ali J. Chamkha. "Analysis of entropy generation in an inclined channel flow containing two immiscible micropolar fluids using HAM." International Journal of Numerical Methods for Heat & Fluid Flow 26, no. 3/4 (2016): 1027–49. http://dx.doi.org/10.1108/hff-09-2015-0354.

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Purpose – The purpose of this paper is to examine the flow, heat transfer and entropy generation characteristics for an inclined channel of two immiscible micropolar fluids. Design/methodology/approach – The flow region consists of two zones, the flow of the heavier fluid taking place in the lower zone. The flow is assumed to be governed by Eringen’s micropolar fluid flow equation. The resulting governing equations are then solved using the homotopy analysis method. Findings – The following findings are concluded: first, the entropy generation rate is more near the plates in both the zones as

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Mohammed, Amin A., Mehmet Sunar, and Ahmet Z. Sahin. "Entropy generation rate analysis in pendulum cart system undergoing damped oscillation." International Journal of Exergy 31, no. 3 (2020): 217. http://dx.doi.org/10.1504/ijex.2020.10027865.

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Mohammed, Amin A., Mehmet Sunar, and Ahmet Z. Sahin. "Entropy generation rate analysis in pendulum cart system undergoing damped oscillation." International Journal of Exergy 31, no. 3 (2020): 217. http://dx.doi.org/10.1504/ijex.2020.106452.

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Chen, Lingen, Aibo Yang, Zhihui Xie, and Fengrui Sun. "Constructal entropy generation rate minimization for cylindrical pin-fin heat sinks." International Journal of Thermal Sciences 111 (January 2017): 168–74. http://dx.doi.org/10.1016/j.ijthermalsci.2016.08.017.

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KONG, Rui, LinGen CHEN, ShaoJun XIA, et al. "Minimization of entropy generation rate during hydrogen iodide decomposition reaction process." SCIENTIA SINICA Technologica 51, no. 5 (2020): 565–79. http://dx.doi.org/10.1360/sst-2020-0008.

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Askowski, Rafał, Maciej Jaworski, and Adam Smyk. "Entropy generation in a condenser and related correlations." Archives of Thermodynamics 36, no. 2 (2015): 27–48. http://dx.doi.org/10.1515/aoter-2015-0013.

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Abstract The paper presents an analysis of relations describing entropy generation in a condenser of a steam unit. Connections between entropy generation, condenser ratio, and heat exchanger effectiveness, as well as relations implied by them are shown. Theoretical considerations allowed to determine limits of individual parameters which describe the condenser operation. Various relations for average temperature of the cold fluid were compared. All the proposed relations were verified against data obtained using a simulator and actual measurement data from a 200 MW unit condenser. Based on dat

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Amigó, José M., Janusz Szczepański, Elek Wajnryb, and Maria V. Sanchez-Vives. "Estimating the Entropy Rate of Spike Trains via Lempel-Ziv Complexity." Neural Computation 16, no. 4 (2004): 717–36. http://dx.doi.org/10.1162/089976604322860677.

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Normalized Lempel-Ziv complexity, which measures the generation rate of new patterns along a digital sequence, is closely related to such important source properties as entropy and compression ratio, but, in contrast to these, it is a property of individual sequences. In this article, we propose to exploit this concept to estimate (or, at least, to bound from below) the entropy of neural discharges (spike trains). The main advantages of this method include fast convergence of the estimator (as supported by numerical simulation) and the fact that there is no need to know the probability law of

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Mehmood, Ahmer, Muhammad Iqbal, Sajid Khan, and Sufian Munawar. "Entropy analysis in moving wavy surface boundary-layer." Thermal Science 23, no. 1 (2019): 233–41. http://dx.doi.org/10.2298/tsci161029029m.

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It is a well-established fact that significant gain in the heat transfer rate can be obtained by altering that flat surface texture of the working body. The most convenient alteration, in view of mathematical handling, is the wavy one. Existing studies reveal that the convective heat transfer phenomenon is affected significantly due to the presence of a solid wavy surface. How does the phenomena of entropy generation is effected due to a wavy surface is the question investigated in this manuscript. The expressions for irreversibility distribution rate, Bejan number, and volumetric entropy gene

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Khan, W. A., J. R. Culham, and M. M. Yovanovich. "The Role of Fin Geometry in Heat Sink Performance." Journal of Electronic Packaging 128, no. 4 (2006): 324–30. http://dx.doi.org/10.1115/1.2351896.

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The following study will examine the effect on overall thermal/fluid performance associated with different fin geometries, including, rectangular plate fins as well as square, circular, and elliptical pin fins. The use of entropy generation minimization, EGM, allows the combined effect of thermal resistance and pressure drop to be assessed through the simultaneous interaction with the heat sink. A general dimensionless expression for the entropy generation rate is obtained by considering a control volume around the pin fin including base plate and applying the conservations equations for mass

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Vandadi, V., A. Vandadi, H. Niazmand, and C. Aghanajafi. "Entropy Generation Analysis for Microscale Forced Convection in Thermal Entrance Region." Journal of Mechanics 28, no. 1 (2012): 71–76. http://dx.doi.org/10.1017/jmech.2012.7.

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ABSTRACTAn analytical study on entropy generation considering viscous dissipation effect in the circular microchannel is reported. The fluid flow is steady, laminar, hydrodynamically fully developed and thermally developing. In the first law analysis, appropriate dimensionless variables are applied to solve the energy equation in the thermal entrance region of microchannel. Subsequently the obtained temperature field is used to derive an expression for entropy generation rate. The effect of Knudsen number and Brinkman number on the entropy generation rate and Bejan number in different axial lo

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Favas, T. K., and G. Jilani. "Effect of variable thermal conductivity on entropy generation in a plate with internal energy generation." MATEC Web of Conferences 144 (2018): 04001. http://dx.doi.org/10.1051/matecconf/201814404001.

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The current numerical investigation aims at analyzing the effect of variable thermal conductivity on local and global entropy generation rates in an energy generating plate dissipating heat by conjugate conduction-forced convection heat transfer. In order to fulfill this objective, the physical model of the plate dissipating heat into surrounding coolant is transformed into a mathematical model governing the temperature field in the plate as well as flow and thermal fields in the fluid. The resulting mathematical model, being a set of coupled and non linear partial differential equations, is s

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Kumar, Krishan, Rajan Kumar, and Rabinder Singh Bharj. "Circular Microchannel Heat Sink Optimization Using Entropy Generation Minimization Method." Journal of Non-Equilibrium Thermodynamics 45, no. 4 (2020): 333–42. http://dx.doi.org/10.1515/jnet-2019-0086.

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AbstractThe performance of the microchannel heat sink (MCHS) in electronic applications needs to be optimized corresponding to the number of channels (N). In this study optimization of the number of channels corresponding to the diameter of the microchannel ({D_{N}}) using an entropy generation minimization approach is achieved for the MCHS used in electronic applications. The numerical study is performed for constant total heat flow rate ({\dot{q}_{tot}}) and total mass flow rate ({\dot{m}_{tot}}). The results indicate that the dominance of frictional entropy generation ({S_{gen,Fr}}) increas

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Chang, Tong-Bou. "Theoretical Analysis of Effects of Wall Suction on Entropy Generation Rate in Laminar Condensate Layer on Horizontal Tube." Mathematical Problems in Engineering 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/172605.

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The effects of wall suction on the entropy generation rate in a two-dimensional steady film condensation flow on a horizontal tube are investigated theoretically. In analyzing the liquid flow, the effects of both the gravitational force and the viscous force are taken into account. In addition, a film thickness reduction ratio,Sf, is introduced to evaluate the effect of wall suction on the thickness of the condensate layer. The analytical results show that, the entropy generation rate depends on the Jakob number Ja, the Rayleigh number Ra, the Brinkman number Br, the dimensionless temperature

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Nolan, Kevin P., Edmond J. Walsh, Donald M. McEligot, and Ralph J. Volino. "Predicting Entropy Generation Rates in Transitional Boundary Layers Based on Intermittency." Journal of Turbomachinery 129, no. 3 (2006): 512–17. http://dx.doi.org/10.1115/1.2720488.

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Prediction of thermodynamic loss in transitional boundary layers is typically based on time-averaged data only. This approach effectively ignores the intermittent nature of the transition region. In this work laminar and turbulent conditionally sampled boundary layer data for zero pressure gradient and accelerating transitional boundary layers have been analyzed to calculate the entropy generation rate in the transition region. By weighting the nondimensional dissipation coefficient for the laminar conditioned data and turbulent conditioned data with the intermittency factor, the entropy gener

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Wei, Yikun, Pingping Shen, Zhengdao Wang, Hong Liang, and Yuehong Qian. "Time Evolution Features of Entropy Generation Rate in Turbulent Rayleigh-Bénard Convection with Mixed Insulating and Conducting Boundary Conditions." Entropy 22, no. 6 (2020): 672. http://dx.doi.org/10.3390/e22060672.

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Time evolution features of kinetic and thermal entropy generation rates in turbulent Rayleigh-Bénard (RB) convection with mixed insulating and conducting boundary conditions at Ra = 109 are numerically investigated using the lattice Boltzmann method. The state of flow gradually develops from laminar flow to full turbulent thermal convection motion, and further evolves from full turbulent thermal convection to dissipation flow in the process of turbulent energy transfer. It was seen that the viscous, thermal, and total entropy generation rates gradually increase in wide range of t/τ < 32 wit

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Qayyum, Sumaira, Muhammad Ijaz Khan, Tasawar Hayat, and Ahmed Alsaedi. "Entropy generation and thermo-diffusion effects on unsteady chemically reactive slip flow between two rotating disks." International Journal of Numerical Methods for Heat & Fluid Flow 29, no. 10 (2019): 3795–821. http://dx.doi.org/10.1108/hff-05-2018-0183.

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Purpose The purpose of this study is to analyze the Entropy generation analysis and heat transport in three-dimensional flow between two stretchable disks. Joule heating and heat generation/absorption are incorporated in the thermal equation. Thermo-diffusion effect is also considered. Flow is conducting for time-dependent applied magnetic field. Induced magnetic field is not taken into consideration. Velocity and thermal slip conditions at both the disks are implemented. The flow problem is modeled by using Navier–Stokes equations with entropy generation rate and Bejan number. Design/methodol

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Al-Hamed, Khaled H. M., and Ahmet Z. Sahin. "Minimization of Temheat Destruction Rate and Entropy Generation Rate in a 1D Transient Conductive Slab." Arabian Journal for Science and Engineering 45, no. 11 (2020): 9497–503. http://dx.doi.org/10.1007/s13369-020-04823-w.

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Dung, S. C., S. H. Tzeng, and S. A. Yang. "Entropy Generation of Free Convection Film Condensation From Downward Flowing Vapors onto a Cylinder or Sphere." Journal of Mechanics 23, no. 4 (2007): 303–8. http://dx.doi.org/10.1017/s1727719100001350.

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AbstractThis study aims at analyzing entropy generation rate of saturated vapor flowing slowly onto and condensed on an isothermal sphere/horizontal cylinder. We derive an expression for entropy generation, which accounts for the resultant action of specified irreversibilities of film-wise condensation outside a cylinder/sphere. The result shows that local entropy generation rate increases with Brinkman group parameters. As Rayleigh group parameters increase, dimensionless heat transfer coefficient is enhanced, but entropy generation number is augmented too. Heat transfer irreversibility domin

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