Field synergy principle analysis on fully developed forced convection in porous medium with uniform heat generation

Chen, Gooi Mee; Tso, C.P.; Hung, Yew Mun

doi:10.1016/j.icheatmasstransfer.2011.06.010

Cited by 22 publications

(12 citation statements)

References 11 publications

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“…Second, Appendix A shows that in the limit of fully filled channel the LTE solutions of Section 2.4 coincide with those of Ref. [46]. Fig.…”

Section: Resultssupporting

confidence: 74%

“…A.1. shows that the temperature files calculated by the current work coincides on that by Ref. [46].…”

Section: Appendix Asupporting

confidence: 87%

“…The relation between the remaining parameters in our study and those in Ref. [46] would be as follows.…”

Section: Appendix Amentioning

confidence: 64%

“…Comparison between temperature distribution using LTE model in the present study (solid line) and Chen et al[46] (circle).…”

mentioning

confidence: 62%

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Generation of entropy and forced convection of heat in a conduit partially filled with porous media – Local thermal non-equilibrium and exothermicity effects

Torabi

Karimi

Zhang

et al. 2016

Applied Thermal Engineering

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h i g h l i g h t sLocal and total entropy generations in endothermic/exothermic channels are investigated. Convection interface boundary condition has been incorporated into the modelling. Partial filling of the channel with LTE and LTNE for energy equations are considered. Bifurcation phenomena for temperature and local entropy generation are observed. Analytical solutions for temperature and entropy generation rates are obtained. a b s t r a c tThe performance of a two-dimensional, axisymmetric channel with porous inserts attached to the walls is analyzed from the perspective of the first and second laws of thermodynamics. In this analysis, the flow is assumed to be fully developed with a constant heat flux imposed on the external surfaces of the walls, while heat could be internally generated by the fluid and solid phases. Using a Darcy-Brinkman model of momentum transport along with a two-equation thermal energy model, a convective model was developed to describe the thermal boundary conditions on the porous-fluid interface. The so-called Model A was employed on the walls of the channel and semi-analytical solutions were developed for the hydrodynamic, temperature, entropy generation fields and the Nusselt number, and an extensive parametric study was subsequently, conducted. The results indicated that the inclusion of exothermicity leads to significant modifications in the thermal and entropic behaviour of the system. In particular, through comparison with the recent literature, it was demonstrated that exothermicity can significantly impact the influence of the porous-fluid interface model upon the generation of both the local and total entropy within the system.

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“…Second, Appendix A shows that in the limit of fully filled channel the LTE solutions of Section 2.4 coincide with those of Ref. [46]. Fig.…”

Section: Resultssupporting

confidence: 74%

“…A.1. shows that the temperature files calculated by the current work coincides on that by Ref. [46].…”

Section: Appendix Asupporting

confidence: 87%

See 2 more Smart Citations

Generation of entropy and forced convection of heat in a conduit partially filled with porous media – Local thermal non-equilibrium and exothermicity effects

Torabi

Karimi

Zhang

et al. 2016

Applied Thermal Engineering

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“…The principle indicates that the heat transfer rate is not only related to the velocity of the fluid and the temperature gradient, but also related to the synergy degree between the fluid velocity and temperature gradient. This principle has also been applied to heat convection enhancement (10,24,25) .…”

Section: Introductionmentioning

confidence: 99%

Entransy, Entransy Dissipation and Entransy Loss for Analyses of Heat Transfer and Heat-Work Conversion Processes

Cheng

Liang

2013

JTST

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Entransy is a parameter proposed in recent years to describe the potential of heat in an object. Its balance equation was established based on the energy equation of heat transfer, which contains entransy, entransy flow, entransy dissipation and entransy production due to heat source. It has been proved that the total entransy must be reduced whenever there is heat transfer in an isolated system, leading to entransy dissipation. Entransy dissipation and entransy-based thermal resistance can be used to optimize heat conduction, heat convection, thermal radiation and the design of heat exchangers and heat exchanger networks. On the other hand, the entransy balance equation was also established for heat-work conversion processes. With the equation, entransy loss, which is the difference between the input and output heat entransy flows, was defined and related to thermodynamic processes. For the discussed thermodynamic cycles, it was found that larger entransy loss leads to larger output work.

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Differentially heated cubical cavity using energy pathlines and field synergy

Rani

Naresh

Narayana³

2020

Heat Trans

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The article deals with the natural convective flow of air in a cubical cavity which is analyzed numerically. Isothermal temperature is maintained on the vertical walls where the temperature of the left wall is more than the right wall and all other walls are assumed to be kept insulated. In this present article, upwind, QUICK, SUPERBEE, and self‐filtered central differencing schemes are compared based on their accuracy and computational time with a numerical example. An attempt has been made to analyze the flow behavior inside the cavity using vortex corelines, streamlines, isotherms energy pathlines, and field synergy by varying the Rayleigh number (Ra) from 103 to 106. In the vicinity of isothermal vertical walls, the velocity, and temperature boundary layers become thinner as Ra increases. The energy pathlines are in oscillating nature when Ra increases to 105 and above. The field synergy principle implies by improving the synergy between the velocity and temperature, the heat transfer gets enhanced with the less increased flow resistance.

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Field synergy principle analysis on fully developed forced convection in porous medium with uniform heat generation

Cited by 22 publications

References 11 publications

Generation of entropy and forced convection of heat in a conduit partially filled with porous media – Local thermal non-equilibrium and exothermicity effects

Generation of entropy and forced convection of heat in a conduit partially filled with porous media – Local thermal non-equilibrium and exothermicity effects

Entransy, Entransy Dissipation and Entransy Loss for Analyses of Heat Transfer and Heat-Work Conversion Processes

Differentially heated cubical cavity using energy pathlines and field synergy

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