Heat transportation performance and entropy generation analysis of Iron (II, III) oxide microparticles on Taylor Couette flow over a slit wall

Sun, Si-liang; Liu, Dong; Wang, Yingze; Qi, Yuan-li; Kim, Hyoung-Bum

doi:10.1016/j.icheatmasstransfer.2022.106479

Cited by 10 publications

(3 citation statements)

References 43 publications

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“…The total entropy generation rate can be determined utilizing Equation (25), where the first and second terms are the entropy generation due to thermal irreversibilities and viscous irreversibilities, respectively. Both terms can be expressed separately in Equation (26) and Equation (27).…”

Section: Second Law Analysismentioning

confidence: 99%

“…Evidence suggests that the introduction of greater angled DRF indefinitely results in higher viscous irreversibility generation, in comparison to lower angles. This can be accredited to the immense blockage and fluid occurrences of higher angled DRF, which results in chaotic pressure distribution and increments in the friction factors, significantly affecting the viscous entropy generation rate as stated in Equation (27). Furthermore, as increased flow velocities effectuate rise in the mass flow rates and Reynolds numbers, viscous irreversibilities are enhanced with incremental Reynolds numbers.…”

Section: Second Law Analysismentioning

confidence: 99%

“…Besides this, complex flows involving large temperature gradients are often investigated utilizing first law analysis for thermodynamic evaluation. However, this approach does not sufficiently address the complexity of effective energy dissipation and transfer mechanisms [27,28]. This necessitates second law analysis as an approach to investigate such losses and the true thermodynamic influence of the heat transfer enhancement method.…”

Section: Introductionmentioning

confidence: 99%

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Thermohydraulic and Irreversibility Analyses of Swirl Flows Utilizing Distorted Radial Fins: Entropy Generation and Entransy Dissipation Evaluation

Ho,

Tan,

Hung

et al. 2023

International Journal of Energy Research

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The current investigation analyses the convective heat transfer performance, entropy generation, and entransy evaluation of swirl flows generated by distorted radial fins (DRF). As swirl flows and various vortical structures induce large temperature gradients, second law and entransy analyses are necessary to thoroughly evaluate their true thermodynamic influence on heat transfer enhancement. The results indicated that due to the influence of swirl flows and vortices, all angles of the DRF were capable of inducing intense fluid mixing, thinner thermal boundary layers, and turbulent eddies. It was found that overaggressive swirl flows may hinder local heat transfer performances, by enclosing low-velocity heated fluids within the thermal boundary layers. However, as these overaggressive swirl flows and strong vortices propagate downstream, beneficial fluid mixing was eventuated, favouring heat transport over large regions. In terms of thermal performances, the maximum heat transfer enhancement was exhibited by the α=45° DRF, improving the Nusselt numbers up to 59.3%. Accordingly, the highest performance evaluation criterion (PEC) of 1.269 was obtained by the α=45° DRF at the Reynolds number 2389, attributed to the centrifugal effects of the swirl flows. Optimal entropy generation numbers were also exhibited by the α=45° DRF at the highest studied Reynolds number, reducing total entropy generation by 36.81%. Lower entransy thermal resistances were also accredited to greater DRF angles due to the intense swirl effects. In essence, the study concludes that the effects of swirl flows and vortices significantly enhance heat transfer, whilst reducing both entropy generation and entransy dissipation rates, leading to optimal thermal performances.

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Section: Second Law Analysismentioning

confidence: 99%

Section: Second Law Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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