Combining liquid inertia and evaporation momentum forces to achieve flow boiling inversion and performance enhancement in asymmetric Dual V-groove microchannels

Moreira, D.C.; Nascimento, V.S.; Ribatski, Gherhardt; Kandlikar, Satish G.

doi:10.1016/j.ijheatmasstransfer.2022.123009

Cited by 15 publications

(5 citation statements)

References 34 publications

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“…The structured cavities examined in this study have demonstrated the ability to enhance the flow boiling phenomenon, as shown in Moreira et al [46]. Consequently, we aim here to investigate whether natural convection can be enhanced by the same surface structures.…”

Section: Results For Natural Convection With Structured Cavitiesmentioning

confidence: 72%

“…Both Dirichlet and Neumann boundary conditions at the enclosure's bottom are considered to assess how cavities affect heat transfer, determining their impact on intensifying heat transfer rates at the solid surface. We conducted natural convection simulations using the structured cavities outlined in Moreira et al [46]. Figure 5 provides schematic representation of the tested geometries.…”

Section: Results For Natural Convection With Structured Cavitiesmentioning

confidence: 99%

See 1 more Smart Citation

A Modified Enthalpic Lattice Boltzmann Method for Simulating Conjugate Heat Transfer Problems in Non-homogeneous Media

Matsuda,

Martins,

Moreira

et al. 2024

Preprint

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This paper introduces a new adaptation of the enthalpic lattice Boltzmann method (LBM) tailored to simulate the intricate dynamics of conjugate heat transfer in non-homogeneous media, showcasing considerable potential for enhancing heat exchanger designs. This approach expands upon the conventional enthalpic LBM framework by seamlessly incorporating tailored source terms, enabling precise representation of local and transient variations in the medium’s thermophysical properties. The resulting LBM model comprehensively captures the energy conservation equation, with exceptions made only for flow compressibility and viscous dissipation, thereby significantly augmenting its versatility in analyzing heat exchanger configurations. Verification tests, comprising assessments of both transient and steady-state solutions, unequivocally validate the accuracy of the proposed model, further bolstering its reliability for analyzing heat exchange processes within intricate heat exchanger geometries. To demonstrate its efficacy, simulations of conjugate heat transfer processes involving fluid natural convection within structured cavities were performed, imposing both Dirichlet and Neumann boundary conditions to emulate scenarios encountered in practical heat exchanger operations. The findings yield compelling insights, particularly in the transient regime, revealing the beneficial impact of structured cavities on enhancing heat transfer processes. These insights inform potential design optimizations for heat exchangers. The results emphasize the potential of the modified enthalpic LBM approach to elucidate complex heat transfer phenomena in non-homogeneous media and structured geometries, offering valuable implications for heat exchanger engineering and optimization.

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Section: Results For Natural Convection With Structured Cavitiesmentioning

confidence: 72%

Section: Results For Natural Convection With Structured Cavitiesmentioning

confidence: 99%

A Modified Enthalpic Lattice Boltzmann Method for Simulating Conjugate Heat Transfer Problems in Non-homogeneous Media

Matsuda,

Martins,

Moreira

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…The structured cavities examined in this study have demonstrated the ability to enhance the flow boiling phenomenon, as shown in Moreira et al [42]. Consequently, we aim here to investigate whether natural convection can be enhanced by the same surface structures.…”

Section: Results For Natural Convection With Structured Cavitiesmentioning

confidence: 72%

“…Both Dirichlet and Neumann boundary conditions at the enclosure's bottom are considered to assess how cavities affect heat transfer, determining their impact on the intensifying heat transfer rates at the solid surface. We conducted natural convection simulations using the structured cavities outlined in Moreira et al [42]. Figure 5 provides a schematic representation of the tested geometries, Geometry 1 with θ = 30 • , Geometry 2 with θ = 45 • , and Geometry 3 with θ = 60 • .…”

Section: Results For Natural Convection With Structured Cavitiesmentioning

confidence: 99%

A Modified Enthalpic Lattice Boltzmann Method for Simulating Conjugate Heat Transfer Problems in Non-Homogeneous Media

Matsuda,

Martins,

Moreira

et al. 2024

Inventions

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In this study, we introduced modifications to a prior existing enthalpic lattice Boltzmann method (LBM) tailored for simulating the conjugate heat transfer phenomena in non-homogeneous media with time-dependent thermal properties. Our approach is based upon the incorporation of the remaining terms of a conservative energy equation, excluding only the terms regarding flow compressibility and viscous dissipation, thereby accounting for the local and transient variations in the thermophysical properties. The solutions of verification tests, comprising assessments of both transient and steady-state solutions, validated the accuracy of the proposed model, further bolstering its reliability for analyzing heat transfer processes. The modified model was then used to perform an analysis on structured cavities under free convection, revealing compelling insights, particularly regarding transient regimes, demonstrating that the structured cavities exhibit a beneficial impact on enhancing the heat transfer processes, hence providing insights for potential design enhancements in heat exchangers. These results demonstrate the potential of our modified enthalpic LBM approach for simulating complex heat transfer phenomena in non-homogeneous media and structured geometries, offering valuable results for heat exchanger engineering and optimization.

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“…Groove width was set at 250 µm, with both spacing and depth of approximately 2 mm. Moreira et al [16] improved HTC and CHF, reduced pressure drops, and even observed boiling inversion, reported for the first time for flow boiling. The authors employed distilled water in tapered microchannels with micro-milled dual V grooves.…”

Section: Micromachined Groovesmentioning

confidence: 93%

A Review on Flow Boiling Enhancement on Textured Surfaces

Mertens,

Castagne,

Vetrano

2024

Energies

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It is widely established that flow boiling, being a direct cooling technique also employing the latent heat of the fluid, has the potential to be more efficient than being useful in single-phase conventional cooling methods. This results in considerable potential for thermal management in many fields like microelectronics, space technology, thermal power plants, etc. The increasing demand for heat dissipation, consequent to component miniaturization, has pushed the development of new strategies for enhancing heat transfer efficiency, such as employment of functionalized surfaces. This review aims to describe in detail the current status of technology related to flow boiling heat transfer enhancement via micro/nanoscale surface functionalization. Key objectives are an increased nucleation site density and enhanced bubble dynamics. The vast majority of findings show favorable heat transfer performance, evidenced by an earlier onset of boiling (ONB), an improved flow boiling heat transfer coefficient (HTC), and an ameliorated critical heat flux (CHF). Increased pressure drop is a serious concern in certain application cases. Nanoscale textures mainly enhance capillary wicking to nucleation sites, thus being more effective in combination with microscale textures that define fixed nucleation sites. Degradation effects need to be more thoroughly and systematically characterized for application cases. Extra effects related to the manufacturing process can be easily overlooked, but one should be aware of their possible existence when drawing conclusions. Finally, the implementation of enhanced surfaces in mainstream applications is hindered by the absence of general predictive design tools for different channel configurations/materials, fluids, and operating conditions. A more universal understanding of the basic mechanisms involving texture geometry is needed in this aspect.

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Combining liquid inertia and evaporation momentum forces to achieve flow boiling inversion and performance enhancement in asymmetric Dual V-groove microchannels

Cited by 15 publications

References 34 publications

A Modified Enthalpic Lattice Boltzmann Method for Simulating Conjugate Heat Transfer Problems in Non-homogeneous Media

A Modified Enthalpic Lattice Boltzmann Method for Simulating Conjugate Heat Transfer Problems in Non-homogeneous Media

A Modified Enthalpic Lattice Boltzmann Method for Simulating Conjugate Heat Transfer Problems in Non-Homogeneous Media

A Review on Flow Boiling Enhancement on Textured Surfaces

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