Determination of Diffusion Coefficient in Droplet Evaporation Experiment Using Response Surface Method

Chen, Xue; Wang, Xun; Chen, Paul G.; Liu, Qiusheng

doi:10.1007/s12217-018-9645-2

Cited by 8 publications

(6 citation statements)

References 29 publications

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“…This temperature difference has two main effects on the evaporation rate and resulting cell sedimentation: i) Surface evaporation occurs as a result of vapor transport at the bio-film/air interface. The vapor transport is highly dependent on the diffusion coefficient of the dissolved gas, where the diffusion coefficient exponentially increases with the temperature [42]. For example, the diffusion coefficient of air is almost five times higher at 60℃ compared to the room temperature.…”

Section: New Surface Morphology For Phase Change Systemsmentioning

confidence: 99%

Bio-coated surfaces with micro-roughness and micro-porosity: Next generation coatings for enhanced energy efficiency

Niazi

Sadaghiani

Gharıb

et al. 2021

Energy

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Due to growing cooling demands as well as emerging global warming and climate change issues, cooling systems should be more efficiently utilized. Boiling is an effective heat transfer mechanism, which has a critical role in many cooling systems. Surface modification is considered as the major approach for boiling heat transfer enhancement. In this study, we developed a microbial bio-coating surface modification technique for phase change cooling applications.Thermoacidophilic Sulfolobus solfataricus coating was implemented using a facile dip coating method on different metallic and non-metallic surfaces. Controlled by drying conditions, the coating exhibited rough and porous morphologies. When tested in a boiling heat transfer setup, bio-coated surfaces offered enhancements up to 76.3% in Critical Heat Flux (CHF). Next, a miniature evaporator was coated and tested for real-world air-conditioning applications, and coefficient of performance (COP) enhancements up to 11% clearly revealed the potential of biocoated surfaces for energy saving purpose and reduction in greenhouse gasses. Furthermore, coated evaporators reduced the exergy destruction rate up to 8%. This study not only offers a new type of coating morphology, but the applicability of the proposed bio-coating is also proven in a miniature air conditioning system.

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Section: New Surface Morphology For Phase Change Systemsmentioning

confidence: 99%

Bio-coated surfaces with micro-roughness and micro-porosity: Next generation coatings for enhanced energy efficiency

Niazi

Sadaghiani

Gharıb

et al. 2021

Energy

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“…Droplet evaporation in terrestrial (normal) gravity conditions involves a complex interaction of diffusion within the substrate, buoyant convection in the gas and liquid phases, contact line evaporation, vapour diffusion, evaporative cooling at the liquid-gas interface, and possible Marangoni effects 11 , 15 – 24 . Regardless, the main driving force of the evaporation for a sessile droplet is the vapour concentration gradient across the droplet surface 3 , 11 , 25 . Furthermore, albeit a proportionately small region compared with the overall droplet size, the heat and mass transfer at the contact line plays an important role in droplet evaporation dynamics, and this has been shown conclusively in terrestrial gravity conditions 15 , 17 – 19 , 26 .…”

Section: Introductionmentioning

confidence: 99%

“…In microgravity conditions, with the absence of gravity-driven convection, the flow field within an evaporating droplet on a heated substrate is largely determined by Marangoni flow 25 . The main driving evaporation mechanism is the vapour diffusivity at the liquid-gas interface, and since mass diffusion is quite a slow process, this generally leads to lower evaporation rates 5 .…”

Section: Introductionmentioning

confidence: 99%

Water droplet evaporation in varied gravity and electric fields

Gibbons,

Garivalis,

O’Shaughnessy

et al. 2024

npj Microgravity

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Sessile water droplet evaporation in varied gravity and electric fields has been experimentally studied. Specifically, the influences of gravity and electric fields are investigated in the context of the heat flux distribution beneath the droplets, as well as the droplet mechanics and resulting shapes. Experimental testing was carried out during a European Space Agency (ESA) Parabolic Flight Campaign (PFC 66). The droplets tested evaporated with a pinned contact line, a single wettability condition, and varied droplet volume and substrate heat flux. The peak heat transfer was located at the contact line for all cases. The peak heat flux, average heat flux, and droplet evaporation rate were shown to vary strongly with gravity, with higher values noted for hypergravity conditions and lower values in microgravity conditions. The droplet thermal inertia was shown to play a significant role, with larger droplets taking more time to reach thermal equilibrium during the parabolic testing period. No significant impact of the electric field on the droplet evaporation was noted for these test conditions.

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“…The overlapping air points are then defined to have the saturated humidity at the given temperature condition. Moreover, it is assumed that the main driving force of the liquid mass transfer into vapor at the air-water interface is diffusion driven by the vapor concentration gradient [12].…”

Section: Introductionmentioning

confidence: 99%

Water Evaporation CFD Method with the Meshfree Volume-Volume-Coupling Approach for Wet Automotive Component Dry-Out Time Prediction

Lee,

Baeder,

Rehfeldt

et al. 2024

IJAE

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A new two-phase mass transfer Computational Fluid Dynamics (CFD) method is developed using a meshfree collocation approach, or Generalized Finite Difference Method (GFDM), to resolve the evaporation phenomenon at the waterair interface since it is essential to estimate the water dry-out-time for corrosion protection schemes on automotive components. Thereby, the volume-volume-coupling to couple the phases -air and water -is used in order to keep a stable phase interface. At the interface, it is assumed that the main driving force of the liquid mass transfer into vapor is diffusion driven by the vapor concentration gradient. The automatized adaptive refinement based on the humidity-and velocity-gradient enabling the automation of the whole process is also developed. The newly developed method is validated with one simple and actual vehicle geometries. In vehicle geometry case, the total-dry-out times of an accumulated water source at the corner of a sunroof are measured. In order to extend the time scale of the simulation to real, the water reduction rate at the free surface is artificially accelerated once the evaporation rates are quasi stabilized. The validation results are promising, and the method could be extended into further complex vehicle applications.

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Determination of Diffusion Coefficient in Droplet Evaporation Experiment Using Response Surface Method

Cited by 8 publications

References 29 publications

Bio-coated surfaces with micro-roughness and micro-porosity: Next generation coatings for enhanced energy efficiency

Bio-coated surfaces with micro-roughness and micro-porosity: Next generation coatings for enhanced energy efficiency

Water droplet evaporation in varied gravity and electric fields

Water Evaporation CFD Method with the Meshfree Volume-Volume-Coupling Approach for Wet Automotive Component Dry-Out Time Prediction

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