Enhancement of heat exchanges on a condenser using an air flow containing water droplets

Boulet, Pascal; Tissot, Julien; Trinquet, F.; Fournaison, Laurence

doi:10.1016/j.applthermaleng.2012.08.039

Cited by 27 publications

(10 citation statements)

References 7 publications

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“…The air pressure inside of the chamber, temperatures T s (substrate) and T ∞ (chamber wall), as well as the initial droplet geometry (L 0 and θ 0 ) were chosen as in three particular experiments: (1) The computational process is started with a preheating stage (20 sec), as in experiments, to set the temperature field in the chamber. During this stage the droplet evaporation, as well as liquid and gas flow, are switched off numerically.…”

Section: E Computational Proceduresmentioning

confidence: 99%

“…Evaporating sessile drops of simple and complex fluids are widely encountered in nature and have a great diversity of actual and potential applications. They include heat exchangers [1], patterns of nanoparticles deposition from evaporation of sessile drops (coffee-ring effect) [2,3], spraying of herbicides and pesticides on hydrophobic leaves [4], inkjet printing [5,6], microlens manufacturing [7], biological tissue engineering [8], and other biomedical applications (e.g., blood analysis [9,10] and surfactant replacement therapy [11]). Due to a wide range of applications, sessile drops have been the subject of extensive experimental and theoretical studies, and still remain an interesting problem from both scientific and industrial points of view.…”

Section: Introductionmentioning

confidence: 99%

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Boundary conditions for a one-sided numerical model of evaporative instabilities in sessile drops of ethanol on heated substrates

et al. 2017

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The work is focused on obtaining boundary conditions for a one-sided numerical model of thermoconvective instabilities in evaporating pinned sessile droplets of ethanol on heated substrates. In the one-sided model, appropriate boundary conditions for heat and mass transfer equations are required at the droplet surface. Such boundary conditions are obtained in the present work based on a derived semiempirical theoretical formula for the total droplet's evaporation rate, and on a two-parametric nonisothermal approximation of the local evaporation flux. The main purpose of these boundary conditions is to be applied in future three-dimensional (3D) one-sided numerical models in order to save a lot of computational time and resources by solving equations only in the droplet domain. Two parameters, needed for the nonisothermal approximation of the local evaporation flux, are obtained by fitting computational results of a 2D two-sided numerical model. Such model is validated here against parabolic flight experiments and the theoretical value of the total evaporation rate. This study combines theoretical, experimental, and computational approaches in convective evaporation of sessile droplets. The influence of the gravity level on evaporation rate and contributions of different mechanisms of vapor transport (diffusion, Stefan flow, natural convection) are shown. The qualitative difference (in terms of developing thermoconvective instabilities) between steady-state and unsteady numerical approaches is demonstrated.

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Section: E Computational Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Boundary conditions for a one-sided numerical model of evaporative instabilities in sessile drops of ethanol on heated substrates

et al. 2017

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“…Evaporation of liquid droplets in a gas volume has implications in different areas: spray drying and production of fine powders [1][2][3], spray cooling [4][5][6], fuel preparation [7-10], air humidifying [11], heat exchangers [12], drying in evaporation chambers of air conditioning systems [11,12], fire extinguishing [13,14], fuel spray auto ignition (Diesel) [15], solid surface templates from evaporation of nanofluid drops (coffee-ring effect) [16], spraying of pesticides [1][2][3], painting, coating and inkjet printing [17], printed MEMS devices, micro lens manufacturing, spotting of DNA microarray data [3,[18][19]. Because of such wide range of industrial applications this phenomenon has been under investigation for many years, both for pure fluids and for complex fluids.…”

Section: Introductionmentioning

confidence: 99%

Evaporation of Droplets of Surfactant Solutions

Semenov

Trybała

Agogo³

et al. 2013

Langmuir

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The simultaneous spreading and evaporation of droplets of aqueous trisiloxane (superspreader) solutions onto a hydrophobic substrate has been studied both experimentally, using a video-microscopy technique, and theoretically. The experiments have been carried out over a wide range of surfactant concentration, temperature and relative humidity. Similar to pure liquids, four different stages have been observed: the initial one corresponds to spreading till the contact angle, θ, reaches the value of the static advancing contact angle, θad. Duration of this stage is rather short and the evaporation during this stage can be neglected. The evaporation is essential during next three stages.The next stage after the spreading, which is referred to below as the first stage, takes place at constant perimeter and ends when θ reaches the static receding contact angle, θr. During the next, second stage, the perimeter decreases at constant contact angle θ=θr for surfactant concentration above critical wetting concentration (CWC). The static receding contact angle decreases during the second stage for concentrations below CWC because the concentration increases due to the evaporation. During the final stage both the perimeter and the contact angle decrease till the drop disappears. Below we consider only the longest stages one and two.The developed theory predicts universal curves for the contact angle dependency on time during the first stage, and for the droplet perimeter on time during the second stage. A very good agreement between theory and experimental data has been found for the first stage of evaporation, and for the second stage for concentrations above CWC, however, some deviations were found for concentrations below CWC.3

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“…These studies have primarily reported the influence of the segmentation ratio (i.e., the ratio between the lengths of each segment) on enhancing the heat transfer inside microchannels [9,10]. Moreover, other studies have applied non-dimensional analysis to describe the observed experimental behavior of such systems [11,12,13,14]. For Considering liquid−liquid flows, several studies have considered coupled thermal and hydrodynamic effects.…”

Section: Introductionmentioning

confidence: 98%

Thermal analysis of droplet flow: Numerical, analytical and experimental investigations

Romano

Guillaument

Hany

et al. 2015

Applied Thermal Engineering

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Enhancement of heat exchanges on a condenser using an air flow containing water droplets

Cited by 27 publications

References 7 publications

Boundary conditions for a one-sided numerical model of evaporative instabilities in sessile drops of ethanol on heated substrates

Boundary conditions for a one-sided numerical model of evaporative instabilities in sessile drops of ethanol on heated substrates

Evaporation of Droplets of Surfactant Solutions

Thermal analysis of droplet flow: Numerical, analytical and experimental investigations

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