Spray impingement cooling with single- and multiple-nozzle arrays. Part I: Heat transfer data using FC-72

Pautsch, Adam G.; Shedd, Timothy A.

doi:10.1016/j.ijheatmasstransfer.2005.02.012

Cited by 126 publications

(55 citation statements)

References 8 publications

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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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Section: Introductionmentioning

confidence: 99%

Evaporation of Droplets of Surfactant Solutions

Semenov

Trybała

Agogo³

et al. 2013

Langmuir

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“…On this account, when the surface temperature is high, the peak droplet flux impingement may not occur at the surface centre due to the expanded spray cone even the spray height is 25 mm. From the surface temperature distributions, it could be inferred that the droplets impingement is the primary heat transfer mechanism in the-non boiling regime of spray cooling as suggested in the previous studies [8,9]. …”

Section: Surface Temperature Distributionmentioning

confidence: 55%

Characterization of spray atomization and heat transfer for a swirl nozzle

Jinlong¹,

Zhao²,

Duan³

et al. 2024

RE&PQJ

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Abstract.Spray cooling, a high heat flux thermal management, has received great attention from modern industrial and technological applications, such as power electronics, high-power lasers, and conversion systems etc. The focus of the present work is to investigate the spray characteristics and heat transfer of a swirl nozzle under a low pressure drop range. An open loop spray cooling system is developed to examine the heat transfer performance of the swirl nozzle by considering the effects of nozzle pressure drop, impinged spray height. A Phase Doppler Anemometry (PDA) system is applied to characterize the droplet Sauter Mean diameter, droplet velocity, spray angle, and spray pattern. It is found that the swirl nozzle under lower pressure drop helps to generate a full cone spray with a smaller spray angle, while the higher pressure drop produces better atomization quality. The heat transfer experimental results indicate that the droplet impingement is the primary cooling mechanism in the nonboiling regime of spray cooling, and increasing the pressure drop generally improves the heat transfer performance.

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“…Figure 26 shows the effect of flowrate on spray cooling efficiency. This performance aspect represents the liquid usage efficiency, and that is defined as the ratio of the actual heat removed to the total heat capacity of the liquid used, including the required heat to bring the liquid from subcooled to saturation condition (sensible heat), and then to complete vaporization (latent heat) [48]. The spray cooling efficiency (η) can be found out using the following equation.…”

Section: Results For Steady Flow Spray Coolingmentioning

confidence: 99%