Dropwise cooling: Experimental tests by infrared thermography and numerical simulations

Tartarini, Paolo; Corticelli, Mauro Alessandro; Tarozzi, L.

doi:10.1016/j.applthermaleng.2008.06.011

Cited by 50 publications

(18 citation statements)

References 22 publications

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“…They could highlight differences in the temperature between the centre and the periphery of the droplet. In [20], the authors monitored the liquid-solid interface temperature after droplet impact through an infrared transparent material. They could confirm typical trends of droplet cooling and properly measure the distribution of temperature at the droplet-solid interface.…”

Section: State Of the Artmentioning

confidence: 99%

Sensible Heat Transfer during Droplet Cooling: Experimental and Numerical Analysis

et al. 2017

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This study presents the numerical reproduction of the entire surface temperature field resulting from a water droplet spreading on a heated surface, which is compared with experimental data. High-speed infrared thermography of the back side of the surface and high-speed images of the side view of the impinging droplet were used to infer on the solid surface temperature field and on droplet dynamics. Numerical reproduction of the phenomena was performed using OpenFOAM CFD toolbox. An enhanced volume of fluid (VOF) model was further modified for this purpose. The proposed modifications include the coupling of temperature fields between the fluid and the solid regions, to account for transient heat conduction within the solid. The results evidence an extremely good agreement between the temporal evolution of the measured and simulated spreading factors of the considered droplet impacts. The numerical and experimental dimensionless surface temperature profiles within the solid surface and along the droplet radius, were also in good agreement. Most of the differences were within the experimental measurements uncertainty. The numerical results allowed relating the solid surface temperature profiles with the fluid flow. During spreading, liquid recirculation within the rim, leads to the appearance of different regions of heat transfer that can be correlated with the vorticity field within the droplet.

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Section: State Of the Artmentioning

confidence: 99%

Sensible Heat Transfer during Droplet Cooling: Experimental and Numerical Analysis

et al. 2017

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“…The experimental method that is often used to make non intrusive thermal measurements during drop evaporation is infrared thermography (Savino and Fico 2004;Tarozzi et al 2007;Tartarini et al 2008;Tuckermann et al 2005;Wulsten and Lee 2008). The non-contact advantage of this technique enables the observation of the thermal phenomenon without any disturbance.…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, the liquid sample may be semi-transparent in some spectral measurement ranges, making it difficult to convert the measured radiance into surface temperature. Some authors (Tarozzi et al 2007;Tartarini et al 2008) observe the rear face of the plate on which the drop creates a layer. The 'drop side' of this transparent BaF 2 plate is coated with an opaque emissive paint, making it possible to measure its surface temperature which is also the temperature of the drop base.…”

Section: Introductionmentioning

confidence: 99%

Evaporation of Ethanol Drops on a Heated Substrate Under Microgravity Conditions

Brutin

Zhu

Rahli

et al. 2010

Microgravity Sci. Technol.

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We present in this paper results obtained from a parabolic flight campaign regarding ethanol sessile drop evaporation under reduced gravity conditions. Drops are created using a syringe pump by means of injection through a PTFE (polytetrafluoroethylene) substrate. The drops are recorded using a video camera and an infrared camera to observe the thermal motion inside the drop and on the heating substrate. The experimental set-up presented in this paper enables the simultaneous visualization and access to the heat flux density that is transferred to the drop using a heat flux meter placed between the heating block and the PTFE substrate. We evidence original thermal spreading phenomena during the ethanol drop creation on a heated PTFE substrate. The drop exhibits specific behaviour which is discussed here. This work is performed in the frame of a French-Chinese collaboration (project IM-PACHT) for future experiments in a Chinese scientific satellite.

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“…Infrared (IR) thermography has been recently explored as a high potential alternative to the intrusive measuring methods often used, based on thermocouples, which can provide important information on droplet impact under such particular boundary conditions [7][8][9]. However, many of these studies are focused on sessile droplets [10] or in particular boiling regimes such as the film boiling [11] where wettability plays a secondary role. Furthermore, care must be taken in the calibration and post-processing methods to obtain reliable measurements.…”

Section: Introductionmentioning

confidence: 99%

Time resolved thermographic analysis of droplet impacts onto heated surfaces under extreme wetting scenarios

Pontes

Teodori

Moita³

et al. 2017

Proceedings ILASS–Europe 2017. 28th Conference on Liquid Atomization and Spray Systems

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The present paper explores the use of time resolved infrared IR thermography combined with high-speed imaging to describe the liquid-surface interfacial heat transfer phenomena occurring at droplet/wall interactions. Custom made calibration and post-processing methods are proposed and discussed. The results show that the methodology proposed captures very well particular details on droplet dynamics and heat transfer, allowing to identify air bubble trapping at the impact region as well as the temperature variations at the formation of the rim. Furthermore, the calibration proposed here allowed amending some physically incorrect results that were often obtained with the IR camera's default calibration. The combined analysis of droplet dynamics (e.g. the spreading factor) with the radial temperature profiles, heat flux and cooling effectiveness computation allowed establishing qualitative and quantitative trends on the effect of various parameters on the heat transfer occurring at droplet/wall interactions. Particularly, the effect of the initial surface temperature is observed to play a minor role, as long as it is low enough to prevent the occurrence of boiling. On the other hand, extreme wetting scenarios, such as superhydrophobicity limit the heat transfer between the spreading droplet and the surface. However, the thermal analysis reveals that a major reason for this is not related to the reduced contact time of the droplet on the surface (due to rebound) or air entrapment, but is rather associated to the reduced wetted area caused by the high contact angles.

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Dropwise cooling: Experimental tests by infrared thermography and numerical simulations

Cited by 50 publications

References 22 publications

Sensible Heat Transfer during Droplet Cooling: Experimental and Numerical Analysis

Sensible Heat Transfer during Droplet Cooling: Experimental and Numerical Analysis

Evaporation of Ethanol Drops on a Heated Substrate Under Microgravity Conditions

Time resolved thermographic analysis of droplet impacts onto heated surfaces under extreme wetting scenarios

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