Dropwise cooling is a subject of interest for numerous industrial applications, which fosters fundamental research on the related mechanisms. The present work is focused on studying the cooling effect of two water droplets gently released onto a heated solid surface. The nominal initial temperature of the substrate was lower than 100 °C, thereby referring to evaporation regime. An experimental and numerical approach was employed to analyze heat-transfer phenomena both at the solid/liquid interface and over non-wetted regions, thus evaluating mutual interaction between droplets. Infrared thermography was used as the experimental technique: a facility was built to measure surface temperature from below through a fully non-intrusive approach. An infrared-transparent disk served as the solid substrate; its black-painted upper surface allowed heating and droplet deposition to occur on a blackbody. A numerical code was developed to model heat-transfer mechanisms within all bodies and at all interfaces, employing the finite-volume discretization method. Numerical results showed very good agreement with experimental temperature profiles and heat-flux distribution was predicted over the whole sampling region. Cooling effect was quantitatively determined, together with the extent of the mutual-interaction region, where the influence of a multi-droplet configuration was proved higher and longer with respect to a single-droplet one.

Experimental and numerical analysis of thermal interaction between two droplets in spray cooling of heated surfaces / Santangelo, Paolo Emilio; Corticelli, Mauro Alessandro; Tartarini, Paolo. - (2015). (Intervento presentato al convegno ASME-ATI-UIT 2015 Conference on Thermal Energy Systems: Production, Storage, Utilization and the Environment tenutosi a Napoli, Italia nel 17-20 maggio 2015).

Experimental and numerical analysis of thermal interaction between two droplets in spray cooling of heated surfaces

Paolo Emilio Santangelo;Mauro Alessandro Corticelli;Paolo Tartarini
2015

Abstract

Dropwise cooling is a subject of interest for numerous industrial applications, which fosters fundamental research on the related mechanisms. The present work is focused on studying the cooling effect of two water droplets gently released onto a heated solid surface. The nominal initial temperature of the substrate was lower than 100 °C, thereby referring to evaporation regime. An experimental and numerical approach was employed to analyze heat-transfer phenomena both at the solid/liquid interface and over non-wetted regions, thus evaluating mutual interaction between droplets. Infrared thermography was used as the experimental technique: a facility was built to measure surface temperature from below through a fully non-intrusive approach. An infrared-transparent disk served as the solid substrate; its black-painted upper surface allowed heating and droplet deposition to occur on a blackbody. A numerical code was developed to model heat-transfer mechanisms within all bodies and at all interfaces, employing the finite-volume discretization method. Numerical results showed very good agreement with experimental temperature profiles and heat-flux distribution was predicted over the whole sampling region. Cooling effect was quantitatively determined, together with the extent of the mutual-interaction region, where the influence of a multi-droplet configuration was proved higher and longer with respect to a single-droplet one.
2015
ASME-ATI-UIT 2015 Conference on Thermal Energy Systems: Production, Storage, Utilization and the Environment
Napoli, Italia
17-20 maggio 2015
Santangelo, Paolo Emilio; Corticelli, Mauro Alessandro; Tartarini, Paolo
Experimental and numerical analysis of thermal interaction between two droplets in spray cooling of heated surfaces / Santangelo, Paolo Emilio; Corticelli, Mauro Alessandro; Tartarini, Paolo. - (2015). (Intervento presentato al convegno ASME-ATI-UIT 2015 Conference on Thermal Energy Systems: Production, Storage, Utilization and the Environment tenutosi a Napoli, Italia nel 17-20 maggio 2015).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1184961
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