A new, non-intrusive method is proposed to measure the solid-liquid contact temperature during dropwise evaporative cooling. The droplets are deposited onto a material, BaF2, which is transparent in the infrared spectral band. The transparent tile is coated with a very thin layer of high-emissivity, opaque paint on its upper side, so that it can effectively respond to the infrared camera below. The interface temperature can thus be measured through the solid material by a thermographic camera. Tests are carried out on the black painted BaF2 disk after its optimization by mechanical machining. The experimental tests are conducted following two deposition procedures: a) multi-droplet arrays, b) sprays. The two different behaviors and the corresponding cooling results are finally compared.

Droplets wall interaction: Measurement of the interface temperature through infrared-transparent media / Tartarini, Paolo; Santangelo, Paolo Emilio; Tarozzi, Luca. - (2006). ((Intervento presentato al convegno DITICE Workshop “Drop/wall interaction: Industrial applications, Experiments and Modeling” tenutosi a Bergamo, Italia nel 18-19 maggio 2006.

Droplets wall interaction: Measurement of the interface temperature through infrared-transparent media

Paolo Tartarini;Paolo Emilio Santangelo;Luca Tarozzi
2006

Abstract

A new, non-intrusive method is proposed to measure the solid-liquid contact temperature during dropwise evaporative cooling. The droplets are deposited onto a material, BaF2, which is transparent in the infrared spectral band. The transparent tile is coated with a very thin layer of high-emissivity, opaque paint on its upper side, so that it can effectively respond to the infrared camera below. The interface temperature can thus be measured through the solid material by a thermographic camera. Tests are carried out on the black painted BaF2 disk after its optimization by mechanical machining. The experimental tests are conducted following two deposition procedures: a) multi-droplet arrays, b) sprays. The two different behaviors and the corresponding cooling results are finally compared.
DITICE Workshop “Drop/wall interaction: Industrial applications, Experiments and Modeling”
Bergamo, Italia
18-19 maggio 2006
Tartarini, Paolo; Santangelo, Paolo Emilio; Tarozzi, Luca
Droplets wall interaction: Measurement of the interface temperature through infrared-transparent media / Tartarini, Paolo; Santangelo, Paolo Emilio; Tarozzi, Luca. - (2006). ((Intervento presentato al convegno DITICE Workshop “Drop/wall interaction: Industrial applications, Experiments and Modeling” tenutosi a Bergamo, Italia nel 18-19 maggio 2006.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11380/1184932
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