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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

HEAT TRANSFER INTENSIFICATION BY SURFACE STRUCTURATION IN SPRAY COOLING

Nadia Caney
Univ. Grenoble Alpes, LEGI, F-38000 Grenoble, CNRS, LEGI, F-38000 Grenoble, France

Wahid Cherief
Univ. Grenoble Alpes, LEGI, F-38000 Grenoble, CNRS, LEGI, F-38000 Grenoble, France

María Cristina Riofrío
Univ. Grenoble Alpes, LEGI, F-38000 Grenoble, CNRS, LEGI, F-38000 Grenoble, France

Jean-Antoine Gruss
Univ. Grenoble Alpes, F-38000 Grenoble, France, CEA, LITEN, F-38054 Grenoble, France

Francesc Madrid-Lozano
Univ. Grenoble Alpes, LEGI, F-38000 Grenoble, CNRS, LEGI, F-38000 Grenoble, France; Univ. Grenoble Alpes, F-38000 Grenoble, France, CEA, LITEN, F-38054 Grenoble, France

DOI: 10.1615/IHTC16.bae.021801
pages 631-638


キーワード: Two-phase/Multiphase flow, Heat transfer enhancement, Spray Cooling, Heat Transfer Enhancement, Structuration, Weckability

要約

The requirements for heat dissipation on electronic components keep growing. Cooling technologies have evolved from simple convection cooling systems to technologies involving the use of two-phase refrigerants.
Spray cooling is an efficient cooling process based on the breaking up of a coolant fluid in a cloud of droplets, impacting a solid hot surface. Spray cooling has several advantages compared to other technologies such as: high heat flux removal capacity for a low fluid flow; low superheat of incipience of boiling, low sensibility to strong accelerations and high critical heat flux. However, spray cooling is not easy to apprehend, due to the influence of multiple interconnected physical phenomena. A structured surface can influence the nature and behaviour of phase change phenomena, and improve spray cooling performances. The aim of this study is to enhance spray cooling performances of a very wetting fluid by different surface structurations.
An experimental facility with spray cooling using HFE-7100 as working fluid has been designed to obtain experimental results with smooth and structured surfaces. The fluid enters at the top of the test section and is subsequently sprayed on a horizontal surface. A specific instrumentation supplies local heat transfer coefficient. The results show a significant improvement (more than 100%) on heat transfer coefficient and critical heat flux in spray cooling with structured surfaces.

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