Published 8 issues per year
ISSN Print: 1065-5131
ISSN Online: 1563-5074
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AMPHIPHILIC ADDITIVES TO ENHANCE POOL BOILING HEAT TRANSFER IN CONFINED SPACES
ABSTRACT
Boiling heat transfer with pure fluids deteriorates significantly under downward-facing heater (−1g) and in narrow gaps/confined spaces where surface tension dominates over buoyancy. The addition of amphiphilic additives such as surfactants and ionic liquids in water is well known to enhance boiling heat transfer under the downward-facing heater. However, the potential of amphiphilic additives to enhance boiling heat transfer in confined spaces is not explored much in the literature. In this work, confined pool boiling experiments were performed with aqueous surfactant solutions under various subcoolings, heater orientations, and confinement gaps (0.2 mm to 2.8 mm). Results are compared with corresponding experiments with pure water. In comparison to water, where bubble coalescence was prevalent in confined spaces, aqueous surfactant solutions suppressed coalescence and facilitated bubble removal sideways away from the heater surface, increasing the wetted area. This phenomenon with surfactant solutions was observed at all orientations that enhanced heat transfer in comparison to water. A maximum of 120% increase in heat transfer coefficient (HTC) and 280% increase in critical heat flux with surfactant was observed in comparison to the baseline case of pure water. Further, we demonstrated boiling heat transfer performance in a closed confined chamber, where significant enhancement in HTC was observed with the aqueous ionic liquid solution in comparison to water. We believe the results presented in this work can be utilized to develop boiling-based miniaturized thermal management and energy systems.
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