Overview of Ionic Liquids as Candidates for New Heat Transfer Fluids
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Overview of Ionic Liquids as Candidates for New Heat Transfer Fluids Alina Adriana Minea1 Received: 4 August 2020 / Accepted: 12 August 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract This review discusses, in terms of practical aspects and future application, about heat transfer fluids properties with special focus on the possible use of ionic liquids in heat transfer applications. Even if some data were identified in the open literature, most of the ionic liquids studies on thermophysical properties are yet at the beginning and fully described chemicals are scarce. The most relevant thermophysical properties of ionic liquids (density, specific heat, thermal conductivity, and viscosity) are paralleled with the properties of several commercial heat transfer fluids. A consistent attention is paid to the analysis of heat transfer coefficient and friction factor, as well as Prandtl number. Concluding, ionic liquids can be seen as an alternative to regular heat transfer oils, however, a consistent experimental approach using real-life geometries and conditions is mandatory to be developed to fully understand all the processes. Keywords Heat transfer · Ionic liquids · Specific heat · Thermal conductivity · Viscosity
1 Heat Transfer Fluids—General Characteristics Fluids are crucial for most of the heat transfer processes. In the last years there is a tremendous need of enhancing thermal processes, especially with regard to finding new solutions that may favor the miniaturization of components for most of the thermal equipment. Another urgent need is to get higher heat transfer rates combined with higher energy conversion degrees. In terms of properties, a convenient heat transfer fluid needs to tackle:
This article is part of the Special Issue on Nanoparticle-enhanced Ionic Liquids. * Alina Adriana Minea [email protected] 1
Technical University “Gheorghe Asachi”, Iasi, Romania
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International Journal of Thermophysics
(2020) 41:151
• good heat transfer properties, • good thermal stability, making the heat transfer fluid operate in stable regime
for a number of heating–cooling cycles,
• low viscosity in the entire temperature working range, especially at process
• • • • • •
start-up (where usually the temperature is lower, thus viscosity is higher), in order to have a decreased pumping power (that reflects on the electrical energy consumption), low solidification temperature (to be able to safely permit extended stops in service), low corrosion of the heat transfer pipes and of the entire circuit, low toxicity, environment friendly characteristics, good initial price and reduced maintenance costs, provide safety for the workers, especially when accidental leaks may occur.
Another important fact that has to be considered is the life charge of the fluid. As a guidance, the practitioners recommend the under normal working conditions, with the appropriate maintenance operations and moving within the operation parameters of the chose
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