Heat Transfer Capability of Ionanofluids for Heat Transfer Applications
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Heat Transfer Capability of Ionanofluids for Heat Transfer Applications Gabriela Huminic1 · Angel Huminic1 Received: 6 October 2020 / Accepted: 16 October 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Ionanofluids are mixtures of ionic liquid and solid particles with enhanced thermophysical properties. Using the properties of these ionanofluids (thermal conductivity, dynamic viscosity, specific heat, and density), a comprehensive analysis concerning their heat transfer capability was performed. Two nanomaterials, silicon carbide (SiC) and graphene dispersed in 1-hexyl-3-methylimidazolium tetrafluoroborate ([Hmim]SF4) were studied. Different equations (figures of merit) as a base of comparison for laminar and turbulent flows were used. The effects of concentration and temperature on the pumping power ratio were theoretically investigated. The results indicated that the studied ionanofluids can contribute to the enhancement of thermal performance, especially in laminar flow. Keywords Efficiency · Ionanofluid · Pumping power Nomenclature Variables cp Specific heat, J·(kg·K)−1 h Heat transfer coefficient, W·(m2·K)−1 k Thermal conductivity, W·(m·K)−1 Mo Mouromtseff number W Pumping power, W Greek symbols µ Dynamic viscosity, Pas ρ Density, kg·m−3 This article is part of the Special Issue on Nanoparticle-enhanced Ionic Liquids. * Gabriela Huminic [email protected] 1
Mechanical Engineering Department, Transilvania University of Brasov, 29, Bulevardul Eroilor, 500036 Brasov, Romania
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International Journal of Thermophysics
(2021) 42:12
Subscript INF Ionanofluid BF Base fluid L Laminar r Ratio T Turbulent Abbreviations [BMIM][BF4] f 1-Butyl-3-methylimidazolium tetrafluoroborate [C4mim][NTf2] 1-Butyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide [C4mpyrr][NTf2] N-Butyl-N-methylpyrrolidiniumbis(trifluoromethanesulfonyl) imide [C2mim][CH3SO3] 1-Ethyl-3-methylimidazolium methanesulfonate [EMIm]Ac) 1-Ethyl-3-methylimidazolium acetate [EMIM][DEP] 1-Ethyl-3-methylimidazolium diethylphosphate [Hmim]BF4 1-Hexyl-3-methylimidazolium tetrafluoroborate [N4111][NTf2] Butyltrimethylammoniumbis(trifluoromethylsulfonyl)imide FOM Figure-of-merit
1 Introduction Ionanofluids are mixtures of ionic liquid and solid particles with enhanced thermophysical properties (thermal conductivity and heat capacity) which may be used as alternative fluids both to conventional fluids and nanofluids, in order to improve heat transfer in thermal systems. In the last years, ionanofluids were used as working fluids in various solar applications (solar thermal collectors, solar heating systems). The first studies on ionanofluids were carried out by Ribeiro et al. [1]. Numerous studies afterward indicated and confirmed the significant features of these fluids. Thus, Zhang et al. [2] investigated the thermal conductivity, viscosity, heat specific capacity and heat transfer performance of the 1-ethyl-3-methylimidazolium acetate ([EMIm]Ac)–graphene
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