Open AccessHeat transfer performance of nano-suspension of Al 2 O 3 in ([C4mim][NT f2]) ionic liquid around a circular cylinder
Author(s) -
S. Rupesh,
R. Deepak Selvakumar
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/577/1/012004
Subject(s) - nusselt number , nanofluid , heat transfer , materials science , thermodynamics , heat transfer enhancement , convective heat transfer , reynolds number , laminar flow , cylinder , film temperature , churchill–bernstein equation , heat transfer coefficient , forced convection , mechanics , physics , turbulence , mechanical engineering , engineering
IoNanofluids are a new category of heat transfer fluids synthesized by suspending fine nanoparticles in ionic liquids. These IoNanofluids show superior heat transfer characteristics than conventional nanofluids and are more suitable for medium to high temperature applications. In this study, a numerical analysis of heat transfer performance of nano-suspension of Al 2 O 3 in ([ C 4 mim ][ NT f 2]) ionic fluid around a circular cylinder has been presented. A 2 − D , laminar, steady and forced convective flow around a hot circular cylinder at a constant temperature has been taken into account at 10 ≤ Re ≤ 40 and 0 % ≤ φ ≤ 2.5 %. Governing equations of flow and heat transfer are solved using SIMPLE algorithm based Finite Volume Method (FVM). An unique aspect of this study is the consideration of the influence of temperature on the thermo-physical properties of the IoNanofluids. Heat transfer characteristics are quantified in terms of mean Nusselt numbers and the thermal field around the circular cylinder has been visualized using isotherms. Influence of flow Reynolds number, particle volume fraction and inlet temperature over the local and mean Nusselt numbers has been discussed in detail. Evidently, increase in flow velocity and addition of nanoparticles resulted in heat transfer augmentation. Additionally, heat transfer performance of Al 2 O 3 − ([ C 4 mim ][ NT f 2]) IoNanofluid is compared with the conventional Al 2 O 3 − H 2 O nanofluid. Comparatively, IoNanofluids outperformed conventional water based nanofluids with 59 % higher heat transfer enhancement ratios. Also, the heat transfer enhancement ratios were noted to be higher at high temperatures. Thus, the new class of cooling liquids (IoNanofluids) are promising working fluids for advanced real time high temperature engineering applications.