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Generalized Theory of Thermal Conductivity for Different Media: Solids to Nanofluids
Mohanachandran Nair Sindhu Swapna, Sankararaman S, 2019, izvirni znanstveni članek

Opis: The advent of nanotechnology in the 21st century opened a new branch of nanoscience known as nanofluids, finding a wide range of industrial applications especially in heat transfer. Though the theory of thermal conductivity of solids is well established, there is no such conclusive model to explain the thermal conductivity of nanofluids. In the present work we propose a generalized theory for thermal conductivity applicable to materials ranging from heterogeneous solids, porous materials, nanofluids, and ferrofluids. The model could explain the effective thermal conductivity of not only the combination of solids but also solid−fluid mixtures. The proposed theory could successfully link the existing models for porous solid materials and nanofluids as its special cases. The proposed model is verified against experimental data by simulating the theoretical equations
Ključne besede: thermal conductivity, generalised model, Sankar-Loeb model
Objavljeno v RUNG: 05.07.2022; Ogledov: 1323; Prenosov: 0
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Absolute Porosity Analysis in Carbon Allotropic Nanofluids: A Sankar–Swapna Model Approach
Mohanachandran Nair Sindhu Swapna, SREEJYOTHI S, Sankararaman S, 2020, izvirni znanstveni članek

Opis: Porous materials have gained significant attention in recent years as a class of material exhibiting interesting chemical and physical properties. The existing methods of porosity analysis have limitations that prevent absolute porosity measurement. Hence, a technique independent of surface physical properties alone can give the absolute porosity of the material. The porosity greatly influences the thermal diffusivity of a material. The manuscript is the first report of employing the Sankar–Swapna model for analyzing the porosity variations in carbon allotropic nanofluids. The model helps not only in getting information about the absolute porosity variations among samples, but also suggests morphological modifications through the thermal diffusivity study using the sensitive single-beam thermal lens technique. The variations in thermal diffusivity and absolute porosity values are also correlated to morphological modifications based on the theoretical model and thereby proposing this as a surrogate method for absolute porosity analysis.
Ključne besede: absolute porosity, Sankar–Swapna model, thermal diffusivity, thermal lens, thermal conductivity
Objavljeno v RUNG: 04.07.2022; Ogledov: 1378; Prenosov: 0
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