Ključne besede: Absolute porosity · Sankar–Loeb model · Ceria nanofuid · Thermal lens Absolute porosity · Sankar–Loeb model · Ceria nanofuid · Thermal lens techniqueObjavljeno v RUNG: 05.07.2022; Ogledov: 719; Prenosov: 0Gradivo ima več datotek! Več...
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 equationsKljučne besede: thermal conductivity, generalised model, Sankar-Loeb modelObjavljeno v RUNG: 05.07.2022; Ogledov: 724; Prenosov: 0Gradivo ima več datotek! Več...
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 conductivityObjavljeno v RUNG: 04.07.2022; Ogledov: 667; Prenosov: 0Gradivo ima več datotek! Več...