Entropy analysis due to conjugate natural convection in water-Al2O3 nanofluid filled prismatic cavity

This paper investigates conjugate natural convection heat transfer inside a water–Al2O3 nanofluid filled prismatic cavity having thick bottom wall. The governing Navier-Stokes and energy equations are solved using Galerkin finite element method. The effects of three heating conditions (isothermally,...

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Bibliographic Details
Main Authors: Sagor, Md. Jahid Hasan, Hasan, Abul Borkot Md Rafiqul, Saha, Sumon
Format: Conference Proceeding
Language:English
Subjects:
Aluminum oxide
Conjugates
Entropy
Finite element method
Fluid dynamics
Fluid flow
Free convection
Heat transfer
Heating
Nanofluids
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Summary:This paper investigates conjugate natural convection heat transfer inside a water–Al2O3 nanofluid filled prismatic cavity having thick bottom wall. The governing Navier-Stokes and energy equations are solved using Galerkin finite element method. The effects of three heating conditions (isothermally, linearly-varying and sinusoidally varied temperature of the bottom wall) and different Raleigh numbers (103 ≤ Ra ≤ 107) on thermal field, flow field and entropy generation within the cavity have been depicted through isotherm, streamline and isentropic plots. Average Nusselt number along the top of the thick bottom wall and total entropy generation inside the cavity are also examined in order to estimate the influence of the above mentioned conditions. It is found that sinusoidal heating condition provides higher heat transfer rate for Ra ≥ 2×105.
ISSN:0094-243X
1551-7616
DOI:10.1063/5.0037522