Influence of Nanoparticles Shape on Natural Convection Mechanism In a Square Enclosure Using Single-phase Model: A Numerical Study

Abdullah Dağdeviren

Influence of Nanoparticles Shape on Natural Convection Mechanism In a Square Enclosure Using Single-phase Model: A Numerical Study

Abstract

This study numerically investigated the effects of different nanofluids and the added nanoparticle shapes types (brick, cylindrical, platelet, and spherical) and volumetric concentration (𝜑) on the average Nusselt number (Nuave) under natural convection (NC) conditions in a square enclosure. In case of Ra=103, the Nuave increased for all nanofluids (NFs) and shape types. The highest increase was observed with a 56.0% enhancement in the platelet shape of the GO/H2O NF in the 𝜑=5.0%. For all Ra values except Ra=103, the Nuave was generally observed to decrease as 𝜑 increased. For all Ra values and NP shapes, the SiO2/H2O NF exhibited the lowest Nuave values compared to the other NFs. It was emphasized that the use of spherical Al2O3, Fe3O4 and GO NPs provided significant improvements in heat transfer performance in systems operating at high Ra, and it was stated that SiO2-based NFs should be avoided in such applications.

Keywords

Nanoﬂuid , Heat transfer , Nanoparticle shape , Natural convection

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Details

Primary Language

English

Subjects

Energy Generation, Conversion and Storage (Excl. Chemical and Electrical) , Numerical Methods in Mechanical Engineering

Journal Section

Research Article

Authors

Abdullah Dağdeviren ^*
0000-0002-5418-4445
Türkiye

Publication Date

April 30, 2026

Submission Date

July 26, 2025

Acceptance Date

January 11, 2026

Published in Issue

Year 2026 Volume: 12 Number: 1

IZ

https://izlik.org/JA87WR44YT

IEEE

[1]A. Dağdeviren, “Influence of Nanoparticles Shape on Natural Convection Mechanism In a Square Enclosure Using Single-phase Model: A Numerical Study”, GJES, vol. 12, no. 1, pp. 1–14, Apr. 2026, [Online]. Available: https://izlik.org/JA87WR44YT

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