Three-dimensional modelling of natural convection and entropy generation in a vertical cylinder under heterogeneous heat flux using nanofluids

บทความในวารสาร

ผู้เขียน/บรรณาธิการ

กลุ่มสาขาการวิจัยเชิงกลยุทธ์

ไม่พบข้อมูลที่เกี่ยวข้อง

รายละเอียดสำหรับงานพิมพ์

รายชื่อผู้แต่ง: Rashidi I., Kolsi L., Ahmadi G., Mahian O., Wongwises S., Abu-Nada E.

ผู้เผยแพร่: Emerald Group Publishing Ltd.

ปีที่เผยแพร่ (ค.ศ.): 2019

Volume number: 30

Issue number: 1

หน้าแรก: 119

หน้าสุดท้าย: 142

จำนวนหน้า: 24

นอก: 0961-5539

eISSN: 0961-5539

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85071523557&doi=10.1108%2fHFF-12-2018-0731&partnerID=40&md5=5e36ec7d011083e76037f289c3ec72cb

ภาษา: English-Great Britain (EN-GB)

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บทคัดย่อ

Purpose: This study aims to investigate a three-dimensional computational modelling of free convection of Al2O3 water-based nanofluid in a cylindrical cavity under heterogeneous heat fluxes that can be used as a thermal storage tank. Design/methodology/approach: Effects of different heat flux boundary conditions on heat transfer and entropy generation were examined and the optimal configuration was identified. The simulation results for nanoparticle (NP) volume fractions up to 4 per cent, and Rayleigh numbers of 104, 105 and 106 were presented. Findings: The results showed that for low Ra (104) the heat transfer and entropy generation patterns were symmetric, whereas with increasing the Rayleigh number these patterns became asymmetric and more complex. Therefore, despite the symmetric boundary conditions imposed on the periphery of the enclosure (uniform in Ɵ), it was necessary to simulate the problem as three-dimensional instead of two-dimensional. The simulation results showed that by selecting the optimal values of heat flux distribution and NP volume fraction for these systems the energy consumption can be reduced, and consequently, the energy efficiency can be ameliorated. Originality/value: The results of the present study can be used for the design of energy devices such as thermal storage tanks, as both first and second laws of thermodynamics have been considered. Using the optimal design will reduce energy consumption. © 2019, Emerald Publishing Limited.

คำสำคัญ

Non-uniform heat flux distribution, Three-dimensional modelling