Natural convection in nanofluid enclosure under magnetic field:Entropy generation and economic analysis  

作　　者：Jiang-Tao Hu Shuo-Jun Mei 

机构地区：[1]School of Atmospheric Sciences,Sun Yat-sen University,Zhuhai 519082,China [2]School of Civil Engineering,Central South University of Forestry and Technology,Changsha 410004,China [3]Hunan Province Key Laboratory of Engineering Rheology,Central South University of Forestry and Technology,Changsha 410004,China [4]Key Laboratory of Tropical Atmosphere-Ocean System(Sun Yat-sen University),Ministry of Education,Zhuhai 519000,China

出　　处：《Propulsion and Power Research》2024年第2期273-293,共21页推进与动力（英文）

基　　金：financially supported by the Natural Science Foundation of Hunan Province (Grant No.2021JJ41082);the Research Foundation of Education Bureau of Hunan Province (Grant No.21B0231).

摘　　要：This study investigates the unsteady natural convection and entropy generation under the effects of magnetic field and baffles inside a nanofluid filled E-shaped enclosure.The nanofluid flow is driven by time-varying sidewall temperature and is partitioned by baffles.Multiple factors are discussed,including the enclosure aspect ratio(0.2≤AR≤0.7),nanofluid volume fractions(0≤φ≤0.1),Hartmann numbers(0≤Ha≤80),frequency of time-varying side wall temperature(0.01≤ω≤0.1),baffle locations(0≤d≤0.4)and length(0≤l≤0.4).An economic analysis is conducted to show the nanofluid cost of enhancing thermal transfer and reducing entropy generation.The modelling results show that increasing aspect ratio and nanofluid volume fraction enhance the thermal transfer behavior,while the magnetic field suppresses the nanofluid natural convection.Total entropy generation monotonically decreases with the increasing nanofluid volume fraction and Hartmann number.Installing baffles into horizontal walls can boost the thermal transfer behavior and decrease the total entropy generation.

关 键 词：Conjugated heat transfer Economic analysis Entropy generation Time-varying sidewall temperature MAGNETICFIELD 

分 类 号：O35[理学—流体力学]