文献类型：期刊文献

英文题名：Homogeneous Venturi-effect concentrators for creeping flows: Magnifying flow velocities and heat fluxes simultaneously

作者：Wang, Hao[1];Yao, Neng-Zhi[1];Wang, Bin[1];Shih, Tien-Mo[2];Wang, Xuesheng[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China;[2]Univ Calif Berkeley, Dept Mech Engn, Berkeley, CA 94720 USA

年份：2022

卷号：206

外文期刊名：APPLIED THERMAL ENGINEERING

收录：;EI(收录号：20220411499379);WOS:【SCI-EXPANDED(收录号:WOS:000774658900001)】；

语种：英文

外文关键词：Thermo-hydrodynamic concentrators; Homogeneous metamaterials; Venturi effects; Transformation heat transfer; Creeping flows; Porous media

摘要：Although thermal metamaterials have received considerable attention for approximately a decade, previous studies have so far focused on heat conduction or thermal convection in porous media, hampering applications related to moving in media. Based on transformation heat transfer, here we have analytically designed Venturi effect concentrators by simultaneously manipulating the dynamic viscosity and the thermal conductivity. Further based on this theory and integral median theorem, inhomogeneous concentrators metamaterials simplified to homogeneous counterparts are proposed. Noteworthily, the proposed method can be employed to simplify not only thermal metamaterials, but also other inhomogeneous metamaterials, such as optical metamaterials, electromagnetic metamaterials, acoustic metamaterials, among others. Numerical simulations demonstrate that these Venturi-effect concentrators can not only amplify both flow velocities and heat fluxes in thermal-flow fields, but also achieve cloaking effects in thermal-flow systems. Since these Venturi-effect concentrators do not interfere with the thermal-flow field outside the concentrators, they secure advantages over conventional Venturi tubes and will facilitate potential applications related to Venturi effects.