Numerical analysis of natural convection in internally finned horizontal annuli

被引：0
作者：
Gao Q. [1 ,2 ]
Zhang K. [1 ,2 ]
Wang L.B. [1 ,2 ]
机构：
[1] School of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, Gansu
[2] Key Laboratory of Railway Vehicle Thermal Engineering of MOE, Lanzhou Jiaotong University, Lanzhou, 730070, Gansu
来源：
Frontiers in Heat and Mass Transfer | 2020年 / 14卷
基金：
中国国家自然科学基金;
关键词：
Annuli; Bifurcation; Natural convection; Numerical simulation; Rayleigh number;
D O I：
10.5098/hmt.14.29
中图分类号：
学科分类号：
摘要：
Detailed numerical analysis is presented for natural convection heat transfer in internally finned horizontal annuli. Governing equations are discretized using the finite volume method, and solved using SIMPLE algorithm with Quick scheme. The results show that the flow and heat transfer can reach steady state when the Rayleigh number is below 2×104. When the Rayleigh number is greater than 3×104, two different types of numerical solutions under the same parameters can be obtained for different initial conditions. The critical Rayleigh numbers with two different initial conditions are different from steady to unsteady solutions. The oscillatory flow undergoes several bifurcations and ultimately evolves to a chaotic flow as the Rayleigh numbers increase. © 2020, Global Digital Central. All rights reserved.
引用
收藏
页码：1 / 10
页数：9
相关论文
共 50 条
  • [31] Natural convection heat transfer over horizontal annular elliptical finned tubes
    Nemati, H.
    Moradaghay, M.
    Moghimi, M. A.
    Meyer, J. P.
    INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER, 2020, 118
  • [32] Numerical Analysis of Turbulent Flow and Heat Transfer in Internally Finned Tubes
    Liu, Zhanwei
    Yue, Yanwei
    She, Luchao
    Fan, Guangming
    FRONTIERS IN ENERGY RESEARCH, 2019, 7 (JUL):
  • [33] NATURAL CONVECTION HEAT TRANSFER IN CONCENTRIC HORIZONTAL ANNULI CONTAINING A SATURATED POROUS MEDIA
    Alfahaid, Ahmed F.
    Sakr, R. Y.
    Ahmed, M. I.
    IIUM ENGINEERING JOURNAL, 2005, 6 (01): : 41 - 54
  • [34] Numerical Simulation of Natural Convection in a Horizontal Enclosure with a Conducting Square Body
    Lee, Jae Ryong
    Ha, Man Yeong
    TRANSACTIONS OF THE KOREAN SOCIETY OF MECHANICAL ENGINEERS B, 2005, 29 (02) : 189 - 196
  • [35] CONJUGATED NATURAL CONVECTION IN HORIZONTAL ANNULI PARTIALLY FILLED WITH METALLIC FOAMS BY USING TWO-EQUATION MODEL
    Qu, Z. G.
    Xu, H. J.
    Tao, W. Q.
    JOURNAL OF POROUS MEDIA, 2013, 16 (11) : 979 - 995
  • [36] NUMERICAL ANALYSIS OF NATURAL CONVECTION IN A PRISMATIC ENCLOSURE
    Aich, Walid
    Hajri, Imen
    Omri, Ahmed
    THERMAL SCIENCE, 2011, 15 (02): : 437 - 446
  • [37] On the reduction of natural convection heat transfer in horizontal eccentric annuli containing saturated porous media
    Mota, JPB
    Saatdjian, E
    INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW, 1997, 7 (04) : 401 - +
  • [38] Experimental and numerical investigation of natural convection flows in two horizontal thermoacoustic cavities
    Hireche, Omar
    Ramadan, Islam
    Weisman, Catherine
    Bailliet, Helene
    Fraigneau, Yann
    Baltean-Carles, Diana
    Daru, Virginie
    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2020, 149
  • [39] Natural convection heat transfer from a finned sphere
    Singh, Bhajneet
    Dash, Sukanta K.
    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2015, 81 : 305 - 324
  • [40] Variable property solution for the natural convection in horizontal concentric annuli: Effect of the temperature difference ratio
    Cao, Yuhui
    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2017, 112 : 805 - 809
12345