Forced convection of turbulent flow in triangular ducts with different angles and surface roughnesses

被引:30
|
作者
Leung, CW [1 ]
Wong, TT
Kang, HJ
机构
[1] Hong Kong Polytech Univ, Dept Mech Engn, Kowloon, Peoples R China
[2] Xi An Jiao Tong Univ, Sch Energy & Power Engn, Xian 710049, Peoples R China
关键词
D O I
10.1007/s002310050232
中图分类号
O414.1 [热力学];
学科分类号
摘要
The experimental investigations were consisting of two parts. The first part was carried out to study the effect of corner geometry on the steady-state forced convection inside horizontal isosceles triangular ducts with sharp corners. The electrically-heated triangular duct was used to simulate the triangular passage of a plate-fin compact heat exchanger. The isosceles triangular ducts were manufactured with duralumin, and fabricated with the same length of 2.4 m and hydraulic diameter of 0.44 m, but five different apex angles (i.e. theta(a) = 15 degrees,30 degrees, 40 degrees,60 degrees, and 90 degrees) respectively. The investigation was performed under turbulent flow condition covering a wide range of Reynolds number (i.e. 7000 less than or equal to Re-D less than or equal to 20000). It was found that the best thermal performance is achieved with the apex angle of 60 degrees. The second part was performed to investigate the effect of surface roughness on the forced convection of the same system. Horizontal equilateral triangular ducts with an apex angle of 60 degrees were fabricated with the same length and hydraulic diameter, but different , average surface roughnesses of 1.2 mu m, 3.0 mu m and 11.5 mu m respectively. It was concluded that the duct with a , higher surface roughness will have a better heat transfer performance. Non-dimensional expressions for the determination of the heat transfer coefficient of the triangular ducts with different apex angles and surface roughnesses were also developed.
引用
收藏
页码:63 / 68
页数:6
相关论文
共 50 条
  • [31] ANALYSIS OF UNSTEADY FORCED-CONVECTION IN TURBULENT DUCT FLOW
    SANTOS, CAC
    BROWN, DM
    KAKAC, S
    COTTA, RM
    JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER, 1995, 9 (03) : 508 - 515
  • [32] FORCED CONVECTION HEAT TRANSFER INSIDE TUBES - TURBULENT FLOW
    EVERETT, M
    TRANSACTIONS OF THE INSTITUTION OF CHEMICAL ENGINEERS AND THE CHEMICAL ENGINEER, 1969, 47 (07): : C159 - &
  • [33] SURFACE RENEWAL THEORY FOR TURBULENT MIXED CONVECTION IN VERTICAL DUCTS.
    Swanson, Larry W.
    Catton, Ivan
    1600, (30):
  • [34] Analysis of different RANS models applied to turbulent forced convection
    Jaramillo, J. E.
    Perez-Segarra, C. D.
    Oliva, A.
    Claramunt, K.
    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2007, 50 (19-20) : 3749 - 3766
  • [35] FRICTIONAL PRESSURE DROP IN LAMINAR AND TURBULENT FLOW IN ISOSCELES-TRIANGULAR DUCTS
    TIRUNARA.NA
    RAMACHAN.A
    MECHANICAL ENGINEERING, 1967, 89 (08) : 63 - &
  • [36] Numerical investigation of turbulent forced convection in ducts with rectangular and trapezoidal cross-section area by using different turbulence models
    Rokni, M
    Sunden, B
    NUMERICAL HEAT TRANSFER PART A-APPLICATIONS, 1996, 30 (04) : 321 - 346
  • [37] Turbulent forced convection heat transfer in triangular cross sectioned helically coiled tube
    Elashmawy, Mohamed
    Kolsi, Lioua
    INTERNATIONAL JOURNAL OF ADVANCED AND APPLIED SCIENCES, 2016, 3 (07): : 18 - 23
  • [38] FORCED CONVECTION TO LAMINAR FLOW OF LIQUID EGG YOLK IN CIRCULAR AND ANNULAR DUCTS
    Bernardi, M.
    Silveira, V., Jr.
    Telis, V. R. N.
    Gabas, A. L.
    Telis-Romero, J.
    BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING, 2009, 26 (02) : 287 - 298
  • [39] FORCED CONVECTION HEAT & MOMENTUM TRANSFER IN NEWTONIAN FLOW THROUGH DUCTS.
    Krishnamurty, V.V.G.
    Sidheswar, N.
    1600, (10):
  • [40] FORCED CONVECTION HEAT AND MOMENTUM-TRANSFER IN NEWTONIAN FLOW THROUGH DUCTS
    KRISHNAMURTY, VV
    SIDHESWAR, N
    INDIAN JOURNAL OF TECHNOLOGY, 1972, 10 (10): : 367 - 369