Numerical study of transient conjugated mixed convection in a vertical pipe

Journal Article · Mon Aug 01 04:00:00 EDT 1994 · Numerical Heat Transfer. Part A, Applications; (United States)

DOI:https://doi.org/10.1080/10407789408955986· OSTI ID:6840615

Lee, K T ^[1]; Yan, W M ^[2]

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1. Oriental Inst. of Tech., Taipei (China). Dept. of Mechanical Engineering
2. Hua Fan Inst. of Tech., Taipei (China). Dept. of Mechanical Engineering

This work deals with the problem of transient conjugated mixed convection heat transfer in a vertical pipe maintained at either uniform heat flux (UHF) or uniform wall temperature (UWT). The effects of the ratio of Grashof number to Reynolds number Gr/Re, conductivity ratio K, diffusivity ratio A, and dimensionless wall thickness [Delta] on the interfacial heat flux, velocity, and temperature profiles are discussed in detail. Three conditions of wall effects were examined, i.e., zero wall thickness (case A), effect of heat capacity (case B), and dual effects of heat capacity and wall conduction (case C). The prediction shows that the results of case C give a longer thermal larger than those of case B. Additionally, for the case of UWT, the time for the system to reach the steady state condition is indistinguishable for the system having K and A [>=] 100 or [Delta] [<=] 0.2.

• OSTI ID: 6840615
• Journal Information: Numerical Heat Transfer. Part A, Applications; (United States), Journal Name: Numerical Heat Transfer. Part A, Applications; (United States) Vol. 26:2; ISSN 1040-7782; ISSN NHAAES
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer &amp; Fluid Flow
CONVECTION
ENERGY TRANSFER
FLUID FLOW
HEAT TRANSFER
LAMINAR FLOW
MASS TRANSFER
ORIENTATION
PIPES
TRANSIENTS