Publicado 8 números por año
ISSN Imprimir: 1065-5131
ISSN En Línea: 1563-5074
Indexed in
Numerical Investigation of Laminar Flow and Heat Transfer in Internally Finned Tubes
SINOPSIS
A numerical investigation of laminar mixed convection developing flow and heat transfer with variable viscosity in internally finned tubes with helical fins and constant wall temperature boundary condition was performed. The numerical model was validated by comparison with experimental data and was able to predict experimentally measured friction factors and Nusselt numbers with an accuracy of ± 10% for a wide range of fin geometries and operating conditions. A parametric study was conducted for fin geometry ranges of 8 ≤ N ≤ 54,0.03 ≤ H ≤ 0.1, and 0 ≤ γ ≤ 45 degrees, where N is the number of fins, H is the non-dimensional fin height, and γ is the fin helix angle. The ranges of operating condition were 102 ≤ Rein ≤ 103, 50 ≤ Prin ≤ 1,000, 0 ≤ Rain ≤ 106, and − 30 ≤ Δ T ≤ 30 K, where ΔT is the wall-to-inlet temperature difference. The model provided local information that supplemented length-averaged experimental results, particularly revealing that coring (higher velocities in the core of the tube and retarded velocities in the inter-fin region) is responsible for poor heat transfer performance of the tubes with large number of fins. The magnitude of this coring was exaggerated as the number of fins was increased but was about the same for both heating and cooling situations. The length-averaged results indicated that large heat transfer enhancement can be obtained for short non-dimensional lengths.
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