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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

COMPUTATIONAL MODELING OF SINGLE-PHASE LAMINAR FLOW HEAT TRANSFER IN COMPLEX PLATE-FIN DUCTS

Get access (open in a dialog) DOI: 10.1615/IHTC16.hte.024222
pages 5381-5388

要約

The enhanced convection heat transfer in a novel slotted trapezoidal profile converging-diverging plate-fin was investigated computationally. Results were obtained for constant property air flow (Pr = 0.72) in periodically developed, laminar forced convection at low Reynolds number (100 - 1000). A parametric study of plate-fin geometry was carried out to address effect of trapezoid inclination angle (φ), convergent-divergent ratio (α), and dimensionless wavelength (λ). Besides the surface area enlargement of the converging-diverging channel structure, it is seen to promote secondary flow mixing along with flow acceleration and deceleration. The novel design of slotted trapezoidal converging-diverging plate-fin, however, reduces the stagnation regions of the flow recirculation and the slotted surface transpiration in inter-fin passages promotes even greater mixing (wherein the cold core-flow fluid is displaced to the heated fin surface), besides effecting periodic interruption of the developing boundary layers at the fin surface. The consequent overall heat transfer performance, when evaluated for the fixed pressure drop constraint, relative to both the plain plate-fin and the unslotted trapezoidal converging-diverging plate-fin, is found to be significantly enhanced where α is seen to have the most profound influence on the performance.