EFFICIENCY OF A LONGITUDINAL FIN WITH VARIATION OF HEAT TRANSFER COEFFICIENT ALONG THE FIN

Journal Article · Tue Jan 01 04:00:00 EST 1957 · J. Nuclear Energy

DOI:https://doi.org/10.1016/0891-3919(57)90029-3· OSTI ID:4330765

Melese, G

With a few simplifying assumptions, rt is possible to compute the efficiency of longitudinal fins of practically arbitrary shape even when the heat- transfer coefficient is signifrcantly greater at the tip than at the root of the fin. In such a case the efficiency is decreased compared to the case of a constant heat-transfer coeffrcient (equal to the mean value of the variable coefficient) and this decrease is comparatively larger for poor fin efficiencies. In principle, this decrease may reach 10 to 20% of the 'classical'' fin efficiency; but in practice, it may even be larger, when the fins are very close to each other, for instance. This case often happens in the cooling of nuclear power reactors by a gas, since the heat fluxes are important and the temperatures and coolant cross-section are limited. Nevertheless, the assumption of a constant coefficient is usually justified, since the fin efficiency is often only 10% or less smaller than the value found by the classical'' method (in most practical cases of rather efficient fins), in spite of the fact that experiments show the variation of the heat-transfer coefficient along the fin very seldom to be negligible. (auth)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-12-001346
• OSTI ID: 4330765
• Journal Information: J. Nuclear Energy, Journal Name: J. Nuclear Energy Vol. Vol: 5
• Country of Publication: Country unknown/Code not available
• Language: French

Related Subjects

CONFIGURATION
EFFICIENCY
ENGINEERING
EQUATIONS
FINS
GAS COOLANT
HEAT TRANSFER
MATHEMATICS
POWER PLANTS
REACTORS
VARIATIONS