Thermally developing flow in elliptic ducts with axially variable wall temperature distribution

The laminar, incompressible, hydrodynamically fully developed and thermally developed and developing flow is studied in straight elliptic ducts with aspect ratio a * varying from 0.25 to 0.99 (which is an almost circular duct). The duct wall is subjected successively to constant temperature, to circ...

Full description

Saved in:
Bibliographic Details
Published in:International journal of heat and mass transfer 2002-01, Vol.45 (1), p.25-35
Main Authors: Sakalis, V.D., Hatzikonstantinou, P.M., Kafousias, N.
Format: Article
Language:English
Subjects:
Applied sciences
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Heat transfer
Theoretical studies. Data and constants. Metering
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The laminar, incompressible, hydrodynamically fully developed and thermally developed and developing flow is studied in straight elliptic ducts with aspect ratio a * varying from 0.25 to 0.99 (which is an almost circular duct). The duct wall is subjected successively to constant temperature, to circumferential uniform and axially linearly or exponentially varying temperature. Numerical results obtained with the ADI scheme indicate that the friction factor increases as aspect ratio a * decreases. In the thermally developing flow a high Nusselt number decreases as a * decreases. In the thermally developed limit as a * decreases, the Nusselt number increases for small axial wall temperature distributions, while decreases for large axial wall temperature values.
ISSN:0017-9310
1879-2189
DOI:10.1016/S0017-9310(01)00124-7