@article{MAKHILLJEAS2018131716749,
    title = {Numerical Investigation of Heat Transfer Enhancement in Ribbed Elliptical Passage},
    journal = {Journal of Engineering and Applied Sciences},
    volume = {13},
    number = {17},
    pages = {7223-7234},
    year = {2018},
    issn = {1816-949x},
    doi = {jeasci.2018.7223.7234},
    url = {https://makhillpublications.co/view-article.php?issn=1816-949x&doi=jeasci.2018.7223.7234},
    author = {Mohammed W.,Farhan Lafta and},
    keywords = {Heat transfer,enhancement,internal cooling,gas turbine,rib,turbulator cooling},
    abstract = {This study presents a numerical investigation for heat transfer enhancement and fluid flow in elliptical
and circular passages equipped with circular ribs having triangular cross section. Boundary conditions are inlet
coolant air temperature is 300 K with Reynolds numbers (Re = 7901). The surrounding constant hot air
temperatures was (673 K). The numerical simulations were done by using Software FLUENT Version 15 in this
part, it was presented the effect of using circular ribs in circular and elliptical passage channel on the fluid flow
and heat transfer characteristics. Ribs used with pitch-rib height of 10, circular passage of 36 mm internal
diameter and elliptical passage of 46×26 mm, 1.5 mm passage thickness and 0.5 m long. The temperature, velocity
distribution contours, cooling air temperature distribution at the passage centerline, the inner wall surface
temperature of the duct and thermal performance factor, the turbulent Eddy dissipation and turbulent kinetic
energy are presented in this study. Passage with ribs was the better case which leads to increase the coolant
air temperature by 9.1% for circular passage and 5% for elliptical passage, the temperature at the exit of
centerline passage is greater than the elliptical passage by 3.96%. The turbulent Eddy dissipation for ribbed
circular passage be higher than for ribbed elliptical passage by 100%. The values of turbulent kinetic energy
for ribbed circular passage be larger than that for elliptical passage by 300% at the exist. The enhancement
performance factor for ribbed circular passage be higher than that for elliptical one 120%. The higher friction
factor ratio was found for elliptical cross section passage with ribs. Circular cross section with ribs is the best
result (lower pressure drop and higher heat transfer enhancement).}
    }