Laminar Flow Heat Transfer Through Ribbed Ducts with Wire Coil Inserts
S. K. Saha1 and G. L. Dayanidhi2
1Professor, Mechanical Engineering Department, Bengal Engineering and Science University, Shibpur, Howrah 711 103, India.
sujoy_k_saha@hotmail.com
2Graduate Student, Mechanical Engineering Department, Bengal Engineering and Science University, Shibpur,
Howrah 711 103, India.
dayanidhi.rao@gmail.com
ABSTRACT
The heat transfer characteristics of laminar flow of servotherm medium oil (195 < Pr < 525) through rectangular and square ducts with internal transverse rib turbulators on two opposite surfaces of the ducts and with wire coil inserts have been studied experimentally. Circular duct has also been used. The transverse ribs in combination with wire coil inserts have been found to perform better than either ribs or wire coil inserts acting alone. The thermal characteristics are governed by duct aspect ratio, coil helix angle and wire diameter of the coil, rib height and rib spacing, Reynolds number and Prandtl number.
Keywords: Augmentation, Enhancement, Forced convection, Laminar, Ribs, Wire-coil inserts.
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