A numerical investigation has been undertaken to study fluid flow and heat transfer through ducts roughened by arrays of either attached or detached ribs. The numerical approach used in this work is the finite-volume method. For the modeling of turbulence, the Launder & Sharma low-Re κ―ε model has been employed. This model has been used with the form of the length-scale correction term to the dissipation rate originally proposed by Yap and also more recently developed differential version, NYP. The mean flow predictions show that the low-Re κ―ε model can successfully capture the distribution of measured stream-wise velocity component close to the wall, but fail to predict it in the core region. The heat transfer predictions indicate that the replacement of the Yap correction term with the differential version improves the heat transfer predictions of the low-Re k κ―ε model.
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