Abstract
Based on measured pressure drop data (91 points), an attempt is made to use the Robertson-Stiff rheological model for estimating the pressure drop for annular single-phase flow. The model parameters A, B, and C, are calculated using the Golden Section Search Method. The pressure drop equation derived by Aswad and Saleh, in terms of the model parameters, has been used for laminar flow. For turbulent flow, a new friction factor correlation is proposed, which represents a generalization of the Caetano et al. equation for Newtonian fluids. In addition to the present data bank, used in the development of the proposed friction factor, another set of data from the Middle East are used for comparison purposes. It is observed based on statistical results that the laminar and turbulent flow equations described by the Robertson-Stiff model show excellent results and clearly outperform the two popular models, the Bingham plastic and the power law.
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