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An investigation on flow pattern, pressure drop, and holdup of cocurrent upward two‐phase flow in a vertical helical coil tube has been carried out with Newtonian and non‐Newtonian fluids. The flow patterns observed in the present study are divided into three main regimes, i.e. plug flow, slug flow, and stratified flow. Lockhart–Martinelli parameter (X) was used to predict the friction factor and...
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