Transport of solids produced with oil and gas is desired to avoid flow assurance problems. Stratified flow is a challenging flow regime for solids transport because the solids are trapped in the relatively slow-moving liquid film. Our analysis revealed discrepancies between predictions of existing multiphase models and experimental observations. Thus, we extended single-phase models to stratified flow, assuming solids transport in the liquid phase, by evaluating the input characteristic length scales. We considered four length scales, and compared the models' predictions with experimental observations. The models' predictions are most accurate when the liquid film height is used as input.

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