Isokinetic probe sampling from slurry pipelines

A theoretical and experimental study of the errors arising in sampling through probes projecting into the flow has been conducted. Water–sand slurries with particles of surface‐mean diameter between 0.165 and 0.72 mm were considered. Theoretical predictions were performed assuming the mixture could be described by the axisymmetric potential flow relationship. Satisfactory agreement in the important intermediate K value region was achieved for tapered or thin‐walled probes. However, significant errors arise when thick‐walled blunt probes are used.