Abstract
In this paper, the relationship between the conveying pressure drop and
the gas velocity were firstly characterized based on pressure signal
analysis. The critical gas velocity was obtained to classify the
transfer bottle into stationary station and motion state, and pressure
fluctuation characteristics in each state were determined. Further,
derived from the traditional additional pressure drop method, the model
for pressure drop prediction was developed. The gas pressure drop was
further divided into four terms, including those in the conveying pipe,
through the sudden contraction from the pipe to the head of the transfer
bottle, through the sudden expansion from the end of the transfer bottle
to the pipe, and through the gap between the bottle and the pipe. The
solid-phase friction pressure drop was determined based on correctly
estimation of the dynamic friction coefficient.The model can
satisfactorily predict the pressure drop, giving errors mostly smaller
than ±10%.