How do I calculate Reynolds number based on the feed cross-flow velocities for the various feed spacers?
A. The Sepa CF cell for use with high fouling spacer has a flow area width and height of 3.7 inches by 0.068 inches. Once a spacer material is placed in the channel the actual flow channel cross section is significantly reduced. We have not calculated that. We typically operate the cell and estimate the Reynolds number at the transition from laminar to turbulent flow by monitoring the increase in pressure drop as the crossflow is increased. Another usage implementation which we have used is the placement of a rubber gasket in the flow channel. A specifically sized flow channel can be cut out of the gasket to define a flow channel of the desired cross section. We actually have done more study of the CF cell for use with standard spacer (3.7 in. by 0.034 in. cell cross-section). We evaluated that cell for various cross flow velocities at various feed flow rates.
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