Pressure drop Bravo prediction

For ordered, or structured, packings, pressure-drop estimation methods have been reviewed by Fair and Bravo [Chem. Eng. Progr, 86(1), 19 (1990)]. It is not common practice to use the packing factor approach for predicting pressure drop or flooding. For operation below the loading point, the model of Bravo et al. [Hydrooarbon... 

Stiehlmair, J. Bravo, L. J. Fair, J. R. General Model for Prediction of Pressure Drops and Capacity of Countercurrent Gas/Liquid Packed Colluiims, Gas Separation Purification 3 (1989) No. 3, p. 19/28... 

Stichlmair, J., Bravo, J.L., and Fair, J.R. (1989), General model for prediction of pressure drop and capacity of countercurrent gas/liquid packed columns, Gas Separation Purification, 3(March) 19-28. 

A generalized method has been derived by Bravo et al to predict the pressure drop for structured packings [10]. Their predictive equation is ... 

A review of the methods for prediction of pressure drop through structured packings was published by Fair and Bravo in 1990 [11]. These authors recommend the use of the Bravo method below the loading point and the Stichlmair method for operations in the loading region. 

Fair, J. R. and Bravo, J. L., Prediction of Mass Transfer Efficiencies and Pressure Drop for Structured Tower Packings in Vapor/Liquid Service, University of Texas at Austin, 1987. 

The generalized method developed by Bravo et al can be used to predict the pressure gradient of structured packings (see Chapter 2) [3]. Normally vacuum towers are not operated in the loading region of the packing, due to the column pressure drop restriction. This correlation is based on data with C values as low as 0.05 ft/s. 

J. R. Fair, J. L. Bravo, Prediction of mass transfer efficiency and pressure drop of structured tower packings in vapour/liquid service", Inst Chem. Eng. Symp. Ser. 104, (1987) A183. 

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