Hatta number modified

Situation 2 slow chemical reaction, Ho<0.3, = 1. The Hatta number is small, and thus the chemical reaction does not modify the mass transfer process and consequently, E 1. However, the chemical reaction is not so slow compared to the mass transfer rate. The hydrogen concentration in the bulk is smaller than the equilibrium concentration. The substrate concentration A is constant in the film and is almost that in the bulk. The consumption of H2 and A is negligible in the film and takes place in the bulk of the liquid. The reactor performances are obtained straightforwardly (see below). The mass transfer rate is obtained by /H LfCfJ.i-CH.L)-... 

This group is usually designated as a modified Hatta number Ha to distinguish it from the original Hatta number Ha (see Chapter 14) which does not include... 

Modified Hatta number (with a microphase) defined by Equation 23.25. 

The Flatta number is the ratio of the reaction in the liquid surface/mass transfer into the bulk phase or a modified Thiele modulus for GL systems to correct the mass transfer for chemical reaction. Because the ratio involves the reaction rate, the actual form of the Hatta number depends on the reaction kinetics. For first order reactions. 

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