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The "ideal" model corresponds to St = oo and is shown as σ^/q = 1 for all τ values. At large τ, the ratio is independent of r, supporting the earlier predictions of Snyder and Adler (1976b). 30 52 Henrik Pedersen and Csaba Horvath 1 Τ CORRELATION OF SNYDER AND ADLER (Nu - IS) ^ (IDEAL MODEL) (aSt)-' Fig. 24. Plot of the asymptotic values of as a function of l/(aSt) calculated by the two-region model [Eqs. (23) and (24)] and by the correlation of Snyder and Adler (1976b). Agreement is observed only for small values of l/(aSt).

30 by c u r v e s (a) and (b). 017. T h e segmentation and the t u b e coiling act synergistically to effect the radial m a s s transfer in laminar flow t h r o u g h t u b e s . E. Design and O p t i m i z a t i o n In o r d e r to achieve a high sensitivity a n d satisfactory linearity, it is ad­ vantageous to design e n z y m e r e a c t o r s so that the reaction is diffusion controlled.

U n d e r conditions such that the transport steps p r o c e e d infinitely fast. A s is c o m m o n in chemical engineering, the intrinsic p a r a m e t e r s and the effec­ tive rate are then related by introducing an effectiveness factor. F o r ex­ ample, if w e a s s u m e simple M i c h a e l i s - M e n t e n kinetics, t h e virtual max­ imum intrinsic rate, V k i n , is given by Vkin = V ^ a x 5 / ( / ^ n . + S) (2) w h e r e Vmax and c o r r e s p o n d to the immobilized e n z y m e and S is the bulk substrate concentration.

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