Two designs meet heat transfer performance requirement for a fluid stream (fluid 1) in a plate heat.

Two designs meet heat transfer performance requirement for a
fluid stream (fluid 1) in a plate heat exchanger: (1) a 1-pass 1-pass design
(see Fig. 1.65a) with 10 flow channels for fluid 1 and 11 fluid channels for
fluid 2, and (2) a series flow arrangement (see Fig. 1.65f ) with seven flow
channels for fluid 1 and eight flow channels for fluid 2. If the flow is fully
developed turbulent in both designs (i.e., f is about the same), the pressure
drop ratio for fluid 1 for design 2 to design 1 is approximately:

(a) 0.7 (b) 0.49 (c) 100 (d) 700 (e) 343 (f ) 1.43