Page 143 - Elements of Chemical Reaction Engineering 3rd Edition

Chap. 3 Questions and Problems 115

For crickets:

T ("C) 1 14.2 20.3 27.0
Chirpshin I 80 126 200

The running speed of ants and the flight speed of honeybees as a funtion of
temperature are given below [Source: B. Heinrich, "The Hot-Blooded Insects"
(Harvard University Press, Cambridge, MA, 1993)l.
For ants:

T ("C) 10 20 30 38
v (CWS) 0.5 2 3.4 6.5

For honeybees:

(a) What do the firefly and cricket have in common?
(b) What is the velocity of the honeybee at 4Q°C? At -5°C
(c) Do the bees, ants, crickets, and fireflies have anything in common? If so,
what is it? You may also do a pairwise comparison.
(d) Would more data help clarify the relationships among frequency, speed,
. and tlemperature? If so, in what temperature should the data be obtained?
Pick an insect and explain how you would carry out the experiment to
obtain more data.
P3-4, Corrosion of high-nickel stainless steel plates was found to occur in a distil-
lation column used at DuPont to separate HCN and water. Sulfuric acid is
always added at the top of the column to prevent polymerization of HCN.
Water collects at the bottom of the column and 14CN at the top. The amount
of corrosion on each tray is shown in Figure P3-4 as a function of plate loca-
tion in the column.

H2S04
Feed - HCN
15

15% HCN H2S04
85% H2O

1

Figure P3-4