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Q9. With reference to tubular heat exchangers explain:

a) How differential movement tubes and body is accommodated when the tube plates are rigidly located in the body,

b) How and why turbulence is imparted to fluid flow through the tubes,

c) Why it has become possible to discard sacrificial anodes in sea water coolers,

d) What is meant by the term ‘guided flow’, with particular reference to oil heaters.