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Q8. i) What is the basic function of heat exchanger? (3)

ii) Draw a line diagram showing the temperature gradient between the fluids at an intermediate heat conductive wall of a heat exchanger. (3)

iii) Explain with respect to flow pattern a parallel flow: (10)

a) i) parallel flow, ii) contraflow

b) i) turbulent flow, ii) streamline flow (for liquid inside tubes)