Heat Transfer
Nusselt number is the ratio of the

None of these
Temperature difference to the temperature gradient at the wall
Heat flux at the wall to that across the entire pipe
Temperature gradient of the wall to that across the entire pipe

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Heat Transfer
A process stream of dilute aqueous solution flowing at the rate of10 Kg.s⁻¹ is to be heated. Steam condensate at 95°C is available for heating purpose, also at a rate of 10 Kg.s⁻¹. A 1 - 1 shell and tube heat exchanger is available. The best arrangement is

Counter flow with process stream on shell side
Counter flow with process stream on tube side
Parallel flow with process stream on shell side
Parallel flow with process stream on tube side

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