Calculating Nusselts Number for Water Flow

[habte]

hey guys i got a problem.If you are given the bulk temperature of water, flowing at a velocity of 1.5m/s, to be 32 degrees celsius and is flowing through a 2.54cm ID duct which has a wall temperature of 43 degrees celsius. How can you calculate the nusselts number using three different ways?

 

[sophiecentaur]

What have you found out about it so far? This looks like an assignment and you should post it in the appropriate forum if you want the best chance of a good answer - but only after you have shown some input of your own.