Heat transfer between an electrically heated circular cylinder and water is to be examined for three different conditions. The heater has a diameter of 1.26 cm and is 7.5 cm long. The surface of the heater is at 380Kand the water is at 295 K. All heat transfer is from the lateral surface. Evaluate the heat transfer, in W, under conditions where

a. energy exchange is by natural convection with the heater axis oriented horizontally;

b. energy exchange is by natural convection with heater axis oriented vertically;

c. energy exchange is by forced convection with water flowing across the lateral surface at 1:5 m/s: