A stainless-steel wall (AISI 302) is 0.2 m thick with the top surface at a temperature 40°C and the bottom surface at a temperature 100°C. Water, at [infinity] 25°C, flows over the top surface. Find the water flow convection coefficient, the temperature gradient in the wall and the temperature gradient in the water that is in contact with the wall. Assume steady-state conditions and evaluate the properties of the stainless-steel at 400 K.

a) Water flow convection coefficient

b) Temperature gradient in the wall,

c) Temperature gradient in the water,

Explanation:

Assumption: The flow is at steady state

At 400 K, steel has a thermal conductivity of,

Temperature at the bottom,

Temperature at the top,

Thickness of the stainless steel, L = 0.2 m

Film temperature of water,

a) Thermal conductivity of water at 305.5 K

b) Temperature gradient of steel,

Since steady state heat transfer is assumed, heat transfer by conduction equals heat transfer by convection

17.3 * A * 300 = h*A* (40 - 25)

h = 5190/15

h = 346 W/m²K

c) To calculate the temperature gradient in water, equate the heat transfer in both water and steel.

That is,

Where is the temperature gradient of water

1

explanation:

answer:

i lost in getting someone back.

i learned that people are really two-faced and no matter how angelic someone appears they always have a devil side and that you cant trust anyone anymore no matter how dear they are to you.

if your wondering who it waz it waz mah still miss her tho

~batmans wife dun dun