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#1

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Posted 08 June 2009 - 04:47 AM

A ball at a temperature of 20degrees moves through a liquid A at a temperature of 60degrees which is constant. Inside the ball is liquid B, which is also at a temperature of 20 deg.
The heat transfer resistance between the exterior surface of ball and liquid is to be neglected. Also no temperature profile exists in B. I need to find the evolution of temperature of liquid B with time.
This is what I did:
Rise in heat content of B = Heat transferred through the wall of the ball.
dQ/dt = UA(log mean temp difference)

now Q=(mCp(del T))ball

del T = T(Liquid B final) - T(liquid B initial)
Can anyone tell me what will be my log mean temperature difference here?

The temperature of the ball is changing. The temperature of the liquid B is changing. Is it right, if I am getting a coupled ODE?






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