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PROBLEM 3.8
Develop the control volume difference equation for one-dimensional steady conduction in a fin with variable cross-sectional area A(x) and perimeter P(x). The heat transfer coefficient from the fin to ambient is a constant oh and the fin tip is adiabatic.
GIVEN
Fin with variable cross-sectional area and perimeter
Convection coefficient to ambient is constant, ho
FIND
(a) Control volume difference equation
SKETCH

SOLUTION
Consider a control volume as shown below

An energy balance on this control volume is expressed by
heat conducted into left face =
heat convected out perimeter + heat conducted out right face
or


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Questões resolvidas

PROBLEM 3.8
Develop the control volume difference equation for one-dimensional steady conduction in a fin with variable cross-sectional area A(x) and perimeter P(x). The heat transfer coefficient from the fin to ambient is a constant oh and the fin tip is adiabatic.
GIVEN
Fin with variable cross-sectional area and perimeter
Convection coefficient to ambient is constant, ho
FIND
(a) Control volume difference equation
SKETCH

SOLUTION
Consider a control volume as shown below

An energy balance on this control volume is expressed by
heat conducted into left face =
heat convected out perimeter + heat conducted out right face
or


Prévia do material em texto

234
Applying the criterion that the temperature change per iteration should be less than 0.001, we see that 
Jacobi iteration requires 7 iterations while Gauss-Seidel iteration requires 6 iterations. 
PROBLEM 3.8 
Develop the control volume difference equation for one-dimensional steady conduction in 
a fin with variable cross-sectional area A(x) and perimeter P(x). The heat transfer 
coefficient from the fin to ambient is a constant oh and the fin tip is adiabatic. 
GIVEN 
Fin with variable cross-sectional area and perimeter 
Convection coefficient to ambient is constant, ho 
FIND 
(a) Control volume difference equation 
SKETCH 
 
SOLUTION 
Consider a control volume as shown below 
 
An energy balance on this control volume is expressed by 
 heat conducted into left face = 
 heat convected out perimeter + heat conducted out right face 
or

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