| Heat Diffusion Equation-3 |
- Net heat leaving the control volume
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(1.6) |
- Heat flux and area are vectors and therefore the dot product in the above expression
- Suppose heat flux is leaving a surface. The two vectors are in the same direction giving positive q i.e. leaving the surface. Heat flux entering the surface means it is opposite to area vector now giving a negative product.
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| Heat Diffusion Equation-4 |
- Net heat rate out
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(1.7) |
- Total heat generation rate
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(1.8) |
- Total storage rate
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(1.9) |
- Use these expressions in the energy balance equation
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