Heat Equation Problem: Solving c + 3d = 0

In summary, the problem is related to the heat equation and involves determining the equation -c + 3d = 0. The concept of perfect thermal contact is used, and Fourier's law is applied to find the solution. The equation simplifies to -c + 3d = 0 after substituting the given conductivities and solutions.
  • #1
FAS1998
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I’ve attached an image of a solved problem related to the heat equation.

Can somebody explain the -c + 3d = 0 comes from? I’m having trouble following the work shown.
 

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  • #2
Hard to say since your image is way too small to read
 
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Perfect thermal contact occurs at x=1, so the flow coming from the right is equal to the flow coming from the left. Now recall that the flow is given by ##\phi=-K_0\frac{\partial u}{\partial x}##, that is Fourier's law. The derivatives on both sides are constants as it's shown on your work so we're just left with: $$K_{1}\dfrac{\partial u_1}{\partial x} = K_{2}\dfrac{\partial u_2}{\partial x} \\ -c = -3d \\ -c+3d=0$$ I took the liberty to introduce some notation since it's a little confusing in your solution, but essentially all you have to do is substitute the conductivities given in the exercise and the solutions you found for u.
 
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1. What is the heat equation problem?

The heat equation problem is a mathematical model used to describe the distribution of heat in a given system over time. It is commonly used in physics and engineering to study heat transfer and temperature changes in various materials.

2. How is the heat equation problem solved?

The heat equation problem is typically solved using mathematical techniques such as separation of variables, Fourier series, or numerical methods. These methods involve breaking down the problem into smaller, more manageable parts and using equations and algorithms to find a solution.

3. What is the significance of c + 3d = 0 in the heat equation problem?

In the heat equation problem, c and d represent constants that are used to describe the initial conditions and boundary conditions of the system. The equation c + 3d = 0 is often used to simplify the problem and make it easier to solve. It can also represent a specific scenario or physical situation.

4. Can the heat equation problem be applied to real-world situations?

Yes, the heat equation problem can be applied to a wide range of real-world situations, such as heat transfer in materials, temperature changes in a room, or the cooling of a hot object. It is a useful tool for understanding and predicting heat distribution and changes in various systems.

5. Are there any limitations to the heat equation problem?

While the heat equation problem is a powerful tool for studying heat transfer, it does have some limitations. It assumes certain simplifying assumptions, such as constant thermal properties and no internal heat sources, which may not always hold true in real-world situations. Additionally, it may not accurately model very complex or nonlinear systems.

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