Table of Contents
- 1 What are the assumptions made before deriving the one dimensional heat equation?
- 2 How does heat transfer apply to the laws of thermodynamics?
- 3 Why is the heat equation important?
- 4 Is it possible to have a solution for 1-Dimensional heat equation which does not converge as time approaches infinity?
- 5 In which of the following substance it Cannot be transmitted by method of convection?
- 6 How does the 2nd law of thermodynamics relate to the direction of heat flow?
- 7 What is the distribution of temperature along a heated thin rod?
- 8 What is heat equation (diffusion equation)?
What are the assumptions made before deriving the one dimensional heat equation?
(Ideal) Assumptions: Rod is given some initial temperature distribution f (x) along its length. Rod is perfectly insulated, i.e. heat only moves horizontally. No internal heat sources or sinks.
Which of the following is not a method of heat transfer?
Which from the following is NOT a method of heat transfer
| Type | Answers |
|---|---|
| A) | Conduction |
| B) | Convection |
| C) | Radiation |
| D) | All are methods of heat transfer |
How does heat transfer apply to the laws of thermodynamics?
The Second Law of Thermodynamics(first expression): Heat transfer occurs spontaneously from higher- to lower-temperature bodies but never spontaneously in the reverse direction. The law states that it is impossible for any process to have as its sole result heat transfer from a cooler to a hotter object.
Why is the heat of diffusion equation not consistent with special relativity?
The classical heat equation is incompatible with relativity, since the strong maximum principle allows for disturbances to propagate instantaneously. Some authors have proposed limiting the propagation speed by adding a linear hyperbolic correction term, but then even a weak maximum principle fails to hold.
Why is the heat equation important?
The heat equation is an important partial differential equation which describes the distribution of heat (or variation in temperature) in a given region over time. or equivalently where k is a constant.
When solving 1-Dimensional heat What is the equation?
Goal: Model heat (thermal energy) flow in a one-dimensional object (thin rod). u(x,t) = temperature in rod at position x, time t. ∂u ∂t = c2 ∂2u ∂x2 . (the one-dimensional heat equation ) The constant c2 is called the thermal difiusivity of the rod.
Is it possible to have a solution for 1-Dimensional heat equation which does not converge as time approaches infinity?
Is it possible to have a solution for 1-Dimensional heat equation which does not converge as time approaches infinity? Explanation: It is not possible to have a solution which does not converge as time approaches infinity because the solution to a heat equation must be transient.
Which materials do not allow the heat to pass through them?
Then there are materials called “insulators” that do not allow energy to pass through easily. These materials include plastic, cork, wood, Styrofoam, and rubber. Thermal insulators are thus good at maintaining a consistent level of heat — whether hot or cold. One example of a great insulator is a thermos.
In which of the following substance it Cannot be transmitted by method of convection?
Therefore, convection is impossible in solids because the molecules are rigid and vibrate when heated. In liquids and gases, molecules are comparatively less rigid and can move easily, thereby making convection possible in them.
Which law of thermodynamics would be violated if heat were to spontaneously flow between two objects of equal temperature?
Which law of thermodynamics would be violated if heat were to spontaneously flow between two objects of equal temperature? The principle of conservation of energy. Energy can be transferred and transformed, but it cannot be created or destroyed.
How does the 2nd law of thermodynamics relate to the direction of heat flow?
In physics, the second law of thermodynamics says that heat flows naturally from an object at a higher temperature to an object at a lower temperature, and heat doesn’t flow in the opposite direction of its own accord.
What happens to a rod when it is heated?
Now the rod is heated at one point or even at several points. Heat then flows from places of higher temperature to places with lower temperatures. As a result, hot spots become colder and cooler spots hotter, until at some point the temperatures have equalized and the rod has a uniform and temporally constant temperature.
What is the distribution of temperature along a heated thin rod?
Figure: Temperature distribution along a heated thin rod In addition, the material properties of the homogeneous rod, such as heat capacity and density, are considered to be constant. Now the rod is heated at one point or even at several points. Heat then flows from places of higher temperature to places with lower temperatures.
How to make use of heat equation?
To make use of the Heat Equation, we need more information: 1. Initial Condition (IC): in this case, the initial temperature distribution in the rod u(x,0). 2. Boundary Conditions (BC): in this case, the temperature of the rod is affected by what happens at the ends, x = 0,l.
What is heat equation (diffusion equation)?
Derivation of heat equation (diffusion equation) – tec-science The heat equation describes the temporal and spatial behavior of temperature for heat transport by thermal conduction. Home Mechanics