Greetings
Hello everyone, How are you friend steemit..?
On this occasion we will learn about the science of heat transfer heat on iron.
The transfer of heat from a substance to another substance often occurs in our daily life as well as in the industrial world.
the science of heat transfer is often we just go through dikarnakan this process is a process that we rarely realize at the time this process is going on ..
For all of us it is important to explore the science of heat transfer is happening in our lives.
Here is an explanation of the science of iron heat transfer which we will discuss as well as possible ..
The concept of heat transfer
Heat transfer is a science that studies the transfer of energy because of the difference in temperature between materials or objects.
When two different temperature bodies are combined, the heat will flow from a high-temperature object to a lower temperature object.
In addition, heat transfer also predicts the rate of heat transfer that occurs under certain conditions.
The heat transfer mechanism is divided into three parts:
- Heat conduction flow
- Convection heat flow
- Heat radiation flow
In the third application this mechanism can take place simultaneously.
Heat conduction flow
Conduction is the rate of heat transfer that occurs in solid medium. In this move the moves are only the heat and the medium does not move.
Example:
when a is making a machete or knife the. tip of the iron that is not heated will come hot.
This is why use gloves as insulators. The heat from the fireplace moves from the heated iron to the other end that is not heated.
That's a simple example that the heat is moving.
When one part of the metal comes in contact with the embers automatically the heat flows from the flame to the iron part
because of the additional heat, the metal part in contact with the flame of wax has a higher temperature.
The existence of the temperature difference between the metal parts in contact with the flame with the other iron parts, then all the iron parts also receive heat.
due to get additional energy, the molecules make up the object move faster. another molecule next to it moves more slowly because the molecule is not in direct contact with a high-temperature object.
Convection heat flow
Convection is the transfer of the heating rate of a substance accompanied by the displacement of the particles of the substance. this convection occurs because of differences in the density of the substance.
we can understand the convection events, among others :
When we heat water using a stove.
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Heat flows from the flame to the bottom of the container.
Due to the addition of heat, the base temperature of the container increases. remember, the one in contact with the flame is the outside of the container.
because there is a temperature difference, heat flows from the outside of the container container to the inside of the container.
The inside temperature of the base of the container also increases. because the water on the surface of the container has a smaller temperature, the heat flows from the bottom of the container to water.
Note that the heat transfer in the container occurs by conduction.
The transfer of heat from the bottom of the container to the water on the surface also occurs by conduction.
The presence of additional heat makes the water attached to the bottom of the container experienced an increase in temperature. as a result the water expands.
When expanding, the volume of water increases. because the volume of water increases then the density of water is reduced.
Remember..
The type or density mass equation
The expanding mass of water does not change, which only changes in volume. as the volume of water increases, the density of the species decreases. reduced density of water causes water to move upwards.
Heat transfer in water heating process is one example of convection heat transfer.
Heat radiation flow
Maybe we're used to the term bonfire, bonfires that are often lit during camping activities.
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What can we feel when we are around bonfire ..?
You will feel a warm fire from a distance.
How hot is the fire to your body ..?
The heat we receive from the flame is caused by emission energy.
This heat travels without going through an intermediates.
So the definition of radiation is the rate of heat transfer without going through an intermediary.
Conclusion
We can know that heat treatment is a study of the rate of energy transfer due to the temperature difference between the material or the object.
From the mechanism we can know the difference mechanism
Source
Text Source :
Journal of student conception about heat transfer
Image Source :