Ask about the problem of heat transfer, what is heat transfer

SSX555's method is correct, but it is very troublesome to find the least number of times.

The key is to lower the water temperature, and transfer all the water and aluminum alloy heat at once, the water temperature only drops to degrees, and the aluminum alloy heats up to degrees, (the water temperature and the aluminum alloy temperature are ultimately the same).

If half of the water is divided into heat transfer with the aluminum alloy first, due to the lack of water heat, the temperature of the aluminum alloy cannot reach the degree, so the water temperature is also reduced to below the degree, and then the other half of the water is used to transfer heat with the aluminum alloy.

It follows that the more water is divided, the more the average water temperature drops, and the higher the final temperature of the aluminum alloy.

The most hateful thing is to plagiarize other people's ideas.

In order to speed up the evaporation of water, the air pressure can also be reduced, so that the water boils below 90 degrees. This will allow the steam to be generated very quickly. Instead, the heating time is shortened.

Divide the water into several portions, put the aluminum block into the first part, wait for the heat to equilibrate, take it out and put it into the next part, and so on.

The more parts of water the better, and theoretically, if you let a fine layer of water flow through the aluminium block, the aluminium block will get the highest temperature, up to 90 degrees Celsius. Be surprised! Hehe.

I guess this question is a coincidence, about 3 or 4 equal parts of water, you can calculate the final temperature, and the temperature happens to be 63 degrees Celsius, what a coincidence! For this kind of coincidental question, it can only be described as very disgusting.

Divide the water into several portions and put the aluminum alloy in turn.

Slowly raise its temperature.

Hot sails are quietly passed:

1. Definition: It is the process of heat transfer from a high-temperature object to a low-temperature object, or from the high-temperature part of an object to the low-temperature part. Heat transfer is a natural phenomenon that is prevalent in the natural transport world.

2. Conditions: As long as there is a [temperature difference] between objects or between different parts of the same object, there will be heat transfer and will continue until the temperature is the same.

3. Direction: high temperature to low temperature.

4. Substance: Changing the internal energy of an object by means of heat transfer is to transfer a part of the internal energy of an object to another.

objects, or internal energy transfers from the high temperature part of the same object to the low temperature part. (Internal energy transfer process).

In the process of heat transfer, the matter does not migrate, but the hot object emits heat, the temperature decreases, the internal energy decreases (to be precise, the average kinetic energy of the molecules in the object does irregular motion decreases), the low temperature object absorbs heat, the temperature increases, and the internal energy increases. Therefore, the essence of heat transfer is the process of transferring energy from a hot object to a low temperature object, which is a way of energy transfer. It is the internal energy that is transferred by heat transfer, not the temperature.

Heat transfer (or heat transfer) is a physical phenomenon in physics, which refers to the transfer of heat energy due to temperature differences. In heat transfer, heat is used to measure the change in the internal energy of an object. There are three main forms of heat transfer:

Heat conduction, heat radiation, and heat convection. As long as there is a temperature difference within or between objects, heat energy must be transferred from high to low temperature in one or more of the above three ways.

For a solid heat source, when the temperature difference between it and the surrounding medium is not very large (about 50°C below), the heat transfer from the heat source to the surrounding medium can be calculated by Newton's cooling law.

The essence of heat transfer is the transfer of internal energy. The internal energy of an object is changed by means of heat transfer, that is, a part of the internal energy of an object is transferred to another object, or the internal energy of the vertical and the maker is the internal energy transfer from the high temperature part of the same object to the low temperature part. Heat transfer is a physical phenomenon in physics, which refers to the phenomenon of heat energy transfer caused by temperature difference.

Classification: Natural convection. When there is a temperature gradient inside the fluid, and then a density gradient occurs, the density of the fluid at high temperature is generally smaller than that of the fluid at low temperature (except for the abnormal expansion of water at 0 4 °C, etc.).

If the density from small to large corresponds to their position in space from low to high, then the fluid begins to flow due to gravity.

In addition, because the average kinetic energy of the irregular movement of molecules at high temperature is lower than that at temperature, the phenomenon of heat transfer from high temperature to low temperature occurs. In winter, indoor heating equipment uses the natural convection of indoor air to transfer heat. This thermal convection also exists in the atmosphere and oceans.

Phenomenon shelter. Forced convection. The fluid circulates by external action to transfer heat.

Thermal conduction. The macroscopic process of heat transfer from a high-temperature object to a low-temperature object (or from the high-temperature part of the object to the low-temperature part) is called heat conduction without the help of the macroscopic movement of matter. This heat transfer process can occur in gas, liquid, and solid objects.

1 Total heat transfer is the process of heat transfer from a high-temperature object to a low-temperature object, or from a high-temperature part of an object to a low-temperature part. Heat transfer is a natural phenomenon that is prevalent in nature. As long as there is a temperature difference between objects or between different parts of the same object, the phenomenon of heat transfer will occur and will continue until the temperature is the same.

The only condition for heat transfer to occur is the presence of a temperature difference, regardless of the state of the objects, whether the objects are in contact with each other or not. The result of heat transfer is the disappearance of the temperature difference, i.e. the same temperature is achieved between objects or different parts of the object where heat transfer occurs.