what are the conditions of flow of heat please tell me it is urgent
Answers
Answer:
The factor or condition that is necessary for heat transfer to occur is that two object 'must have different temperature'.
Heat always flow or move from the hotter object to the cooler one.
Heat Transfer can occur in three ways: Conduction, Convection, and Radiation.
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Answer:
Explanation:
Material bodies in contact with a difference in their temperatures.
Heat energy is always transferred from a higher temperature region to a lower temperature region.
Mechanism of conduction in a gas :
In a higher temperature region, the molecules of a particular gas have higher velocities, move in a continuous random motion, colliding with each other and exchanging a great amount of energy and momentum.
Therefore if a molecule moves from a higher temperature region to a lower temperature region, kinetic energy is transferred to the lower temperature region and this energy transfer takes place until the system attains an equilibrium temperature.
Condition 2:
Material bodies may not be in contact with each other.
Mechanism of convection between a hot metal plate and air/fan :
Hot metal plate kept under a fan cools faster when compared to the hot metal plate in still air.
Here, Heat is convected.
The temperature gradient is dependent upon the rate at which the fluid carries the heat away.
Heat transferred from the hot metal plate to the fluid at the wall of the plate is obviously a conduction process, but overall the entire transfer of heat is a convective process.
Convection heat transfer depends upon the viscosity of the fluid and also the thermal properties such as conductivity, specific heat, density etc
Condition 3:
Heat transfer also occurs in a region where perfect vacuum exists.