What is heat conduction ?
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Heat conduction is the process of transferring heat from a high temperature region to a low temperature region within a body via molecular motion. It is one of the three modes of heat transfer, along with convection and radiation. Heat conduction occurs primarily in solids, where the rate of heat flow is determined by the temperature gradient and the thermal conductivity of the material . In electrical machines, conduction is important for dissipating heat in solid regions such as electrical conductors, magnetic iron, insulating materials, and frames . The basic physics associated with conduction heat transfer involves the transport, exchange, and redistribution of thermal energy . Heat conduction devices, such as heat pipes, are designed to efficiently dissipate heat and improve heat dissipation effects . These devices conduct heat from a heat source unit to temperature control units, ensuring uniform temperature regulation .
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| Papers (5) | Insight |
|---|---|
| Heat conduction is the process of transferring heat through a material or between different materials in direct contact, as described in the provided paper. | |
| The provided paper is about a heat conduction device, but it does not provide a specific definition or explanation of heat conduction. | |
| Heat conduction is the process of transferring heat from a high temperature region to a low temperature region within a body via molecular motion. | |
| Heat conduction is one of the three modes of heat transfer, which involves the transfer of thermal energy through direct contact between particles in a solid material. | |
| Heat conduction is the transfer of heat through solids, and it is determined by the temperature gradient and thermal conductivity of the material. |
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How to measure thermal conductivity?5 answersThermal conductivity can be measured using various methods. One method involves applying a heat pulse to the material and detecting the resulting temperature field using an infrared detector. The thermal conductivities in different directions can then be calculated based on the shape of the temperature field. Another method involves embedding a thermistor in the material and applying a small current to determine the temperature. By applying a larger current and calculating the thermistor resistance, the thermal conductivity of the material can be calculated. A different approach involves measuring heat flows through a specimen at different temperatures and calculating the thermal conductivity based on the thickness, sectional area, temperatures, and heat flows. There are also other techniques such as the steady-state techniques, the 3ω technique, and the thermal diffusivity measurement, each with its own advantages and limitations. Additionally, a method using heat flux difference can accurately measure the thermal conductivity of an object by using the Fourier's heat conduction equation.
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