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Which method the heat is transferred from high temperature to low temperature body
Conduction
Radiation
Convection
All of above
All of above
Heat transfer is the process of movement of energy from a body at a higher temperature to a body at a lower temperature due to the temperature gradient. All three mechanismsтАФconduction, convection, and radiationтАФeffectively facilitate this energy exchange based on the physical properties of the medium.
Heat transfer is the process of movement of energy from a body at a higher temperature to a body at a lower temperature due to the temperature gradient. All three mechanismsтАФconduction, convection, and radiationтАФeffectively facilitate this energy exchange based on the physical properties of the medium.
Q=тИТkAdxdTтАЛ тАФ Fourier's Law of Conduction
Q=hA(TsтАЛтИТTтИЮтАЛ) тАФ Newton's Law of Cooling (Convection)
Q=╧Г╧╡AT4 тАФ Stefan-Boltzmann Law (Radiation)
Conduction occurs primarily in solids due to particle interaction.
Convection requires fluid motion and is typical in industrial heating elements.
Radiation is the only method that can occur in a perfect vacuum.
Second Law of Thermodynamics mandates that heat flows spontaneously only from hot to cold regions.
Conduction is highly efficient for contact-based heating.
Convection is essential for rapid heat distribution in liquids/gases.
Radiation allows for remote heating without physical contact.
Conduction requires physical interface intimacy.
Convection is dependent on fluid properties.
Radiation efficiency depends on surface emissivity and geometry.
Industrial furnaces
Heat exchangers
Immersion heaters
Electric resistance welding
The constant ╧Г is the Stefan-Boltzmann constant, approximately 5.67├Ч10┬░тИТ8W/m2K4.
The option 'All of above' is correct as these represent the three fundamental modes of heat transfer.
D is correct тАФ Conduction, convection, and radiation are the three primary physical modes of heat transfer that naturally transport energy from high to low temperature regions.
Remember that while heat flows spontaneously from high to low temperature, it requires external work (like a heat pump) to move heat from cold to hot.