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What is the ratio of the rate of heat transferred by conduction to the rate of energy stored?
What is the ratio of the rate of heat transferred by conduction to the rate of energy stored?
What type of heat transfer occurs when a hot block is cooled by blowing cool air over its top surface?
What type of heat transfer occurs when a hot block is cooled by blowing cool air over its top surface?
What is the heat transfer mechanism that occurs when there is no medium required for heat energy to travel?
What is the heat transfer mechanism that occurs when there is no medium required for heat energy to travel?
What is the term used to describe the energy of a body that can be transmitted in the form of heat?
What is the term used to describe the energy of a body that can be transmitted in the form of heat?
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What is the direction of heat transfer through conduction?
What is the direction of heat transfer through conduction?
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Which of the following is the equivalent heat transferred in a gas undergoing isometric process?
Which of the following is the equivalent heat transferred in a gas undergoing isometric process?
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What is the statement based on Prevost theory of heat exchange?
What is the statement based on Prevost theory of heat exchange?
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What is the emissivity of a white body?
What is the emissivity of a white body?
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What is the mechanism of heat transfer that occurs through direct contact between particles or molecules?
What is the mechanism of heat transfer that occurs through direct contact between particles or molecules?
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What is the term used to describe a substance that is able to absorb liquids or gases and is usually used for removing liquid (or gases) from a given medium or region?
What is the term used to describe a substance that is able to absorb liquids or gases and is usually used for removing liquid (or gases) from a given medium or region?
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Study Notes
Heat Transfer Processes
- Heat transfer processes that involve a change of phase of a fluid are considered as a distinct type.
Conduction
- Conduction is the transfer of heat energy between particles in physical contact with each other.
- It is the passing of heat energy from molecule to molecule through a substance.
Convection
- Convection is the transmission of heat from one place to another by fluid circulation between spots of different temperatures.
- In natural convection, a heated portion of a fluid moves because of a density differential.
Radiation
- Radiation is the transfer of heat energy through electromagnetic waves.
- It is the mechanism of heat transfer that does not require a medium (e.g., water, air, solid concrete) for the heat energy to travel.
Heat Exchangers
- A heat exchanger is a device that transfers heat from one fluid to another.
- The function of a heat exchanger is to transfer heat from one fluid to another.
Thermodynamic Properties
- Internal energy is a measure of the total energy of a system.
- Enthalpy is the energy of a body that can be transmitted in the form of heat.
Material Properties
- Metals are good conductors of heat because they contain free electrons.
- The effectiveness of a body as a thermal radiator at a given temperature is known as emissivity.
Heat Transfer Coefficients
- The heat transfer coefficient is a measure of the rate of heat transfer between a surface and a fluid.
- If the viscosity of the fluid increases, the heat transfer coefficient will decrease.
Nusselt's Number
- Nusselt's number is a measure of the relative effectiveness of momentum and energy transport by diffusion in the velocity and thermal boundary layer.
Biot Number
- The Biot number is the ratio of the rate of heat transferred by conduction to the rate of energy stored.
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Description
Quiz on heat transfer mechanisms, including conduction, convection, and radiation, with a focus on phase changes and energy transfer.
