PPT: Radiation | Heat Transfer - Mechanical Engineering PDF Download

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Radiation heat 
transfer 
Page 2


Radiation heat 
transfer 
Heat Transfer 
• Movement of heat energy
• Heat  moves from warmer surface to cooler surface
Page 3


Radiation heat 
transfer 
Heat Transfer 
• Movement of heat energy
• Heat  moves from warmer surface to cooler surface
Types of Heat Transfer 
Conduction
• Heat transfer through Direct Contact 
• Molecules transfer energy to the molecules next to them
Page 4


Radiation heat 
transfer 
Heat Transfer 
• Movement of heat energy
• Heat  moves from warmer surface to cooler surface
Types of Heat Transfer 
Conduction
• Heat transfer through Direct Contact 
• Molecules transfer energy to the molecules next to them
Convection
• Heat transfer by the movement of heated fluid 
particles.
• Classified as two types :
– Natural Convection
– Forced convection
Page 5


Radiation heat 
transfer 
Heat Transfer 
• Movement of heat energy
• Heat  moves from warmer surface to cooler surface
Types of Heat Transfer 
Conduction
• Heat transfer through Direct Contact 
• Molecules transfer energy to the molecules next to them
Convection
• Heat transfer by the movement of heated fluid 
particles.
• Classified as two types :
– Natural Convection
– Forced convection
Radiation
• Heat transfer in the form of electro magnetic 
radiation
• Only mode of heat transfer that doesn’t require 
any material medium for transport
• Can even take place in vacuum ( the only 
mode of heat transfer in vacuum)- critical in 
cryogenic applications
• A means of basic life on Earth 
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FAQs on PPT: Radiation - Heat Transfer - Mechanical Engineering

1. What is radiation?
Ans. Radiation refers to the emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles that cause ionization.
2. How does radiation affect the human body?
Ans. Radiation can have harmful effects on the human body, depending on the dose and duration of exposure. It can damage cells, leading to DNA mutations, cancer, and other health problems. Acute exposure to high levels of radiation can cause immediate symptoms such as radiation sickness.
3. What are the sources of radiation?
Ans. Radiation can originate from various sources, including natural sources such as cosmic rays, radon gas, and radioactive elements in the Earth's crust. Artificial sources include medical procedures, nuclear power plants, and industrial activities.
4. How can we protect ourselves from radiation?
Ans. There are several ways to protect ourselves from radiation. These include maintaining a safe distance from radiation sources, using shielding materials such as lead or concrete, wearing protective clothing, and following safety protocols during medical procedures.
5. What are the different types of radiation?
Ans. There are several types of radiation, including alpha particles, beta particles, gamma rays, and X-rays. Each type has different properties and levels of penetration. Alpha particles are the least penetrating, while gamma rays and X-rays are highly penetrating and can pass through the human body.
57 videos|77 docs|86 tests
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