HEAT TRANSFER LECTURE 1 OUTLINE Introduction Heat Conduction Forced Convection Natural Convection Application of Conduction & Convection Thermal Radiation Application of Radiation Introduction What does the subject of heat transfer deal with? And why it is important. What does the subject of mass transfer deal with? Heat transfer is the science that deals with the study of rates of exchange of heat between hot and cold bodies.
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HEAT TRANSFER MECHANISMS Heat energy is being transferred from one location to another because of a temperature difference. The three mechanisms for heat transfer are: • Conduction. When you grip the hot handle of a pan on a stove‚ you feel conduction in action. Heat flows from the pan and along the length of the handle to its cooler free end. This is because one end of the rod is held at the high temperature‚ and the other end stays at the lower temperature. Although the rod itself doesn’t
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Heat energy is transferred from homes by conduction through the walls‚ floor‚ roof and windows. It is also transferred from homes by convection. For example‚ cold air can enter the house through gaps in doors and windows‚ and convection currents can transfer heat energy in the loft to the roof tiles. Heat energy also leaves the house by radiation through the walls‚ roof and windows. http://www.bbc.co.uk/schools/gcsebitesize/science/ocr_gateway_pre_2011/energy_home/1_keeping_homes_warm2.shtml Visited
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can never be stopped; it can only be slowed. Conduction Conduction is the transfer of heat by direct contact of particles of matter. The transfer of energy could be primarily by elastic impact as in fluids or by free electron diffusion as predominant in metals or phonon vibration as predominant in insulators. In other words‚ heat is transferred by conduction when adjacent atoms vibrate against one another‚ or as electrons move from atom to atom. Conduction is greater in solids‚ where atoms are in constant
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be imagined as a atomic or molecular activity which involves the transfer of energy from the more energetic to the less energetic particles of a substance due to interactions between the particles. | | Explanation: The physical mechanism of conduction is explained as follows: Consider a gas in which there exists a temperature gradient and assume that there is no bulk motion. The gas may occupy the space between two surfaces that are maintained at different temperatures‚ as shown in Figure 1.2
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this being: Radiation‚ Conduction‚ and Convection. Let’s start with radiation; radiation is the transfer of energy as electromagnetic waves. So basically it does not need to directly touch anything or move any particles around‚ much like convection and conduction do. Radiation mostly occurs through empty space‚ so I think a good example of radiation would be when you feel warm in front of a fire place‚ or even the way the sun heats up the Earth. All done through empty space. Conduction is another
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low temperature. The bigger the temperature difference‚ the faster the heat transfer. Heat moves by three different processes: Conduction - mainly in solids Convection - mainly in liquids and gases Radiation - any state of matter can absorb/emit infrared radiation. Conduction Vibrations in matter are passed on to transfer heat energy. This is called conduction. Insulator - a material that stops energy being transferred. Solids are good conductors because the particles are closer together
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one place to another‚ because of temperature changes. This can take place by three processes. These three processes are known as conduction‚ convection‚ and radiation. When we place two objects with different temperatures in contact with each other‚ the heat from the hotter object will immediately and automatically flow to the colder object. This is known as conduction. Some objects make excellent conductors of heat while others make poor conductors of heat or excellent insulators. Silver‚ copper
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which makes the drink cooler. To thoroughly comprehend the project‚ more research and knowledge is required. There are three processes by which heat energy can be transferred from one place to another: convection‚ conduction‚ and radiation. Heat can also be transferred by evaporation and radiation-which is when heat is carried directly by electromagnetic waves‚ or light. Those are just the basic methods of heat
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Basic cooking principle CONDUCTION Conduction occurs in two ways: 1. When heat moves directly from one item to another part of item example‚ from the top of the range to a soup pot placed on it‚ from the pot to the broth inside‚ and from the broth to the solid food items in it. 2. When heat moves from one part of something to an adjacent part of the same item for example‚ from the exterior of a roast to the interior‚ or from a sauté pan to its handle. Different materials conduct heat at different
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