Section 16.3 ppt - Mrs. Graves Science
... expansion valve and decreases in temperature. • As the cold refrigerant flows through the evaporator coil, it absorbs thermal energy from the warm room air. • The fan sends cold air back into the room. The refrigerant becomes a vapor, and the process starts all over again. ...
... expansion valve and decreases in temperature. • As the cold refrigerant flows through the evaporator coil, it absorbs thermal energy from the warm room air. • The fan sends cold air back into the room. The refrigerant becomes a vapor, and the process starts all over again. ...
Heat Transfer
... A diffusive process wherein molecules transmit their kinetic energy to other molecules by colliding with them. ...
... A diffusive process wherein molecules transmit their kinetic energy to other molecules by colliding with them. ...
CH3080_reportsample_formaterrors
... the tube, the liquid inside the tube boils and vaporizes into a gas that moves through the tube seeking a cooler location where it condenses. Using capillary action, the wick transports the condensed liquid back to the evaporation area. What distinguishes heat pipe from other conventional heat excha ...
... the tube, the liquid inside the tube boils and vaporizes into a gas that moves through the tube seeking a cooler location where it condenses. Using capillary action, the wick transports the condensed liquid back to the evaporation area. What distinguishes heat pipe from other conventional heat excha ...
Chapter 18
... Conduction: heat transfer through direct contact. Convection: Convection happens when a fluid comes in contact with an object whose temperature is higher than that of the fluid. Heat is transferred through the flow of the fluid. Radiation: Heat can be exchanged via electromagnetic waves, called ther ...
... Conduction: heat transfer through direct contact. Convection: Convection happens when a fluid comes in contact with an object whose temperature is higher than that of the fluid. Heat is transferred through the flow of the fluid. Radiation: Heat can be exchanged via electromagnetic waves, called ther ...
document
... • The temperature of the hotter substance will decrease. The temperature of the colder substance will increase. Each change will stop when the temperatures are the same – thermal equilibrium. In other words, thermal energy travels from hot to cold. • Obj. #4 - Heat energy can be transferred by – Con ...
... • The temperature of the hotter substance will decrease. The temperature of the colder substance will increase. Each change will stop when the temperatures are the same – thermal equilibrium. In other words, thermal energy travels from hot to cold. • Obj. #4 - Heat energy can be transferred by – Con ...
Convection
Convection is the concerted, collective movement of groups or aggregates of molecules within fluids (e.g., liquids, gases) and rheids, through advection or through diffusion or as a combination of both of them. Convection of mass cannot take place in solids, since neither bulk current flows nor significant diffusion can take place in solids. Diffusion of heat can take place in solids, but that is called heat conduction. Convection cannot be demonstrated by placing a heat source (e.g. a Bunsen burner) at the side of a glass full of a liquid, and observing the changes in temperature in the glass caused by the warmer ghost fluid moving into cooler areas.Convective heat transfer is one of the major types of heat transfer, and convection is also a major mode of mass transfer in fluids. Convective heat and mass transfer take place both by diffusion – the random Brownian motion of individual particles in the fluid – and by advection, in which matter or heat is transported by the larger-scale motion of currents in the fluid. In the context of heat and mass transfer, the term ""convection"" is used to refer to the sum of advective and diffusive transfer. In common use the term ""convection"" may refer loosely to heat transfer by convection, as opposed to mass transfer by convection, or the convection process in general. Sometimes ""convection"" is even used to refer specifically to ""free heat convection"" (natural heat convection) as opposed to forced heat convection. However, in mechanics the correct use of the word is the general sense, and different types of convection should be qualified for clarity.Convection can be qualified in terms of being natural, forced, gravitational, granular, or thermomagnetic. It may also be said to be due to combustion, capillary action, or Marangoni and Weissenberg effects. Heat transfer by natural convection plays a role in the structure of Earth's atmosphere, its oceans, and its mantle. Discrete convective cells in the atmosphere can be seen as clouds, with stronger convection resulting in thunderstorms. Natural convection also plays a role in stellar physics.