What is the type of thermal energy transfer that takes place in fluids mostly?
113735
Convection. EXAMPLES: If you think about a pot of water that is heated on a stove, the stove burner heats the bottom of the pot by conduction. Water touching the bottom of the pot is also heated by conduction. As this water is heated, it expands and becomes less dense than the cooler, denser water that is above it. The cooler, denser water at the top of the pot sinks and pushes the hot, less dense water upward. As the hot, less dense water rises, its particles come in contact with colder water particles, so it gives up heat energy to the lower temperature water particles with which it collides. That is, it cools by conduction. As it cools it "contracts" and becomes denser, causing it to drop toward the bottom of the pot again, forcing the warmer water below it to rise. This movement causes convection currents. These currents transfer thermal energy from warmer to cooler parts of the liquid.
699724
fluids - convection is due to the movement of molecules
575202
heat is a form of energy.
252829
what's the heat source?
548136
only energy is transferred.  Think about it - if you're in the  ocean and a wave comes by, you bob up and down but aren't swept away.
318461
Depends on what you need.  I work for a manufacturer of heat transfers.  Tell me what you need and maybe I can help you out.
227687
The heat transfer coefficient is usually represented by the variable h and is used in problems involving natural convection.  It can vary depending on the type and speed of the fluid.  Typical values can be found in a heat transfer book for different fluids with forced or natural convection.
1101939
A thermocuple might be the one you seek. \n\nThe seebeck effect on thermocouple uses this theory, as there are two different material soldered together to make a single V or U shaped bar, there is a point where those two metals met. When we heat that point, the heat will move the electron, and since one metal has different coefficient than the other, so the electron will move from one metal to the other, thus an electric current will be created.\n\nPeltier effect, uses the vice versa theory, thus if we put electrical current through that thermocouple, then the thermocouple will need to absorb heat from it surroundings, thus, it will lower the ambient temperature.\n\nI haven't got any clue on how effective does this "refrigerant" work, but I think It might, might, might, work..
846365
Thermal energy IS heat.
560878
Convection\nConvection is the transfer of heat by currents within a fluid. It may arise from temperature differences either within the fluid or between the fluid and its boundary, which would affect density. Other sources of density variations, such as variable salinity, or from the application of an external motive force are also often causes. It is one of the three primary mechanisms of heat transfer, the others being conduction and radiation. Convection occurs in atmospheres, oceans, and planetary mantles.\n\n\nhttp://en.wikipedia.org/wiki/Convection
639571
A good example of conduction is when you leave a spoon in boiling water, it gets hot. This is because the water molecules transfer or conduct heat to the spoon molecules. This is different to radiated heat, like sitting in front of a fire where the amount of heat you receive is directly proportional to the square of the distance from the heat source. Jules. Australia.
878486
In convection parcels of material move. In conduction it is the energy that migrates.\n\nConvection can only involve heat. Conduction can involve heat and electricity.\n\nConduction happens in solids. Convection occurs in gases or liquids only.\n\nI'll get back to to you....
1057731
1.Heat is electromagnetic radiation and by using a photocell you could transfer heat into electric energy.\n2.You can also employ a thermocouple to generate some electricity\n3.A steam and Sterling engine can serve as good examples of heat changing into mechanical energy.\n4.Heating and cooling two co-joined metal strips of different linear expansion into buckling and relaxation. \n5.There more examples.
225705
Energy can exist in many forms (chemical, electrical, mechanical, light and heat, etc.) and can be converted from one form to another without being lost (conservation of energy).  When solar energy strikes different surfaces it is either mostly reflected (from pure white or mirrors) or absorbed (pure black) or somewhere in between.  Solar energy consists of photons that enter the material and interact with the electrons of atoms (and molecules) and knock the electrons into higher orbits storing energy.  When the electrons fall back to rest orbits they give up their excess energy as photons.  To understand heat transfer, follow the electrons and photons because the black surfaces that absorbed the photons heats up.  Heat may be stored within a material in its solid, liquid and gaseous states.  Atoms of solids vibrate more when hot and transfer some energy to adjacent cooler atoms within a crystal.  Atoms of liquids bump into each other with more force when hot and transfer some energy to cooler atoms.  Atoms within a gas travel at greater velocities when hot and transfer some energy to any other cooler atom it strikes (like pool balls).  Heat stored in vibrating solids atoms and circulating liquid atoms and flying gaseous atoms can transfer energy from hotter to cooler atoms and in fact a copper vessel filled with half water and half air will reach an equilibrium (identical) temperature as all three states warm or cool by transferring heat energy.  At equilibrium, there will still be atoms well above or below the equilibrium temperature which is only an average temperature.  Thus you can have steam in an ice cube or ice in a flow of steam depending upon the instantaneous (and highly temporary) state or two or more adjacent atoms, but all are driven back toward the equilibrium state by additional collisions or vibrations of neighbors.\n\nThat said, heat is transferred from solid to solid in contact (metal pot on electrical heating element?) by conduction as vibrations of hot neighbors affect cooler neighbors.  Heat is transferred by conduction (from the pot to liquid at the bottom?) by metal atoms vibrating against liquid atoms.  The hot liquid at the bottom of the pot is less dense (due to expansion caused by liquid atom vibrations and electrons in higher orbits) and rises to the top by convection (stirring or forced convection helps).  If you hold your hand near the pot you can feel heat similar to solar heat of radiation.  As electrons in the heated metal fall from higher energetic orbits to rest orbits, photons are transmitted to your hand raising some of your oown electrons to higher (hotter) orbits.\n\nInterestingly, if you open the drapes of your picture window on a frigid winter day, radiation energy will enter your house from outside while even more radiation is leaving from inside, and the net effect will be to cool the house, unless the sun is shining brightly through the window.  It sounds strange but if the interior of your house was at absolute zero temperature the same radiation from the "cold" outside would enter and heat it, right?
12026
Good luck with your exam, this should help:\n\nConvection  is the transfer of heat by the actual movement of the warmed matter. Heat leaves the coffee cup as the currents of steam and air rise. Convection is the transfer of heat energy in a gas or liquid by movement of currents. (It can also happen is some solids, like sand.) The heat moves with the fluid. Consider this: convection is responsible for making macaroni rise and fall in a pot of heated water. The warmer portions of the water are less dense and therefore, they rise. Meanwhile, the cooler portions of the water fall because they are denser.\n\nConduction is the transfer of energy through matter from particle to particle. It is the transfer and distribution of heat energy from atom to atom within a substance. For example, a spoon in a cup of hot soup becomes warmer because the heat from the soup is conducted along the spoon. Conduction is most effective in solids-but it can happen in fluids. Fun fact: Have you ever noticed that metals tend to feel cold? Believe it or not, they are not colder! They only feel colder because they conduct heat away from your hand. You perceive the heat that is leaving your hand as cold.\n\nRadiation: Electromagnetic waves that directly transport ENERGY through space. Sunlight is a form of radiation that is radiated through space to our planet without the aid of fluids or solids. The energy travels through nothingness! Just think of it! The sun transfers heat through 93 million miles of space. Because there are no solids (like a huge spoon) touching the sun and our planet, conduction is not responsible for bringing heat to Earth. Since there are no fluids (like air and water) in space, convection is not responsible for transferring the heat. Thus, radiation brings heat to our planet.
488316
It is the transfer of energy through a medium, in your question, water is the medium through which the energy is absorbed and dissipated. The mass in motion crosses the barrier of a gas (air) and is transferred into a Liquid (water). The two states of matter of three possible (solid, Liquid & gas) collide and the energy is read in a sine. It is no different in understanding a sine wave pictuered on a scope when we study electricity. The water shows one half of the wave, the other is in the air and that you can not see. Energy moves faster via the gas. If you watch a detenation of explosives such as in the minning of ores, the shock wave can be seen racing along the gound from the epic. The sublevel absorbs the energy and fractures the Earth. The above ground energy rattles your head. Since the energy is transfered equally in all directions is the "why " for the circle. If you really want to put some thought into this...it explains why Galixies and Solar systems are flat disks in space.
1003847
The study of heat and how it behaves.