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nature : heat transfer a basic way. Heat in liquid or gas from a transfer to another process. Mainly due to the location of mobile particle, the temperature is more uniform. Liquid and gas heat transmission is the main mode. But often accompanied by heat conduction. Usually because of different reasons, natural convection and forced convection. According flow, and can be divided into layers turbulent convective heat and heat transfer. The chemical industry has often encountered in the convective heat, heat from the fluid to send the solid wall (such as thermal fluid near the side wall containers or duct wall), or by the solid wall into the surrounding fluid (such as cold fluid near the side of the tube wall, etc.). This transmission fluid from the wall or the opposite process, often referred to as heat.
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