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流体与流体之间发生相对位移时的热量传递现象称为热对流。自然界中的风就是典型的热对流现象,即热、冷空气间的对流。火电厂中所采用的换热设备中,流体与壁面直接接触,且存在温差,这种由于温差而使流体与壁面间发生的热量传递现象称为对流换热,也称放热。例如锅炉受热面管内流体与管内壁或管外烟气与管外壁间都存在着对流换热。
The relative heat transfer between the fluid and the fluid is called convection. The wind in nature is a typical phenomenon of thermal convection, convection between hot and cold air. Thermal power plant used in the heat transfer equipment, the fluid in direct contact with the wall, and the existence of temperature, the temperature difference between the fluid and the heat transfer occurs between the wall called convection heat transfer, also known as exothermic. For example, there is convective heat transfer between the fluid in the heating surface of the boiler and the inner wall of the pipe or between the outer pipe and the outer wall of the pipe.