The Nusselt Number is a dimensionless number that measures the enhancement of heat transfer through a fluid layer as a result of convection relative to conduction across the same layer. It is essential in characterizing convective heat transfer and is used to determine the efficiency of heat exchangers and other thermal systems.

Nusselt Number

dimensionless number

enhancement of heat transfer

fluid layer

Convection is the transfer of heat through the movement of fluids, driven by the temperature-induced density differences within the fluid. It plays a crucial role in atmospheric and oceanic circulation, influencing weather patterns and climate systems.

convection

Conduction is the process by which heat or electricity is directly transmitted through a substance when there is a difference of temperature or electrical potential, without movement of the material. It occurs at the microscopic level as energy is transferred between particles through collisions and interactions.

conduction

Convective heat transfer is the process of heat exchange between a solid surface and a fluid, driven by the fluid's motion. It plays a crucial role in numerous engineering applications, including heating, cooling, and ventilation systems, where fluid flow enhances heat transfer rates.

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