- #1
no183
- 16
- 0
For extended surface or fin, how do we find the convection coefficient ? Explain some general idea? thanks
The convection coefficient, h, is a measure of the ability of a fluid to transfer heat through convection. It represents the rate of heat transfer per unit area per unit temperature difference between the fluid and the surface it is in contact with.
Convection coefficient, h, is calculated using the heat transfer equation: Q = hA∆T, where Q is the heat transfer rate, A is the surface area, and ∆T is the temperature difference between the fluid and the surface.
The factors that affect convection coefficient, h, include the properties of the fluid (such as density, viscosity, and specific heat), the properties of the surface (such as roughness and shape), and the flow conditions (such as velocity and turbulence).
Convection coefficient, h, and thermal conductivity are both measures of the ability of a material to transfer heat. However, convection coefficient takes into account the movement of a fluid, while thermal conductivity only considers the material itself. Convection is typically a more effective heat transfer mechanism due to the movement of the fluid.
Convection coefficient, h, can be improved by increasing the velocity of the fluid, increasing the surface area of contact, and reducing the thickness of the boundary layer between the fluid and the surface. Using materials with higher thermal conductivity and smoother surfaces can also improve convection coefficient.