In thermodynamics, the heat transfer coefficient or film coefficient, or film effectiveness, is the proportionality constant between the heat flux and the thermodynamic driving force for the flow of heat (i.e., the temperature difference, ΔT).

Typical convective heat transfer coefficients for some common fluid flow applications: Free Convection - air, gases and dry vapors : 0.5 - 1000 (W/(m 2 K)) Free Convection - water and liquids: 50 - 3000 (W/(m 2 K))

The following table charts of typical convective convection heat transfer coefficients for fluids and specific applications.

The convective heat transfer coefficient is dependent upon the physical properties of the fluid and the physical situation. Values of h have been measured and tabulated for commonly encountered fluids and flow situations.

The Nusselt Number named after Wilhelm Nusselt, who made a large contribution to the science of convection, is a dimensionless coefficient which describes the ratio between convective and conductive heat transfer at a plane or wall.

The convective heat transfer coefficient (h) is dependent upon the physical properties of the fluid and the physical situation. Typically, the convective heat transfer coefficient for laminar flow is relatively low compared to the convective heat transfer coefficient for turbulent flow.

2022年9月18日 · Convection Equation. The equation for the rate of convection relates area and the difference between the fluid temperature and surface temperature: Q = h c ∙ A ∙ (T s – T f) Q is the heat transfer per unit time; h c is the coefficient of convective heat transfer; A is the area of heat transfer; T s is the surface temperature; T f is the ...

The convective heat transfer coefficient is sometimes referred to as a film coefficient and represents the thermal resistance of a relatively stagnant layer of fluid between a heat transfer surface and the fluid medium.

The convective heat transfer coefficient is sometimes referred to as a film coefficient and represents the thermal resistance of a relatively stagnant layer of fluid between a heat transfer surface and the fluid medium.

The convection heat transfer coefficient h c c-a is influenced by collector dimensions, its slope, air flow yaw angle, turbulence intensity and the ratio of free to forced convection. A large number of relationships and correlations can be found in literature.