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As mentioned earlier in the article the convection heat transfer coefficient for each stream depends on the type of fluid, flow properties and temperature properties. Some typical heat transfer coefficients include: Air - h = 10 to 100 W/(m 2 K) Water - h = 500 to 10,000 W/(m 2 K).
The film temperature is often used as the temperature at which fluid properties are calculated when using the Prandtl number, Nusselt number, Reynolds number or Grashof number to calculate a heat transfer coefficient, because it is a reasonable first approximation to the temperature within the convection boundary layer.
Heat sink performance (including free convection, forced convection, liquid cooled, and any combination thereof) is a function of material, geometry, and overall surface heat transfer coefficient. Generally, forced convection heat sink thermal performance is improved by increasing the thermal conductivity of the heat sink materials, increasing ...
The heat transfer coefficient h depends upon physical properties of the fluid and the physical situation in which convection occurs. Therefore, a single usable heat transfer coefficient (one that does not vary significantly across the temperature-difference ranges covered during cooling and heating) must be derived or found experimentally for ...
TPRC standard air is very nearly equivalent to typical air worldwide. Air, wet air ≈Typical Air [31] Air in motor windings at normal pressure, Lasance approximations 360 Kelvins 10 −2 meters: 0.03039 10 −3 meters: 0.03038 10 −4 meters: 0.03031 10 −5 meters: 0.02959 List, TPRC Vol 3 page 512. [24] [28] 360
Two types of convective heat transfer may be distinguished: Free or natural convection: when fluid motion is caused by buoyancy forces that result from the density variations due to variations of thermal ±temperature in the fluid. In the absence of an internal source, when the fluid is in contact with a hot surface, its molecules separate and ...
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