Forced Convection - Heat transfer equation

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SUMMARY

The heat transfer due to forced convection can be calculated using a formula similar to that of natural convection, represented as Q = h A (ΔT). The critical factor in this equation is determining the convective heat transfer coefficient (h), which is influenced by system geometry, flow rates, and turbulence-enhancing devices. For accurate calculations, reference correlations based on non-dimensional parameters such as Reynolds, Nusselt, Prandtl, and Grashof numbers are essential for various forced convection scenarios.

PREREQUISITES
  • Understanding of convective heat transfer principles
  • Familiarity with non-dimensional numbers: Reynolds, Nusselt, Prandtl, and Grashof
  • Knowledge of fluid dynamics and flow characteristics
  • Experience with thermal system design and analysis
NEXT STEPS
  • Research methods to calculate the convective heat transfer coefficient (h) in forced convection
  • Explore correlations for forced convection in different geometries and flow conditions
  • Study the impact of turbulence on heat transfer efficiency
  • Learn about the application of non-dimensional analysis in thermal systems
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Mechanical engineers, thermal system designers, and students working on projects involving heat transfer and fluid dynamics.

02coled
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Hello

Wondering if anyone can help me towards finding an equation to calculate the heat transfer due to forced convection? Can't seem to find a good source for one at all, needs to be referenced for my MEng project.

Currently have for natural convection:

Q = h A (ΔT)

Thank you

02coled
 
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The formula is basically the same. The real question is how to find the value of h. That depends very much on the geometry of the system, the flow rates, whether there are devices to increase turbulence in the flow, etc.

You should be able to find some formulas (usually based on correlations) for different forced convection situations. They are often given in terms of non-dimensional parameters like the Reynolds, Nusselt, Prandtl, and Grasshof numbers for the flow, rather than in "physical units".
 

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