pintalämpönsiirtokerroin

Pintalämpönsiirtokerroin, often denoted by the symbol h, is a crucial parameter in heat transfer calculations. It quantifies the rate of heat transfer between a solid surface and a surrounding fluid (liquid or gas) per unit area and per unit temperature difference. The units of pintalämpönsiirtokerroin are typically Watts per square meter Kelvin (W/(m²·K)) or Watts per square meter Celsius (W/(m²·°C)).

This coefficient is not a material property but rather a complex function that depends on numerous factors. These include the properties of the fluid itself, such as its viscosity, thermal conductivity, density, and specific heat capacity. Furthermore, the flow regime of the fluid plays a significant role. Whether the flow is laminar or turbulent, and whether it is natural (buoyancy-driven) or forced convection, greatly influences the pintalämpönsiirtokerroin. Surface characteristics, such as roughness, and the geometry of the solid surface also impact the heat transfer rate.

A higher pintalämpönsiirtokerroin indicates more efficient heat transfer between the surface and the fluid. Conversely, a lower value signifies poorer heat transfer. Understanding and accurately determining pintalämpönsiirtokerroin is essential for designing and analyzing various thermal systems, including heat exchangers, cooling systems, and building insulation. Experimental measurements and empirical correlations are commonly used to estimate its value in practical applications.