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Coefficient of thermal expansion. The coefficient of thermal expansion describes how the size of an object changes with a change in temperature. Specifically, it measures the fractional change in size per degree change in temperature at a constant pressure. Several types of coefficients have been developed: volumetric, area, and linear.
where T r is the adiabatic wall temperature for given conditions of the problem and Î± 0 the heat transfer coefficient under undisturbed conditions. The concept of adiabatic wall temperature is used in the field of high velocity aerodynamics.The temperature profile in the boundary layer of a high-velocity gas flow over an adiabatic surface is displayed in Figure 1 (Curve 1).here T r is the adiabatic wall temperature for given conditions of the problem and Î± 0 the heat transfer coefficient under undisturbed conditions. The concept of adiabatic wall temperature is used in the field of high velocity aerodynamics.