A Nonlinear Solution of Inverse Heat Conduction Problem for Obtaining the Inner Heat Transfer Coefficient

摘要

When steam-water two-phase mixtures flow in inclined or horizontal tubes that are heated by alternating current, the circular angle-dependent temperatures on the outer radius imply that the inner heat transfer coefficients also vary with circular angle. The inner heat transfer coefficients are difficult to measure directly, but may be determined with the aid of inverse heat conduction theory. The direct model calculates the temperature field inside a half-pipe. This is subjected to a given heat transfer coefficient angular profile on its inner radius. The inverse heat conduction model calculates the temperature field under the conditions of the measured discrete temperatures and the heat-insulated boundary on the outer radius. Variation of the cylinder heat conductivity and specific resistance versus temperatures are considered in both models. The prediction accuracy is analyzed with a numerical test. The inverse heat conduction problem solution is verified as a useful tool for obtaining the inner heat transfer coefficient.