Abstract
The effective optimal and practical time-dependent heat transfer coefficients of the cooling passage for high-speed motors are determined in a three-dimensional optimal control problem. The control algorithm utilizing the steepest descent method and a general purpose commercial code CFX4.4 is applied successfully in accordance with the design (or desired) temperature distributions on the interior heating surface. Two different design temperature distributions are used to illustrate the validity of determining both the effective optimal and practical heat transfer coefficients. Results of the numerical simulation show that the reliable estimated effective practical heat transfer coefficients can be obtained by using the present optimal inverse design (or optimal control) algorithm.
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