Abstract
A method is described which permits the reduction of transient matrix heat-transfer test data in the low N tu -range (0·5 < N tu < 5·0). This method (centroid method) is based on (1) the analytic solution of the single-blow problem for arbitrary (monotone decreasing) upstream fluid temperature changes and on (2) the indirect matching of downstream fluid temperature response curves by a single-valued functional which decreases monotonically with N tu -range, specifically by the centroid coordinate of the area under the difference of these two temperatures. Values of the centroid coordinate are presented for the case that the upstream temperature change is a step-function (sudden cooling). These data are supplemented by error amplification factors resulting from a linear error analysis. For the more general case of arbitrary upstream fluid temperature changes, two different procedures are suggested for the reduction of transient matrix heat-transfer test data: either the use of a computer which is programmed to implement the centroid method, or the use of an empirical formula which approximates the centroid coordinate.
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