METHOD FOR DISPLAYING SURFACE CHARACTERISTIC OF HEAT EXCHANGER PIPE BY RADAR DOPPLER SPECTROSCOPY, AND HEAT EXCHANGER PIPE

摘要

PROBLEM TO BE SOLVED: To provide a method for displaying the characteristics of the structured surface of a heat exchanger pipe rapidly, uniquely with improved reproducibility.;SOLUTION: In the method for displaying the structured inner surface and/or outer surface of the heat exchanger pipe welded to a longitudinal seam, each defined sample of a strip of structured material being anticipated for manufacturing the heat exchanger pipe is moved, and is subjected to radar Doppler spectrophotometry by using electromagnetic waves at a frequency range of 1-100 GHz. In this case, area integration A, an average value (m), and amount of dispersion S are obtained from the standardized radar Doppler spectrum with a smoothing pipe as a reference.;COPYRIGHT: (C)2005,JPO&NCIPI