Yarn Temperatures Attained During Cyclic Straining and the Heat Transfer Properties of Yarns

Abstract

This work was done to show that varn temperatures, during cyclic straining, can rise appreciably above ambient temperatures and to develop methods of predicting these temperatures. Yarn temperatures were calculated from a thermodynamic analysis of the cyclic straining process in terms of the heat transfer parameters of the yarn. The predicted temperatures were compared and found to agree with temperatures measured during cyclic straining. As a result, yarn temperatures can be computed from easily measured experimental parameters. The value of the heat transfer coefficient was found to be 3.6 (10)^-3 cal/sec-°C-cm², which agrees with values found by other means. The areas for heat transfer were also measured. These area values indicated that the yarn acts essentially as a closed bundle.