Beiträge zur Hitzdrahtmethode

Abstract

(i) The characteristics of hot-wires are calculated approximately, by using the experimental results of the heat loss of thin cylinders in a cross-stream. They are based upon the similarity law of heat transfer by forced convection. The approximation lies in that the heat losses at the two ends of such probes are neglected, so that the results apply exactly only to wires of finite length as a part of infinitely long wires. (ii) Starting from an evaluation formula previously derived, a practical method is developed for determining the sensitivity of hot-wire probes. This method is based upon the complete semi-empirical equation byKing.