To determine air velocity changes, it is proposed
Chapter 7, Problem 7.59(choose chapter or problem)
To determine air velocity changes, it is proposed tomeasure the electric current required to maintain a plat-inum wire of 0.5-mm diameter at a constant tempera-ture of 77?C in a stream of air at 27?C.(a) Assuming Reynolds numbers in the range40?ReD?1000, develop a relationship betweenthe wire current and the velocity of the air that is incross flow over the wire. Use this result to establisha relation between fractional changes in the current,?I/I, and the air velocity, ?V/V.(b) Calculate the current required when the air velocityis 10 m/s and the electrical resistivity of the plat-inum wire is 17.1105 ? ??m.
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