Experimental determination of time constants and Nusselt numbers for bare-wire thermocouples in high-velocity air streams and analytic approximation of conduction and radiation errors

Marvin D. Scadron, Isidore Warshasky
naca-tn-2599
Jan 1952


Experiments were conducted to determine time constants of several bare-wire thermocouples mounted in cross flow to an air stream. four pairs of common thermocouple materials as well as three different wire diameters were used. The probes were tested at the exit of a room-temperature jet exhausting into a pressure controlled chamber. The Mach number range was 0.1 to 0.9; the range of Reynolds number based on wire diameter was 250 to 30,000.

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