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Heat Transfer Behavior of Small Wires Parallel to Flow
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English
Abstract
Convective heat transfer coefficients were determined for thermocouple junctions oriented parallel to the gas flow for Reynolds numbers (based on wire diameter) from 163 to 17,500. Chromel-alumel wires of 0.013-0.051 in. diameter were tested in air and products of natural gas combustion at temperatures of 60, 500, and 1000 F. Transient response was used to determine the heat transfer coefficient, and all data were corrected for variation of metal specific heat and radiant heat transfer. The affect on apparent heat transfer coefficient was determined for variations in junction weld-bead size, junction length, and wire separation.
An empirical equation has been derived relating Nusselt number and Reynolds number that fits 92% of the test data within ± 10%.
Authors
Citation
Moffat, R. and Haig, L., "Heat Transfer Behavior of Small Wires Parallel to Flow," SAE Technical Paper 620412, 1962, https://doi.org/10.4271/620412.Also In
References
- Scadron M. D. Warshawsky I. “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.” NACA TN 2599 Jan 1951
- Caldwell F. R. Olsen L. O. Freeze P. D. “Inter-comparison of Thermocouple Response Data.” Paper presented at SAE National Aeronautic Meeting New York April 1960
- Glawe G. E. Johnson R. C. “Experimental Study of Heat Transfer to Small Cylinders in a Subsonic, High Temperature Gas Stream.” NACA TN 3934 May 1957
- McAdams W. H. “Heat Transmission,” New York McGraw Hill 1954 259
- Ibid 265
- Moffat R. J. “Designing Thermocouples for Response Rate,” ASME Trans 80 2 Feb. 1958 257
- Moffat R. J. “A Stable High Temperature Thermometry Rig.” Paper presented at SAE National Aeronautic Meeting New York April 1960
- Wormser A. F. “Experimental Determination of Thermocouple Time Constants with Use of a Variable Turbulence, Variable Density Tunnel, and the Analytical Evaluation of Conduction, Radiation, and Other Secondary Effects.” 10 Paper presented at SAE National Aeronautic Meeting New York April 1960
- Mueller A. C. “Heat Transfer from Wires to Air in Parallel Flow,” Trans. Am. Inst. Chem. Eng 38 1942 513