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NACA-RM-E53J07
Measurement of heat-transfer and friction coefficients for flow of air in noncircular ducts at high surface temperatures
Year: 1954
Abstract: INTRODUCTION
An experimental investigation was instituted at the NACA Lewis laboratory to obtain heat-transfer and related pressure-drop information for air flowing in tubes at high surface and fluid temperatures. The effects of such variables as surface temperature, inlet-air temperature, length-to-diameter ratio, and tube-entrance configuration on heat transfer and pressure drop in smooth round tubes are summarized in reference 1.
The scope of the general investigation is extended herein to include the effect of flow-passage shape on heat-transfer and friction coefficients for air flowing through electrically heated square, triangular, and rectangular tubes at high heat-flux conditions. Data were obtained for a range of Reynolds number from 1000 to 330,000 and surface temperature from 540º to 1780º R, and the results are compared with those of reference 1 for circular tubes.
An experimental investigation was instituted at the NACA Lewis laboratory to obtain heat-transfer and related pressure-drop information for air flowing in tubes at high surface and fluid temperatures. The effects of such variables as surface temperature, inlet-air temperature, length-to-diameter ratio, and tube-entrance configuration on heat transfer and pressure drop in smooth round tubes are summarized in reference 1.
The scope of the general investigation is extended herein to include the effect of flow-passage shape on heat-transfer and friction coefficients for air flowing through electrically heated square, triangular, and rectangular tubes at high heat-flux conditions. Data were obtained for a range of Reynolds number from 1000 to 330,000 and surface temperature from 540º to 1780º R, and the results are compared with those of reference 1 for circular tubes.
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T17:26:13Z | |
| date available | 2017-09-04T17:26:13Z | |
| date copyright | 01/01/1954 | |
| date issued | 1954 | |
| identifier other | CJMCWDAAAAAAAAAA.pdf | |
| identifier uri | http://yse.yabesh.ir/std/handle/yse/149282 | |
| description abstract | INTRODUCTION An experimental investigation was instituted at the NACA Lewis laboratory to obtain heat-transfer and related pressure-drop information for air flowing in tubes at high surface and fluid temperatures. The effects of such variables as surface temperature, inlet-air temperature, length-to-diameter ratio, and tube-entrance configuration on heat transfer and pressure drop in smooth round tubes are summarized in reference 1. The scope of the general investigation is extended herein to include the effect of flow-passage shape on heat-transfer and friction coefficients for air flowing through electrically heated square, triangular, and rectangular tubes at high heat-flux conditions. Data were obtained for a range of Reynolds number from 1000 to 330,000 and surface temperature from 540º to 1780º R, and the results are compared with those of reference 1 for circular tubes. | |
| language | English | |
| title | NACA-RM-E53J07 | num |
| title | Measurement of heat-transfer and friction coefficients for flow of air in noncircular ducts at high surface temperatures | en |
| type | standard | |
| page | 28 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1954 | |
| contenttype | fulltext |