The Effect of Transverse Vibrations on the Heat Transfer Rate from a Heated Horizontal Cylinder in Free Convection PDF Download
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Author: John E. Hutton (CAPT, USAF., Jr)
Publisher:
ISBN:
Category : Cylinders
Languages : en
Pages : 56
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Author: John E. Hutton (CAPT, USAF., Jr)
Publisher:
ISBN:
Category : Cylinders
Languages : en
Pages : 56
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Author: John E. Hutton
Publisher:
ISBN:
Category :
Languages : en
Pages : 112
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Author: Andrew Joseph Shine
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 192
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 75
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The purpose was to determine the effect of diameter, temperature difference, and vibration intensity on the free convective heat transfer rate from horizontal cylinders subjected to transverse vibrations in air. The diameters of the cylinders were 0.085 and 0.25 inches. They were vibrated over a frequency range of 0 to 88 cycles per second and an amplitude range of 0 to 0. 35 inches. The surface temperature ranged from 138 to 201 degrees Fahrenheit, and the maximum vibration intensity was 29 in./sec. Above vibration intensities of 12 in./sec, the variation of the heat transfer rate for both cylinders followed the forced convection curve recommended by McAdams, and the value of the heat transfer rate was independent of the temperature difference. For a given temperature difference and vibration intensity, the value of the heat transfer rate increased as the cylinder diameter decreased. An interferometer study showed that the boundary layer was turbulent above vibration intensities of 12 in./sec.
Author: Thomas Woodrow Jackson
Publisher:
ISBN:
Category : Air flow
Languages : en
Pages : 136
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Results are presented for a series of experiments conducted for the purpose of studying the local and overall effects of a resonant acoustic vibration on the heat transfer coefficient for air flowing through a constant temperature isothermal tube at Graetz Numbers from 33 to 5400. The local heat transfer coefficient is shown to vary periodically between the nodes and loops of the resonant sound wave. Local heat transfer coeffients up to 3.6 times the no-sound values have been obtained. Extensive tables of data are included for possible use in analytical investigations. Sound pressure levels to 162 decibels are reported.
Author: Raymond Constantine Martinelli
Publisher:
ISBN:
Category : Cylinders
Languages : en
Pages : 130
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Author:
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 528
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Author: Umesh Chandra Saxena
Publisher:
ISBN:
Category :
Languages : en
Pages : 294
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Author: R. M. Fand
Publisher:
ISBN:
Category : Acoustics
Languages : en
Pages : 0
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Book Description
Several hypotheses have been proposed in the literature to explain the physical mechanism whereby transverse vibrations increase the rate of heat transfer by free convection from horizontal cylinders. A discussion is presented of the validity of these hypotheses in the light of recent experimentl data. The increase in the heat-transfer rate from a heated horizontal cylinder subjected to transverse horizontal vibrations is caused by thermoacoustic streaming. The increase is greatest on the upper half of the cylinder due to the action of the oscillating vortex flow which develops in this region at high intensities of vibration. The heat-transfer rate also increases on the lower half of the cylinder, where the flow is laminar. In the laminar region the rise in the rate of heat transfer appears to be caused by oscillations within the boundary layer similar to the effect of free-stream turbulence on the rate of heat transfer from a cylinder in cross-flow. The critical intensity of vibraions is approximately 0.3 ft/sec for vertical as well as for horizontal transverse vibrations of a heated horizontal cylinder.
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 172
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