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  • 1
    facet.materialart.
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    Photon and radiowave emission from peeling pressure sensitive adhesives in air (1985)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: During separation of an adhesive from a polymer substrate in air, intense bursts of photons ('phE', for photon emission) and long wavelength electromagnetic radiation ('RE', for radiowave emission), similar to those reported earlier by Deryagin, et al. (1978) have been observed. In this paper, careful measurements of the phE time distributions, as well as time correlations between bursts of phE and RE, are reported. These results support the view that patches of electrical charge produced by charge separation between dissimilar materials lead to microdischarges in and near the crack tip. The role of these discharges in producing sustained phE after the discharge has been extinguished is also discussed.
    Keywords: NONMETALLIC MATERIALS
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Fracto-emission from the peeling of pressure sensitive adhesives (1985)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The electron emission, positive ion emission, photon emission, and long wavelength electromagnetic radiation accompanying the peeling of pressure sensitive adhesives in vacuum are examined. These results are interpreted in terms of a previously presented model involving fracture-induced microdischarges which excite the fracture surfaces by particle bombardment.
    Keywords: NONMETALLIC MATERIALS
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    NASA TECHNICAL REPORTS
  • 3
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    Control of thermocapillary convection in a liquid bridge by vibration (1993)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: The streaming induced in a short vertical liquid column by the vibration of one of the supporting end walls has been utilized in this novel study. Vibration essentially drives a surface flow in the zone away from the vibrating wall, with the return flow in the bulk towards the wall. Preliminary measurements of the surface streaming velocity show that it increases with the frequency and amplitude of vibration and the zone length and decreases with the viscosity of the zone liquid. This controlled surface streaming has been employed to balance an opposing steady thermocapillary flow in a model half-zone of silicone oil. In addition to the evidence gathered through flow visualization, temperature measurements in the zone reveal that the radial temperature gradients set up by the thermocapillary flow are weakened/offset by this balancing.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Journal of Applied Physics (ISSN 0021-8979); 73; 9; p. 4165-4170.
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    NASA TECHNICAL REPORTS
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