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Author: robert berg

Displaying records 31 to 40 of 44 records.
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31. Hydrodynamic similarity in an oscillating body viscometer
Published: 9/1/1995
Author: Robert F Berg
Abstract: Hydrodynamic similarity can be used to calibrate simply and accurately an oscillating-body viscometer of arbitrarily complicated geometry. Usually, an explicit hydrodynamic model based on a simple geometry is required to deduce viscosity from the tra ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915335

32. Temperature and frequency dependence of anelasticity in a nickel oscillator
Published: 9/1/1995
Author: Robert F Berg
Abstract: The frequency dependence of the real and imaginary parts of a nickel oscillator‰s transfer function is described over 3 decades in frequency by the use of simple expressions. These expressions incorporate only the resonance frequency omega0, the qual ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915336

33. Remarkably small critical exponent for the viscosity of a polymer solution
Published: 7/15/1994
Authors: Robert F Berg, Karen Gruner
Abstract: We have measured the apparent critical exponent y characterizing the divergence of the viscosity eta  (T- Tc)^-y near the liquid-liquid critical point of the mixture polystyrene in diethyl malonate. The data span the range in reduced temperat ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915334

34. Thermal equilibration near the critical point: Effects due to three dimensions and gravity
Published: 9/1/1993
Author: Robert F Berg
Abstract: Two calculations are presented that clarify how the density profile equilibrates near the liquid-vapor critical point. Both use the equation of heat transfer recently improved to account for the large compressibility near the critical point. Previous ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915333

35. Flow of microemulsions through microscopic pores
Published: 11/15/1992
Authors: Dean C Ripple, Robert F Berg
Abstract: The flow of the microemulsion dioctylsulfosuccinate (AOT)/decane/water through 0.1 and 1.0 um diameter pores was studied for water droplet volume fractions ranging from 0 to 0.5. The viscosity of these microemulsions, as measured in a capillary visco ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915288

36. Milliwatt mixer for small fluid samples
Published: 2/1/1991
Author: Robert F Berg
Abstract: Mixing without excessive heating is sometimes needed for temperature-sensitive fluids. We modified an inexpensive low-frequency electronic filter based on a mechanical resonator to produce a compact (16 mm) and low-power (l-3 mW) mixer for low viscos ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915287

37. Milliwatt mixer for small fluid samples
Published: 2/1/1991
Authors: Robert F Berg, Nicholas P. De Luca
Abstract: Mixing without excessive heating is sometimes needed for temperature-sensitive fluids. We modified an inexpensive low-frequency electronic filter based on a mechanical resonator to produce a compact (16 mm) and low-power (l-3 mW) mixer for low viscos ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915340

38. Critical exponent for viscosity
Published: 12/15/1990
Authors: Robert F Berg, Michael R Moldover
Abstract: We have measured the critical exponent y characterizing the divergence of the viscosity eta  |T ‹ Tc|^-y for carbon dioxide and xenon. The values of y for both fluids fall within the range y = 0.041 ± 0.001 and are consistent with the range y ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915286

39. Critical exponent for the viscosity of carbon dioxide and xenon
Published: 8/1/1990
Authors: Robert F Berg, Michael R Moldover
Abstract: The viscosities eta of carbon dioxide and xenon have been measured near their critical points and the critical exponent y characterizing the asymptotic divergence, eta ~ |T- Tc|^-y, has been determined. Both fluids yielded exponents in the rangey = 0 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915285

40. Critical exponent for the viscosity of four binary liquids
Published: 9/15/1988
Authors: Robert F Berg, Michael R Moldover
Abstract: We have measured the viscosity of four binary mixtures near their consolute points: (1) methanol + cyclohexane, (2) isobutyric acid + water, (3) nitroethane + 3-methylpentane, and (4) 2-butoxyethanol + water. The viscosity data are consistent with th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915284



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