1,510 research outputs found
Motion and wake structure of spherical particles
This paper presents results from a flow visualization study of the wake
structures behind solid spheres rising or falling freely in liquids under the
action of gravity. These show remarkable differences to the wake structures
observed behind spheres held fixed. The two parameters controlling the rise or
fall velocity (i.e., the Reynolds number) are the density ratio between sphere
and liquid and the Galileo number.Comment: 9 pages, 8 figures. Higher resolution on demand. To appear in
Nonlinearity January 200
A brief summary of L. van Wijngaarden's work up till his retirement
This paper attempts to provide an overview of Professor Leen van Wijngaarden's scientific work by briefly summarizing a number of his papers. The review is organized by topic and covers his work on pressure waves in bubbly liquids, bubble dynamics, two-phase flow, standing waves in resonant systems, and flow cavitation noise. A list of publications up till his retirement in March 1997 is provided in the Appendix
On the characteristics of the equations of motion for a bubbly flow and the related problem of critical flow
For the study of transients in gas-liquid flows, the equations of the so-called separated flow model are inadequate, because they possess, in the general case where gas and liquid move at different velocities, complex characteristics. This paper is concerned with the equations of motion for bubbly flow. The equations are discussed with emphasis on the aspects of relative motion and the characteristics are calculated. It is found that all characteristics are real. The results are used to establish a relation between gas velocity, liquid velocity, void fraction and sound velocity at critical flow. This relation agrees very well with experimental data for these quantities as measured by Muir and Eichhorn in the throat of a converging-diverging nozzle
Instantaneous Clear Sky Radiative Forcings of Halogenated Gases
The clear sky instantaneous radiative forcings of the 14 halogenated gases
previously shown to have the largest contribution to global warming, were
found. The calculation used the absorption cross sections for the halogenated
gases which are assumed to be independent of temperature as well as over 1/3
million line strengths for the 5 naturally occurring greenhouse gases: HO,
CO, O, CH and NO, from the Hitran database. The total radiative
forcing of the halogenated gases at their 2020 concentrations is 0.52 (0.67)
W/m at the tropopause (mesopause). Over half of this forcing is due to
CFC11 and CFC12 whose concentrations are declining as a result of the Montreal
Protocol. The rate of total forcing change for all 14 halogenated gases is 1.5
(2.2) mW/m/year at the tropopause (mesopause). The calculations assumed a
constant altitude concentration for all halogenated gases except CFC11, CFC12
and SF. Using the observed altitude dependence for those 3 molecules
reduced their radiative forcings by about 10%. The global warming potential
values were comparable to those given by the Intergovernmental Panel on Climate
Change. The contribution of a gas to global warming was estimated using the
forcing power per molecule defined as the derivative of its radiative forcing
with respect to its column density. For the present atmosphere, the
per-molecule forcing powers of halogenated gases are orders of magnitude larger
than those for the 5 naturally occuring greenhouse gases because the latter
have much higher concentrations and are strongly saturated. But, the rates of
concentration increase of the 5 main greenhouse gases are orders of magnitude
greater than that of any halogenated gas. Assuming the temperature increase
caused by each gas is proportional to its radiative forcing increase, the 14
halogenated gases are responsible for only 2% of the total global warming.Comment: arXiv admin note: text overlap with arXiv:2103.16465,
arXiv:2006.0309
Logarithmic two-loop corrections to the Lamb shift in hydrogen
Higher order logarithmic corrections to the
hydrogen Lamb shift are calculated. The results obtained show the two-loop
contribution has a very peculiar behavior, and significantly alter the
theoretical predictions for low lying S-states.Comment: 14 pages, including 2 figures, submitted to Phys. Rev. A, updated
with minor change
Deuterium Lamb shift via quenching-radiation anisotropy measurements
The Lamb shift of a hydrogenic ion can be deduced from the anisotropy in the angular distribution of the 2s12-1s12 electric field quenching radiation. The accuracy of our previous anisotropy measurement for deuterium is improved to about ± 150 ppm. The derived Lamb shift is (1059.36±0.16) MHz. The sources of error are carefully analyzed and the prospects for further improvements in the accuracy are discussed. © 1978 The American Physical Society
Measurements of an e 1-M 1 interference effect in the electric-field quenching of spin-polarized He+2s12 ions
When a beam of spin-polarized metastable He+2s12 ions is quenched by an electric field E, the emitted radiation intensity contains an asymmetry term which is proportional to kE ×P, where P is the spin-polarization vector and k is the direction of observation. The effect is due to interference between spontaneous magnetic-dipole (M 1) and induced electric-dipole (E 1) decay modes to the ground state. At |E|=38.14 V/cm, the measured asymmetry is (0.3230.085) × 10-3 in agreement with the theoretical value 0.3443 × 10-3. The experiment provides the first measurement of the relativistic M 1 matrix element for the 2s12-1s12 transition in a hydrogenic ion. The paper contains an extensive discussion of all possible asymmetry effects, including higher-order relativistic and electric-field perturbation corrections. © 1982 The American Physical Society
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