scholarly journals Polarimetry of Water Ice Particles Providing Insights on Grain Size and Degree of Sintering on Icy Planetary Surfaces

2018 ◽  
Vol 123 (10) ◽  
pp. 2564-2584 ◽  
Author(s):  
O. Poch ◽  
R. Cerubini ◽  
A. Pommerol ◽  
B. Jost ◽  
N. Thomas
Keyword(s):  
Grain Size ◽  
Planetary Surfaces ◽  
Water Ice ◽  
Ice Particles

scholarly journals THE STICKINESS OF MICROMETER-SIZED WATER-ICE PARTICLES

2014 ◽  
Vol 798 (1) ◽  
pp. 34 ◽  
Author(s):  
B. Gundlach ◽  
J. Blum
Keyword(s):  
Water Ice ◽  
Ice Particles

scholarly journals A Notch-Strengthening Effect in Fresh-Water Ice

1990 ◽  
Vol 36 (122) ◽  
pp. 107-111 ◽  
Author(s):  
Wilfrid A. Nixon ◽  
Erland M. Schulson
Keyword(s):  
Grain Size ◽  
Notch Root ◽  
Tensile Tests ◽  
Root Diameter ◽  
Stress Constraint ◽  
Strengthening Effect ◽  
Water Ice ◽  
Controlling Mechanism ◽  
Polycrystalline Ice ◽  
Oriented Polycrystalline

AbstractTensile tests have been performed on notched and unnotched cylindrical samples of randomly oriented polycrystalline ice of controlled grain-size (between 2.2 and 7.3 mm) at a loading rate of 100Pa s−1and at a temperature of −10°C In the notched samples, the notch-root diameter was 80% of the base diameter. A notch-strengthening effect was observed in the large-grained ice, with fracture stresses being up to 50% higher than that for unnotched samples of the same grain-size. This notch-strengthening effect diminished as grain-size decreased, disappearing at a grain-size of ≈3 mm.The notch-strengthening effect is explained in terms of the triaxial stress constraint at the notch root. This triaxial constraint results in a change in the controlling mechanism of fracture from crack propagation in the unnotched samples to crack initiation in the notched samples.

scholarly journals Synthesis of water ice particles in a plasma chamber

2010 ◽  
Vol 115 (D18) ◽  
Author(s):  
S. Shimizu ◽  
B. Klumov ◽  
T. Shimizu ◽  
H. Rothermel ◽  
O. Havnes ◽  
...  
Keyword(s):  
Water Ice ◽  
Plasma Chamber ◽  
Ice Particles

scholarly journals Micrometer-sized Water Ice Particles for Planetary Science Experiments: Influence of Surface Structure on Collisional Properties

2017 ◽  
Vol 848 (2) ◽  
pp. 96 ◽  
Author(s):  
S. Gärtner ◽  
B. Gundlach ◽  
T. F. Headen ◽  
J. Ratte ◽  
J. Oesert ◽  
...  
Keyword(s):  
Surface Structure ◽  
Planetary Science ◽  
Water Ice ◽  
Ice Particles

scholarly journals Millimeter-sized Dust Grains Surviving the Water-sublimating Temperature in the Inner 10 au of the FU Ori Disk

2021 ◽  
Vol 923 (2) ◽  
pp. 270
Author(s):  
Hauyu Baobab Liu ◽  
An-Li Tsai ◽  
Wen Ping Chen ◽  
Jin Zhong Liu ◽  
Xuan Zhang ◽  
...  
Keyword(s):  
Grain Size ◽  
Binary Stars ◽  
Thermal Emission ◽  
Dust Grains ◽  
Radio Observations ◽  
Very Large Array ◽  
Water Ice ◽  
Fu Ori ◽  
June July ◽  
Dust Grain

Abstract Previous observations have shown that the ≲10 au, ≳400 K hot inner disk of the archetypal accretion outburst young stellar object, FU Ori, is dominated by viscous heating. To constrain dust properties in this region, we have performed radio observations toward this disk using the Karl G. Jansky Very Large Array in 2020 June–July, September, and November. We also performed complementary optical photometric monitoring observations. We found that the dust thermal emission from the hot inner disk mid-plane of FU Ori has been approximately stationary and the maximum dust grain size is ≳1.6 mm in this region. If the hot inner disk of FU Ori, which is inward of the 150–170 K water snowline, is turbulent (e.g., corresponding to a Sunyaev & Shakura viscous α t ≳ 0.1), or if the actual maximum grain size is still larger than the lower limit we presently constrain, then as suggested by the recent analytical calculations and the laboratory measurements, water-ice-free dust grains may be stickier than water-ice-coated dust grains in protoplanetary disks. Additionally, we find that the free–free emission and the Johnson B- and V-band magnitudes of these binary stars were brightening in 2016–2020. The optical and radio variability might be related to the dynamically evolving protostellar- or disk-accretion activities. Our results highlight that the hot inner disks of outbursting objects are important laboratories for testing models of dust grain growth. Given the active nature of such systems, to robustly diagnose the maximum dust grain sizes, it is important to carry out coordinated multiwavelength radio observations.

volved the use of ultra-clean ic e particles, having a uniform grain size, for clean-ing the surface and grooves of ferrite block (Tomoji [4]). An ice blasting device utilizing stored particle s was suggested by Harima [5]. Vissisouk [6] proposed to use ice particles near melting temperature for surface decoating. Mesher [7] de-velope d a nozzle for enhancement of the surface cleaning by ice blasting. Shinichi [8] suggested an inexpensive cleaning of various surfaces by mixing ice particles, cold water and air. Niechial [9] proposed an ice blasting cleaning system contain-ing an ice crusher, a separator and a blasting gun. Settles [10] suggested produc-ing ice particles of a size range below 100 urn within the apparatus just prior to the nozzle. Although the potential use of ice blasting has been suggested by a number of inventors, the practical use is much more limited. Herb and Vissisouk [11] re-ported precision cleaning of zirconium alloys in the course of production of bi-metallic tubing by ice pellets. It was shown that ice blasting improved the quality of bimetal. The use of air-ice blasting for steel derusting was reported by Liu [12]. The following operational conditions were maintained: air pressure: 0.2-0.76 MPa; grain diameter: below 2.5 mm; ice temperature -50°C; traverse rate 90 mm/min; and standoff distanc e 50 mm. At these conditions the rate of derusting ranged from 290 mm/min at the air pressure of 0.2 MPa to 1110 mm /min at the

2003 ◽  
pp. 146-147
Keyword(s):  
Grain Size ◽  
Melting Temperature ◽  
Cold Water ◽  
Zirconium Alloys ◽  
Surface Cleaning ◽  
Air Pressure ◽  
Operational Conditions ◽  
Ice Particles ◽  
Potential Use

Influence of temperature, composition, and grain size on the tensile failure of water ice: Implications for erosion on Titan

2012 ◽  
Vol 117 (E8) ◽  
pp. n/a-n/a ◽  
Author(s):  
Kimberly L. Litwin ◽  
Beth R. Zygielbaum ◽  
Peter J. Polito ◽  
Leonard S. Sklar ◽  
Geoffrey C. Collins
Keyword(s):  
Grain Size ◽  
Tensile Failure ◽  
Influence Of Temperature ◽  
Water Ice

Investigation of the Formation and the Applications of Ice Powder

2002 ◽  
Author(s):  
D. V. Shishkin ◽  
E. S. Geskin ◽  
B. Goldenberg
Keyword(s):  
Precision Machining ◽  
Water Ice ◽  
Ice Particles ◽  
Waterjet Machining ◽  
Hypothetical Mechanism ◽  
Auto Parts ◽  
Is Integration ◽  
Ice Powder ◽  
Set Up ◽  
Polished Metal

Water ice powder constitutes a potentially important manufacturing tool. Availability and cleanliness of this powder constitute its major advantage. It was shown that the ice particles can be used as an abrasive in the course of waterjet machining. Although the erosion potential of ice particle is inferior to that of the conventional abrasives the environmental soundness of ice enables us to expend the use of the ice abrasive jets on food industry, medicine, precision machining, etc. The principal issue in the use of the ice abrasives is particles formation. Analysis of various technologies showed that the most effective avenue in particles production is integration of the water freezing and ice decomposition. As the results, the desired flow rate of ice particles at the desired temperature and size distribution can be generated. The objective of the presented paper was the experimental investigation of the production of ice particles. An experimental set up was constructed and used for particles fabrication at controlled conditions. The acquired information was applied for the analysis of the phenomena leading to the particles formation. As the result a hypothetical mechanism of the ice decomposition was suggested and validated. The experiments involving the decontamination of the electronic devices, semiconductors, fabric, leather, food products, polished metal, soft plastics, rusted auto parts, etc were carried out in order to demonstrate the potential application of the ice blasting.

scholarly journals The elastic modulus of columnar-grain fresh-water ice

1994 ◽  
Vol 19 ◽  
pp. 13-18 ◽  
Author(s):  
Lorne W. Gold
Keyword(s):  
Grain Size ◽  
Elastic Modulus ◽  
Strain Rate ◽  
Temperature Dependence ◽  
Fresh Water ◽  
Compressive Loading ◽  
Stress And Strain ◽  
Strain Rates ◽  
Water Ice ◽  
Columnar Grain

An analysis is presented of stress and strain measurements made during an investigation of the characteristics of cracks formed in columnar-grain, type S2 fresh-water ice, during uniaxial, compressive loading at the nominal strain rates of 10−3, 10−4 and 10−5s−1, and temperatures of −5°, −10°, −20° and −30°C. The analysis shows that for this range of strain rate and temperature, ice behaves as an anelastic solid. Results are given for the time, grain-size and temperature dependence of the elastic modulus in the plane perpendicular to the long direction of the grains. They are shown to be in reasonable agreement with results of an earlier study of the anelastic behaviour of the same type of ice. It is suggested that the grain-size and temperature dependence of the elastic moduli of ice for this range of strain rate and temperature may be due, in part, to the dependence of the relaxation time on these variables.

scholarly journals The effect of particles on dynamic recrystallization and fabric development of granular ice during creep

2005 ◽  
Vol 51 (174) ◽  
pp. 377-382 ◽  
Author(s):  
Min Song ◽  
Ian Baker ◽  
David M. Cole
Keyword(s):  
Grain Size ◽  
Dynamic Recrystallization ◽  
Mechanical Behavior ◽  
Grain Boundaries ◽  
Microstructural Evolution ◽  
Nucleation Rate ◽  
Random Orientation ◽  
Water Ice ◽  
Average Grain Size ◽  
Prepared Particle

AbstractThe mechanical behavior and microstructural evolution of laboratory-prepared, particle-free fresh-water ice and ice with 1 wt.% (~0.43 vol.%) silt-sized particles were investigated under creep with a stress level of 1.45 MPa at −10°C. The particles were present both within the grains and along the grain boundaries. The creep rates of specimens with particles were always higher than those of particle-free ice. Dynamic recrystallization occurred for both sets of specimens, with new grains nucleating along grain boundaries in the early stages of creep. The ice with particles showed a higher nucleation rate. This resulted in a smaller average grain-size for the ice with particles after a given creep strain. Fabric studies indicated that ice with particles showed a more random orientation of c axes after creep to ~10% strain than the particle-free ice.

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