Size dependency of patch departure behavior: evidence from granivorous rodents

ABSTRACTFour kinds of diffusion experiments; (1) through-diffusion (T-D) experiments for diffusion direction dependency to compacted direction, (2) in-diffusion (I-D) experiments for composition dependency of silica sand in bentonite, (3) I-D experiments for initial bentonite grain size dependency, and (4) I-D experiments for the effect of a single fracture developed in bentonite, were carried out using tritiated water (HTO) to evaluate the effect of pore structural factors on diffusion. For (1), effective diffusivities (De) in Na-bentonites, Kunigel-V1Ŵ and Kunipia-FŴ, were measured for densities of 1.0 and 1.5 Mg.m-3 in the axial and perpendicular directions to compacted one. Although De values in Kunigel-V1Ŵ for both directions were similar over the density, De values for perpendicular direction to compacted one in Kunipia-FŴ were higher than those for the same direction as compacted one. For (2), apparent diffusivities (Da) in Kunigel-V1Ŵ with silica sand were measured for densities of 0.8 to 1.8 Mg.m-3. No significant effect of the mixture of silica sand was found. For (3), Da values for densities of 0.8 to 1.8 Mg.m-3 were measured for a granulated Na-bentonite, OT-9607Ŵ. However, no effect of initial bentonite grain size was found. For (4), Da values in Kunigel-V1Ŵ, in which a single fracture was artificially reproduced and immersed in distilled water, were measured. No effect of the fracture on Da was found. Based on this, it may be said that the composition of smectite in bentonite affects the orientation property of clay particle and also affects diffusion. Furthermore, a penetrated fracture formed in bentonite is restored for a short while and does not affect diffusion.

Download Full-text

Numerical study on the boiling heat transfer induced by two heated plates

Thermal Science ◽

10.2298/tsci20s1257s ◽

2020 ◽

Vol 24 (Suppl. 1) ◽

pp. 257-265

Author(s):

Xiaopeng Shan ◽

Geng Guan ◽

Deming Nie

Keyword(s):

Heat Transfer ◽

Boiling Heat Transfer ◽

Numerical Study ◽

Present System ◽

Two Phase ◽

Before And After ◽

Flow Features ◽

Boltzmann Method ◽

Departure Behavior ◽

Heated Plates

A two-phase lattice Boltzmann method was used to numerically study the boiling heat transfer related to the liquid-vapor transition induced by two heated plates. The effects of the gravity force as well as the separation between the heated plates were examined. The focus is on the bubble departure behavior resulting from the interaction between bubbles, which can be roughly classified into four types of pat?tern according to the separation between plates. In particular, it is shown that the bubble merging may take place twice in one cycle when the separation is close to a certain value. This is referred to as the pattern of alternation of bubble merging before and after departure, for which a sudden jump is seen in the bubble release period. Furthermore, the heat flux and the flow features are also shown to illustrate the behavior of heat transfer in the present system.

Download Full-text

Ni content and grain size dependency of perovskite structure La0.8Sr0.2Co1−xNixO3−δ thin films for CO gas sensor

Journal of Vacuum Science & Technology A Vacuum Surfaces and Films ◽

10.1116/1.581638 ◽

1999 ◽

Vol 17 (2) ◽

pp. 630-634 ◽

Cited By ~ 3

Author(s):

C. M. Chiu ◽

Y. H. Chang

Keyword(s):

Thin Films ◽

Grain Size ◽

Gas Sensor ◽

Perovskite Structure ◽

Size Dependency ◽

Ni Content ◽

Co Gas Sensor ◽

Co Gas

Download Full-text

Size and shape dependency of the surface energy of metallic nanoparticles: unifying the atomic and thermodynamic approaches

Physical Chemistry Chemical Physics ◽

10.1039/c8cp02346h ◽

2018 ◽

Vol 20 (31) ◽

pp. 20575-20587 ◽

Cited By ~ 22

Author(s):

Bastiaan Molleman ◽

Tjisse Hiemstra

Keyword(s):

Surface Energy ◽

Metallic Nanoparticles ◽

Size Dependency ◽

Size And Shape ◽

Surface Of Tension

We identify the surface of tension for faceted, metallic nanoparticles, revealing the thermodynamically consistent size dependency of the surface energy.

Download Full-text