Aspect ratio and capillary ratio dependence of thermal-solutal capillary-buoyancy flow of a binary mixture in an annular pool

Unique character and common behavior are two distinguished things. In frontier nanoscience and nanotechnology, unique characters were normally obtained in some novel exotics materials such as metal-metal core-shell materials, metallic-semiconducting hybrid nanomaterials, and organic-inorganics complex nano-compounds. On the other hand, normal behavior of natural phenomena including in nano-size objects were obviously predicted based on their exact size related to confinement effect, and capability to interact with another physical system in nature. Here, we report an example of unique character due to evolution nonlinear behavior observed in gold nanorod with their aspect-ratio dependence of optical nonlinearities investigated by femtosecond Z-scan measurements closed to resonance longitudinal surface plasmon peak in gold nanorods (Au NRs). Saturable absorption manifests itself at low excitation (laser irradiances < ~7.0 GW/cm2), while reverse saturable absorption dominates at higher excitation. Both the nonlinear processes are found to increase with the aspect ratio of Au NRs. Based on the discrete dipole approximation, qualitative explanations are presented for the observed nonlinear behavior. While common behavior in metallic quantum dots or other shapes of metallic nanomaterials was not the significant in our observation.

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Numerical Simulations of Thermocapillary Flow of a Binary Mixture with the Soret Effect in a Shallow Annular Pool

Microgravity Science and Technology ◽

10.1007/s12217-015-9485-2 ◽

2016 ◽

Vol 28 (1) ◽

pp. 1-10 ◽

Cited By ~ 7

Author(s):

Jia-Jia Yu ◽

Li Zhang ◽

You-Rong Li ◽

Jie-Chao Chen

Keyword(s):

Binary Mixture ◽

Numerical Simulations ◽

Soret Effect ◽

Thermocapillary Flow ◽

Annular Pool

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Aspect Ratio Dependence of Effective Transverse Matrix Resistivity in Multifilamentary HTSC/Ag Strands

Advances in Superconductivity XI ◽

10.1007/978-4-431-66874-9_192 ◽

1999 ◽

pp. 831-834 ◽

Cited By ~ 1

Author(s):

M. D. Sumption ◽

E. W. Collings

Keyword(s):

Aspect Ratio ◽

Ratio Dependence ◽

Matrix Resistivity

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An Experimental Study of Convective Heat Transfer in Radially Rotating Rectangular Ducts

Journal of Heat Transfer ◽

10.1115/1.2910608 ◽

1991 ◽

Vol 113 (3) ◽

pp. 604-611 ◽

Cited By ~ 49

Author(s):

C. Y. Soong ◽

S. T. Lin ◽

G. J. Hwang

Keyword(s):

Heat Transfer ◽

Experimental Study ◽

Reynolds Number ◽

Aspect Ratio ◽

Convective Heat Transfer ◽

Convective Heat ◽

Rotational Speed ◽

Main Flow ◽

Buoyancy Flow ◽

Aspect Ratios

The paper presents an experimental study of convective heat transfer in radially rotating isothermal rectangular ducts with various height and width aspect ratios. The convective heat transfer is affected by secondary flows resulting from Coriolis force and the buoyancy flow, which is in turn due to the centrifugal force in the duct. The growth and strength of the secondary flow depend on the rotational Reynolds number; the effect of the buoyancy flow is characterized by the rotational Rayleigh number. The aspect ratio of the duct may affect the secondary flow and the buoyancy flow, and therefore is also a critical parameter in the heat transfer mechanism. In the present work the effects of the main flow, the rotational speed, and the aspect ratio γ on heat transfer are subjects of major interest. Ducts of aspect ratios γ=5, 2, 1, 0.5, and 0.2 at rotational speed up to 3000 rpm are studied. The main flow Reynolds number ranges from 700 to 20,000 to cover the laminar, transitional, and turbulent flow regimes in the duct flow. Test data and discussion are presented.

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