Nanoscale Interfacial Flow Laboratory

Non-Continuum Flow and Heat Transfer Division

Nanoscale Interfacial Flow Laboratory

Concurrent Professor
Seiji
Samukawa
Associate Professor
Takashi
Tokumasu

There is a domain, i.e. "interface" ,with a clearly different characteristics from the two phases (solid-gas, solid-liquid, and gas-liquid) which are not mutually mixed. The thickness of this interface is several to several tens of nanometers. The flow phenomena in this domain show a unique nature that cannot be explained from a macroscale viewpoint. Moreover, the behavior of the fluid (molecule) in the interface also greatly influences the reaction phenomena of dissociation and reconstitution of molecules produced in the interface. This is why a systematic understanding of the flow phenomena in the interface leads to acquiring a guide to developing materials with novel, miniaturized, and/or advanced features. In this laboratory, we aim at analyzing the flow phenomena that occurs in the interface from a nanoscale point view in the behavior of atoms and molecules, and solving the molecular mechanism of the unique nature of the flow phenomena.

Study of Transport Phenomena of Proton in Polymer Electrolyte Membrane

PEFC generates electric power by transferring proton through nenoscale cluster structure of water in polymer electrolyte membrane. Our aim is to analyze and understand the characteristics of nanoacale flows in large scale simulation using supercomputers, and apply the information to developing and designing polymer electrolyte fuel cells in the next generation.

Study of Transport Phenomena of Water in a Nanoscale Slit Pore

In PEFC water generates during electric power supply. The water droplet is exhausted outside through nanoscale slit pore made of carbon. The phenomena cannot be analyzed by conventional continuum but by molecular analysis water droplet numerically by molecular dynamics method and the characteristics are obtained. The knowledge is effective to develop next generation fuel cell.

Study of Lubrication Phenomena of Nanoscale Liquid Bridge

In lubricated contacts where the film can fractionate into disjointed liquid surface tension at menisci and the wall boundary conditions strongly influence the tribological behavior of the fractionated film and the classical theory of lubrication does not explain load acting on surfaces or friction of liquid bridge. Especially, if the width of liquid is nanometer, interfacial regions cannot be neglected and therefore the characteristics of liquid bridge cannot be analyzed on a macroscopic point of view. Our aim is to investigate the dynamic behavior of liquid bridges by Molecular Dynamics method, and to focus on the nanoscale phenomena occurring in the interfacial regions.

Nanoscale Interfacial Flow Laboratory