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Dive into the research topics where Masuhisa Yabuki is active.

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Featured researches published by Masuhisa Yabuki.


Applied Surface Science | 2001

Effects of surface roughness on gas flow conductance in channels estimated by conical roughness model

Wataru Sugiyama; Tadashi Sawada; Masuhisa Yabuki; Y. Chiba

Passages with rough walls allow for smaller conductance for rarefied gas flow than passages with smooth walls. For the purpose of clarifying the effects of surface roughness on rarefied gas flow through channels, surface roughness is modeled by circular cones with the same base radius. The cones are located in a statistical manner consistent with the measured angle distributions of actual surface roughness. Molecules are assumed to scatter on the cone surfaces according to the cosine law. The calculated results predict well the measured reduction of free-molecule and near-free molecule flow conductance through the passages composed of two flat plates.


Abstract of annual meeting of the Surface Science of Japan | 2010

Pumping performance of spiral grooved vacuum pump with surface roughness

Masuhisa Yabuki; Tadashi Sawada; Masashi Iguchi; Tetsuro Ohbayashi; Mitsunori Watanabe


The Proceedings of Autumn Conference of Tohoku Branch | 2009

309 Exhaust characteristics of molecular drag pump with surface roughness

Tomoyasu Akiba; Masuhisa Yabuki; Tadashi Sawada


Transactions of the Japan Society of Mechanical Engineers. B | 2004

Modeling for Actual Surface Roughness at Rarefied Gas Flow between Two Flat Plates

Wataru Sugiyama; Tadashi Sawada; Masuhisa Yabuki


Shinku | 2004

Effects of Surface Roughness and Downstream Pressure of Passages on Rarefied Gas Flows

Wataru Sugiyama; Tadashi Sawada; Masuhisa Yabuki


Shinku | 2004

Effects of Species of Gases and Change in Clearances on the Pumping Performance of a Scroll Vacuum Pump

Shin Kamada; Tadashi Sawada; Wataru Sugiyama; Masuhisa Yabuki; Manabu Fujioka; Masaru Tsuchiya


Shinku | 2003

Study of a Scroll Vacuum Pump

Shin Kamada; Tadashi Sawada; Wataru Sugiyama; Masuhisa Yabuki; Manabu Fujioka; Masaru Tsuchiya


The proceedings of the JSME annual meeting | 2002

Pumping Performance of a Turbo-Molecular Pump Considering the Surface Roughness of the blades

Masuhisa Yabuki; Tadashi Sawada; Wataru Sugiyama; Mitsunori Watanabe


The Proceedings of Conference of Tohoku Branch | 2002

Difference in the Ultimate Pressure of the Dry-Scroll Vacuum Pump with the Species of Gases

Shin Kamada; Tadashi Sawada; Wataru Sugiyama; Masuhisa Yabuki; Manabu Fujioka; Masaru Tuchiya


The Proceedings of Conference of Tohoku Branch | 2001

312 ターボ分子ポンプの排気特性への翼表面粗さの影響(流体工学III)

Masuhisa Yabuki; Tadashi Sawada; Wataru Sugiyama; Saori Harada

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