Effect of Surface Forces on the Gas Flow in Nanosize Capillaries

2005 ◽  
Author(s):  
V. I. Roldughin
Keyword(s):  
Gas Flow ◽  
Surface Forces ◽  
Effect Of Surface

E-08 Effect of Surface Roughness on Friction Factor of Gas Flow in Micro-tubes

2016 ◽  
Vol 2016.69 (0) ◽  
pp. 187-188
Author(s):  
Goku Tanaka ◽  
Chungpyo Hong ◽  
Yutaka Asako ◽  
Hiroshi Katanoda ◽  
Minoru Fukuhara ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Friction Factor ◽  
Gas Flow ◽  
Effect Of Surface

scholarly journals A Numerical Model to Study the Role of Surface Textures at Top Dead Center Reversal in the Piston Ring to Cylinder Liner Contact

2015 ◽  
Vol 138 (2) ◽  
Author(s):  
N. Morris ◽  
R. Rahmani ◽  
H. Rahnejat ◽  
P. D. King ◽  
S. Howell-Smith
Keyword(s):  
Gas Flow ◽  
Fuel Efficiency ◽  
Surface Texturing ◽  
Engine Performance ◽  
Cylinder Liner ◽  
Operating Conditions ◽  
Ic Engine ◽  
Numerical Predictions ◽  
Combined Solution ◽  
Effect Of Surface

Minimization of parasitic losses in the internal combustion (IC) engine is essential for improved fuel efficiency and reduced emissions. Surface texturing has emerged as a method palliating these losses in instances where thin lubricant films lead to mixed or boundary regimes of lubrication. Such thin films are prevalent in contact of compression ring to cylinder liner at piston motion reversals because of momentary cessation of entraining motion. The paper provides combined solution of Reynolds equation, boundary interactions, and a gas flow model to predict the tribological conditions, particularly at piston reversals. This model is then validated against measurements using a floating liner for determination of in situ friction of an engine under motored condition. Very good agreement is obtained. The validated model is then used to ascertain the effect of surface texturing of the liner surface during reversals. Therefore, the paper is a combined study of numerical predictions and the effect of surface texturing. The predictions show that some marginal gains in engine performance can be expected with laser textured chevron features of shallow depth under certain operating conditions.

scholarly journals Effect of Surface Roughness on Rarefied Gas Flow between Two Flat Plates.

1996 ◽  
Vol 62 (596) ◽  
pp. 1307-1312 ◽  
Author(s):  
Wataru SUGIYAMA ◽  
Tadashi SAWADA ◽  
Hiroshi FUNAKI ◽  
Kenji NAKAMORI
Keyword(s):  
Surface Roughness ◽  
Gas Flow ◽  
Rarefied Gas ◽  
Rarefied Gas Flow ◽  
Flat Plates ◽  
Effect Of Surface
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