The Analysis of Secondary Motion and Lubrication Performance of Piston considering the Piston Skirt Profile

Table 3

Characteristic parameters of piston material.

Physical quantity	Piston (eutectic Al Si alloy)	Cylinder liner (boron cast iron)
Thermal conductivity (/W·m^−1·K^−1)	145	42
Density (/kg/m^−3)	2700	7370
Specific heat capacity (/J·kg^−1·K^−1)	880	470
Elasticity modulus (/GPa)	71	159
Poisson ratio	0.34	0.3
Coefficient of linear expansion (α/K^−1)	2 × 10^−6	12 × 10^−6