Fig.1

Sketch of two-dimensional shear flow between two plates with roughness elements

Fig.2

Computational domain and mesh distribution

Fig.3

Comparison of velocity and temperature profiles between present results and Ref.［2］

Fig.4

Comparison of velocity profiles and shear stress on surface computed by different meshes

Fig.5

Streamlines and temperature contour for different heights of roughness

Fig.6

Distribution of velocity and temperature at different streamwise locations

Fig.7

Distribution of velocity， temperature， shear stress and heat flux along normal direction

Fig.8

Effect of roughness heights on average velocity near surface

Fig.9

Effect of roughness heights on shear stress

Fig.10

Influence of roughness heights on mass flowrate

Fig.11

Roughness geometry

Fig.12

Distribution of shear stress and heat flux along rough surface

Fig.13

Influence of roughness heights on drag and heat load

Fig.14

Influence of accommodation coefficients on flow field （smooth wall， h=0）

Fig.15

Influence of accommodation coefficients on flow field （roughness wall， h=1.0λ）

Fig.16

Influence of accommodation coefficients on mass flowrate

Fig.17

Influence of accommodation coefficients on drag and heat load

Fig.18

Velocity distributions along normal direction of different channel heights with different accommodation coefficients

Fig.19

Temperature distributions along normal direction of different channel heights with different accommodation coefficients

Table 1

Mean velocity on effective surface of rough wall

Table 2

Mean temperature on effective surface of rough wall

Fig.20

Effect of roughness heights and accommodation coefficients on mean velocity

Fig.21

Effect of roughness heights and accommodation coefficients on shear stress

Fig.22

Effect of roughness heights on drag and heat load with different accommodation coefficients

Fig.23

Effect of accommodation coefficients on drag and heat load at different roughness heights