接触粒子間の接触伝熱に及ぼす表面粗さの影響

桑木賢也, ビン モクタル ムハンマド アリフ, 高見敏弘, 堀尾正靱

伝熱, 表面粗さ, 接触, 粒子, 接触熱抵抗
The objective of this work is to establish a constitution equation of the contact heat transfer between colliding particles for the Discrete Element Method (DEM) simulations.  Since the thermal resistance model is available to estimate the contact heat transfer, the heat transfer between two particles (spheres) was measured by changing surface roughness.  The result of this is that the contact heat transfer increased as surface roughness increased.  This tendency is opposite to a general one in the thermal resistance model.  This would be caused by the geometric condition of the spherical contact plane.  Larger surface roughness yields larger contact area.  This effect would be larger than that of increasing thermal resistance.  Moreover, we tried to directly observe the surface under contact condition by using a laser microscope in order to examine the surface conditions in detail.  The cross-sectional profile of contacting particles was successfully detected.  The macroscopic contact area calculated by considering the surface roughness well agreed with the observed one.

混相流（混相流研究の進展）

日本混相流学会

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