Effect of surface roughness of mechanical seals under blood sealing

Jun Tomioka*, Norifumi Miyanaga

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


A miniature mechanical seal with cooling water circulating system has been developed as a shaft seal for rotary blood pumps. The present paper describes the establishment of the experimental methods under blood sealing and the estimation of the effect of the surface roughness on the shaft seal problems, especially in the increase of the friction and the leakage. Micro-leakage rates of the blood and the cooling water were measured by an ion chromatography. In this method, the ion concentration was converted into the leakage rate. The frictional loss torque was measured by a torque meter. Results are provided with three types of surface roughness, Ra = 0.009 μm, Ra = 0.088 μm and Ra = 0.170 μm. It is shown that as the surface roughness increases the leakage decreases while the frictional loss torque increases under blood sealing. The best surface roughness in the torque and the leakage characteristics were different.

Original languageEnglish
Pages (from-to)443-452
Number of pages10
JournalLubrication Science
Issue number10
Publication statusPublished - 2010 Nov


  • blood sealing
  • leakage characteristics
  • mechanical seal
  • rotary blood pumps
  • surface roughness
  • torque characteristics

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Materials Chemistry


Dive into the research topics of 'Effect of surface roughness of mechanical seals under blood sealing'. Together they form a unique fingerprint.

Cite this