Hydrodynamic characteristics of the helical flow pump

Kohei Ishii, Kyohei Hosoda, Masahiro Nishida, Takashi Isoyama, Itsuro Saito, Koki Ariyoshi, Yusuke Inoue, Toshiya Ono, Hidemoto Nakagawa, Masami Sato, Sintaro Hara, Xinyang Lee, Sheng Yuan Wu, Kou Imachi, Yusuke Abe

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The helical flow pump (HFP) was invented to be an ideal pump for developing the TAH and the helical flow TAH (HFTAH) using two HFPs has been developed. However, since the HFP is quite a new pump, hydrodynamic characteristics inside the pump are not clarified. To analyze hydrodynamic characteristics of the HFP, flow visualization study using the particle image velocimetry and computational fluid dynamics analysis were performed. The experimental and computational models were developed to simulate the left HFP of the HFTAH and distributions of flow velocity vectors, shear stress and pressure inside the pump were examined. In distribution of flow velocity vectors, the vortexes in the vane were observed, which indicated that the HFP has a novel and quite unique working principle in which centrifugal force rotates the fluid in the helical volutes and the fluid is transferred from the inlet to the outlet helical volutes according to the helical structure. In distribution of shear stress, the highest shear stress that was considered to be occurred by the shunt flow across the impeller was found around the entrance of the inlet helical volute. However, it was not so high to cause hemolysis. This shunt flow is thought to be improved by redesigning the inlet and outlet helical volutes. In distribution of pressure, negative pressure was found near the entrance of the inlet helical volute. However, it was not high. Negative pressure is thought to be reduced with an improvement in the design of the impeller or the vane shape.

Original languageEnglish
Pages (from-to)206-212
Number of pages7
JournalJournal of Artificial Organs
Volume18
Issue number3
DOIs
Publication statusPublished - 2015 Sep 4

Keywords

  • Computational fluid dynamics analysis
  • Flow visualization
  • Helical flow pump
  • Rotary blood pump
  • Total artificial heart

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Biomaterials
  • Biomedical Engineering
  • Cardiology and Cardiovascular Medicine

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