Microgravity Science and Technology

, Volume 29, Issue 4, pp 263–274 | Cite as

Existence Conditions and Formation Process of Second Type of Spiral Loop Particle Accumulation Structure (SL-2 PAS) in Half-zone Liquid Bridge

  • A. Toyama
  • M. Gotoda
  • T. Kaneko
  • I. Ueno
Original Article
Part of the following topical collections:
  1. Advances in gravity-related phenomena in biological, chemical and physical systems


We focus on unique phenomena known as particle accumulation structure (PAS), especially on the conditions of the existence for second-type spiral loop PAS (SL-2 PAS) and on their formation processes under normal gravity. We investigate the existence conditions as functions the aspect ratio of the liquid bridge and the Marangoni number, the intensity of the thermocapillary effect. We discuss the differences among SL-1 PAS, SL-2 PAS and the flow field without PAS through observation of the solid-like structures of the PAS in a rotating frame of reference with the hydrothermal wave, and through monitoring of the surface temperature by infrared camera. We evaluate the formation time of PAS by employing a modified accumulation measure by considering the effect of the particles’ size.


Liquid bridge Particle accumulation structures (PAS) Thermocapillary flow Hydrothermal wave Second-type spiral loop PAS (SL-2 PAS) 



A part of this study was financially supported by the Japan Society for the Promotion of Science (JSPS) through a Grant-in-Aid for Scientific Research (B) (project number 24360078) and Grant-in-Aid for Scientific Research (C) (project number 15K05809)


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Copyright information

© Springer Science+Business Media Dordrecht 2017

Authors and Affiliations

  1. 1.Department of Mechanical Engineering, Faculty of Science & TechnologyTokyo University of ScienceNodaJapan

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