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Volume 11, Issue 2
Displaying 1-7 of 7 articles from this issue
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Shin-ichiro Umemura1997 Volume 11 Issue 2 Pages 115-120
Published: June 15, 1997
Released on J-STAGE: February 22, 2011
JOURNAL FREE ACCESSMicrobubbles can grow from nuclei and collapse violently under acoustic pressure. This phenomenon is called acoustic cavitation. The gas in the microbubbles is adiabatically compressed in the violent collapse, and its temperature can reach thousands of degrees. This is regarded as the primary mechanism of sonoluminescence and sonochemical reactions. Research undergoing on the use of acoustic cavitation for inducing therapeutic effects with ultrasound is described in this paper.View full abstractDownload PDF (766K) -
Water Two-Phase Slug Flow in a Vertical PipeTadashi SAKAGUCHI, Takahiro YAMASHITA, Li DANG, Yukio MISUGI1997 Volume 11 Issue 2 Pages 121-130
Published: June 15, 1997
Released on J-STAGE: February 22, 2011
JOURNAL FREE ACCESSFlow behavior of large particle-water two-phase slug flow was observed in a vertical pipe of 30.3mm inside diameter. Large particles with 12.9 and 17.8 mm in mean diameter and density about 2300kg/m3 were used as solid phase. Velocities of solid slug composed of several particles and of solid particles in liquid slug were estimated by proposed correlations of their restricted settling velocities in a pipe. Departure phenomenon of a solid particle from solid slug were also discussed.View full abstractDownload PDF (2887K) -
Measurement of Concentration and Temperature Profiles formed by Double Diffusive Natural Convection Using Optical Fiber SensorShigeru HINATA, Nobuhiro HIMENO, Masayuki SAKURAI, Masayuki IWASA, Kei ...1997 Volume 11 Issue 2 Pages 131-140
Published: June 15, 1997
Released on J-STAGE: February 22, 2011
JOURNAL FREE ACCESSIn this report an experimental study of double diffusive natural convection is performed for a sucrose solution between vertical parallel plates which is heated from one side and cooled from opposite side with an initial condition of a vertically linear concentration gradient. An optical fiber sensor with a thermocouple is used to obtain the vertical distributions of concentration and temperature. The number of multi-layered convection cells changing with the elapsed time from the start of cooling and heating can be counted and the thickness of cells are measured precisely. It is shown that the evolution of layering is a typical example of self-organization in non equilibrium systems. The relationship between the lifetime which is the elapsed time required to become to a vertically uniform concentration and Rayleigh number is obtained. The observation by shadowgraph is also conducted as an auxiliary method.View full abstractDownload PDF (8126K) -
Tomomi UCHIYAMA1997 Volume 11 Issue 2 Pages 141-150
Published: June 15, 1997
Released on J-STAGE: February 22, 2011
JOURNAL FREE ACCESSThis paper presents a finite element method for an incompressible two-fluid model. The solution algorithm is based on the fractional step method, which is frequently used in the finite element calculation for singlephase flows. The calculating domain is divided into quadrilateral elements with four nodes. The Galerkin method is applied to derive the finite element equations. Air-water two-phase flows around a square cylinder are calculated by the finite element method. The calculation demonstrates the close relation between the volumetric fraction of the gas-phase and the vortices shed from the cylinder, which is favorably compared with the existing data. It is also confirmed that the present method allows the calculation with less CPU time than the SMAC finite element method proposed in my previous paper.View full abstractDownload PDF (4551K) -
1. Mechanics of Debris FlowsShinji EGASHIRA1997 Volume 11 Issue 2 Pages 151-156
Published: June 15, 1997
Released on J-STAGE: February 22, 2011
JOURNAL FREE ACCESS -
Definition and CharacterizationYoshiro INOUE1997 Volume 11 Issue 2 Pages 157-162
Published: June 15, 1997
Released on J-STAGE: February 22, 2011
JOURNAL FREE ACCESS -
Foaming Method of Formed In-Place Foaming GasketShirji OKUDA, Masaharu TAKADA, Yasuyuki YOSHIMOTO, Yasuhiro OKURI1997 Volume 11 Issue 2 Pages 163-165
Published: June 15, 1997
Released on J-STAGE: February 22, 2011
JOURNAL FREE ACCESSThe development of a foaming applicator that produces a formed in-place foaming gasket using the pure fluid mechanics system is in progress. This system uses the laminar flow shear function in a pipe to make uniformed small foam via pumping high viscosity liquid-gas two-phase flow under high pressure. The principle, the characteristic, and present state of our foaming applicator are briefly described in this report.View full abstractDownload PDF (4045K)
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