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Volume 31, Issue 6
Displaying 1-7 of 7 articles from this issue
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B. H. Lakshmana GOWDA, Shimpei MIZUKI2003 Volume 31 Issue 6 Pages 321-329
Published: June 10, 2003
Released on J-STAGE: July 11, 2011
JOURNAL FREE ACCESSThe generation of secondary flow in several physical situations with particular emphasis in turbomachinery is described. The role of the viscous and pressure gradient effects is stressed. The role of the horseshoe vortex in the evolution and control of the passage vortex are presented.View full abstractDownload PDF (4722K) -
3rd Report: Study on Reduction Method of Vortex GenerationKenichi OKUI, Kiyoshi KAWAGUCHI, Yasutaka KAWABE2003 Volume 31 Issue 6 Pages 330-337
Published: June 10, 2003
Released on J-STAGE: July 11, 2011
JOURNAL FREE ACCESSIn the design of heat exchanger, it is important to reduce the vortex generated from the finned tube banks in forced convection for reduction of noise and vibration. In the past study, we found out that the vortex with specified frequency did not generate in case of two or three rows of finned tubes. So in this paper the reduction method of the vortex generation in the serrated finned tube banks with staggered arrangement by the combination of two or three rows of finned tubes was investigated, in resulting we clarified that the noise was reduced considerably by adopting the counter type arrangement of two rows of finned tubes.View full abstractDownload PDF (963K) -
Static Pressure Profile and Surface Tuft MethodYoichi KINOUE, Toshiaki SETOGUCHI, Mamun Mohammad, Norimasa SHIOMI, Ke ...2003 Volume 31 Issue 6 Pages 338-345
Published: June 10, 2003
Released on J-STAGE: July 11, 2011
JOURNAL FREE ACCESSAn experimental investigation was made into the three-dimensional separated flow and the vortices within the flow separation in a decelerating channel flow generated by the suction from a porous side wall. The time-averaged wall static pressure on the wall parallel to the sucked wall was measured and the flows along the three walls except the sucked wall were visualized by the surface tuft method. Several types of the vortices within the flow separation can be generated by changing the sucked flow rate and providing the inlet flow with velocity gradient. The behaviors of these vortices were examined and discussed in relation to the vortices in the inlet flow.View full abstractDownload PDF (7529K) -
Kazunari HASEGAWA, Ryozo ISHIWATA2003 Volume 31 Issue 6 Pages 346-352
Published: June 10, 2003
Released on J-STAGE: July 11, 2011
JOURNAL FREE ACCESSThe characteristics of apparent mass was made clear from the experiment and the numerical analysis based on assumption of infinitesimal amplitude until now, and the result that experimental values and numerical solutions were mostly agreed was obtained. However, since comparison of the numerical analysis based on assumption of an experiment and finite amplitude was not enough, a quantitatively verification assuming the appropriate finite amplitude was needed. Then numerical analyses of finite amplitude and infinitesimal amplitude were compared with the experiments. From the result of them, the scope of a real phenomenon was shown.View full abstractDownload PDF (930K) -
Correlation Equation on Longitudinal Diffusion Coefficient and Example of ApplicationHideo OHASHI, Takashi YAMADA, Kohzo KOMATSU2003 Volume 31 Issue 6 Pages 353-362
Published: June 10, 2003
Released on J-STAGE: July 11, 2011
JOURNAL FREE ACCESSThis paper presents a correlation equation for estimating longitudinal diffusion coefficient of exhaust gasemitted by vehicles in road tunnels.The equation gives the coefficient for a given amount of traffic and passing Reynolds Number, expressed only by the equivalent resistance area of a vehicle.In addition, this paper shows an example of calculation for two-way traffic tunnel with natural ventilation, as well as the allowable length of tunnel with natural ventilation, concentration distribution and leakage ratio of pollutants at tunnel portals.View full abstractDownload PDF (1161K) -
Keisuke NAKANO, Norihide MAEKAWA, Shuhei NAKAHAMA, Kenichi SUGIYAMA, S ...2003 Volume 31 Issue 6 Pages 363-371
Published: June 10, 2003
Released on J-STAGE: July 11, 2011
JOURNAL FREE ACCESSSlurry wear tests were carried out for base metal SCS6, HP/HVOF thermal spraying DTS-W 110 (1), arc-spraying 56W2C/Ni/Cr and spray fused coating of self-fluxing alloys material 41 WC/Ni/Cr/Co. The slurry jet test apparatus was used for the slurry wear test. The flow velocity was from 10m/s to 40m/s, and the impingement angle was changed from 90 degrees down to 15 degrees. It was found that the volume loss rate of all test materials at 40m/s is almost constant irrespective of impingement angle between 90 and 60 degrees, and decreases with a decreased angle. Coating hardness influences the slurry wear resistance of the thermal spraying. Cavitation erosion tests were carried out for the same materials by slurry wear test and for HP/HVOF thermal sprayings with different compositions. The cavitation erosion test was performed by stationary specimen method based on ASTMG32-98. The cavitation erosion resistance is not affected by material hardness, but is influenced by the density of pores in the material.View full abstractDownload PDF (1076K) -
[in Japanese]2003 Volume 31 Issue 6 Pages 372-377
Published: June 10, 2003
Released on J-STAGE: July 11, 2011
JOURNAL FREE ACCESSDownload PDF (2991K)
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