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Keywords: fluctuations
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Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Research Papers
J. Fluids Eng. November 2011, 133(11): 111101.
Published Online: October 24, 2011
... and volume of fluid (VOF) model. Results showed that the air part in the reservoir approximated real conditions when using the VOF model. Pressure fluctuations were reduced and a sharp increase of pressure at the inlet of the pump was observed at the beginning of the stopping period. Specific transient...
Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Research Papers
J. Fluids Eng. October 2011, 133(10): 101302.
Published Online: September 26, 2011
... focuses on the general characteristics of a 100kW swirl burner, originally designed for poor quality fuels, in terms of flame characteristic, length and pressure fluctuations, to give a relative measure of the propensity of the system to respond to outside perturbations. Studied effects include swirl...
Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Research Papers
J. Fluids Eng. August 2011, 133(8): 081102.
Published Online: August 16, 2011
... in a centrifugal pump. The resulting fluctuating loads are quantified using numerical computations. For the chosen configuration transient PIV data are available for validation. In addition to measuring the stall frequency in the stationary frame, the CFD data is analyzed in the rotating frame. A Fourier analysis...
Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Research Papers
J. Fluids Eng. June 2011, 133(6): 061101.
Published Online: June 15, 2011
... of 16 ∘ and 35 ∘ , respectively. The frequency spectrum analysis of the resultant unsteady flow has been performed by using fast fourier transform (FFT) approach. The monitoring and analysis system has been employed to measure the fluctuating pressures, cavitation noise...
Journal Articles
Shinji Ebara, Yuta Aoya, Tsukasa Sato, Hidetoshi Hashizume, Yuki Kazuhisa, Kosuke Aizawa, Hidemasa Yamano
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Research Papers
J. Fluids Eng. November 2010, 132(11): 111102.
Published Online: November 18, 2010
... high Reynolds number in the piping. In this study, pressure measurement for a single elbow flow is conducted to elucidate pressure fluctuation characteristics originated from turbulent motion in the elbow, which lead potentially to the FIV. Two different scale models, 1/7- and 1/14-scale simulating...
Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Research Papers
J. Fluids Eng. November 2010, 132(11): 111202.
Published Online: November 9, 2010
...Fabio Gori; Andrea Boghi The present work investigates mass conservation equations in turbulent flow between parallel plates with variable mass diffusivity. Species conservation equations are relative to the average concentration, as well as to the concentration variance. The product of fluctuating...
Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Research Papers
J. Fluids Eng. June 2010, 132(6): 061202.
Published Online: May 19, 2010
..., the mixture fraction fluctuations, the mean velocity, and the Reynolds shear stress. Several versions of the k - ε model are identified that can predict important flow quantities with reasonable accuracy. Some new results are presented for the variation in a mixing function for the mixture normal to the wall...
Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Research Papers
J. Fluids Eng. January 2010, 132(1): 011301.
Published Online: December 15, 2009
... simulation using the finite volume method indicates that the grooves influence the pressure distribution in the whole flow field and induce significant pressure fluctuation. The minimum pressure in each groove occurs on the top of the groove’s “windward” edge and decreases as the groove width is increased...
Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Research Papers
J. Fluids Eng. January 2009, 131(1): 011202.
Published Online: November 26, 2008
... fluctuation for the lower gap size detached cylinder. The higher velocity fluctuation due to the near wall flow structures contributes toward an increase in the near wall mixing of a detached cylinder geometry. Overall, the present study clearly demonstrates the flow structures behind detached ribs, which...
Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Technical Papers
J. Fluids Eng. March 2007, 129(3): 350–358.
Published Online: August 31, 2006
...Xiangyu Qiao; Hironori Horiguchi; Yoshinobu Tsujimoto The response of backflow at the inlet of an inducer to the flow rate fluctuation is studied by using three-dimensional numerical calculations based on the k - ϵ turbulence model for the discussion of its effect on cavitation instabilities...
Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Technical Papers
J. Fluids Eng. September 2006, 128(5): 1063–1073.
Published Online: February 15, 2006
...Tadashi Shiraishi; Hisato Watakabe; Hiromi Sago; Mamoru Konomura; Akira Yamaguchi; Tadashi Fujii For the Japan Atomic Energy Agency sodium-cooled fast reactor, an experimental study on the fluctuating pressure of the hot legs was carried out with tests in a 1/3-scale model. The total resistance...
Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Technical Papers
J. Fluids Eng. July 2005, 127(4): 691–703.
Published Online: April 19, 2005
... eddy viscosity models, applied to these IJS has been made. Good agreement with experimental mean values for the field velocities and Nusselt number was obtained, but velocity fluctuations and local values of Nusselt number along the wall disagree with the experiments in some cases. Experiments show...
Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Technical Papers
J. Fluids Eng. September 2005, 127(5): 978–985.
Published Online: April 7, 2005
... shear layer of the outer jet attached to the surface 3 H to 5 H downstream of the jet exit, and the outside shear layer of the outer jet attaches to the surface further downstream of the jet exit. The distribution and spectra of the fluctuating wall pressure was measured using microphones. The pressure...
Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Technical Papers
J. Fluids Eng. July 2005, 127(4): 714–725.
Published Online: April 7, 2005
.... Statistical analysis shows that cavitation suppresses jet growth and decreases velocity fluctuations within the vaporous regions of the jet. 02 05 2003 07 04 2005 flow simulation vortices cavitation jets bubbles two-phase flow statistical analysis fluctuations Cavitation...
Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Technical Papers
J. Fluids Eng. July 2005, 127(4): 726–733.
Published Online: April 1, 2005
... is decreased in the tunnel, a sheet of cavitation characterized by large amplitude fluctuations is obtained on the foil. The present study focuses on the effects of the foil wall roughness on the cavity unsteady behavior. Four different sizes d of irregularities have been tested, from the smooth surface...
Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Technical Papers
J. Fluids Eng. July 2005, 127(4): 743–751.
Published Online: April 1, 2005
... are smaller compared with other combinations of vane numbers. However, the pressure fluctuations are found to be greater than other cases. Time histories of dynamic fluid forces; Z d = 6 ; experimental uncertainty in K x = ± 1.7 % : ( a ) Effect of rotational speed, ϕ ∕ ϕ...
Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Technical Papers
J. Fluids Eng. September 2004, 126(5): 835–843.
Published Online: December 7, 2004
... and their effects on the wall shear-stress fluctuations. It is shown that very large-scale structures exist in the outer layer and that they certainly contribute to inner layer structures at high Reynolds number. Moreover, it is revealed that very large-scale structures exist even in the wall shear-stress...
Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Technical Papers
J. Fluids Eng. July 2004, 126(4): 539–545.
Published Online: September 10, 2004
... fluctuations were measured by a laser Doppler anemometry (LDA) system. It was found that the maximum liquid velocity in a downward two-phase flow could occur off the pipe centerline at relatively low liquid flow rates and this observation is consistent with other researchers’ results. The comparisons between...
Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Additional Technical Papers
J. Fluids Eng. July 2004, 126(4): 620–625.
Published Online: September 10, 2004
...Z. Gao; F. Mashayek A stochastic model is presented for the prediction of the gravity effects on velocity and temperature fluctuations in turbulent flows laden with solid particles. Both temporal and spatial correlations as well as the anisotropy of turbulence are included in the model. It is found...
Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Technical Papers
J. Fluids Eng. May 2004, 126(3): 316–322.
Published Online: July 12, 2004
...Marko Hocˇevar; Brane Sˇirok; Igor Grabec Turbulent flow field was modeled based on experimental flow visualization and radial-basis neural networks. Turbulent fluctuations were modeled based on the recorded concentration at various locations in the Karman vortex street, which were used as inputs...
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