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Keywords: convection
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Journal Articles
Article Type: Research Papers
J. Fluids Eng. November 2011, 133(11): 111203.
Published Online: October 27, 2011
... field of the jet forming vortex rings. The rings tilt as they convect downstream before becoming turbulent in the far field. The evolution of vortical structures reveals the presence of a helical structure in the flow field along with the occurrence of vortex pairing. The time-averaged streamwise...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. October 2011, 133(10): 101204.
Published Online: September 27, 2011
... are convected and unified at the end of a splitter plate outfitted with a servo-controlled flapper. The top (cold) stream is dyed with Nigrosine and density is measured optically through the Beer-Lambert law. Quantification of the subtle differences between different initial conditions required the optical...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. June 2011, 133(6): 061203.
Published Online: June 16, 2011
... downstream. In contrast to a developed turbulent flow, the term for turbulent convection in the turbulence kinetic energy balance is significant and can play an important role in some regions of the transitioning boundary layer. More turbulent energy is produced than dissipated and the excess is convected...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. June 2011, 133(6): 061205.
Published Online: June 16, 2011
... and of curvature can be unified by introducing the convective derivative of the rate of strain eigenvectors as their measure. This work was funded in part by the National Science Foundation grant CBET-0965717. References 1 Rodi , W. , and Scheurer , G. , 1983 , “Calculation of Curved...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. February 2011, 133(2): 021101.
Published Online: February 4, 2011
... simulation and the Eulerian approach. The simulation results show that the rotor creates downward and inward flows in behind the rotor paddles, whereas the upward and outward flows are produced in front of the rotor paddles. At a small Strouhal number, convective mixing is very poor. However, the mixing...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. December 2010, 132(12): 121301.
Published Online: December 3, 2010
... turbulence model is employed to close the filtered nonlinear convection terms. The equations are numerically integrated in the context of a generalized curvilinear coordinate system to facilitate geometric complexities. A sixth-order compact finite difference scheme is employed for the Navier–Stokes...
Journal Articles
Article Type: Technical Briefs
J. Fluids Eng. April 2010, 132(4): 044502.
Published Online: April 16, 2010
...O. D. Makinde; P. O. Olanrewaju This study aims to analyze the effects of thermal buoyancy on the laminar boundary layer about a vertical plate in a uniform stream of fluid under a convective surface boundary condition. Using a similarity variable, the governing nonlinear partial differential...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. December 2009, 131(12): 121402.
Published Online: November 30, 2009
... that are numerically stable as understood by an eigenvalue analysis. Finally, the predictive accuracy of the optimized schemes are evaluated using four canonical test problems that involve resolving linear convection, nonlinear Burger wave, turbulence along a flat plate, and circular cylinder wall pressure. Again...
Journal Articles
Article Type: Technical Briefs
J. Fluids Eng. August 2009, 131(8): 084501.
Published Online: July 24, 2009
.... The results of computer simulations showed that oscillation amplitude is the dominant effect on streaming velocity in channel networks. Streaming velocity was directly proportional to the oscillation frequency and can be used as a cost-effective and reliable convective transport means when the particle...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. June 2009, 131(6): 061102.
Published Online: May 14, 2009
.... The simulation also supports the fundamental frequency based on the eddy convection in the mirror shear layer, which is shown to be twice as high as the frequency peak found in the lateral force spectra. In the following text a more thorough examination will be made of the flow field for the case M3SLBCD...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. May 2009, 131(5): 051202.
Published Online: April 14, 2009
... was used on proper orthogonal decomposition filtered data for vortex identification and corresponding vortex centers were tracked to determine convective velocities. The swirl function was also analyzed for its temporal frequency response at several discrete points in both the shear layer...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. January 2009, 131(1): 011204.
Published Online: December 2, 2008
... = 0.2 and 0.41), as a function of freestream velocities of a 2 × 2 m 2 wind tunnel. Convection velocity of instabilities was measured along the shear layer, using velocity cross-correlations. Experiments have shown that in deep cavity for low Mach numbers, oscillations of discrete frequencies can...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. August 2008, 130(8): 081703.
Published Online: August 1, 2008
... this level, buoyancy convection becomes the dominant mechanism. The variation of viscosity plays an important role on the molecular and thermal diffusion. 31 05 2007 20 06 2008 01 08 2008 convection flow through porous media gas mixtures permeability thermal diffusion viscosity...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. June 2008, 130(6): 061103.
Published Online: June 9, 2008
...S. Sarkar The paper describes the flow structures on the suction surface of a highly cambered low-pressure turbine (LPT) blade (T106 profile) subjected to periodic convective wakes. A separation bubble on the rear half of the suction side of the blade was found to form under the operating condition...
Journal Articles
Article Type: Technical Papers
J. Fluids Eng. August 2007, 129(8): 1038–1047.
Published Online: February 3, 2007
... that is enclosed in a cavity of a fluidic oscillator. The geometric configuration of the cavity transforms the inherent stability characteristics of the jet from convective instability to absolute instability, so that the jet precedes the persistent back and forth swinging in the cavity. The swinging jet...
Journal Articles
Article Type: Technical Papers
J. Fluids Eng. August 2007, 129(8): 974–983.
Published Online: January 31, 2007
...Jean-Pierre Franc; Christian Pellone A simple model based on the resolution of Rayleigh equation is used to analyze thermal effects in cavitation. Two different assumptions are considered for the modeling of heat transfer toward the liquid∕vapor interface. One is based upon a convective type...
Journal Articles
Article Type: Technical Papers
J. Fluids Eng. April 2007, 129(4): 506–513.
Published Online: September 28, 2006
...A. K. Dhiman; N. Anjaiah; R. P. Chhabra; V. Eswaran Steady laminar mixed convection flow and heat transfer to Newtonian and power-law fluids from a heated square cylinder has been analyzed numerically. The full momentum and energy equations along with the Boussinesq approximation to simulate...
Journal Articles
Article Type: Technical Papers
J. Fluids Eng. November 2006, 128(6): 1228–1235.
Published Online: March 10, 2006
...B. Xu; X. Ai; B. Q. Li Stabilities of surface-tension-driven convection in an open cylinder are investigated numerically. The cylinder is heated laterally through its sidewall and is cooled at free surface by radiation. A seeding crystal at constant temperature is in contact with the free surface...
Journal Articles
Article Type: Technical Papers
J. Fluids Eng. September 2006, 128(5): 1013–1022.
Published Online: March 3, 2006
...R. N. Mondal; Y. Kaga; T. Hyakutake; S. Yanase Non-isothermal flows with convective heat transfer through a curved duct of square cross section are numerically studied by using a spectral method, and covering a wide range of curvature, δ , 0 < δ ≤ 0.5 and the Dean number, Dn, 0 ≤ Dn ≤ 6000...
Journal Articles
Article Type: Special Section On Rans/Les/Des/Dns: The Future Prospects Of Turbulence Modeling
J. Fluids Eng. September 2005, 127(5): 831–839.
Published Online: September 1, 2005
... are discussed. The potential of very large eddy simulations (VLES) of flows dominated by (pseudo)-deterministic eddy structures, based on transient RANS (T-RANS) and similar approaches, is discussed and illustrated in an example of “ultra-hard” (very high Ra) thermal convection. Navier-Stokes equations flow...