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Keywords: diffusion
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Journal Articles
Article Type: Research Papers
J. Fluids Eng. November 2008, 130(11): 111303.
Published Online: September 23, 2008
... flow field in the blade channels by superposing a 2D cross-sectional vorticity correction to a fully guided axisymmetric flow with radially uniform axial velocity. Suitable redefinition of the diffusion factor for bladings with non-negligible radial flow allows for the control of the blade loading...
Journal Articles
Article Type: Technical Papers
J. Fluids Eng. March 2007, 129(3): 319–324.
Published Online: September 7, 2006
...Min Jun Kim; Kenneth S. Breuer We demonstrate that flagellated bacteria can be utilized in surface arrays (carpets) to achieve mixing in a low-Reynolds number fluidic environment. The mixing performance of the system is quantified by measuring the diffusion of small tracer particles. We show...
Journal Articles
Article Type: Technical Papers
J. Fluids Eng. May 2006, 128(3): 481–487.
Published Online: December 12, 2005
... from the body surfaces. The viscous diffusion of fluid is represented using the core-spreading model to the discrete vortices. The velocity is calculated on the basis of the generalized Biot-Savart law and the pressure field is calculated from an integral, based on the instantaneous velocity...
Journal Articles
Article Type: Technical Papers
J. Fluids Eng. July 2006, 128(4): 699–706.
Published Online: December 6, 2005
... jet and in the vicinity of a Controlled Diffusion airfoil. The present work focuses on the flow conditions corresponding to a Reynolds number based on the airfoil chord length Re c = 1.6 × 10 5 and a geometric angle of attack α g of 8°. Midspan measurements were achieved at the exit plane of the wind...
Journal Articles
Article Type: Technical Briefs
J. Fluids Eng. March 2006, 128(2): 406–409.
Published Online: September 7, 2005
...Sandip Mazumder 30 05 2005 07 09 2005 diffusion computational fluid dynamics iterative methods numerical stability Fourier analysis In order to reduce numerical diffusion associated with first-order upwind differencing schemes (UDS), higher order upwind differencing...
Journal Articles
Article Type: Technical Papers
J. Fluids Eng. March 2006, 128(2): 284–296.
Published Online: August 30, 2005
...Michael Dean Neaves; Jack R. Edwards An algorithm based on the combination of time-derivative preconditioning strategies with low-diffusion upwinding methods is developed and applied to multiphase, compressible flows characteristic of underwater projectile motion. Multiphase compressible flows...
Journal Articles
Article Type: Technical Papers
J. Fluids Eng. November 2005, 127(6): 1154–1160.
Published Online: June 2, 2005
... of the pipe to the axial position where the flow reaches the parabolic velocity profile of the Hagen-Poiseuille flow, a wide range of contradictory data exists. This is shown through a short review of the existing literature. Superimposed diffusion and convection, together with order of magnitude...
Journal Articles
Article Type: Technical Papers
J. Fluids Eng. July 2005, 127(4): 795–805.
Published Online: April 28, 2005
...Ismail Celik; Jun Li; Gusheng Hu; Christian Shaffer The origin of oscillatory convergence in finite difference methods is investigated. Fairly simple implicit schemes are used to solve the steady one-dimensional convection-diffusion equation with variable coefficients, and possible scenarios...
Journal Articles
Article Type: Special Section On Cfd Methods
J. Fluids Eng. July 2005, 127(4): 647–655.
Published Online: April 18, 2005
... volume method,” is explained and a number of examples illustrating the implementation of the method is presented. In this study, the technique is applied for one- and two-dimensional transient heat conduction as well as one- and two-dimensional advection-diffusion problems. Compared to other methods...
Journal Articles
Article Type: Technical Papers
J. Fluids Eng. May 2005, 127(3): 550–553.
Published Online: March 2, 2005
...Tianshu Liu This paper describes optimality principles for the design of an engineering bifurcating-tube tree consisting of the convection and diffusion zones to attain the most effective gas transport. An optimality principle is formulated for the diffusion zone to maximize the total diffusion...
Journal Articles
Article Type: Technical Papers
J. Fluids Eng. May 2005, 127(3): 564–571.
Published Online: March 1, 2005
... ) − 1 , for small and intermediate time In either laminar or turbulent flow, mixing is facilitated if the dispersed fluid elements increase their interfacial area in contact with the bulk fluid, thus allowing diffusion of the tracer into the adjoining bulk fluid. For generality we...
Journal Articles
Article Type: Special Section On Cfd Methods
J. Fluids Eng. July 2005, 127(4): 666–673.
Published Online: February 18, 2005
.... Furthermore, the HPF eddy-viscosity models are formulated locally and three-dimensionally in space. For compressible flows the model is supplemented by a HPF eddy-diffusivity ansatz for the SGS heat flux in the energy equation. Turbulent inflow conditions are generated by a rescaling and recycling technique...
Journal Articles
Article Type: Technical Papers
J. Fluids Eng. September 2004, 126(5): 778–790.
Published Online: December 7, 2004
.... An error transport equation (ETE) is formulated. A generalized source term for the ETE is proposed based on the Taylor series expansion and accessible influence coefficients in the discretized equation. Representative examples, i.e., one-dimensional convection diffusion equation, two-dimensional Poisson...
Journal Articles
Article Type: Technical Papers
J. Fluids Eng. March 2004, 126(2): 180–188.
Published Online: May 3, 2004
...Qi Wang; M. Gregory Forest; Ruhai Zhou The kinetic theory developed in [1] for solutions of nonhomogeneous nematic liquid crystalline polymers (LCPs) of spheroidal molecular configurations is extended to account for the translational diffusion and the related spatial density variation. The new...
Journal Articles
Article Type: Technical Papers
J. Fluids Eng. January 2004, 126(1): 48–54.
Published Online: February 19, 2004
...S. Geoffroy; M. Prat The diffusive and viscous leaks through a model spiral groove static ring gasket are studied analytically. This system is characterized by a transition from a leak through radial passages to a leak following the spiral groove as the load increases. The study concentrates...
Journal Articles
Article Type: Technical Papers
J. Fluids Eng. September 2003, 125(5): 767–778.
Published Online: October 7, 2003
...Hong Wang, Post-Doctoral Research Fellow; Hiroshi Tsukamoto, Professor An experimental and numerical study was developed for the unsteady phenomena at off-design conditions of a diffuser pump. Unsteady pressure measurements were made downstream of the impeller, and the pressure fluctuations were...
Journal Articles
Article Type: Technical Papers
J. Fluids Eng. September 2003, 125(5): 779–785.
Published Online: October 7, 2003
... compressor stage simulation including the impeller and diffuser with three different inlets has been carried out to investigate the influence of each inlet type on the compressor performance. The three different inlet systems included a proposed and improved inlet model. The flow from the bend inlet...
Journal Articles
Article Type: Technical Papers
J. Fluids Eng. May 2003, 125(3): 576–585.
Published Online: June 9, 2003
... concentrations within the stack, and of the mass diffusion within the electrode under inverter loads with frequencies between 30 Hz and 1250 Hz. Contributed by the Fluids Engineering Division for publication in the JOURNAL OF FLUIDS ENGINEERING . Manuscript received by the Fluids Engineering Division...
Journal Articles
Article Type: Technical Briefs
J. Fluids Eng. September 2002, 124(3): 803–806.
Published Online: August 19, 2002
...Vladimir V. Kulish, Assoc. Mem., ASME, Assistant Professor; Jose´ L. Lage, Mem. ASME, Professor In this note we present the application of fractional calculus, or the calculus of arbitrary (noninteger) differentiation, to the solution of time-dependent, viscous-diffusion fluid mechanics problems...
Journal Articles
Article Type: Technical Papers
J. Fluids Eng. March 2002, 124(1): 127–135.
Published Online: October 15, 2001
..., the contribution to the Reynolds shear stress fraction, corresponding to each event, strongly depends on the wall roughness. In the wall region, the diffusion factors are influenced by the wall roughness where the sweep events largely dominate the ejection events. This trend is reversed for the smooth-wall...