F. Durst
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View article: An experimental–theoretical framework for reducing scatter in the log-law parameters κ and <i>B</i> of wall-bounded shear flows
An experimental–theoretical framework for reducing scatter in the log-law parameters κ and <i>B</i> of wall-bounded shear flows Open
This paper revisits the classical logarithmic velocity profile of wall-bounded turbulent shear flows, with particular emphasis on the persistent scatter in its defining parameters—the von Kármán constant (κ) and the additive constant (B). …
View article: Cross-validation of numerical and experimental data in turbulent pipe flow with new scaling correlations
Cross-validation of numerical and experimental data in turbulent pipe flow with new scaling correlations Open
The dependence of turbulence statistics and wall friction on Reynolds number in fully developed turbulent pipe flow remains a fundamental subject in fluid mechanics. This paper cross-validates experimental and numerical results, focusing o…
View article: Laminar Pipe Flow Instability: A Theoretical-Experimental Perspective
Laminar Pipe Flow Instability: A Theoretical-Experimental Perspective Open
This paper revisits the theoretically predicted inherent stability of fully developed laminar pipe flow, which remains unconfirmed by experimental evidence. A recently developed theory of pipe-flow stability/instability addresses the gap b…
View article: Shear orientation of nematic phases of clay nanosheets: processing of barrier coatings
Shear orientation of nematic phases of clay nanosheets: processing of barrier coatings Open
When suspensions are exposed to shear forces, the particles may form ordered structures depending on their shapes, concentrations, and the material. For some processes, e.g., for wet-film coating, it is important to know how fast these str…
View article: Permeability and the Ergun Equation as a Basis for Permeability Measurements of Metallic Foams and Wire Meshes
Permeability and the Ergun Equation as a Basis for Permeability Measurements of Metallic Foams and Wire Meshes Open
This paper concerns a method and a test set-up to measure the permeability of plates of metal foams and sets of wire meshes used to control flows in fluid filters and other flow systems designed to yield constant velocity distributions ove…
View article: Treatments of Micro-channel Flows Revisited: Continuum Versus Rarified Gas Considerations
Treatments of Micro-channel Flows Revisited: Continuum Versus Rarified Gas Considerations Open
There are numerous treatments of micro-channel flows available that point out the breakdown of the Navier–Stokes equations under molecular flow conditions when continuum conditions should still apply. The wrong conclusion regarding the val…
View article: Pressure Drop and Flow development in the Entrance Region of Micro-Channels with Second Order Slip Boundary Conditions and the Requirement for Development Length
Pressure Drop and Flow development in the Entrance Region of Micro-Channels with Second Order Slip Boundary Conditions and the Requirement for Development Length Open
In the present investigation, the development of axial velocity profile, the requirement for development length ($L^*_{fd}=L/D_{h}$) and the pressure drop in the entrance region of circular and parallel plate micro-channels have been criti…
View article: A novel spray generator for low-energy oil burners
A novel spray generator for low-energy oil burners Open
Outcomes of development work that resulted in a spray generator which yields spray droplets of small Sauter diameters at very low flow rates through the spray-generating nozzle are reported. This nozzle produces a liquid jet that operates …