Hydrodynamische Einlauflänge und Widerstandsgesetz von reibungsmindernden kationschen Tensidlösungen

Kleuker, Hans-Heinrich; Laurenzis, A.; Althaus, W.; Steiff, Artur; Weinspach, Paul‐Michael

doi:10.1007/bf02560619

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…Surfactant DRAs field tests have been carried out successfully in large-scale district heating systems and reduced pipe flow energy significantly. The representative applications are Herning, Denmark [31], Volklingen, Germany [32], and Prague, Czech Republic [33]. Surfactants have been tested in district cooling systems at the University of California at Santa Barbara [34] and in Japan.…”

Section: Introductionmentioning

confidence: 99%

Review on Drag Reduction and Its Heat Transfer by Additives

Wang

Zakin

et al. 2011

Advances in Mechanical Engineering

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Since its discovery more than 60 years ago, the drag reduction phenomenon has achieved many notable energy saving effects. These achievements have encouraged researchers to study drag reduction further and further so that it can be utilized better. But due to the complex characteristics of turbulent flow, recent theories cannot explain all the phenomena of drag reduction. To give an overview of drag reduction and corresponding heat transfer for further understanding, this paper summarizes the main advancements of drag reduction during these 60 years, including background, application, development, theory, and research methods of different drag reducers. Future directions of development are also discussed.

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Section: Introductionmentioning

confidence: 99%

Review on Drag Reduction and Its Heat Transfer by Additives

Wang

Zakin

et al. 2011

Advances in Mechanical Engineering

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Stereoscopic Micro-PIV measurement of the flow dynamics in a spherical dimple

Rohwer,

Deponte,

Augustin

et al. 2024

Exp Fluids

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One way to increase the thermal efficiency of heat exchangers is to structure the heat transfer surfaces with dimples, resulting in an enlarged surface area and intensified turbulence in the fluid flow. The increased turbulence also causes higher wall shear stress, which potentially suppresses the deposition of particles and supports a self-cleaning of the surface. For a deeper understanding of these phenomena, the flow dynamics inside the dimple were observed experimentally with Stereoscopic Micro-Particle Image Velocimetry (Stereo µPIV). The formation of an unsteady oscillating vortex, which leads to an asymmetric trail downstream of the dimple, is visualized. The significant influence of the dimple geometry on heat transfer enhancement is shown, and the most beneficial geometric ratio of the spherical dimple regarding its ability to increase turbulence is identified. A comparison of the local flow velocities with the results of the numerically and experimentally observed patterns of the deposited particles caused by the dimple’s self-cleaning effect shows a good match.

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Hydrodynamische Einlauflänge und Widerstandsgesetz von reibungsmindernden kationschen Tensidlösungen

Cited by 2 publications

References 4 publications

Review on Drag Reduction and Its Heat Transfer by Additives

Review on Drag Reduction and Its Heat Transfer by Additives

Stereoscopic Micro-PIV measurement of the flow dynamics in a spherical dimple

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