Flow Near Surface
Flow Near Surface - Related Videos
08:12
Surface Dye Flow Visualization: A Qualitative Method to Observe Streakline Patterns in Supersonic Flow
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2023
Flow visualization around or on a body is an important tool in aerodynamics research. It provides a method to qualitatively and quantitatively study flow structure, and it also helps researchers theorize and verify fluid flow behavior. Flow visualization can be divided into two categories: off-the-surface visualization and surface flow visualization. Off-the-surface flow visualization techniques involve determining the flow characteristics around the body of interest. They include but are not...
03:05
Detection of Vitronectin Binding to Bacterial Surfaces using Flow Cytometry
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2025
This video demonstrates the detection of vitronectin's interaction with bacterial surface proteins. The flow-cytometry analysis measures the fluorescence signal of fluorescently labeled antibodies bound to vitronectin, confirming its presence at the bacterial surface. This technique provides insights into host-pathogen interactions and potential bacterial infection therapies.
08:29
The Submerged Printing of Cells onto a Modified Surface Using a Continuous Flow Microspotter
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Cited by 2 •
2014
This 3D microfluidic printing technology prints arrays of cells onto submerged surfaces. We describe how arrays of cells are delivered microfluidically in 3D flow cells onto submerged surfaces. By printing onto submerged surfaces, cell microarrays were produced that allow for drug screening and cytotoxicity assessment in a multitude of areas.
13:05
Flow Cytometry Protocols for Surface and Intracellular Antigen Analyses of Neural Cell Types
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Cited by 39 •
2014
We provide a detailed description of a protocol for flow cytometric analysis of surface antigens and/or intracellular antigens in neural cell types. Critical aspects of experimental planning, step-by-step methodological procedures, and fundamental principles of flow cytometry are explained in order to enable neurobiologists to exploit this powerful technology.
12:26
Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics
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Cited by 4 •
2013
In this video we first describe fabrication and operation procedures of a surface acoustic wave (SAW) acoustic counterflow device. We then demonstrate an experimental setup that allows for both qualitative flow visualization and quantitative analysis of complex flows within the SAW pumping device.
FAQs
The stationary surface imposes the no-slip condition, so fluid velocity changes from nearly zero at the boundary to the faster motion of the outer flow. This rapid variation across the boundary layer creates a velocity gradient and therefore viscous shear. Examining that gradient helps explain how the surface influences drag and transport.
Viscosity, flow speed, surface texture, and flow regime all influence the layer's thickness and behavior. The regime may be laminar or turbulent, so conditions can alter near-surface patterns. Tracking these variables helps relate local surface effects to the larger flow and anticipate changes in shear, drag, and transport.
The distinction matters because flow regime is one of the factors that determines boundary-layer thickness and behavior. Comparing laminar and turbulent cases can help researchers interpret why velocity gradients, shear, and transport may differ under different conditions, even when the fluid moves alongside a solid surface.
Near-surface layers matter because their thickness and behavior shape transport at the boundary. In particular, studying them helps predict heat transfer and mass transfer, alongside mechanical effects such as drag. This makes the analysis relevant whenever a surface exchanges heat or material with moving fluid.
A useful analysis compares the fluid's velocity near the surface with the faster outer flow, then considers the boundary-layer thickness and resulting shear. It should also account for viscosity, speed, surface texture, and whether the regime is laminar or turbulent. These comparisons connect local motion with system-level performance.
Studying flow near a surface can reveal how boundary effects contribute to drag, heat transfer, mass transfer, and erosion. These outcomes extend beyond the local velocity profile: they provide practical predictions about resistance, exchange between fluid and surface, and material damage. The relevant outcome depends on the system being examined.
The principles apply across systems in which moving fluid interacts with a solid boundary. The overview identifies pipes, aircraft, and microfluidic devices as important examples. In these settings, analyzing the near-surface region can support predictions of performance-related effects, including drag, transport, and erosion.