Fluid Layer
Fluid Layer - Related Videos
09:56
Layer-by-layer Collagen Deposition in Microfluidic Devices for Microtissue Stabilization
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Cited by 7 •
2015
The creation of functional microtissues within microfluidic devices requires the stabilization of cell phenotypes by adapting traditional cell culture techniques to the limited spatial dimensions in microdevices. Modification of collagen allows the layer-by-layer deposition of ultrathin collagen assemblies that can stabilize primary cells, such as hepatocytes, as microfluidic tissue models.
03:07
Thin-Layer Chromatography - Concepts
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2020
Chromatography Chromatography is a technique used in organic chemistry to separate compounds in a mixture based on their differences in solubility between two different phases. The concept is similar to liquid-liquid extraction, except in chromatography, the two phases consist of the stationary phase and the mobile phase. The stationary phase is a solid — typically a microscale hydrogel bead — while the mobile phase is a carrier solvent. In traditional chromatography, the stationary phase is...
14:32
Thin-Layer Chromatography - Student Protocol
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2020
Source: Lara Al Hariri and Ahmed Basabrain at the University of Massachusetts Amherst, MA, USA Effects of Mobile Phase Composition on Compound SeparationExpand In this section of the lab, you will use TLC to compare how well pure hexane and a mixture of 60% hexane and 40% ethyl acetate can separate phenol, benzoic acid, and butyl phenyl ether by measuring the distance the compound traveled in each solvent. Before starting the lab, put on a lab coat, safety glasses, and nitrile gloves.
09:41
Emission Spectroscopic Boundary Layer Investigation during Ablative Material Testing in Plasmatron
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Cited by 2 •
2016
Development of new ablative materials and their numerical modeling requires extensive experimental investigation. This protocol describes procedures for material response characterization in plasma flows with the core techniques being non-intrusive methods to track the material recession along with the chemistry in the reactive boundary layer by emission spectroscopy.
01:21
Layers of the Epidermis
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2025
The epidermis, the outermost layer of the skin, is composed of several distinct layers. From deep to superficial, the layers of the epidermis are as follows: Stratum Basale Stratum basale, also known as the stratum germinativum, is the deepest layer of the epidermis. It is composed of a single layer of actively dividing cells called basal cells or basal keratinocytes. These cells constantly undergo cell division to replenish the upper layers of the epidermis. Additionally, melanocytes, which...
FAQs
These properties determine how momentum moves through the layer and how its flow profile develops. Pressure influences the driving conditions, while viscosity governs resistance to motion. Density affects the layer’s response within the flow, and velocity gradients indicate how rapidly speed changes across it. Together, these variables help predict layer thickness, shear, pressure loss, and transport behavior.
A boundary causes adjacent fluid regions to experience different motion, producing a velocity gradient across the layer. That gradient creates shear, which represents the interaction between neighboring regions as momentum is transferred. Engineering analysis uses this boundary-related behavior to evaluate drag and flow profiles, particularly where a fluid contacts a surface or another flow region.
Transport of momentum, heat, or dissolved species changes conditions across the layer rather than leaving them uniform. As these quantities move, the velocity, temperature, or concentration distribution can evolve, altering the layer thickness and profile. This behavior matters when estimating mixing and transfer rates, because the layer provides a framework for describing how these changes develop.
Engineers should examine pressure, viscosity, density, velocity gradients, boundary interactions, and the transport of momentum, heat, or dissolved species. These factors connect the layer’s local behavior with system-level outcomes such as drag, pressure loss, mixing, and transfer rates. Organizing the analysis around them also supports simplified layer-based models and numerical simulation.
The approach supports the design and analysis of channels, coatings, heat exchangers, lubrication systems, and separation equipment. In each case, engineers can use layer behavior to assess how flow interacts with surfaces or neighboring regions and how transport develops. The resulting predictions help address practical performance measures, including drag, pressure loss, mixing, and transfer rates.
Layer-based models simplify complex flows by representing important regions as distinct layers, making their behavior easier to analyze and simulate numerically. Experimental measurement then provides a way to examine the corresponding layer behavior in a physical system. Together, these approaches help engineers evaluate flow profiles, layer thickness, and transport-related outcomes without treating the entire system as uniformly simple.