Pressure Head-driven Flow
Pressure Head-driven Flow - Related Videos
12:26
Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics
0 Views •
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.
07:26
Synthesis and Microdiffraction at Extreme Pressures and Temperatures
0 Views •
Cited by 5 •
2013
The laser heated diamond anvil cell combined with synchrotron micro-diffraction techniques allows researchers to explore the nature and properties of new phases of matter at extreme pressure and temperature (PT) conditions. Heterogeneous samples can be characterized in situ under high pressure by 2D mapping and combined powder, single-crystal and multigrain diffraction approaches.
08:57
Cross Cylindrical Flow: Measuring Pressure Distribution and Estimating Drag Coefficients
0 Views •
2023
Source: David Guo, College of Engineering, Technology, and Aeronautics (CETA), Southern New Hampshire University (SNHU), Manchester, New Hampshire The pressure distributions and drag estimations for cross cylindrical flow have been investigated for centuries. By ideal inviscid potential flow theory, the pressure distribution around a cylinder is vertically symmetric. The pressure distribution upstream and downstream of the cylinder is also symmetric, which results in a zero-net drag force.
03:01
Generating a Closed-Head Mild Traumatic Brain Injury in a Murine Model
0 Views •
2025
Source: Logsdon, A. F., et al. Low-intensity Blast Wave Model for Preclinical Assessment of Closed-head Mild Traumatic Brain Injury in Rodents. J. Vis. Exp. (2020)This video demonstrates the induction of closed-head mild traumatic brain injury in a mouse model using a pressurized gas shock tube setup. The generated pressure wave ruptures the polyester membrane, delivering a shockwave to the mouse’s head that results in rapid brain movement within the skull, causing a mild traumatic brain injury.
09:58
Light-driven Enzymatic Decarboxylation
0 Views •
Cited by 6 •
2016
We describe a protocol for the light-catalyzed generation of hydrogen peroxide — a cofactor for oxidative transformations.
FAQs
The gradient establishes the direction of transport by comparing head values along a flow path. Fluid moves from the region with higher total head toward the region with lower total head, while resistance limits how much fluid can pass. This distinction is important because a pressure difference supplies the driving force, but the resulting flow also depends on the pathway.
Viscosity and geometry determine the resistance encountered by moving fluid. A more viscous fluid resists motion more strongly, whereas changes in channel dimensions alter how readily fluid can pass. Consequently, the same pressure-head difference can produce different flow rates in different tubes, channels, porous materials, or tissue pathways, making resistance essential for interpreting transport behavior.
Total head provides the comparison used to evaluate the net driving condition along a flow path. Examining only a local pressure value may not describe whether transport proceeds through a channel, porous material, or tubing. Relating the pressure-head gradient to total head helps connect the direction of movement with the resistance that controls the resulting rate.
First, identify the locations between which fluid transport occurs and determine the pressure difference expressed as a fluid-column height. Next, characterize the pathway, including its channel, tubing, or porous structure, and account for viscosity and geometry as sources of resistance. The resulting relationship between driving gradient and resistance can then guide flow interpretation or device design.
In perfusion systems and microfluidic devices, the framework links an imposed pressure-head difference to transport through designed pathways. Engineers can examine how channel geometry and fluid resistance influence the delivered flow, then use that information when developing laboratory models or biomedical devices. This supports controlled movement of fluid through compact systems used for bioengineering studies.
Filtration and tissue transport often require analysis of movement through porous materials rather than open tubing. Pressure head identifies the driving condition, while viscosity and the structure of the pathway influence resistance and flow rate. Applying the same framework helps researchers interpret how pressure differences regulate fluid movement in biological tissues and in filtration-oriented experimental models.