Flow Pressure Measurements
Flow Pressure Measurements - Related Videos
08:57
Cross Cylindrical Flow: Measuring Pressure Distribution and Estimating Drag Coefficients
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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.
09:31
Noninvasive Blood Pressure Measurement Techniques
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2023
Source: Hamna J. Qureshi and Craig J. Goergen, Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana Here we will highlight the key similarities and differences of noninvasive blood pressure measurement techniques between humans and rodents and examine the engineering principles that govern blood pressure. The principles that govern current cuff technology to acquire systolic and diastolic pressures will also be discussed. Commercially available cuffs that connect...
10:05
Measuring Turbulent Flows
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2023
Source: Ricardo Mejia-Alvarez and Hussam Hikmat Jabbar, Department of Mechanical Engineering, Michigan State University, East Lansing, MI Turbulent flows exhibit very high frequency fluctuations that require instruments with high time-resolution for their appropriate characterization. Hot-wire anemometers have a short enough time-response to fulfill this requirement. The purpose of this experiment is to demonstrate the use of hot-wire anemometry to characterize a turbulent jet. In this...
08:54
Measuring Blood Pressure in Mice using Volume Pressure Recording, a Tail-cuff Method
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Cited by 175 •
2009
The CODA 8-Channel High Throughput Non-Invasive Blood Pressure system measures the blood pressure in up to 8 mice or rats simultaneously. This tail-cuff system uses Volume Pressure Recording (VPR) to measure the blood pressure by determining the tail blood volume.
03:34
Spatial Measurement of Tumor Interstitial Fluid Pressure: A Method to Measure the Interstitial Fluid Pressure
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2023
This video describes a technique of measuring the interstitial fluid pressure within a tumor by perfusion imaging using an image-guided robotic system. Measurements are compared to the intra-tumoral accumulation of liposomes, within a solid tumor.
FAQs
A pressure gradient provides the driving or opposing force that links a moving fluid to system behavior. Measuring pressure at more than one location reveals whether pressure falls across a conduit or device, and the size of that difference indicates how strongly the system resists transport. This makes gradients useful for evaluating performance rather than recording pressure at one point alone.
Flow pressure measurements can separate changes associated with fluid velocity from those associated with resistance. A measured pressure pattern may change when the fluid moves faster, whereas a larger pressure difference across the same transport path indicates greater opposition to flow. Interpreting both the pressure difference and the relevant system location helps distinguish altered transport conditions from a local performance problem.
Pressure transducers and differential manometers both support pressure assessment, but they convert pressure forces into different types of measurable output. A transducer produces a signal that can support measurement and system evaluation, while a differential manometer indicates a pressure difference between locations. Choosing between them depends on how pressure data must be observed and interpreted in the system.
Unexpected pressure differences or pressure changes across a system can signal a blockage, leak, or other abnormal flow condition. A blockage may appear as increased resistance along part of the transport path, while a leak can alter the expected pressure relationship between locations. Comparing measured values with the intended system behavior helps identify where performance has changed.
A basic workflow begins by selecting relevant locations in the fluid pathway, measuring pressure with a pressure transducer or differential manometer, and comparing the resulting values or pressure differences. The measurements are then interpreted in relation to flow resistance, velocity, and expected performance. This approach supports evaluation of transport behavior without relying on a single pressure reading.
Bioengineering applications include evaluating blood flow, microfluidic devices, perfusion systems, respiratory circuits, and conduits made from biomaterials. In these settings, pressure data can support device design, physiological modeling, and quality control. Measurements also help assess whether transport systems function as intended and can reveal blockages, leaks, or abnormal flow conditions.