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Measurement of Fluid Pressure

Measurement of Fluid Pressure

Fluid pressure is commonly measured using devices called manometers, which rely on liquid columns to indicate pressure differences. The height of a liquid column in a manometer reflects the pressure exerted by the fluid, providing a simple yet effective means of measurement. Different types of manometers serve specific purposes based on their configurations and the type of fluids involved.
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Constant Pressure Calorimetry

Constant Pressure Calorimetry

Calorimetry is a technique used to measure the amount of heat involved in a chemical or physical process or to measure the heat transferred to or from a substance. The heat is exchanged with a calibrated and insulated device called the calorimeter. Calorimetry experiments are based on the assumption that there is no heat exchange between the insulated calorimeter and the external environment. The well-insulated calorimeters prevent the transfer of heat between the calorimeter and its external...

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Most pressure gauges, like those on scuba tanks, are calibrated to read zero at atmospheric pressure. Readings from such gauges are called the gauge pressure, which is the pressure relative to atmospheric pressure. When the pressure inside the tank exceeds atmospheric pressure, the gauge reports a positive value. Some gauges are designed to measure negative pressure. For example, many physics experiments must take place in a vacuum chamber, a rigid chamber from which some of the air is pumped...

Pressure of Fluids

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There are many examples of pressure in fluids in everyday life, such as in relation to blood (high or low blood pressure) and in relation to weather (high- and low-pressure weather systems). A given force can have a significantly different effect, depending on the area over which the force is exerted. For instance, a force applied to an area of 1 mm2 has a pressure that is 100 times greater than the same force applied to an area of 1 cm2. That's why a sharp needle is able to poke through skin...

Vapor Pressure of Fluid

Vapor Pressure of Fluid

The vapor pressure of a fluid is a crucial concept in fluid mechanics, influencing phenomena such as boiling and cavitation. Vapor pressure refers to the pressure exerted by a vapor at a state of thermodynamic equilibrium with its corresponding liquid phase at a specific temperature. It represents the tendency of molecules to escape from the fluid surface into the vapor phase.
When a liquid is placed in a closed container with a small air space, and the space is evacuated, vapor molecules will...

Fluid Pressure

Fluid Pressure

In mechanical engineering, fluid pressure plays a critical role in designing systems that utilize liquid flow, such as hydraulic systems, pumps, and valves. When designing these systems, engineers must ensure they can withstand the forces created by fluid pressure to avoid damage or failure.
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Related Experiment Video

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High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions

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A microfluidic vibrating wire viscometer for operation at high pressure and high temperature.

Guillaume Dehestru¹, Marie Leman, Jacques Jundt

¹Schlumberger-Doll Research, 1 Hampshire Street, Cambridge, Massachusetts 02139, USA.

The Review of Scientific Instruments

|April 5, 2011

Summary

This study presents a microfluidic vibrating wire viscometer for precise fluid property measurements. The device achieves ±10% accuracy across a wide temperature and pressure range, ideal for oilfield applications.

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Area of Science:

Fluid dynamics
Instrumental analysis
Materials science

Background:

Accurate viscosity measurements are crucial for oilfield operations.
Existing viscometers may have limitations in terms of sample volume, operating range, or precision.
Microfluidic devices offer potential for miniaturized and efficient fluid analysis.

Purpose of the Study:

To develop and validate a microfluidic vibrating wire viscometer.
To assess the device's accuracy and performance under various conditions.
To investigate the influence of confinement effects on measurements.

Main Methods:

Utilized a microfluidic vibrating wire viscometer with a low internal volume.
Calibrated the instrument using air and toluene.
Tested the viscometer across a temperature range of 10-175 °C and pressure range of 10-24,000 psi.
Evaluated confinement effects by analyzing the ratio of fluid channel width to wire diameter.

Main Results:

Demonstrated accuracy of ±10% for viscosities between 0.1 and 100 cP.
Confirmed suitability for oilfield conditions regarding temperature and pressure.
Identified systematic discrepancies in literature data, suggesting potential for improved interpretation.
Found that confinement effects were not significant despite a low channel-to-wire ratio (6.6).

Conclusions:

The microfluidic vibrating wire viscometer is a viable tool for accurate fluid property determination in demanding environments.
Further research into data interpretation can refine viscosity measurements.
The surprising lack of significant confinement effects warrants further investigation.