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Related Concept Videos

Measurement of Fluid Pressure01:16

Measurement of Fluid Pressure

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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.
A basic form of manometer is the piezometer, a vertical tube open at the top and filled with the same...
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Pressure of Fluids01:14

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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...
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Thermally controlled microfluidic back pressure regulator.

Karolina Svensson1, Simon Södergren2, Klas Hjort3

  • 1Microsystems Technology Division, Centre of Natural Hazard and Disaster Science (CNDS), Uppsala University, Box 35, 751 03, Uppsala, Sweden. Karolina.svensson@angstrom.uu.se.

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This summary is machine-generated.

This study presents a novel microfluidic back pressure regulator (BPR) for lab-on-a-chip systems. It uses temperature-dependent viscosity for precise pressure control in micro-total-analysis systems.

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Area of Science:

  • Microfluidics
  • Analytical Chemistry
  • Chemical Engineering

Background:

  • Microfluidic systems require precise pressure control for applications like chemical synthesis and analysis.
  • Existing back pressure regulators (BPRs) often involve passive restrictors or external, bulky devices, limiting microfluidic integration.
  • Active BPRs are needed to overcome these limitations and enable advanced microfluidic applications.

Purpose of the Study:

  • To introduce a novel, active microfluidic lab-on-a-chip back pressure regulator (BPR).
  • To demonstrate pressure control in microfluidic systems by leveraging the temperature dependence of fluid viscosity.
  • To integrate a BPR into micro-total-analysis systems for enhanced functionality.

Main Methods:

  • Development of a microfluidic chip with integrated thin-film heaters and thermal sensors.
  • Utilizing a fluid restrictor where flow resistance is modulated by temperature-induced viscosity changes.
  • Performance evaluation using a PID controller to regulate upstream pressure of methanol and water.

Main Results:

  • The developed microfluidic BPR features a minimal dead volume of 3 nL.
  • Achieved thermal actuation with time constants on the order of seconds.
  • Demonstrated reproducible pressure regulation with millibar precision, limited by the pressure sensor.

Conclusions:

  • The novel microfluidic BPR offers a compact and efficient solution for pressure control in microfluidic devices.
  • This technology enables new possibilities for integrated chemical processes and analyses within micro-total-analysis systems.
  • Further characterization of pressure change dynamics, considering upstream volume and liquid compressibility, is presented.