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V08_Microfluidic Systems Quiz: Droplets and Diffusion

16 Questions

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V08_Microfluidic Systems Quiz: Droplets and Diffusion

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Questions and Answers

In the context of microfluidic systems, what is the purpose of flow focusing?

Create a uniform flow profile (correct)

Increase droplet size

Reduce fluid viscosity

Enhance plug formation

What effect does the surfactant have on the interface?

Surface tension decreases (correct)

Surface tension increases

Electrical neutral molecules diffuse less easily

Bonding strength of interface molecules increases

What is the significance of Coaxial Injection in the formation of droplets?

Enhances mixing efficiency (correct)

Promotes clogging in microchannels

Reduces droplet production rate

Causes irregular droplet sizes

How does the T-Junction structure contribute to plug formation in microfluidic systems?

Aids in droplet breakup Signup and view all the answers

What is a key advantage of using passive structures in the formation of droplets?

Improves control over droplet size Signup and view all the answers

Which characteristic best describes the diffusion process between droplets highlighted in the text?

Mainly driven by surface tension gradients Signup and view all the answers

What is the impact of increasing the volume flow rate (vcont) on droplet formation through coaxial injection?

Increase in cutting length and number of droplets per time Signup and view all the answers

What kind of flow behavior is observed when the volume flow rate (vcont) is low in coaxial injection?

Dripping Signup and view all the answers

How does an increase in volume flow rate (vcont) affect the number of satellite droplets in coaxial injection?

Increase in the number of satellite droplets Signup and view all the answers

What is the significance of an inclined cover plate in droplet formation?

It increases the number of droplets per time Signup and view all the answers

In the generation of droplets using an inclined cover plate, what happens with an increase in angle alpha (α)?

No volume flow rate of continuous phase needed Signup and view all the answers

How does a high volume flow rate (vcont) affect droplet formation through coaxial injection?

Jetting behavior is observed instead of dripping Signup and view all the answers

What does the Laplace pressure do in the liquid phase when the jet radius decreases?

Increases Signup and view all the answers

What is the relationship between the pressure gradient and the flow inside the jet?

Directly proportional Signup and view all the answers

What happens to a thin jet of liquid when disturbances with wavelengths greater than or equal to 2𝜋𝑅0 occur?

Breaks into droplets Signup and view all the answers

What relationship do Effects 1 and 2 have in terms of competition?

They oppose each other Signup and view all the answers