What is capillary driven flow?

1. Definition. Capillary-driven flow microfluidics, on the other hand, is a type of microfluidics which works on the principle of capillary action that allows the movement of fluids in capillaries or microchannels without the requirement of external pumping mechanisms.

What is the capillary tube method?

A capillary tube of radius r is immersed vertically to a depth h1 in the liquid of density ρ1 under test. The pressure gρh required to force the meniscus down to the lower end of the capillary and to hold it there is measured.

Is capillary tube a cylinder?

Hint:Capillary tube is a cylindrical tube that forms a meniscus when it is dipped inside the water.

What is capillary microfluidics?

Capillary microfluidic devices use capillary effects (also called capillary action or capillary force) to manipulate liquids. Capillary effects are governed by the interplay between surface tension of a liquid and the geometry and surface chemistry of its solid support.

Why capillary tube is put in a wider tube or a fusion tube?

The adhesive forces are proportional to the diameter of the tube while the gravitational effect due to the liquid’s weight is proportional to the square of the diameter. This results in the greater height of the meniscus for narrower tubes.

What is the size of capillary tube?

A capillary tube is 1–6 m long with an inside diameter generally fro m 0.5–2 mm.

How does capillary rise method work?

Capillary rise is the rise in a liquid above zero pressure level caused by net upward force that is produced by the attraction of water molecules to a solid surface. Capillary rise takes place due to the combined effect of cohesive and adhesive forces that cause liquids to rise up in tubes of very small diameter.

What is capillary tube pressure?

In fluid statics, capillary pressure ( ) is the pressure between two immiscible fluids in a thin tube (see capillary action), resulting from the interactions of forces between the fluids and solid walls of the tube.

What affects capillary pressure?

Capillary pressure and relative permeability vary by (1) the pore surface properties including wettability, end–point saturations, and contact angle, and (2) the net overburden stress affecting the tortuosity, porosity, and interconnectivity of pores.