how to convert ppm to volume fraction in ansys fluent?

farshads83 · July 3, 2019, 05:48

hello, how can i convert nanofluid( 500ppm) with specified density of nano particle(300kg/m3) and 5 litres of this nanofluid to volume fraction .beacuse in ansys for second phase i need volume fraction. can i change ppm to volume fraction in ansys? if not, how can i convert it?

Svetlana · July 6, 2019, 07:42

Depends on the particle size.

Particle volume fraction

= All particles volume / Volume of the fluid

= One particle volume * number of particles in this volume / Volume of the fluid

= One particle volume * (ppm * Total volume of container / Volume that passes per minute) / Volume of the fluid

= One particle volume * ppm * Total volume of container / (Volume that passes per minute * Volume of the fluid )

= One particle volume * ppm / (Volume that passes per minute)

= (4/3 pi R^3 m^3) * 500 min^-1 / XXX m^3/min

= ... (dimensionless)

You will need the particle size R and your volumetric mass flow rate XXX (converted to a value per minute, or convert the 500 min^-1 to a per-second value by dividing it by 60).

July 3, 2019, 05:48	how to convert ppm to volume fraction in ansys fluent?	#1
farshads83 New Member far Join Date: Jun 2019 Posts: 8 Rep Power: 7	hello, how can i convert nanofluid( 500ppm) with specified density of nano particle(300kg/m3) and 5 litres of this nanofluid to volume fraction .beacuse in ansys for second phase i need volume fraction. can i change ppm to volume fraction in ansys? if not, how can i convert it?

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July 6, 2019, 07:42		#2
Svetlana Senior Member Svetlana Tkachenko Join Date: Oct 2013 Location: Australia, Sydney Posts: 416 Rep Power: 15	Depends on the particle size. Particle volume fraction = All particles volume / Volume of the fluid = One particle volume * number of particles in this volume / Volume of the fluid = One particle volume * (ppm * Total volume of container / Volume that passes per minute) / Volume of the fluid = One particle volume * ppm * Total volume of container / (Volume that passes per minute * Volume of the fluid ) = One particle volume * ppm / (Volume that passes per minute) = (4/3 pi R^3 m^3) * 500 min^-1 / XXX m^3/min = ... (dimensionless) You will need the particle size R and your volumetric mass flow rate XXX (converted to a value per minute, or convert the 500 min^-1 to a per-second value by dividing it by 60).