November 24, 2019 at 2:42 ammreza65Subscriber
Hi. Could you please clear it below?
For example in a microchannel, we have an inlet and outlet. In a single-phase mode I assume "Velocity inlet" as the condition of the inlet with a velocity of 0.45m/s. However, in the Discrete Phase Model, I choose surface injection and the surface is my the inlet. Now, I want to add "Volume Fraction" of particles as a second-phase. In the injection window, I have to specify the amount of mass flow rate. My question is here, is it correct to use the formula in the attached file?
November 25, 2019 at 6:06 amDrAmineAnsys EmployeeAs ANSYS staff we do not look into attachments.
November 25, 2019 at 6:47 ammreza65Subscriber
I wrote the formula in the attached file because I cannot that here.
I explain my problem statement here in detail.
First, I want to decrease the temperature of a 2-D microchannel with water. Inlet velocity is 0.45m/s, inlet width is 0.2mm, density equates 995.7 kg/m^3.
So, the mass flow rate is equal to 0.45x0.0002*1*995.7 (=0.089613).
Then, I want to inject AL2O3 with a volume fraction of 0.03. I think that I can apply this fraction in Discrete Model in the mass flow rate of injection. Could you help me how can calculate it? I use the following formula;
mass flow rate of particle= (volume fraction x density of particle x mass flow rate of water obtained above) / (density of water)=(0.03*3600*0.089613)/995.7
Is it correct?
Thanks in advance
November 25, 2019 at 2:15 pmRobAnsys Employee
In the injections you'll see a mass flow: that is the mass of DPM material. If you want to inject a certain volume or mass fraction of particles you'll need to do the sums.
If you're interested in a certain volume fraction then work out the inlet (fluid) volume flow rate and then calculate from there.
November 26, 2019 at 3:56 ammreza65Subscriber
February 7, 2020 at 12:45 pmhero55Subscriber
please mreza65 can share me how you calculate total mass flow to get 0.03 volume fraction
and thank you
Any help would be appreciated
February 7, 2020 at 2:37 pmhero55Subscriber
February 7, 2020 at 3:17 pmRobAnsys Employee
Maybe read his post carefully? Volume fraction calculations are explained in most text books.
February 7, 2020 at 8:39 pmhero55Subscriber
sir rwoolhou here I dont understand you (If you want to inject a certain volume or mass fraction of particles you'll need to do the sums. )
what did you mean (you'll need to do the sums) what sums?
and thank you very much.
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