The Falling Droplet

on November 12, 2013
in CFD

We all have seen the rain drops falling on roof tops or road or car roofs, or water droplets falling from tap. When we usually see these phenomenons occur around us they happen within no time. We don’t even notice them. But if we look closely there are very complex physics involved in them. What if we could really slow down time and observe closely these phenomenon occurring? Like this video from Discovery Channel which shows a slow motion capture of a droplet falling into a liquid surface.

Computational fluid dynamics (CFD) when saw its development on the peak, was meant to merely validate simulations with the experimental results. But the recent trends have shown that confidence in CFD has grown and its use is on the rise to simulate physics problems which have very limited experimental data for its validation. Combustion is one such field where application of CFD and this recent trend has proved to be a boon.

Having the basic introduction to writing a UDF from the earlier article "Writing a UDF for CFD Modeling" wherein we saw using UDF for inserting custom boundary profiles, we shall now see another application of UDF with an example of boiling phenomenon. To get the most understanding from the current article the reader should be familiar with ANSYS Fluent software and basic UDF understanding. 

Carbon Black (CB) is a material produced by the incomplete combustion of heavy petroleum products such as FCC (Fluid Catalytic Cracking) tar, coal tar, ethylene cracking tar, and a small amount of vegetable oil. It is a form of amorphous carbon that has a high surface area to volume ratio majorly used as a pigment and reinforcement in rubber and plastic products. CB is made in specially designed reactors operating at internal temperatures in the range of 2600 F to 3600 F.

Having already gone through the earlier blogs particularly, Multiphase Flow Modeling using CFD  wherein we discussed about multiphase flow physics i.e. What is a multiphase flow? What are its classifications ? and Mathematical Treatments in CFD Modeling of Multiphase Flows where we explained about the different mathematical modeling approaches and differences between them. 

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