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. 2016 Jun 30;7:3. doi: 10.1186/s13362-016-0024-6

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© Moroney et al. 2016

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Phase plane solutions. The phase plane diagrams are given for (a) fine grind parameters $ϵ = 0.028$ , $b_{1} = 5.239$ , $b_{2} = 2.897$ and $γ_{1} = 0.70$ (JK drip filter grind) and (b) coarse grind parameters $ϵ = 0.071$ , $b_{1} = 1.99$ , $b_{2} = 1.35$ and $γ_{1} = 0.5$ (Cimbali #20 grind). Solution trajectories and direction fields are plotted in both cases. The magnitude of the direction field is represented by the size of the blue direction vectors.