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An interesting preprint by Puru Gujrati, "Maxwell's Demon Must RemainSubservient to Clausius' Statement" [ of the Second Law of Thermodynamics ],traces the development and application of Maxwell's Demon. He argues againstthe Demon on thermodynamic grounds. Gujrati introduces and uses his own versionof a generalized thermodynamics in his criticism of the Demon. The complexityof his paper and the lack of any accompanying numerical work piqued ourcuriousity. The internet provides well over two million "hits'' on the subjectof "Maxwell's Demon". There are also hundreds of images of the Demon,superimposed upon a container of gas or liquid. However, there is not so muchalong the lines of simulations of the Demonic process. Accordingly, we thoughtit useful to write and execute relatively simple FORTRAN programs designed toimplement Maxwell's low-density model and to develop its replacement withglobal Nos\'e-Hoover or local purely-Newtonian thermal controls. Thesesimulations illustrate the entropy decreases associated with all three types ofDemons.

Computational Implementation of Maxwell's Knudsen-Gas Demon and Its Extension to a Two-Dimensional Soft-Disk Fluid