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The following paper has been motivated from recent works of Kremer, G.M [1,4], Vardiashvili, G [2], Jantsch, R.C [3], Capozziello, S [5] on Van-Der-WaalsEOS cosmology. The main aim for this paper is to analyze the thermodynamics ofa Non-linear system which in this case is Van-Der-Waals fluid EOS [6]. We haveinvestigated the Van-Der-Waals fluid system with the generalized EOS as [8].The third term signifies viscosity which has been considered as an externalparameter that only modifies pressure but not the density of the liquid. Theand are the two functions of energy density and time that are different for the3 types of Vander Waal models namely one parameter model, two parameters modeland three parameters model [7, 9]. The value of EOS parameter [6, 10] will showdifferent values for different models. We have studied the changes in theparameters for different cosmic phases [4, 5, 6]. We have also studied thethermodynamics and the stability conditions for the three models whileconsidering viscosity [10, 12, 13, 14]. We have discussed the importance ofviscosity [11] for explaining accelerating universe with negative pressure[12]. Finally, we have resolved the finite time future singularity problems[15-20] and discussed the thermodynamics energy conditions [21-31] with thosemodels.

Thermodynamic analysis for Non-linear system (Van-der-Waals EOS) with viscous cosmology