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In the present paper, the mechanism of molecular aggregation and the character of potential functionfor square-well model have been investigated with the principle of molecular thermodynamics, leadingto the potential function for double square-well (DSW) model. In addition, the equation of secondvirial coefficient for DSW model is derived from the statistical mechanics method. The above equationobtained has been verified by tests and the test results are excellent. It is concluded that this equationcan well represent the behaviour of fluid molecules.
In the present paper, the mechanism of molecular aggregation and the character of potential function for square-well model have been investigated with the principle of molecular thermodynamics, leadingto the potential function for double square-well (DSW) model. secondvirial coefficient for DSW model is derived from the statistical mechanics method. The above equationobtained has been verified by tests and the test results are excellent. It is that equationcan well represents the behavior of fluid molecules.