Microwave Heating of Water, Ice and Saline Solution: Molecular Dynamics Study

Details Microwave Heating of Water, Ice and Saline Solution: Molecular Dynamics Study Microwave Heating of Water, Ice and Saline Solution: Molecular Dynamics Study

2006-07-28

arxiv.org/abs/cond-mat/0607766v2

Physics

Condensed Matter

Materials Science

21 pages, 13 figures

Scientific paper

10.1063/1.2403870

In order to study the heating process of water by the microwaves of 2.5-20GHz frequencies, we have performed molecular dynamics simulations by adopting a non-polarized water model that have fixed point charges on rigid-body molecules. All runs are started from the equilibrated states derived from the I$_{c}$ ice with given density and temperature. In the presence of microwaves, the molecules of liquid water exhibit rotational motion whose average phase is delayed from the microwave electric field. Microwave energy is transferred to the kinetic and inter-molecular energies of water, where one third of the absorbed microwave energy is stored as the latter energy. The water in ice phase is scarcely heated by microwaves because of the tight hydrogen-bonded network of water molecules. Addition of small amount of salt to pure water substantially increases the heating rate because of the weakening by defects in the water network due to sloshing large-size negative ions.

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