During the melting phase of phase change materials, the temperature curve usually exhibits a horizontal or near-horizontal line, rather than a continuous upward trend. However, in the experiment, this phase change plateau is absent, and the melting phase is not clearly visible on the temperature curve. Why is that?ally exhibits a horizontal or near-horizontal line, rather than a continuous upward trend. However, in the experiment, this phase change plateau is absent, and the melting phase is not clearly visible on the temperature curve. Why is that?
The 'horisontal' line (i.e. constant temperature during melting) is observed only if you have a well-mixed/homogenous solution, being at the melting point. Most likely, your experiment is adding heat through a liquid phase where T>Tmelt, and to a solid phase where T
Edwin Rodriguez-Ubinas Dear Edwin Rodriguez-Ubinas,
Thank you for your reply. The phase change material I am using is paraffin wax with a phase change temperature of 321.15–325.15 K. The experimental process is as follows: paraffin wax is added to a cubic container, and an electric heating pad is attached to the side of the container for heating, with a heating temperature of 343.15 K. To ensure an adiabatic environment, the other sides are wrapped with thermal insulation material.
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