Device for measuring the heat conductivity or heat capacity of an injectable or non-injectable material

Measuring device for measuring in a transitory manner at least one of the conductivity and the heat capacity of a material, which comprises:

• two heat exchangers with flat walls disposed on opposite sides of a central separation plate having parallel walls sufficiently conductive to be considered isothermal without any fluid passing through said central plate, said flat walls delimiting with said plate two substantially identical chambers;
• heating and cooling means for said heat exchangers;
• two specimens of the material to be studied, of similar thickness, disposed in said chambers respectively between an external surface of the flat wall of the respective heat exchanger and one surface of the central separation plate so as to be traversed by a heat flow;
• means for positioning and holding the heat exchangers substantially parallel to the central plate so as to ensure homogeneous pressure contact between the walls of the heat exchangers, the external surfaces of the specimens, and the surfaces of the central separation plate;
• insulation means closing remaining free edges of said chambers for providing unidirectional heat flow;
• and
• at least two temperature sensors of which one T2, constituted by a thermocouple is integrated into the central separation plate, and of which the other T1, constituted also by a thermocouple is integrated into the external surface of the flat wall of one of the heat exchangers.