THERMAL-CONDUCTIVITY OF SUGAR CRYSTALS AND SUGAR BULKS

The thermal conductivity of ungraded and graded white sugar, cube suga r, powdered sugar, candy sugar and of a sugar crystal assembled from v ery large candy was studied. The effective thermal conductivity of whi te and powdered sugar is chiefly determined by the thermal conductivit y of sucrose and air, and the porosity of the disperse systems. The ef fective thermal conductivity of candy sugar is additionally dependent on the particle size and, with increasing particle size, on the temper ature. Because of the adhesion of the sugar crystals, the effective th ermal conductivity of cube sugar is about 40% greater than that of a w hite sugar pile and declines with the temperature, as in the case of a sugar crystal.