EFFECT OF TEMPERATURE AND BULK DENSITY ON THERMAL CONDUCTIVITY OF SPRAY-DRIED WHOLE MILK POWDER.

The thermal conductivity of whole milk powder was determined by a steady-state guarded hot-plate method at temperatures ranging from 11. 8 to 43. 2 degree C, at bulk densities 0. 512 and 0. 605 g cm** minus **3. It was found that thermal conductivity increased with increasing temperature and with increasing bulk density. Thermal conductivity increased from 0. 036 w m** minus **1 K** minus **1 at 11. 8 degree C to 0. 077 w m** minus **1 K** minus **1 at 43. 2 degree C for bulk density 0. 512 g cm** minus **3, while for bulk density 0. 605 g cm** minus **3 thermal conductivity increased form 0. 058 w m** minus **1 K** minus **1 at 16. 6 degree C to 0. 093 w m** minus **1 K** minus **1 at 42. 8 degree C.