MODELING OF THE THERMO-PHYSICAL PROPERTIES OF AQUEOUS SUCROSE SOLUTIONS II. BOILING POINT, SPECIFIC HEAT CAPACITY AND THERMAL CONDUCTIVITY

Andrei I. SIMION, Cristina G. GRIGORAŞ, Lăcrămioara RUSU, Adriana DABIJA

Abstract

The aim of this study was to establish mathematical relations between temperature or pressure and sucrose concentration with boiling point, specific heat capacity and thermal conductivity of aqueous sucrose solutions. In order to assess and select a suitable mathematical model the known data were fitted in different equations. Two equations were generated for each thermo-physical properties, taking in consideration the level of precision and simplicity of formulation. For boiling point of aqueous sucrose solutions two equations with an average of relative errors of 0.22% and regression coefficients greater than 0.999 were generated, for ranges of 5 – 90% in sucrose concentration and pressure of 0.123.105  – 1.105 Pa. For specific heat capacity two equations were formulated with average relative errors of 0.002% and R2 = 0.9994 for intervals of temperature of 0 to 100 °C and sucrose concentration of 0 to 90% and for thermal conductivity were generated two equation with average relative errors of 0.004% and R2 = 0.9992  for a range of temperature of 0 to 80 °C and sucrose concentration between 0 and 60%. The obtained equations can be loaded in computer software available both for industrial and academic users and so facilitating the sizing and optimization calculations of various technological equipment and processes.

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